ADO.net方法

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Reflection;

namespace DAL.DataUtil
{
/// <summary>
/// SqlServer数据访问控制类
/// </summary>
public class DataProvider
{
public string ConnectionString { get; set; }

#region 私有方法

/// <summary>
/// SqlCommand 对象执行SQL脚本前的准备工作
/// </summary>
/// <param name="cmd">SqlCommand 对象</param>
/// <param name="conn">SqlConnection 对象</param>
/// <param name="trans">SqlTransaction 对象</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdParms">SqlCommand 对象使用的 SqlParameter 参数集合</param>
private void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans,
CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();

cmd.Connection = conn;
cmd.CommandText = cmdText;
cmd.CommandType = cmdType;

if (trans != null)
cmd.Transaction = trans;

if (cmdParms != null)
{
foreach (SqlParameter param in cmdParms)
cmd.Parameters.Add(param);
}
}

/// <summary>
/// SqlDataAdapter 对象使用前的准备工作
/// </summary>
/// <param name="adapter">SqlDataAdapter 对象</param>
/// <param name="conn">SqlConnection 对象</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdParms">SqlCommand 对象使用的 SqlParameter 参数集合</param>
private void PrepareAdapter(SqlDataAdapter adapter, SqlConnection conn,
CommandType cmdType, string cmdText, SqlParameter[] cmdParms)
{
SqlCommand cmd = new SqlCommand(cmdText, conn);

cmd.CommandType = cmdType;
if (cmdParms != null)
{
foreach (SqlParameter param in cmdParms)
cmd.Parameters.Add(param);
}
adapter.SelectCommand = cmd;
}

#endregion

#region 公有方法

/// <summary>
/// 对连接执行 SQL 语句并返回受影响的行数。
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>受影响的行数</returns>
public int ExecuteNonQuery(string cmdText, CommandType cmdType)
{
return ExecuteNonQuery(cmdText, cmdType, null);
}

/// <summary>
/// 对连接执行 SQL 语句并返回受影响的行数。
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>受影响的行数</returns>
public int ExecuteNonQuery(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlCommand cmd = new SqlCommand();
int val = 0;
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
conn.Open();
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
val = cmd.ExecuteNonQuery();
if (parameters != null)
{
cmd.Parameters.Clear();
}
}
catch
{
conn.Close();
conn.Dispose();
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
return val;
}
}

/// <summary>
/// 对连接执行多条 SQL 语句，并加入事务处理
/// </summary>
/// <param name="cmdTexts">SQL 语句数组</param>
public void ExecuteNonQueryWithTransaction(string[] cmdTexts)
{
SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(ConnectionString))
{
conn.Open();
SqlTransaction trans = conn.BeginTransaction();

try
{
foreach (string sql in cmdTexts)
{
PrepareCommand(cmd, conn, trans, CommandType.Text, sql, null);
cmd.ExecuteNonQuery();
}
trans.Commit();
}
catch
{
trans.Rollback();
conn.Close();
conn.Dispose();
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
}
}

/// <summary>
/// 对连接执行多条 SQL 语句，并加入事务处理
/// </summary>
/// <param name="commands">SQL命令数组。
/// Command 封装了 SqlCommand 对象需要的 CommandText、CommandType、SqlParameterCollection，以便分别执行每一组SQL脚本</param>
public void ExecuteNonQueryWithTransaction(Command[] commands)
{
SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(ConnectionString))
{
conn.Open();
SqlTransaction trans = conn.BeginTransaction();

try
{
foreach (Command command in commands)
{
PrepareCommand(cmd, conn, trans, command.CommandType, command.CommandText, command.Parameters);
cmd.ExecuteNonQuery();
if (command.Parameters != null)
{
cmd.Parameters.Clear();
}
}
trans.Commit();
}
catch
{
trans.Rollback();
conn.Close();
conn.Dispose();
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
}
}

/// <summary>
/// 执行SQL脚本，返回查询得到的 DataReader 结果集
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>DataReader 结果集</returns>
public SqlDataReader ExecuteReader(string cmdText, CommandType cmdType)
{
return ExecuteReader(cmdText, cmdType, null);
}

/// <summary>
/// 执行SQL脚本进行查询，返回得到的 DataReader 结果集
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>DataReader 结果集</returns>
public SqlDataReader ExecuteReader(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(ConnectionString);

try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
if (parameters != null)
{
cmd.Parameters.Clear();
}

return reader;
}
catch
{
conn.Close();
conn.Dispose();
throw;
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
}

/// <summary>
/// 执行查询，并返回查询所返回的结果集中第一行的第一列。忽略其他列或行。
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>结果集中第一行的第一列</returns>
public object ExecuteScalar(string cmdText, CommandType cmdType)
{
return ExecuteScalar(cmdText, cmdType, null);
}

/// <summary>
/// 执行查询，并返回查询所返回的结果集中第一行的第一列。忽略其他列或行。
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>结果集中第一行的第一列</returns>
public object ExecuteScalar(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlCommand cmd = new SqlCommand();
object val = new object();
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
conn.Open();
try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);
val = cmd.ExecuteScalar();
if (parameters != null)
{
cmd.Parameters.Clear();
}
}
catch
{
conn.Close();
conn.Dispose();
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
return val;
}
}

