公司的一个新项目使用ASP.NET MVC开发，经理让我写个OracleHelper，我从网上找了一个比较全的OracleHelper类，缺点是查询的时候返回DataSet，数据增删改要写很多代码(当然，可以用代码生成器，不过配套的代码生成器暂时没有)；又从网上找了一个封装了泛型方法的OracleHelper类，整合到一起，但貌似数据增删改查依然不方便；于是花了两天时间，在原有基础上对增删改查分页查询操作进行了面向对象的封装，并且对批量增删改操作进行事务封装，写事务代码更方便。
原理：
1、利用反射对增删改查进行面向对象的封装
2、事务：如果没有开启事务(没有调用OracleHelper类的BeginTransaction方法)，则按原来的方法创建连接，操作数据库，然后关闭连接；如果开启了事务(调用了OracleHelper类的BeginTransaction方法)，则一次Http请求使用同一个OracleConnection，增删改操作后不关闭连接，先提交事务，事务提交后才关闭连接，下次Http请求再重新创建一个OracleConnection。
说明：
OracleHelper类包含如下功能：
1、基础方法(执行简单SQL语句；执行带参数的SQL语句；存储过程操作；)
2、扩展方法(泛型方法)
3、增删改查(封装了增删改查分页查询操作；查询主表数据时，关联表数据作为主表的类的属性直接查询出来，而不只是关联表数据的ID；添加操作，关联表数据和主表数据要分别添加(使用事务确保一致性)；删除操作，关联表数据和主表数据要分别删除(使用事务确保一致性)；修改操作，如果关联表的是新增的(即ID变了)，要先添加关联表数据，再更新主表数据，如果关联表不是新增的(即ID没变)，则只需要更新主表，方法中会自动更新关联表(关联表如果还有关联表也支持))
4、事务
代码：
OracleHelper.cs：
using System; using System.Collections; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Data.OracleClient; using System.Linq; using System.Reflection; using System.Text; using System.Xml.Linq; using Models; using System.Web; namespace DBUtil { /// <summary> /// Oracle操作类 /// 2014年9月25日 /// 写程序之前，首先引用System.Data.OracleClient /// </summary> public class OracleHelper { #region 变量 /// <summary> /// 数据库连接字符串 /// </summary> public static string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString(); #endregion #region 事务的OracleConnection #region 数据库连接对象 /// <summary> /// 获取打开的数据库连接对象 /// </summary> public static OracleConnection GetOpenConnection() { OracleConnection connection = null; string key = "Simpo_FQD_OracleConnection"; if (HttpContext.Current.Items[key] == null) { connection = new OracleConnection(connectionString); connection.Open(); HttpContext.Current.Items[key] = connection; } else { connection = (OracleConnection)HttpContext.Current.Items[key]; } return connection; } #endregion #region 事务对象 /// <summary> /// 获取事务对象 /// </summary> public static OracleTransaction GetTran() { OracleTransaction tran = null; string key = "Simpo_FQD_OracleTransaction"; if (HttpContext.Current.Items[key] == null) { tran = GetOpenConnection().BeginTransaction(); HttpContext.Current.Items[key] = tran; } else { tran = (OracleTransaction)HttpContext.Current.Items[key]; } return tran; } #endregion #region 开起事务标志 /// <summary> /// 事务标志 /// </summary> private static string tranFlagKey = "Simpo_FQD_OracleTransaction_Flag"; /// <summary> /// 添加事务标志 /// </summary> public static void AddTranFlag() { HttpContext.Current.Items[tranFlagKey] = true; } /// <summary> /// 移除事务标志 /// </summary> public static void RemoveTranFlag() { HttpContext.Current.Items[tranFlagKey] = false; } /// <summary> /// 事务标志 /// </summary> public static bool TranFlag { get { bool tranFlag = false; if (HttpContext.Current.Items[tranFlagKey] != null) { tranFlag = (bool)HttpContext.Current.Items[tranFlagKey]; } return tranFlag; } } #endregion #endregion #region 基础方法 #region 公用方法 #region GetMaxID /// <summary> /// 不支持多用户并发，慎用，请使用GetNextID方法 /// </summary> private static int GetMaxID(string fieldName, string tableName) { string strsql = "select max(" + fieldName + ")+1 from " + tableName; object obj = OracleHelper.GetSingle(strsql); if (obj == null) { return 1; } else { return int.Parse(obj.ToString()); } } #endregion #region Exists public static bool Exists(string strSql, params OracleParameter[] cmdParms) { object obj = OracleHelper.GetSingle(strSql, cmdParms); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } #endregion #endregion #region 执行简单SQL语句 #region Exists public static bool Exists(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(SQLString, connection)) { try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return false; } else { return true; } } catch (System.Data.OracleClient.OracleException e) { connection.Close(); throw new Exception(e.Message); } finally { cmd.Dispose(); connection.Close(); } } } } #endregion #region 执行SQL语句，返回影响的记录数 /// <summary> /// 执行SQL语句，返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString) { OracleConnection connection = GetOpenConnection(); using (OracleCommand cmd = new OracleCommand(SQLString, connection)) { try { if (TranFlag) cmd.Transaction = GetTran(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.OracleClient.OracleException E) { connection.Close(); throw new Exception(E.Message); } finally { cmd.Dispose(); if (!TranFlag) connection.Close(); } } } #endregion #region 执行多条SQL语句，实现数据库事务 /// <summary> /// 执行多条SQL语句，实现数据库事务。 /// </summary> /// <param name="SQLStringList">多条SQL语句</param> public static bool ExecuteSqlTran(ArrayList SQLStringList) { bool re = false; using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); OracleCommand cmd = new OracleCommand(); cmd.Connection = connection; OracleTransaction tx = connection.BeginTransaction(); cmd.Transaction = tx; try { for (int n = 0; n < SQLStringList.Count; n++) { string strsql = SQLStringList[n].ToString(); if (strsql.Trim().Length > 1) { cmd.CommandText = strsql; cmd.ExecuteNonQuery(); } } tx.Commit(); re = true; } catch (System.Data.OracleClient.OracleException E) { re = false; tx.Rollback(); throw new Exception(E.Message); } finally { cmd.Dispose(); connection.Close(); } } return re; } #endregion #region 执行带一个存储过程参数的的SQL语句 /// <summary> /// 执行带一个存储过程参数的的SQL语句。 /// </summary> /// <param name="SQLString">SQL语句</param> /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString, string content) { using (OracleConnection connection = new OracleConnection(connectionString)) { OracleCommand cmd = new OracleCommand(SQLString, connection); System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar); myParameter.Value = content; cmd.Parameters.Add(myParameter); try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.OracleClient.OracleException E) { throw new Exception(E.Message); } finally { cmd.Dispose(); connection.Close(); } } } #endregion #region 向数据库里插入图像格式的字段 /// <summary> /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例) /// </summary> /// <param name="strSQL">SQL语句</param> /// <param name="fs">图像字节,数据库的字段类型为image的情况</param> /// <returns>影响的记录数</returns> public static int ExecuteSqlInsertImg(string strSQL, byte[] fs) { using (OracleConnection connection = new OracleConnection(connectionString)) { OracleCommand cmd = new OracleCommand(strSQL, connection); System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw); myParameter.Value = fs; cmd.Parameters.Add(myParameter); try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.OracleClient.OracleException E) { throw new Exception(E.Message); } finally { cmd.Dispose(); connection.Close(); } } } #endregion #region 执行一条计算查询结果语句，返回查询结果 /// <summary> /// 执行一条计算查询结果语句，返回查询结果（object）。 /// </summary> /// <param name="SQLString">计算查询结果语句</param> /// <returns>查询结果（object）</returns> public static object GetSingle(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(SQLString, connection)) { try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.OracleClient.OracleException e) { connection.Close(); throw new Exception(e.Message); } finally { cmd.Dispose(); connection.Close(); } } } } #endregion #region 执行查询语句，返回OracleDataReader /// <summary> /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="strSQL">查询语句</param> /// <returns>OracleDataReader</returns> public static OracleDataReader ExecuteReader(string strSQL) { OracleConnection connection = new OracleConnection(connectionString); OracleCommand cmd = new OracleCommand(strSQL, connection); try { connection.Open(); OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); return myReader; } catch (System.Data.OracleClient.OracleException e) { throw new Exception(e.Message); } } #endregion #region 执行查询语句，返回DataSet /// <summary> /// 执行查询语句，返回DataSet /// </summary> /// <param name="SQLString">查询语句</param> /// <returns>DataSet</returns> public static DataSet Query(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); OracleDataAdapter command = new OracleDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.OracleClient.OracleException ex) { throw new Exception(ex.Message); } finally { connection.Close(); } return ds; } } #endregion #endregion #region 执行带参数的SQL语句 #region 执行SQL语句，返回影响的记录数 /// <summary> /// 执行SQL语句，返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString, params OracleParameter[] cmdParms) { OracleConnection connection = GetOpenConnection(); using (OracleCommand cmd = new OracleCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); if (TranFlag) cmd.Transaction = GetTran(); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (System.Data.OracleClient.OracleException E) { throw new Exception(E.Message); } finally { cmd.Dispose(); if (!TranFlag) connection.Close(); } } } #endregion #region 执行多条SQL语句，实现数据库事务 /// <summary> /// 执行多条SQL语句，实现数据库事务。 /// </summary> /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param> public static void ExecuteSqlTran(Hashtable SQLStringList) { using (OracleConnection conn = new OracleConnection(connectionString)) { conn.Open(); using (OracleTransaction trans = conn.BeginTransaction()) { OracleCommand cmd = new OracleCommand(); try { //循环 foreach (DictionaryEntry myDE in SQLStringList) { string cmdText = myDE.Key.ToString(); OracleParameter[] cmdParms = (OracleParameter[])myDE.Value; PrepareCommand(cmd, conn, trans, cmdText, cmdParms); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); trans.Commit(); } } catch { trans.Rollback(); throw; } } } } #endregion #region 执行一条计算查询结果语句，返回查询结果 /// <summary> /// 执行一条计算查询结果语句，返回查询结果（object）。 /// </summary> /// <param name="SQLString">计算查询结果语句</param> /// <returns>查询结果（object）</returns> public static object GetSingle(string SQLString, params OracleParameter[] cmdParms) { using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); object obj = cmd.ExecuteScalar(); cmd.Parameters.Clear(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.OracleClient.OracleException e) { throw new Exception(e.Message); } finally { cmd.Dispose(); connection.Close(); } } } } #endregion #region 执行查询语句，返回OracleDataReader /// <summary> /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="strSQL">查询语句</param> /// <returns>OracleDataReader</returns> public static OracleDataReader ExecuteReader(string SQLString, params OracleParameter[] cmdParms) { OracleConnection connection = new OracleConnection(connectionString); OracleCommand cmd = new OracleCommand(); try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return myReader; } catch (System.Data.OracleClient.OracleException e) { throw new Exception(e.Message); } } #endregion #region 执行查询语句，返回DataSet /// <summary> /// 执行查询语句，返回DataSet /// </summary> /// <param name="SQLString">查询语句</param> /// <returns>DataSet</returns> public static DataSet Query(string SQLString, params OracleParameter[] cmdParms) { using (OracleConnection connection = new OracleConnection(connectionString)) { OracleCommand cmd = new OracleCommand(); PrepareCommand(cmd, connection, null, SQLString, cmdParms); using (OracleDataAdapter da = new OracleDataAdapter(cmd)) { DataSet ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (System.Data.OracleClient.OracleException ex) { throw new Exception(ex.Message); } finally { cmd.Dispose(); connection.Close(); } return ds; } } } #endregion #region PrepareCommand private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, string cmdText, OracleParameter[] cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = CommandType.Text;//cmdType; if (cmdParms != null) { foreach (OracleParameter parm in cmdParms) cmd.Parameters.Add(parm); } } #endregion #endregion #region 存储过程操作 #region 执行存储过程 返回SqlDataReader /// <summary> /// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleDataReader</returns> public static OracleDataReader RunProcedureReader(string storedProcName, IDataParameter[] parameters) { OracleConnection connection = new OracleConnection(connectionString); OracleDataReader returnReader; connection.Open(); OracleCommand command = BuildQueryCommand(connection, storedProcName, parameters); command.CommandType = CommandType.StoredProcedure; returnReader = command.ExecuteReader(CommandBehavior.CloseConnection); return returnReader; } #endregion #region 执行存储过程，返回影响的行数 /// <summary> /// 执行存储过程，返回影响的行数 /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <param name="rowsAffected">影响的行数</param> /// <returns></returns> public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected) { using (OracleConnection connection = new OracleConnection(connectionString)) { int result; connection.Open(); OracleCommand command = BuildIntCommand(connection, storedProcName, parameters); rowsAffected = command.ExecuteNonQuery(); result = (int)command.Parameters["ReturnValue"].Value; //Connection.Close(); return result; } } #endregion #region 执行存储过程，什么值也不返回 /// <summary> /// 执行存储过程，什么值也不返回 /// </summary> /// <param name="storedProcName"></param> /// <param name="parameters"></param> public static void RunProcedure(string storedProcName, OracleParameter[] parameters) { using (OracleConnection connection = new OracleConnection(connectionString)) { System.Data.OracleClient.OracleCommand cmd = BuildQueryCommand(connection, storedProcName, parameters); try { if (connection.State != ConnectionState.Open) { connection.Open(); } cmd.ExecuteNonQuery(); } catch (Exception ex) { ex.Message.ToString(); throw new Exception(ex.Message); // Console.WriteLine(ex.Message.ToString()); } finally { connection.Close(); } } } #endregion #region 执行存储过程,返回数据集 /// <summary> /// 执行存储过程,返回数据集 /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <param name="tableName">DataSet结果中的表名</param> /// <returns>DataSet</returns> public static DataSet RunProcedureGetDataSet(string storedProcName, OracleParameter[] parameters) { using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet dataSet = new DataSet(); connection.Open(); OracleDataAdapter sqlDA = new OracleDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters); sqlDA.Fill(dataSet, "dt"); connection.Close(); return dataSet; } } #endregion #region 构建 OracleCommand 对象 /// <summary> /// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值) /// </summary> /// <param name="connection">数据库连接</param> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleCommand</returns> private static OracleCommand BuildQueryCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters) { OracleCommand command = new OracleCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (OracleParameter parameter in parameters) { command.Parameters.Add(parameter); } return command; } #endregion #region 执行存储过程，返回影响的行数 /// <summary> /// 执行存储过程，返回影响的行数 /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <param name="rowsAffected">影响的行数</param> /// <returns></returns> public static int RunProcedure_rowsAffected(string storedProcName, IDataParameter[] parameters, out int rowsAffected) { using (OracleConnection connection = new OracleConnection(connectionString)) { int result; connection.Open(); OracleCommand command = BuildIntCommand(connection, storedProcName, parameters); rowsAffected = command.ExecuteNonQuery(); result = (int)command.Parameters["ReturnValue"].Value; //Connection.Close(); return result; } } #endregion #region 创建 OracleCommand 对象实例 /// <summary> /// 创建 OracleCommand 对象实例(用来返回一个整数值) /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleCommand 对象实例</returns> private static OracleCommand BuildIntCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters) { OracleCommand command = BuildQueryCommand(connection, storedProcName, parameters); command.Parameters.Add(new OracleParameter("ReturnValue", OracleType.Int32, 4, ParameterDirection.ReturnValue, false, 0, 0, string.Empty, DataRowVersion.Default, null)); return command; } #endregion #endregion #endregion #region 扩展方法 #region 执行返回一行一列的数据库操作 /// <summary> /// 执行返回一行一列的数据库操作 /// </summary> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>第一行第一列的记录</returns> public static int ExecuteScalar(string commandText, CommandType commandType, params OracleParameter[] param) { int count = 0; using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { try { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); count = Convert.ToInt32(cmd.ExecuteScalar()); } catch (Exception ex) { count = 0; } } } return count; } #endregion #region 执行不查询的数据库操作 /// <summary> /// 执行不查询的数据库操作 /// </summary> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>受影响的行数</returns> public static int ExecuteNonQuery(string commandText, CommandType commandType, params OracleParameter[] param) { int result = 0; using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { try { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); result = cmd.ExecuteNonQuery(); } catch (Exception ex) { result = 0; } } } return result; } #endregion #region 执行返回一条记录的泛型对象 /// <summary> /// 执行返回一条记录的泛型对象 /// </summary> /// <typeparam name="T">泛型类型</typeparam> /// <param name="reader">只进只读对象</param> /// <returns>泛型对象</returns> private static T ExecuteDataReader<T>(IDataReader reader) { T obj = default(T); try { Type type = typeof(T); obj = (T)Activator.CreateInstance(type);//从当前程序集里面通过反射的方式创建指定类型的对象 //obj = (T)Assembly.Load(OracleHelper._assemblyName).CreateInstance(OracleHelper._assemblyName + "." + type.Name);//从另一个程序集里面通过反射的方式创建指定类型的对象 PropertyInfo[] propertyInfos = type.GetProperties();//获取指定类型里面的所有属性 foreach (PropertyInfo propertyInfo in propertyInfos) { for (int i = 0; i < reader.FieldCount; i++) { string fieldName = reader.GetName(i); if (fieldName.ToLower() == propertyInfo.Name.ToLower()) { object val = reader[propertyInfo.Name];//读取表中某一条记录里面的某一列信息 if (val != null && val != DBNull.Value) propertyInfo.SetValue(obj, val, null);//给对象的某一个属性赋值 break; } } } } catch (Exception ex) { } return obj; } #endregion #region 执行返回一条记录的泛型对象 /// <summary> /// 执行返回一条记录的泛型对象 /// </summary> /// <typeparam name="T">泛型类型</typeparam> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>实体对象</returns> public static T ExecuteEntity<T>(string commandText, CommandType commandType, params OracleParameter[] param) { T obj = default(T); using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); while (reader.Read()) { obj = OracleHelper.ExecuteDataReader<T>(reader); } } } return obj; } #endregion #region 执行返回多条记录的泛型集合对象 /// <summary> /// 执行返回多条记录的泛型集合对象 /// </summary> /// <typeparam name="T">泛型类型</typeparam> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>泛型集合对象</returns> public static List<T> ExecuteList<T>(string commandText, CommandType commandType, params OracleParameter[] param) { List<T> list = new List<T>(); using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { try { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); while (reader.Read()) { T obj = OracleHelper.ExecuteDataReader<T>(reader); list.Add(obj); } } catch (Exception ex) { list = null; } } } return list; } #endregion #endregion #region 增删改查 #region 根据sequence名称获取下一个ID /// <summary> /// 根据sequence名称获取下一个ID /// </summary> public static int GetNextID(string sequenceName) { string sql = string.Format("select {0}.Nextval from dual", sequenceName); DataTable dt = Query(sql).Tables[0]; return int.Parse(dt.Rows[0][0].ToString()); } #endregion #region 添加 /// <summary> /// 添加 /// </summary> public static void Insert(object obj) { StringBuilder strSql = new StringBuilder(); Type type = obj.GetType(); strSql.Append(string.Format("insert into {0}(", type.Name)); PropertyInfo[] propertyInfoList = type.GetProperties(); List<string> propertyNameList = new List<string>(); int savedCount = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object val = propertyInfo.GetValue(obj, null); if (val != null) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } else { object val = propertyInfo.GetValue(obj, null); if (val != null) { propertyNameList.Add(propertyInfo.Name + "Id"); savedCount++; } } } } strSql.Append(string.Format("{0})", string.Join(",", propertyNameList.ToArray()))); strSql.Append(string.Format(" values ({0})", string.Join(",", propertyNameList.ConvertAll<string>(a => ":" + a).ToArray()))); OracleParameter[] parameters = new OracleParameter[savedCount]; int i = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object val = propertyInfo.GetValue(obj, null); if (val != null) { OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name, propertyInfo.GetValue(obj, null)); parameters[i++] = oracleParameter; } } else { object val = propertyInfo.GetValue(obj, null); if (val != null) { object valProVal = val.GetType().GetProperty("Id").GetValue(val, null); OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name + "Id", valProVal); parameters[i++] = oracleParameter; } } } } ExecuteSql(strSql.ToString(), parameters); } #endregion #region 修改 /// <summary> /// 修改 /// </summary> public static void Update(object obj) { object oldObj = Find(obj); if (oldObj == null) throw new Exception("无法获取到旧数据"); StringBuilder strSql = new StringBuilder(); Type type = obj.GetType(); strSql.Append(string.Format("update {0} ", type.Name)); PropertyInfo[] propertyInfoList = type.GetProperties(); List<string> propertyNameList = new List<string>(); int savedCount = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); if (!object.Equals(oldVal, val)) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } else { object val = propertyInfo.GetValue(obj, null); object oldVal = propertyInfo.GetValue(oldObj, null); object oldValProVal = oldVal == null ? null : oldVal.GetType().GetProperty("Id").GetValue(oldVal, null); object valProVal = val == null ? null : val.GetType().GetProperty("Id").GetValue(val, null); if (!object.Equals(oldValProVal, valProVal)) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } } } strSql.Append(string.Format(" set ")); OracleParameter[] parameters = new OracleParameter[savedCount]; int i = 0; StringBuilder sbPros = new StringBuilder(); foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); if (!object.Equals(oldVal, val)) { sbPros.Append(string.Format(" {0}=:{0},", propertyInfo.Name)); OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name, val == null ? DBNull.Value : val); parameters[i++] = oracleParameter; } } else { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); object oldValProVal = oldVal == null ? null : oldVal.GetType().GetProperty("Id").GetValue(oldVal, null); object valProVal = val == null ? null : val.GetType().GetProperty("Id").GetValue(val, null); if (!object.Equals(oldValProVal, valProVal)) { sbPros.Append(string.Format(" {0}=:{0},", propertyInfo.Name + "Id")); OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name + "Id", valProVal == null ? DBNull.Value : valProVal); parameters[i++] = oracleParameter; } } } if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length > 0) { object val = propertyInfo.GetValue(obj, null); if (val != null && Find(val) != null) { Update(val); } } } if (sbPros.Length > 0) { strSql.Append(sbPros.ToString(0, sbPros.Length - 1)); } strSql.Append(string.Format(" where Id={0}", int.Parse(type.GetProperty("Id").GetValue(obj, null).ToString()))); if (savedCount > 0) { ExecuteSql(strSql.ToString(), parameters); } } #endregion #region 删除 /// <summary> /// 根据Id删除 /// </summary> public static void Delete<T>(int id) { Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); sbSql.Append(string.Format("delete from {0} where Id={1}", type.Name, id)); ExecuteSql(sbSql.ToString()); } /// <summary> /// 根据Id集合删除 /// </summary> public static void BatchDelete<T>(string ids) { if (string.IsNullOrWhiteSpace(ids)) return; Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); sbSql.Append(string.Format("delete from {0} where Id in ({1})", type.Name, ids)); ExecuteSql(sbSql.ToString()); } #endregion #region 获取实体 #region 根据实体获取实体 /// <summary> /// 根据实体获取实体 /// </summary> private static object Find(object obj) { Type type = obj.GetType(); object result = Activator.CreateInstance(type); bool hasValue = false; IDataReader rd = null; string sql = string.Format("select * from {0} where Id={1}", type.Name, type.GetProperty("Id").GetValue(obj, null)); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = type.GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { object[] objArray = pro.GetCustomAttributes(typeof(IsEntityAttribute), false); if (objArray.Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return null; } } #endregion #region 根据Id获取实体 /// <summary> /// 根据Id获取实体 /// </summary> private static object FindById(Type type, int id) { object result = Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = false; string sql = string.Format("select * from {0} where Id={1}", type.Name, id); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = type.GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { object[] objArray = pro.GetCustomAttributes(typeof(IsEntityAttribute), false); if (objArray.Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return null; } } #endregion #region 根据Id获取实体 /// <summary> /// 根据Id获取实体 /// </summary> public static T FindById<T>(int id) where T : new() { Type type = typeof(T); T result = (T)Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = false; string sql = string.Format("select * from {0} where Id={1}", type.Name, id); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = type.GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { object[] objArray = pro.GetCustomAttributes(typeof(IsEntityAttribute), false); if (objArray.Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return default(T); } } #endregion #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> public static List<T> FindListBySql<T>(string sql) where T : new() { List<T> list = new List<T>(); object obj; IDataReader rd = null; try { rd = ExecuteReader(sql); if (typeof(T) == typeof(int)) { while (rd.Read()) { list.Add((T)rd[0]); } } else if (typeof(T) == typeof(string)) { while (rd.Read()) { list.Add((T)rd[0]); } } else { PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { IDataRecord record = rd; obj = new T(); foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { if (pro.GetCustomAttributes(typeof(IsEntityAttribute), false).Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(obj, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(obj, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } list.Add((T)obj); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } return list; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <returns></returns> public static PageViewModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage) where T : new() { PageViewModel pageViewModel = new PageViewModel(); using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); string commandText = string.Format("select count(*) from ({0}) T", sql); IDbCommand cmd = new OracleCommand(commandText, connection); pageViewModel.total = int.Parse(cmd.ExecuteScalar().ToString()); int startRow = pageSize * (currentPage - 1); int endRow = startRow + pageSize; StringBuilder sb = new StringBuilder(); sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); List<T> list = FindListBySql<T>(sb.ToString()); pageViewModel.rows = list; } return pageViewModel; } #endregion #region getReaderValue 转换数据 /// <summary> /// 转换数据 /// </summary> private static Object getReaderValue(Object rdValue, Type ptype) { if (ptype == typeof(decimal)) return Convert.ToDecimal(rdValue); if (ptype == typeof(int)) return Convert.ToInt32(rdValue); if (ptype == typeof(long)) return Convert.ToInt64(rdValue); return rdValue; } #endregion #endregion #region 事务 #region 开始事务 /// <summary> /// 开始事务 /// </summary> public static void BeginTransaction() { GetTran(); AddTranFlag(); } #endregion #region 结束事务(正常结束) /// <summary> /// 结束事务(正常结束) /// </summary> public static void EndTransaction() { try { GetTran().Commit(); RemoveTranFlag(); } catch (Exception ex) { GetTran().Rollback(); RemoveTranFlag(); } finally { GetOpenConnection().Close(); } } #endregion #region 回滚事务(出错时调用该方法回滚) /// <summary> /// 回滚事务(出错时调用该方法回滚) /// </summary> public static void RollbackTransaction() { GetTran().Rollback(); RemoveTranFlag(); GetOpenConnection().Close(); } #endregion #endregion } }
OracleHelper.cs(扩展修改版(扩展了几个查询方法；修改了Update方法，原方法要求实体的主键必须是Id，新方法没有此要求，但主键要加上IsId特性))：
using System; using System.Collections; using System.Collections.Generic; using System.Configuration; using System.Data; using System.Data.OracleClient; using System.Linq; using System.Reflection; using System.Text; using System.Xml.Linq; using Models; using System.Web; namespace DBUtil { /// <summary> /// Oracle操作类 /// 2014年9月25日 /// 写程序之前，首先引用System.Data.OracleClient /// </summary> public class OracleHelper { #region 变量 /// <summary> /// 数据库连接字符串 /// </summary> public static string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString(); #endregion #region 事务的OracleConnection #region 数据库连接对象 /// <summary> /// 获取打开的数据库连接对象 /// </summary> public static OracleConnection GetOpenConnection() { OracleConnection connection = null; string key = "Simpo_FQD_OracleConnection"; if (HttpContext.Current.Items[key] == null) { connection = new OracleConnection(connectionString); connection.Open(); HttpContext.Current.Items[key] = connection; } else { connection = (OracleConnection)HttpContext.Current.Items[key]; } return connection; } #endregion #region 事务对象 /// <summary> /// 获取事务对象 /// </summary> public static OracleTransaction GetTran() { OracleTransaction tran = null; string key = "Simpo_FQD_OracleTransaction"; if (HttpContext.Current.Items[key] == null) { tran = GetOpenConnection().BeginTransaction(); HttpContext.Current.Items[key] = tran; } else { tran = (OracleTransaction)HttpContext.Current.Items[key]; } return tran; } #endregion #region 开起事务标志 /// <summary> /// 事务标志 /// </summary> private static string tranFlagKey = "Simpo_FQD_OracleTransaction_Flag"; /// <summary> /// 添加事务标志 /// </summary> public static void AddTranFlag() { HttpContext.Current.Items[tranFlagKey] = true; } /// <summary> /// 移除事务标志 /// </summary> public static void RemoveTranFlag() { HttpContext.Current.Items[tranFlagKey] = false; } /// <summary> /// 事务标志 /// </summary> public static bool TranFlag { get { bool tranFlag = false; if (HttpContext.Current.Items[tranFlagKey] != null) { tranFlag = (bool)HttpContext.Current.Items[tranFlagKey]; } return tranFlag; } } #endregion #endregion #region 基础方法 #region 公用方法 #region GetMaxID /// <summary> /// 不支持多用户并发，慎用，请使用GetNextID方法 /// </summary> private static int GetMaxID(string fieldName, string tableName) { string strsql = "select max(" + fieldName + ")+1 from " + tableName; object obj = OracleHelper.GetSingle(strsql); if (obj == null) { return 1; } else { return int.Parse(obj.ToString()); } } #endregion #region Exists public static bool Exists(string strSql, params OracleParameter[] cmdParms) { object obj = OracleHelper.GetSingle(strSql, cmdParms); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } #endregion #endregion #region 执行简单SQL语句 #region Exists public static bool Exists(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(SQLString, connection)) { try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return false; } else { return true; } } catch (System.Data.OracleClient.OracleException e) { connection.Close(); throw new Exception(e.Message); } finally { cmd.Dispose(); connection.Close(); } } } } #endregion #region 执行SQL语句，返回影响的记录数 /// <summary> /// 执行SQL语句，返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString) { OracleConnection connection = GetOpenConnection(); using (OracleCommand cmd = new OracleCommand(SQLString, connection)) { try { if (TranFlag) cmd.Transaction = GetTran(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.OracleClient.OracleException E) { connection.Close(); throw new Exception(E.Message); } finally { cmd.Dispose(); if (!TranFlag) connection.Close(); } } } #endregion #region 执行多条SQL语句，实现数据库事务 /// <summary> /// 执行多条SQL语句，实现数据库事务。 /// </summary> /// <param name="SQLStringList">多条SQL语句</param> public static bool ExecuteSqlTran(ArrayList SQLStringList) { bool re = false; using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); OracleCommand cmd = new OracleCommand(); cmd.Connection = connection; OracleTransaction tx = connection.BeginTransaction(); cmd.Transaction = tx; try { for (int n = 0; n < SQLStringList.Count; n++) { string strsql = SQLStringList[n].ToString(); if (strsql.Trim().Length > 1) { cmd.CommandText = strsql; cmd.ExecuteNonQuery(); } } tx.Commit(); re = true; } catch (System.Data.OracleClient.OracleException E) { re = false; tx.Rollback(); throw new Exception(E.Message); } finally { cmd.Dispose(); connection.Close(); } } return re; } #endregion #region 执行带一个存储过程参数的的SQL语句 /// <summary> /// 执行带一个存储过程参数的的SQL语句。 /// </summary> /// <param name="SQLString">SQL语句</param> /// <param name="content">参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString, string content) { using (OracleConnection connection = new OracleConnection(connectionString)) { OracleCommand cmd = new OracleCommand(SQLString, connection); System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@content", OracleType.NVarChar); myParameter.Value = content; cmd.Parameters.Add(myParameter); try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.OracleClient.OracleException E) { throw new Exception(E.Message); } finally { cmd.Dispose(); connection.Close(); } } } #endregion #region 向数据库里插入图像格式的字段 /// <summary> /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例) /// </summary> /// <param name="strSQL">SQL语句</param> /// <param name="fs">图像字节,数据库的字段类型为image的情况</param> /// <returns>影响的记录数</returns> public static int ExecuteSqlInsertImg(string strSQL, byte[] fs) { using (OracleConnection connection = new OracleConnection(connectionString)) { OracleCommand cmd = new OracleCommand(strSQL, connection); System.Data.OracleClient.OracleParameter myParameter = new System.Data.OracleClient.OracleParameter("@fs", OracleType.LongRaw); myParameter.Value = fs; cmd.Parameters.Add(myParameter); try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.OracleClient.OracleException E) { throw new Exception(E.Message); } finally { cmd.Dispose(); connection.Close(); } } } #endregion #region 执行一条计算查询结果语句，返回查询结果 /// <summary> /// 执行一条计算查询结果语句，返回查询结果（object）。 /// </summary> /// <param name="SQLString">计算查询结果语句</param> /// <returns>查询结果（object）</returns> public static object GetSingle(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(SQLString, connection)) { try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.OracleClient.OracleException e) { connection.Close(); throw new Exception(e.Message); } finally { cmd.Dispose(); connection.Close(); } } } } #endregion #region 执行查询语句，返回OracleDataReader /// <summary> /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="strSQL">查询语句</param> /// <returns>OracleDataReader</returns> public static OracleDataReader ExecuteReader(string strSQL) { OracleConnection connection = new OracleConnection(connectionString); OracleCommand cmd = new OracleCommand(strSQL, connection); try { connection.Open(); OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); return myReader; } catch (System.Data.OracleClient.OracleException e) { throw new Exception(e.Message); } } #endregion #region 执行查询语句，返回DataSet /// <summary> /// 执行查询语句，返回DataSet /// </summary> /// <param name="SQLString">查询语句</param> /// <returns>DataSet</returns> public static DataSet Query(string SQLString) { using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); OracleDataAdapter command = new OracleDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.OracleClient.OracleException ex) { throw new Exception(ex.Message); } finally { connection.Close(); } return ds; } } #endregion #endregion #region 执行带参数的SQL语句 #region 执行SQL语句，返回影响的记录数 /// <summary> /// 执行SQL语句，返回影响的记录数 /// </summary> /// <param name="SQLString">SQL语句</param> /// <returns>影响的记录数</returns> public static int ExecuteSql(string SQLString, params OracleParameter[] cmdParms) { OracleConnection connection = GetOpenConnection(); using (OracleCommand cmd = new OracleCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); if (TranFlag) cmd.Transaction = GetTran(); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (System.Data.OracleClient.OracleException E) { throw new Exception(E.Message); } finally { cmd.Dispose(); if (!TranFlag) connection.Close(); } } } #endregion #region 执行多条SQL语句，实现数据库事务 /// <summary> /// 执行多条SQL语句，实现数据库事务。 /// </summary> /// <param name="SQLStringList">SQL语句的哈希表（key为sql语句，value是该语句的OracleParameter[]）</param> public static void ExecuteSqlTran(Hashtable SQLStringList) { using (OracleConnection conn = new OracleConnection(connectionString)) { conn.Open(); using (OracleTransaction trans = conn.BeginTransaction()) { OracleCommand cmd = new OracleCommand(); try { //循环 foreach (DictionaryEntry myDE in SQLStringList) { string cmdText = myDE.Key.ToString(); OracleParameter[] cmdParms = (OracleParameter[])myDE.Value; PrepareCommand(cmd, conn, trans, cmdText, cmdParms); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); trans.Commit(); } } catch { trans.Rollback(); throw; } } } } #endregion #region 执行一条计算查询结果语句，返回查询结果 /// <summary> /// 执行一条计算查询结果语句，返回查询结果（object）。 /// </summary> /// <param name="SQLString">计算查询结果语句</param> /// <returns>查询结果（object）</returns> public static object GetSingle(string SQLString, params OracleParameter[] cmdParms) { using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); object obj = cmd.ExecuteScalar(); cmd.Parameters.Clear(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.OracleClient.OracleException e) { throw new Exception(e.Message); } finally { cmd.Dispose(); connection.Close(); } } } } #endregion #region 执行查询语句，返回OracleDataReader /// <summary> /// 执行查询语句，返回OracleDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="strSQL">查询语句</param> /// <returns>OracleDataReader</returns> public static OracleDataReader ExecuteReader(string SQLString, params OracleParameter[] cmdParms) { OracleConnection connection = new OracleConnection(connectionString); OracleCommand cmd = new OracleCommand(); try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); OracleDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return myReader; } catch (System.Data.OracleClient.OracleException e) { throw new Exception(e.Message); } } #endregion #region 执行查询语句，返回DataSet /// <summary> /// 执行查询语句，返回DataSet /// </summary> /// <param name="SQLString">查询语句</param> /// <returns>DataSet</returns> public static DataSet Query(string SQLString, params OracleParameter[] cmdParms) { using (OracleConnection connection = new OracleConnection(connectionString)) { OracleCommand cmd = new OracleCommand(); PrepareCommand(cmd, connection, null, SQLString, cmdParms); using (OracleDataAdapter da = new OracleDataAdapter(cmd)) { DataSet ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (System.Data.OracleClient.OracleException ex) { throw new Exception(ex.Message); } finally { cmd.Dispose(); connection.Close(); } return ds; } } } #endregion #region PrepareCommand private static void PrepareCommand(OracleCommand cmd, OracleConnection conn, OracleTransaction trans, string cmdText, OracleParameter[] cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = CommandType.Text;//cmdType; if (cmdParms != null) { foreach (OracleParameter parm in cmdParms) cmd.Parameters.Add(parm); } } #endregion #endregion #region 存储过程操作 #region 执行存储过程 返回SqlDataReader /// <summary> /// 执行存储过程 返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleDataReader</returns> public static OracleDataReader RunProcedureReader(string storedProcName, IDataParameter[] parameters) { OracleConnection connection = new OracleConnection(connectionString); OracleDataReader returnReader; connection.Open(); OracleCommand command = BuildQueryCommand(connection, storedProcName, parameters); command.CommandType = CommandType.StoredProcedure; returnReader = command.ExecuteReader(CommandBehavior.CloseConnection); return returnReader; } #endregion #region 执行存储过程，返回影响的行数 /// <summary> /// 执行存储过程，返回影响的行数 /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <param name="rowsAffected">影响的行数</param> /// <returns></returns> public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected) { using (OracleConnection connection = new OracleConnection(connectionString)) { int result; connection.Open(); OracleCommand command = BuildIntCommand(connection, storedProcName, parameters); rowsAffected = command.ExecuteNonQuery(); result = (int)command.Parameters["ReturnValue"].Value; //Connection.Close(); return result; } } #endregion #region 执行存储过程，什么值也不返回 /// <summary> /// 执行存储过程，什么值也不返回 /// </summary> /// <param name="storedProcName"></param> /// <param name="parameters"></param> public static void RunProcedure(string storedProcName, OracleParameter[] parameters) { using (OracleConnection connection = new OracleConnection(connectionString)) { System.Data.OracleClient.OracleCommand cmd = BuildQueryCommand(connection, storedProcName, parameters); try { if (connection.State != ConnectionState.Open) { connection.Open(); } cmd.ExecuteNonQuery(); } catch (Exception ex) { ex.Message.ToString(); throw new Exception(ex.Message); // Console.WriteLine(ex.Message.ToString()); } finally { connection.Close(); } } } #endregion #region 执行存储过程,返回数据集 /// <summary> /// 执行存储过程,返回数据集 /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <param name="tableName">DataSet结果中的表名</param> /// <returns>DataSet</returns> public