.NET的sqlHelper

 

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;

namespace ThirdWave.DAL
{

/// <summary>
/// 执行Sql 命令的通用方法
/// </summary>
public abstract class SqlHelper
{

//Database connection strings
public static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["ThirdWave"].ConnectionString;

#region ExecuteNonQuery
/// <summary>
/// 执行sql命令
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="commandType">命令类型</param>
/// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
/// <param name="commandParameters">参数</param>
/// <returns>受影响的行数</returns>
public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{

SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, commandType,conn, commandText, commandParameters);
int val = cmd.ExecuteNonQuery();

return val;
}
}

/// <summary>
/// 执行Sql Server存储过程
/// 注意：不能执行有out 参数的存储过程
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">对象参数</param>
/// <returns>受影响的行数</returns>
public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
{

using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, conn, spName, parameterValues);
int val = cmd.ExecuteNonQuery();

return val;
}
}
#endregion

#region ExecuteReader
/// <summary>
/// 执行sql命令
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="commandType">命令类型</param>
/// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
/// <param name="commandParameters">参数</param>
/// <returns>SqlDataReader 对象</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{

SqlConnection conn = new SqlConnection(connectionString);
try
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

return rdr;
}
catch
{
conn.Close();
throw;
}
}

/// <summary>
/// 执行Sql Server存储过程
/// 注意：不能执行有out 参数的存储过程
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">对象参数</param>
/// <returns>受影响的行数</returns>
public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
{
SqlConnection conn = new SqlConnection(connectionString);
try
{
SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, conn, spName, parameterValues);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

return rdr;
}
catch
{
conn.Close();
throw;
}

}
#endregion

#region ExecuteDataset

/// <summary>
/// 执行Sql Server存储过程
/// 注意：不能执行有out 参数的存储过程
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">对象参数</param>
/// <returns>DataSet对象</returns>
public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{
SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, conn, spName, parameterValues);

using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();

da.Fill(ds);

return ds;
}
}
}

/// <summary>
/// 执行Sql 命令
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="commandType">命令类型</param>
/// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
/// <param name="commandParameters">参数</param>
/// <returns>DataSet 对象</returns>
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
using (SqlConnection conn = new SqlConnection(connectionString))
{

SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();

da.Fill(ds);

return ds;
}
}
}

#endregion

#region ExecuteScalar
/// <summary>
/// 执行Sql 命令
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="commandType">命令类型</param>
/// <param name="commandText">sql语句/参数化sql语句/存储过程名</param>
/// <param name="commandParameters">参数</param>
/// <returns>执行结果对象</returns>
public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, commandType, conn, commandText, commandParameters);
object val = cmd.ExecuteScalar();

return val;
}
}

/// <summary>
/// 执行Sql Server存储过程
/// 注意：不能执行有out 参数的存储过程
/// </summary>
/// <param name="connectionString">连接字符串</param>
/// <param name="spName">存储过程名</param>
/// <param name="parameterValues">对象参数</param>
/// <returns>执行结果对象</returns>
public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
{
SqlCommand cmd = new SqlCommand();

using (SqlConnection conn = new SqlConnection(connectionString))
{
PrepareCommand(cmd, conn, spName, parameterValues);
object val = cmd.ExecuteScalar();

return val;
}
}

#endregion

#region Private Method
/// <summary>
/// 设置一个等待执行的SqlCommand对象
/// </summary>
/// <param name="cmd">SqlCommand 对象，不允许空对象</param>
/// <param name="conn">SqlConnection 对象，不允许空对象</param>
/// <param name="commandText">Sql 语句</param>
/// <param name="cmdParms">SqlParameters 对象,允许为空对象</param>
private static void PrepareCommand(SqlCommand cmd, CommandType commandType, SqlConnection conn, string commandText, SqlParameter[] cmdParms)
{
//打开连接
if (conn.State != ConnectionState.Open)
conn.Open();

//设置SqlCommand对象
cmd.Connection = conn;
cmd.CommandText = commandText;
cmd.CommandType = commandType;

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

/// <summary>
/// 设置一个等待执行存储过程的SqlCommand对象
/// </summary>
/// <param name="cmd">SqlCommand 对象，不允许空对象</param>
/// <param name="conn">SqlConnection 对象，不允许空对象</param>
/// <param name="spName">Sql 语句</param>
/// <param name="parameterValues">不定个数的存储过程参数，允许为空</param>
private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, string spName, params object[] parameterValues)
{
//打开连接
if (conn.State != ConnectionState.Open)
conn.Open();

//设置SqlCommand对象
cmd.Connection = conn;
cmd.CommandText = spName;
cmd.CommandType = CommandType.StoredProcedure;

//获取存储过程的参数
SqlCommandBuilder.DeriveParameters(cmd);

//移除Return_Value 参数
cmd.Parameters.RemoveAt(0);

//设置参数值
if (parameterValues != null)
{
for (int i = 0; i < cmd.Parameters.Count; i++)
{
cmd.Parameters[i].Value = parameterValues[i];

}
}
}
#endregion

}
}