public datasource()

{

        ConnString = ConfigurationManager.ConnectionStrings["某數(shù)據(jù)源"].ConnectionString;
        SqlConn = new SqlConnection(ConnString);
        SqlCmd = new SqlCommand();
        SqlAdpter = new SqlDataAdapter();
        ds = new DataSet();

}

public DataSet Tds(string QueryString)
{
SqlAdpter.SelectCommand = new SqlCommand(QueryString, SqlConn);
SqlAdpter.Fill(ds, "temp");   //temp是一個(gè)內(nèi)存數(shù)據(jù)表
return ds;
}

public DataSet Tds()
{
//使用SQL語句來代替這個(gè)參數(shù)
SqlAdpter.SelectCommand = new SqlCommand("select * from abc", SqlConn);
//temp是一個(gè)內(nèi)存數(shù)據(jù)表
SqlAdpter.Fill(ds,"temp");   
return ds;
}

public SqlDataReader Tsdr()
    {
        //SqlCommand屬性CommandText是一條SQL語句
        SqlCmd.CommandText = "select * from abc"; 
 //SqlCommand屬性Connection 就是sql的連接語句
        SqlCmd.Connection = SqlConn;  
        SqlConn.Open();  
 //當(dāng)數(shù)據(jù)讀取隨著數(shù)據(jù)連接的關(guān)閉而關(guān)閉
        SqlReader = SqlCmd.ExecuteReader(CommandBehavior.CloseConnection); 
        return SqlReader;
    }

public void Update(string 字段id, string 字段1, string 字段2...string 字段N)
    {  

        SqlCmd.CommandText = "update 數(shù)據(jù)表 set [字段名1]=@字段名1,[字段名2]='" + 
 字段2 + "',..,[字段名N]='" + 字段N + "'  where [字段id]='" + 字段id + "'";
      // SqlCmd.Parameters.AddWithValue("@lname", au_lname);  更新的字段可以有單引號(hào)
        SqlCmd.Connection = SqlConn;   //連接
        SqlConn.Open();                //打開
        SqlCmd.ExecuteNonQuery();      //執(zhí)行
    }

public void Delete(string 字段id)
    { 
        SqlCmd.CommandText = "delete from [abc] where [字段id]='"+字段id+"'";
        SqlCmd.Connection = SqlConn;
        SqlConn.Open();
        SqlCmd.ExecuteNonQuery();
    }