static DataSet RunProcedureGetDataSet(string storedProcName, OracleParameter[] parameters) { using (OracleConnection connection = new OracleConnection(connectionString)) { DataSet dataSet = new DataSet(); connection.Open(); OracleDataAdapter sqlDA = new OracleDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters); sqlDA.Fill(dataSet, "dt"); connection.Close(); return dataSet; } } #endregion #region 构建 OracleCommand 对象 /// <summary> /// 构建 OracleCommand 对象(用来返回一个结果集，而不是一个整数值) /// </summary> /// <param name="connection">数据库连接</param> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleCommand</returns> private static OracleCommand BuildQueryCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters) { OracleCommand command = new OracleCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (OracleParameter parameter in parameters) { command.Parameters.Add(parameter); } return command; } #endregion #region 执行存储过程，返回影响的行数 /// <summary> /// 执行存储过程，返回影响的行数 /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <param name="rowsAffected">影响的行数</param> /// <returns></returns> public static int RunProcedure_rowsAffected(string storedProcName, IDataParameter[] parameters, out int rowsAffected) { using (OracleConnection connection = new OracleConnection(connectionString)) { int result; connection.Open(); OracleCommand command = BuildIntCommand(connection, storedProcName, parameters); rowsAffected = command.ExecuteNonQuery(); result = (int)command.Parameters["ReturnValue"].Value; //Connection.Close(); return result; } } #endregion #region 创建 OracleCommand 对象实例 /// <summary> /// 创建 OracleCommand 对象实例(用来返回一个整数值) /// </summary> /// <param name="storedProcName">存储过程名</param> /// <param name="parameters">存储过程参数</param> /// <returns>OracleCommand 对象实例</returns> private static OracleCommand BuildIntCommand(OracleConnection connection, string storedProcName, IDataParameter[] parameters) { OracleCommand command = BuildQueryCommand(connection, storedProcName, parameters); command.Parameters.Add(new OracleParameter("ReturnValue", OracleType.Int32, 4, ParameterDirection.ReturnValue, false, 0, 0, string.Empty, DataRowVersion.Default, null)); return command; } #endregion #endregion #endregion #region 扩展方法 #region 执行返回一行一列的数据库操作 /// <summary> /// 执行返回一行一列的数据库操作 /// </summary> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>第一行第一列的记录</returns> public static int ExecuteScalar(string commandText, CommandType commandType, params OracleParameter[] param) { int count = 0; using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { try { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); count = Convert.ToInt32(cmd.ExecuteScalar()); } catch (Exception ex) { count = 0; } } } return count; } #endregion #region 执行不查询的数据库操作 /// <summary> /// 执行不查询的数据库操作 /// </summary> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>受影响的行数</returns> public static int ExecuteNonQuery(string commandText, CommandType commandType, params OracleParameter[] param) { int result = 0; using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { try { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); result = cmd.ExecuteNonQuery(); } catch (Exception ex) { result = 0; } } } return result; } #endregion #region 执行返回一条记录的泛型对象 /// <summary> /// 执行返回一条记录的泛型对象 /// </summary> /// <typeparam name="T">泛型类型</typeparam> /// <param name="reader">只进只读对象</param> /// <returns>泛型对象</returns> private static T ExecuteDataReader<T>(IDataReader reader) { T obj = default(T); try { Type type = typeof(T); obj = (T)Activator.CreateInstance(type);//从当前程序集里面通过反射的方式创建指定类型的对象 //obj = (T)Assembly.Load(OracleHelper._assemblyName).CreateInstance(OracleHelper._assemblyName + "." + type.Name);//从另一个程序集里面通过反射的方式创建指定类型的对象 PropertyInfo[] propertyInfos = type.GetProperties();//获取指定类型里面的所有属性 foreach (PropertyInfo propertyInfo in propertyInfos) { for (int i = 0; i < reader.FieldCount; i++) { string fieldName = reader.GetName(i); if (fieldName.ToLower() == propertyInfo.Name.ToLower()) { object val = reader[propertyInfo.Name];//读取表中某一条记录里面的某一列信息 if (val != null && val != DBNull.Value) propertyInfo.SetValue(obj, val, null);//给对象的某一个属性赋值 break; } } } } catch (Exception ex) { } return obj; } #endregion #region 执行返回一条记录的泛型对象 /// <summary> /// 执行返回一条记录的泛型对象 /// </summary> /// <typeparam name="T">泛型类型</typeparam> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>实体对象</returns> public static T ExecuteEntity<T>(string commandText, CommandType commandType, params OracleParameter[] param) { T obj = default(T); using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); while (reader.Read()) { obj = OracleHelper.ExecuteDataReader<T>(reader); } } } return obj; } #endregion #region 执行返回多条记录的泛型集合对象 /// <summary> /// 执行返回多条记录的泛型集合对象 /// </summary> /// <typeparam name="T">泛型类型</typeparam> /// <param name="commandText">Oracle语句或存储过程名</param> /// <param name="commandType">Oracle命令类型</param> /// <param name="param">Oracle命令参数数组</param> /// <returns>泛型集合对象</returns> public static List<T> ExecuteList<T>(string commandText, CommandType commandType, params OracleParameter[] param) { List<T> list = new List<T>(); using (OracleConnection connection = new OracleConnection(connectionString)) { using (OracleCommand cmd = new OracleCommand(commandText, connection)) { try { cmd.CommandType = commandType; cmd.Parameters.AddRange(param); connection.Open(); OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); while (reader.Read()) { T obj = OracleHelper.ExecuteDataReader<T>(reader); list.Add(obj); } } catch (Exception ex) { list = null; } } } return list; } #endregion #endregion #region 增删改查 #region 根据sequence名称获取下一个ID /// <summary> /// 根据sequence名称获取下一个ID /// </summary> public static int GetNextID(string sequenceName) { string sql = string.Format("select {0}.Nextval from dual", sequenceName); DataTable dt = Query(sql).Tables[0]; return int.Parse(dt.Rows[0][0].ToString()); } #endregion #region 添加 /// <summary> /// 添加 /// </summary> public static void Insert(object obj) { StringBuilder strSql = new StringBuilder(); Type type = obj.GetType(); strSql.Append(string.Format("insert into {0}(", type.Name)); PropertyInfo[] propertyInfoList = type.GetProperties(); List<string> propertyNameList = new List<string>(); int savedCount = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object val = propertyInfo.GetValue(obj, null); if (val != null) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } else { object val = propertyInfo.GetValue(obj, null); if (val != null) { propertyNameList.Add(propertyInfo.Name + "Id"); savedCount++; } } } } strSql.Append(string.Format("{0})", string.Join(",", propertyNameList.ToArray()))); strSql.Append(string.Format(" values ({0})", string.Join(",", propertyNameList.ConvertAll<string>(a => ":" + a).ToArray()))); OracleParameter[] parameters = new OracleParameter[savedCount]; int i = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object val = propertyInfo.GetValue(obj, null); if (val != null) { OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name, propertyInfo.GetValue(obj, null)); parameters[i++] = oracleParameter; } } else { object val = propertyInfo.GetValue(obj, null); if (val != null) { object valProVal = val.GetType().GetProperty("Id").GetValue(val, null); OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name + "Id", valProVal); parameters[i++] = oracleParameter; } } } } ExecuteSql(strSql.ToString(), parameters); } #endregion #region 修改 /// <summary> /// 修改 /// </summary> public static void Update(object obj) { object oldObj = Find(obj); if (oldObj == null) throw new Exception("无法获取到旧数据"); StringBuilder strSql = new StringBuilder(); Type type = obj.GetType(); strSql.Append(string.Format("update {0} ", type.Name)); PropertyInfo[] propertyInfoList = type.GetProperties(); List<string> propertyNameList = new List<string>(); int savedCount = 0; foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); if (!object.Equals(oldVal, val)) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } else { object val = propertyInfo.GetValue(obj, null); object oldVal = propertyInfo.GetValue(oldObj, null); object oldValProVal = oldVal == null ? null : GetIdVal(oldVal); object valProVal = val == null ? null : GetIdVal(val); if (!object.Equals(oldValProVal, valProVal)) { propertyNameList.Add(propertyInfo.Name); savedCount++; } } } } strSql.Append(string.Format(" set ")); OracleParameter[] parameters = new OracleParameter[savedCount]; int i = 0; StringBuilder sbPros = new StringBuilder(); foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(NotSaveAttribute), false).Length == 0) { if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length == 0) { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); if (!object.Equals(oldVal, val)) { sbPros.Append(string.Format(" {0}=:{0},", propertyInfo.Name)); OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name, val == null ? DBNull.Value : val); parameters[i++] = oracleParameter; } } else { object oldVal = propertyInfo.GetValue(oldObj, null); object val = propertyInfo.GetValue(obj, null); object oldValProVal = oldVal == null ? null : GetIdVal(oldVal); object valProVal = val == null ? null : GetIdVal(val); if (!object.Equals(oldValProVal, valProVal)) { sbPros.Append(string.Format(" {0}=:{0},", propertyInfo.Name + "Id")); OracleParameter oracleParameter = new OracleParameter(":" + propertyInfo.Name + "Id", valProVal == null ? DBNull.Value : valProVal); parameters[i++] = oracleParameter; } } } if (propertyInfo.GetCustomAttributes(typeof(IsEntityAttribute), false).Length > 0) { object val = propertyInfo.GetValue(obj, null); if (val != null && Find(val) != null) { Update(val); } } } if (sbPros.Length > 0) { strSql.Append(sbPros.ToString(0, sbPros.Length - 1)); } strSql.Append(string.Format(" where {0}={1}", GetIdName(obj.GetType()), int.Parse(GetIdVal(obj).ToString()))); if (savedCount > 0) { ExecuteSql(strSql.ToString(), parameters); } } #endregion #region 删除 /// <summary> /// 根据Id删除 /// </summary> public static void Delete<T>(int id) { Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); sbSql.Append(string.Format("delete from {0} where {2}={1}", type.Name, id, GetIdName(type))); ExecuteSql(sbSql.ToString()); } /// <summary> /// 根据Id集合删除 /// </summary> public static void BatchDelete<T>(string ids) { if (string.IsNullOrWhiteSpace(ids)) return; Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); sbSql.Append(string.Format("delete from {0} where {2} in ({1})", type.Name, ids, GetIdName(type))); ExecuteSql(sbSql.ToString()); } /// <summary> /// 根据条件删除 /// </summary> public static void Delete<T>(string conditions) { if (string.IsNullOrWhiteSpace(conditions)) return; Type type = typeof(T); StringBuilder sbSql = new StringBuilder(); sbSql.Append(string.Format("delete from {0} where {1}", type.Name, conditions)); ExecuteSql(sbSql.ToString()); } #endregion #region 获取实体 #region 根据实体获取实体 /// <summary> /// 根据实体获取实体 /// </summary> private static object Find(object obj) { Type type = obj.GetType(); object result = Activator.CreateInstance(type); bool hasValue = false; IDataReader rd = null; string sql = string.Format("select * from {0} where {2}={1}", type.Name, GetIdVal(obj), GetIdName(obj.GetType())); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = type.GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { object[] objArray = pro.GetCustomAttributes(typeof(IsEntityAttribute), false); if (objArray.Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return null; } } #endregion #region 根据Id获取实体 /// <summary> /// 根据Id获取实体 /// </summary> private static object FindById(Type type, int id) { object result = Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = false; string sql = string.Format("select * from {0} where {2}={1}", type.Name, id, GetIdName(type)); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = type.GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { object[] objArray = pro.GetCustomAttributes(typeof(IsEntityAttribute), false); if (objArray.Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return null; } } #endregion #region 根据Id获取实体 /// <summary> /// 根据Id获取实体 /// </summary> public static T FindById<T>(int id) where T : new() { Type type = typeof(T); T result = (T)Activator.CreateInstance(type); IDataReader rd = null; bool hasValue = false; string sql = string.Format("select * from {0} where {2}={1}", type.Name, id, GetIdName(type)); try { rd = ExecuteReader(sql); PropertyInfo[] propertyInfoList = type.GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { hasValue = true; IDataRecord record = rd; foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { object[] objArray = pro.GetCustomAttributes(typeof(IsEntityAttribute), false); if (objArray.Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(result, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(result, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } if (hasValue) { return result; } else { return default(T); } } #endregion #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> public static List<T> FindListBySql<T>(string sql) where T : new() { List<T> list = new List<T>(); object obj; IDataReader rd = null; try { rd = ExecuteReader(sql); if (typeof(T) == typeof(int)) { while (rd.Read()) { list.Add((T)rd[0]); } } else if (typeof(T) == typeof(string)) { while (rd.Read()) { list.Add((T)rd[0]); } } else { PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { IDataRecord record = rd; obj = new T(); foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { if (pro.GetCustomAttributes(typeof(IsEntityAttribute), false).Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(obj, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(obj, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } list.Add((T)obj); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } return list; } #endregion #region 获取列表 /// <summary> /// 获取列表 /// </summary> public static List<T> FindListBySql<T>(string sql, params OracleParameter[] cmdParms) where T : new() { List<T> list = new List<T>(); object obj; IDataReader rd = null; try { rd = ExecuteReader(sql, cmdParms); if (typeof(T) == typeof(int)) { while (rd.Read()) { list.Add((T)rd[0]); } } else if (typeof(T) == typeof(string)) { while (rd.Read()) { list.Add((T)rd[0]); } } else { PropertyInfo[] propertyInfoList = (typeof(T)).GetProperties(); int fcnt = rd.FieldCount; List<string> fileds = new List<string>(); for (int i = 0; i < fcnt; i++) { fileds.Add(rd.GetName(i).ToUpper()); } while (rd.Read()) { IDataRecord record = rd; obj = new T(); foreach (PropertyInfo pro in propertyInfoList) { if (pro.PropertyType.IsClass) { if (pro.GetCustomAttributes(typeof(IsEntityAttribute), false).Length > 0) { if (record[pro.Name + "Id"].GetType() == typeof(int)) { pro.SetValue(obj, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, (int)record[pro.Name + "Id"]), null); } if (record[pro.Name + "Id"].GetType() == typeof(decimal)) { pro.SetValue(obj, record[pro.Name + "Id"] == DBNull.Value ? null : FindById(pro.PropertyType, int.Parse(((decimal)record[pro.Name + "Id"]).ToString())), null); } continue; } } if (!fileds.Contains(pro.Name.ToUpper()) || record[pro.Name] == DBNull.Value) { continue; } pro.SetValue(obj, record[pro.Name] == DBNull.Value ? null : getReaderValue(record[pro.Name], pro.PropertyType), null); } list.Add((T)obj); } } } catch (Exception ex) { throw ex; } finally { if (rd != null && !rd.IsClosed) { rd.Close(); rd.Dispose(); } } return list; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <returns></returns> public static PageViewModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage) where T : new() { PageViewModel pageViewModel = new PageViewModel(); using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); string commandText = string.Format("select count(*) from ({0}) T", sql); IDbCommand cmd = new OracleCommand(commandText, connection); pageViewModel.total = int.Parse(cmd.ExecuteScalar().ToString()); int startRow = pageSize * (currentPage - 1); int endRow = startRow + pageSize; StringBuilder sb = new StringBuilder(); sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); List<T> list = FindListBySql<T>(sb.ToString()); pageViewModel.rows = list; } return pageViewModel; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <returns></returns> public static PageViewModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage, params OracleParameter[] cmdParms) where T : new() { PageViewModel pageViewModel = new PageViewModel(); using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); string