About .net C# Sql database SQLHelper class example code-C#.Net Tutorial-php.cn

About .net C# Sql database SQLHelper class example code

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Release： 2017-06-23 16:16:55

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

public class SQLHelper
{
//Get the database connection configuration in web.config
public static readonly string ConnectString = ConfigurationManager.ConnectionStrings[ "DBString"].ConnectionString;

///

param name="cmdType">Stored procedure or Sql statement
/// Stored procedure name or Sql statement content
/ // Parameter list
; ///
; ; public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params SqlParameter [] CommandParams)
SqlCommand cmd = new SqlCommand(); reCommand( cmd, conn, null, cmdType, cmdText, CommandParams);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return val;

}

catch

#}

/// Operation category (stored procedure, sql)
/// Stored procedure name or Sql statement
/// Parameters
/// Return the number of affected data rows< ;/returns>
public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{

SqlCommand cmd = new SqlCommand();
PrepareComman d( cmd, trans.Connection, trans, cmdType, cmdText, CommandParams);
.Direction = ParameterDirection.ReturnValue;

cmd.ExecuteNonQuery(); if (cmdType == CommandType.Text) ery();

cmd.Parameters.Clear ();

return val;

}

///

/// 返回数据集 DataReader
///

///
///
///
///
public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
SqlCommand cmd = new SqlCommand();
SqlConnection conn = new SqlConnection(ConnectString);

try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, CommandParams);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}
catch (Exception ex)
{
conn.Close();
// throw new Exception("操作失败！");
throw new Exception(ex.Message);
}
}

///

/// 有事务的取数据
///

///
///
///
///
///
public static SqlDataReader ExecuteReader(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, CommandParams);
SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
cmd.Parameters.Clear();
return rdr;
}

public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
SqlCommand cmd = new SqlCommand();

SqlConnection conn = new SqlConnection(ConnectString);

try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, CommandParams);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;
}
catch
{
throw;
}
finally
{
conn.Close();
}

}

public static object ExecuteScalar(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
SqlCommand cmd = new SqlCommand();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, CommandParams);
object val = cmd.ExecuteScalar();
cmd.Parameters.Clear();
return val;

}

///

/// 根据Sql语句取得表
///

///
///
///
///
public static DataTable ExecuteTable(CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
DataTable temptable = new DataTable();

SqlCommand cmd = new SqlCommand();

SqlConnection conn = new SqlConnection(ConnectString);

try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, CommandParams);

SqlDataAdapter da = new SqlDataAdapter(cmd);

SqlCommandBuilder scb = new SqlCommandBuilder(da);

da.Fill(temptable);
}
finally
{
conn.Close();
}

return temptable;
}

public static DataTable ExecuteTable(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
DataTable temptable = new DataTable();
SqlCommand cmd = new SqlCommand();

PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, CommandParams);
SqlDataAdapter da = new SqlDataAdapter(cmd);
SqlCommandBuilder scb = new SqlCommandBuilder(da);
da.Fill(temptable);
cmd.Parameters.Clear();

return temptable;

}

///

/// 根据Sql语句或存储过程取得数据
///

///
///
///
///
public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
SqlConnection conn = new SqlConnection(ConnectString);

SqlCommand cmd = new SqlCommand();

DataSet TempDataSet = new DataSet();

try
{
PrepareCommand(cmd, conn, null, cmdType, cmdText, CommandParams);
SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd);
sqlAdapter.Fill(TempDataSet);
cmd.Parameters.Clear();
return TempDataSet;

}
finally
{
conn.Close();
}

}

public static DataSet ExecuteDataSet(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] CommandParams)
{
SqlCommand cmd = new SqlCommand();
DataSet TempDataSet = new DataSet();
PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, CommandParams);
SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd);
sqlAdapter.Fill(TempDataSet);
cmd.Parameters.Clear();
return TempDataSet;
}

///

/// 生成Sql语句或准备
///

///
///
///
///
///
///
private static 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;

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

cmd.CommandType = cmdType;

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

public static object ToDBValue(object value)
{
return value == null ? DBNull.Value : value;
}

public static object FromDBValue(object dbValue)
{
return dbValue == DBNull.Value ? null : dbValue;
}
}

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