sqlhelper

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Web.Configuration; 

/// <summary>
/// mysqlconnect 的摘要说明
/// </summary>
public class mysqlconnect
{   
    private int intCount = 0;

    public mysqlconnect()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public SqlConnection DBconn()
    {
        string strConn =ConfigurationManager.ConnectionStrings["CustomerDataConnectionString"].ConnectionString;
        try
        {
            return new SqlConnection(strConn);
        }
        catch (Exception)
        {
            return null;
        }
    }
   
    /// 根据查询语句从数据库检索数据
    /// </summary>
    /// <param name="strSelect">查询语句</param>
    /// <param name="SqlConn">数据库连接</param>
    /// <returns>有数据则返回DataSet对象，否则返回null</returns>
    public DataSet Select(string SelectString, SqlConnection sqlConn, ref string arg_msg)
    {
        arg_msg = "";
        SqlConnection conn;
        if (sqlConn == null)
        {
            conn = DBconn();
        }
        else
        {
            conn = sqlConn;
        }
        try
        {
            //若数据库连接的当前状态是关闭的，则打开连接
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }
            SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
            SqlCommand selectCommand = new SqlCommand(SelectString, conn);
            selectCommand.CommandTimeout = 1200;
            selectCommand.CommandType = CommandType.Text;
            mySqlDataAdapter.SelectCommand = selectCommand;
            DataSet myDS = new DataSet();
            mySqlDataAdapter.Fill(myDS);
            return myDS;
        }
        catch (Exception e)
        {
            arg_msg = "数据检索失败：" + e.Message;
            return null;
        }
        finally
        {
            if (conn.State != ConnectionState.Closed)
            {
                conn.Close();
            }
        }
    }



    /// 更新数据库
    /// </summary>
    /// <param name="UpdateString">Update Sql语句</param>
    /// <param name="SqlConn">数据库连接</param>
    /// <returns>更新成功返回true</returns>
    public bool Update(string UpdateString, SqlConnection SqlConn, ref string arg_msg)
    {
        return udiDataBase(UpdateString, SqlConn,ref arg_msg);
    }



    /// <summary>
    /// 从数据库中删除数据
    /// </summary>
    /// <param name="DeleteString">Delete Sql语句</param>
    /// <param name="SqlConn">数据库连接</param>
    /// <returns>删除成功返回true</returns>
    public bool Delete(string DeleteString, SqlConnection SqlConn, ref string arg_msg)
    {
        return udiDataBase(DeleteString, SqlConn, ref arg_msg);
    }


    /// <summary>
    /// 把数据插入数据库
    /// </summary>
    /// <param name="InsertString">Insert Sql语句</param>
    /// <param name="SqlConn">数据库连接</param>
    /// <returns>插入成功返回true</returns>
    public bool Insert(string InsertString, SqlConnection SqlConn, ref string arg_msg)
    {
        return udiDataBase(InsertString, SqlConn, ref arg_msg);
    }


    /// <summary>
    /// 根据Sql语句更新数据库
    /// </summary>
    /// <param name="UDIString">更新语句</param>
    /// <param name="SqlConn">数据库连接</param>
    /// <returns>更新成功则返回true</returns>
    public bool udiDataBase(string UDIString, SqlConnection SqlConn, ref string arg_msg)
    {
        arg_msg = "";
        SqlConnection conn;

        if (SqlConn == null)
        {
            conn = DBconn();
        }
        else
        {
            conn = SqlConn;
        }
        try
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }


            //SqlTransaction transaction;

            //transaction = conn.BeginTransaction("SampleTransaction");
            
            SqlCommand cmd = new SqlCommand(UDIString, conn);
            
            cmd.CommandType = CommandType.Text;

           // cmd.Transaction = transaction;

            intCount = cmd.ExecuteNonQuery();

            //transaction.Commit();

            //return !(intCount < 1);

            return true;
        }
        catch (Exception e)
        {
            arg_msg = "更新数据库失败：" + e.Message;
            //transaction.Rollback();
            return false;
        }
        finally
        {
            if (conn.State != ConnectionState.Closed)
            {
                conn.Close();
            }
        }
    }

    public bool master_udiDataBase(string UDIString, ref string arg_msg)
    {
        arg_msg = "";
        SqlConnection conn = new SqlConnection("server=127.0.0.1;database=master;uid=sa;pwd=;");
        try
        {
            if (conn.State == ConnectionState.Closed)
            {
                conn.Open();
            }

            SqlCommand cmd = new SqlCommand(UDIString, conn);
            cmd.CommandType = CommandType.Text;
            cmd.ExecuteNonQuery();
            return true;
        }
        catch (Exception e)
        {
            arg_msg = "更新数据库失败：" + e.Message;
            return false;
        }
        finally
        {
            if (conn.State != ConnectionState.Closed)
            {
                conn.Close();
            }
        }
    }
}