commandText = string.Format("select count(*) from ({0}) T", sql); OracleCommand cmd = new OracleCommand(commandText, connection); PrepareCommand(cmd, connection, null, commandText, cmdParms); pageViewModel.total = int.Parse(cmd.ExecuteScalar().ToString()); cmd.Parameters.Clear(); int startRow = pageSize * (currentPage - 1); int endRow = startRow + pageSize; StringBuilder sb = new StringBuilder(); sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); List<T> list = FindListBySql<T>(sb.ToString(), cmdParms); pageViewModel.rows = list; } return pageViewModel; } #endregion #region 分页获取列表 /// <summary> /// 分页(任意entity，尽量少的字段) /// </summary> /// <typeparam name="T"></typeparam> /// <param name="sql"></param> /// <returns></returns> public static DataSet FindPageBySql(string sql, string orderby, int pageSize, int currentPage, out int resultCount, params OracleParameter[] cmdParms) { DataSet ds = null; using (OracleConnection connection = new OracleConnection(connectionString)) { connection.Open(); string commandText = string.Format("select count(*) from ({0}) T", sql); IDbCommand cmd = new OracleCommand(commandText, connection); resultCount = int.Parse(cmd.ExecuteScalar().ToString()); int startRow = pageSize * (currentPage - 1); int endRow = startRow + pageSize; StringBuilder sb = new StringBuilder(); sb.Append("select * from ( select row_limit.*, rownum rownum_ from ("); sb.Append(sql); if (!string.IsNullOrWhiteSpace(orderby)) { sb.Append(" "); sb.Append(orderby); } sb.Append(" ) row_limit where rownum <= "); sb.Append(endRow); sb.Append(" ) where rownum_ >"); sb.Append(startRow); ds = Query(sql, cmdParms); } return ds; } #endregion #region getReaderValue 转换数据 /// <summary> /// 转换数据 /// </summary> private static Object getReaderValue(Object rdValue, Type ptype) { if (ptype == typeof(decimal)) return Convert.ToDecimal(rdValue); if (ptype == typeof(int)) return Convert.ToInt32(rdValue); if (ptype == typeof(long)) return Convert.ToInt64(rdValue); return rdValue; } #endregion #region 获取主键名称 /// <summary> /// 获取主键名称 /// </summary> public static string GetIdName(Type type) { PropertyInfo[] propertyInfoList = type.GetProperties(); foreach (PropertyInfo propertyInfo in propertyInfoList) { if (propertyInfo.GetCustomAttributes(typeof(IsIdAttribute), false).Length > 0) { return propertyInfo.Name; } } return "Id"; } #endregion #region 获取主键值 /// <summary> /// 获取主键名称 /// </summary> public static object GetIdVal(object val) { string idName = GetIdName(val.GetType()); if (!string.IsNullOrWhiteSpace(idName)) { return val.GetType().GetProperty(idName).GetValue(val, null); } return 0; } #endregion #endregion #region 事务 #region 开始事务 /// <summary> /// 开始事务 /// </summary> public static void BeginTransaction() { GetTran(); AddTranFlag(); } #endregion #region 结束事务(正常结束) /// <summary> /// 结束事务(正常结束) /// </summary> public static void EndTransaction() { try { GetTran().Commit(); RemoveTranFlag(); } catch (Exception ex) { GetTran().Rollback(); RemoveTranFlag(); } finally { GetOpenConnection().Close(); } } #endregion #region 回滚事务(出错时调用该方法回滚) /// <summary> /// 回滚事务(出错时调用该方法回滚) /// </summary> public static void RollbackTransaction() { GetTran().Rollback(); RemoveTranFlag(); GetOpenConnection().Close(); } #endregion #endregion } }
辅助类代码：
NotSaveAttribute.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace DBUtil { /// <summary> /// ORM在保存数据的时候，会忽略打上 NotSave 批注的属性 /// </summary> [Serializable, AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)] public class NotSaveAttribute : Attribute { } }
IsEntityAttribute.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Models { /// <summary> /// 标识该属性是实体 /// </summary> [Serializable, AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)] public class IsEntityAttribute : Attribute { } }
PageViewModel.cs：
using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Web; namespace Models { public class PageViewModel { /// <summary> /// 记录 /// </summary> public IEnumerable rows { get; set; } /// <summary> /// 记录数 /// </summary> public int total { get; set; } } }
示例代码：
Models层代码：
Brand.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using DBUtil; namespace Models { public class Brand { public int Id { get; set; } public string Name { get; set; } public int BrandCount { get; set; } public DateTime? BrandDate { get; set; } [NotSave] public string NotSaved { get; set; } [IsEntity] public BrandChild bc { get; set; } public byte[] Blb { get; set; } public string Clb { get; set; } } }
BrandChild.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using DBUtil; namespace Models { public class BrandChild { public int Id { get; set; } public string Name { get; set; } public int Val { get; set; } [IsEntity] public BrandChildChild bcc { get; set; } } }
BrandChildChild.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace Models { public class BrandChildChild { public int Id { get; set; } public string Name { get; set; } public int Val { get; set; } } }
DAL层代码：
DalBase.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using DBUtil; using Models; namespace DAL { /// <summary> /// DAL基类 /// </summary> public class DalBase { /// <summary> /// 添加 /// </summary> public static void Insert(object obj) { OracleHelper.Insert(obj); } /// <summary> /// 修改 /// </summary> public static void Update(object obj) { OracleHelper.Update(obj); } /// <summary> /// 删除 /// </summary> public static void Delete<T>(int id) { OracleHelper.Delete<T>(id); } /// <summary> /// 批量删除 /// </summary> /// <param name="ids">ID集合，逗号隔开</param> public static void BatchDelete<T>(string ids) { OracleHelper.BatchDelete<T>(ids); } /// <summary> /// 查询列表 /// </summary> public static List<T> FindListBySql<T>(string sql) where T : new() { return OracleHelper.FindListBySql<T>(sql); } /// <summary> /// 分页查询列表 /// </summary> /// <param name="orderby">例："order by Id desc"</param> /// <param name="pageSize">每页数据条数</param> /// <param name="currentPage">当前页数</param> public static PageViewModel FindPageBySql<T>(string sql, string orderby, int pageSize, int currentPage) where T : new() { return OracleHelper.FindPageBySql<T>(sql, orderby, pageSize, currentPage); } } }
BrandDal.cs：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using DBUtil; namespace DAL.Admin { /// <summary> /// Brand /// </summary> public class BrandDal : DalBase { public static int GetNextID() { return OracleHelper.GetNextID("SEQ_BRAND"); } } }
Cotroller层测试代码片段：
public void Run() { #region 添加 if (false) { OracleHelper.BeginTransaction(); try { //子表的子表 BrandChildChild bcc1 = new BrandChildChild(); bcc1.Id = BrandDal.GetNextID(); bcc1.Name = "bcc1" + DateTime.Now.ToString(); BrandDal.Insert(bcc1); //子表 BrandChild bc1 = new BrandChild(); bc1.Id = BrandDal.GetNextID(); bc1.Name = "bc1" + DateTime.Now.ToString(); bc1.bcc = bcc1; OracleHelper.Insert(bc1); //主表 Brand bd1 = new Brand(); bd1.Id = BrandDal.GetNextID(); bd1.Name = "bd1" + DateTime.Now.ToString(); bd1.bc = bc1; OracleHelper.Insert(bd1); OracleHelper.EndTransaction(); } catch (Exception ex) { OracleHelper.RollbackTransaction(); } } #endregion #region 修改 if (false) { OracleHelper.BeginTransaction(); try { //替换子表 BrandChild bc1 = new BrandChild(); bc1.Id = BrandDal.GetNextID(); bc1.Name = "bc1" + DateTime.Now.ToString(); OracleHelper.Insert(bc1); //更新主表 Brand bd1 = OracleHelper.FindById<Brand>(27); bd1.Name = "bd1" + DateTime.Now.ToString(); bd1.bc = bc1; OracleHelper.Update(bd1); OracleHelper.EndTransaction(); } catch (Exception ex) { OracleHelper.RollbackTransaction(); } } #endregion #region 删除 if (false) { OracleHelper.BeginTransaction(); try { OracleHelper.Delete<Brand>(21); OracleHelper.BatchDelete<Brand>("22,23"); OracleHelper.EndTransaction(); } catch (Exception ex) { OracleHelper.RollbackTransaction(); } } #endregion #region 大文本 if (false) { Brand bd1 = OracleHelper.FindById<Brand>(27); bd1.Blb = Encoding.Default.GetBytes("大家好！"); bd1.Clb = "大家好！"; OracleHelper.Update(bd1); Brand bd12 = OracleHelper.FindById<Brand>(27); } #endregion #region 查询列表 List<Brand> brandList = BrandDal.FindListBySql<Brand>("select * from BRAND"); #endregion #region 分页查询列表 PageViewModel pageViewModel = BrandDal.FindPageBySql<Brand>("select * from BRAND", "order by Id desc", 10, 1); #endregion }