/// <summary>
/// 执行查询，将查询结果填充到 DataSet 并返回
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>查询结果集</returns>
public DataSet FillDataSet(string cmdText, CommandType cmdType)
{
return FillDataSet(cmdText, cmdType, null);
}

/// <summary>
/// 执行查询，将查询结果填充到 DataSet 并返回
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>查询结果集</returns>
public DataSet FillDataSet(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlDataAdapter adapter = new SqlDataAdapter();
DataSet dataSet = new DataSet();
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
conn.Open();
try
{
PrepareAdapter(adapter, conn, cmdType, cmdText, parameters);
adapter.Fill(dataSet);
}
catch
{
conn.Close();
conn.Dispose();
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
return dataSet;
}
}

/// <summary>
/// 执行查询，将查询结果填充到 DataTable 并返回
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>查询结果集</returns>
public DataTable FillDataTable(string cmdText, CommandType cmdType)
{
return FillDataTable(cmdText, cmdType, null);
}

/// <summary>
/// 执行查询，将查询结果填充到 DataTable 并返回
/// </summary>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>查询结果集</returns>
public DataTable FillDataTable(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlDataAdapter adapter = new SqlDataAdapter();
DataTable table = new DataTable();
using (SqlConnection conn = new SqlConnection(ConnectionString))
{
conn.Open();
try
{
PrepareAdapter(adapter, conn, cmdType, cmdText, parameters);
adapter.Fill(table);
}
catch
{
conn.Close();
conn.Dispose();
}
finally
{
if (conn.State != ConnectionState.Closed)
{
conn.Close();
conn.Dispose();
}
}
return table;
}
}

/// <summary>
/// 执行只返回一条记录的查询，把返回的记录反射成一个实体对象，实体对象类型由传入的类型决定。
/// 传入的类型和返回类型要一致
/// </summary>
/// <typeparam name="T">要反射封装的对象实体类型。必须和返回类型一致</typeparam>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>封装好的对象实体。必须和传入参数类型一致</returns>
public T ReflectObject<T>(string cmdText, CommandType cmdType)
{
return ReflectObject<T>(cmdText, cmdType, null);
}

/// <summary>
/// 执行只返回一条记录的查询，把返回的记录反射成一个实体对象，实体对象类型由传入的类型决定。
/// 传入的类型和返回类型要一致
/// </summary>
/// <typeparam name="T">要反射封装的对象实体类型。必须和返回类型一致</typeparam>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>封装好的对象实体。必须和传入参数类型一致</returns>
public T ReflectObject<T>(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlCommand cmd = new SqlCommand();
T obj = default(T);

using (SqlConnection conn = new SqlConnection(ConnectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);

using (SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection | CommandBehavior.SingleRow))
{
if (reader.Read())
{
obj = (T)Activator.CreateInstance(typeof(T));
Type type = obj.GetType();

for (int i = 0; i < reader.FieldCount; i++)
{
if (!reader.IsDBNull(i))
{
try
{
type.InvokeMember(reader.GetName(i), BindingFlags.Default | BindingFlags.SetProperty, null, obj, new object[] { reader.GetValue(i) });
}
catch (MissingMemberException exception)
{
//Column/Property names don't match, thus throwing an exception. Ignored
System.Diagnostics.Debug.WriteLine(exception.Message);
}
}
}

reader.Close();
}
}
if (conn.State != ConnectionState.Closed)
{
conn.Close();
}
}

return obj;
}

/// <summary>
/// 执行查询，把返回的记录集反射成一个实体对象集合，实体对象类型由传入的类型决定。
/// 传入的类型和返回类型要一致
/// </summary>
/// <typeparam name="T">要反射封装的对象实体类型。必须和返回类型一致</typeparam>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <returns>封装好的实体集合。必须和传入参数类型一致</returns>
public List<T> ReflectCollection<T>(string cmdText, CommandType cmdType)
{
return ReflectCollection<T>(cmdText, cmdType, null);
}

/// <summary>
/// 执行查询，把返回的记录集反射成一个实体对象集合，实体对象类型由传入的类型决定。
/// 传入的类型和返回类型要一致
/// </summary>
/// <typeparam name="T">要反射封装的对象实体类型。必须和返回类型一致</typeparam>
/// <param name="cmdText">SQL脚本</param>
/// <param name="cmdType">命令类型：存储过程或普通SQL脚本</param>
/// <param name="parameters">SqlParameter 参数集合</param>
/// <returns>封装好的实体集合。必须和传入参数类型一致</returns>
public List<T> ReflectCollection<T>(string cmdText, CommandType cmdType, SqlParameter[] parameters)
{
SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(ConnectionString))
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, parameters);

using (SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
List<T> objList = new List<T>();

while (reader.Read())
{
T obj = (T)Activator.CreateInstance(typeof(T));
Type type = obj.GetType();

for (int i = 0; i < reader.FieldCount; i++)
{
if (!reader.IsDBNull(i))
{
try
{
type.InvokeMember(reader.GetName(i), BindingFlags.Default | BindingFlags.SetProperty, null, obj, new object[] { reader.GetValue(i) });
}
catch (MissingMemberException exception)
{
//Column/Property names don't match, thus throwing an exception. Ignored
System.Diagnostics.Debug.WriteLine(exception.Message);
}
}
}
objList.Add(obj);
}

reader.Close();
if (conn.State != ConnectionState.Closed)
{
conn.Close();
}
return objList;
}
}
}

#endregion
}
}