using System;
using System.Collections;
using
System.Collections.Generic;
using System.Text;
using System.Data;
using
System.Data.SqlClient;
using System.Configuration;
namespace
Utility
{
public abstract class SqlHelper
{
protected static string connectionString =
ConfigurationSettings.AppSettings["ConnectionString"];
#region
执行简单SQL语句
/// <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)
{
using (SqlConnection
connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(SQLString, connection))
{
try
{
connection.Open();
int rows =
cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException E)
{
connection.Close();
throw new Exception(E.Message);
}
}
}
}
///
<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 void
ExecuteSqlTran(ArrayList SQLStringList)
{
using
(SqlConnection conn = new SqlConnection(connectionString))
{
conn.Open();
SqlCommand cmd = new
SqlCommand();
cmd.Connection = conn;
SqlTransaction tx = conn.BeginTransaction();
cmd.Transaction
= tx;
try
{
for
(int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList.ToString();
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch (System.Data.SqlClient.SqlException E)
{
tx.Rollback();
throw new
Exception(E.Message);
}
}
}
/// <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
(SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(SQLString,
connection);
System.Data.SqlClient.SqlParameter myParameter =
new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows =
cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.SqlClient.SqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <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
(SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand(strSQL, connection);
System.Data.SqlClient.SqlParameter myParameter = new
System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch
(System.Data.SqlClient.SqlException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
/// <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 (SqlConnection
connection = new SqlConnection(connectionString))
{
using (SqlCommand cmd = new SqlCommand(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.SqlClient.SqlException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
}
}
/// <summary>
///
执行查询语句，返回SqlDataReader
/// </summary>
/// <param
name="strSQL">查询语句</param>
///
<returns>SqlDataReader</returns>
public static
SqlDataReader ExecuteReader(string strSQL)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand(strSQL, connection);
try
{
connection.Open();
SqlDataReader
myReader = cmd.ExecuteReader();
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw new Exception(e.Message);
}
}
/// <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 (SqlConnection
connection = new SqlConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch
(System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 执行带参数的SQL语句
/// <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 SqlParameter[] cmdParms)
{
using (SqlConnection connection = new
SqlConnection(connectionString))
{
using
(SqlCommand cmd = new SqlCommand())
{
try
{
PrepareCommand(cmd,
connection, null, SQLString, cmdParms);
int rows =
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (System.Data.SqlClient.SqlException E)
{
throw new Exception(E.Message);
}
}
}
}
///
<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SqlParameter[]）</param>
public static void ExecuteSqlTran(Hashtable SQLStringList)
{
using (SqlConnection conn = new
SqlConnection(connectionString))
{
conn.Open();
using (SqlTransaction trans =
conn.BeginTransaction())
{
SqlCommand
cmd = new SqlCommand();
try
{
//循环
foreach (DictionaryEntry
myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
}
}
catch
{
trans.Rollback();
throw;
}
}
}
}
/// <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 SqlParameter[] cmdParms)
{
using (SqlConnection connection = new
SqlConnection(connectionString))
{
using
(SqlCommand cmd = new SqlCommand())
{
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.SqlClient.SqlException e)
{
throw new Exception(e.Message);
}
}
}
}
/// <summary>
/// 执行查询语句，返回SqlDataReader
/// </summary>
///
<param name="strSQL">查询语句</param>
///
<returns>SqlDataReader</returns>
public static
SqlDataReader ExecuteReader(string SQLString, params SqlParameter[]
cmdParms)
{
SqlConnection connection = new
SqlConnection(connectionString);
SqlCommand cmd = new
SqlCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
SqlDataReader myReader = cmd.ExecuteReader();
cmd.Parameters.Clear();
return myReader;
}
catch (System.Data.SqlClient.SqlException e)
{
throw new Exception(e.Message);
}
}
/// <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 SqlParameter[] cmdParms)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (System.Data.SqlClient.SqlException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private static void PrepareCommand(SqlCommand cmd,
SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[]
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 (SqlParameter parm in
cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
#region 存储过程操作
/// <summary>
/// 执行存储过程
/// </summary>
/// <param name="storedProcName">存储过程名</param>
///
<param name="parameters">存储过程参数</param>
///
<returns>SqlDataReader</returns>
public static
SqlDataReader RunProcedure(string storedProcName, IDataParameter[]
parameters)
{
SqlConnection connection = new
SqlConnection(connectionString);
SqlDataReader returnReader;
connection.Open();
SqlCommand command =
BuildQueryCommand(connection, storedProcName, parameters);
command.CommandType = CommandType.StoredProcedure;
returnReader =
command.ExecuteReader();
return returnReader;
}
/// <summary>
/// 执行存储过程
///
</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
RunProcedure(string storedProcName, IDataParameter[] parameters, string
tableName)
{
using (SqlConnection connection = new
SqlConnection(connectionString))
{
DataSet
dataSet = new DataSet();
connection.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter();
sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName,
parameters);
sqlDA.Fill(dataSet, tableName);
connection.Close();
return dataSet;
}
}
/// <summary>
/// 构建 SqlCommand
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>SqlCommand</returns>
private static SqlCommand
BuildQueryCommand(SqlConnection connection, string storedProcName,
IDataParameter[] parameters)
{
SqlCommand command =
new SqlCommand(storedProcName, connection);
command.CommandType =
CommandType.StoredProcedure;
foreach (SqlParameter parameter in
parameters)
{
command.Parameters.Add(parameter);
}
return
command;
}
/// <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 (SqlConnection connection = new
SqlConnection(connectionString))
{
int
result;
connection.Open();
SqlCommand
command = BuildIntCommand(connection, storedProcName, parameters);
rowsAffected = command.ExecuteNonQuery();
result =
(int)command.Parameters["ReturnValue"].Value;
//Connection.Close();
return result;
}
}
/// <summary>
/// 创建 SqlCommand
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>SqlCommand 对象实例</returns>
private static
SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName,
IDataParameter[] parameters)
{
SqlCommand command =
BuildQueryCommand(connection, storedProcName, parameters);
command.Parameters.Add(new SqlParameter("ReturnValue",
SqlDbType.Int, 4, ParameterDirection.ReturnValue,
false, 0,
0, string.Empty, DataRowVersion.Default, null));
return
command;
}
#endregion
public static int
GetMaxID(string FieldName, string TableName)
{
string
strsql = "select max(" + FieldName + ")+1 from " + TableName;
object obj = SqlHelper.GetSingle(strsql);
if (obj == null)
{
return 1;
}
else
{
return int.Parse(obj.ToString());
}
}
}
}