简洁的MysqlHelper

把MySqlXXX的类更改为SqlXXX就可以成为sqlHelper.

另外C#也提供了MysqlHelper和sqlHelper，用起来也挺方便的。

 public class MySqlHelper
     {
       private static readonly  string connstr = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
         public MySqlConnection CreateConnection()
         {
             MySqlConnection conn = new MySqlConnection(connstr);
             conn.Open();
             return conn;
         }
         public int ExecuteNonQuery(string sql,params MySqlParameter[]parameters)
         {
             using (MySqlConnection conn=CreateConnection())
             using(MySqlCommand cmd=conn.CreateCommand())
             {
                 cmd.CommandText = sql;
                 cmd.Parameters.AddRange(parameters);
                return cmd.ExecuteNonQuery();
             }
         }
         public object ExecuteScalar(string sql,params MySqlParameter[]parameters)
         {
             using (MySqlConnection conn=CreateConnection())
             using (MySqlCommand cmd=conn.CreateCommand())
             {
                 cmd.CommandText = sql;
                 cmd.Parameters.AddRange(parameters);
                return cmd.ExecuteScalar();
             }

         }

         public MySqlDataReader ExecuteReader(string sql,params MySqlParameter[]ps)
         {
             using (MySqlConnection conn=CreateConnection())
             using(MySqlCommand cmd=conn.CreateCommand())
             {
                 cmd.CommandText = sql;
                 if (ps!=null)
                 {
                     cmd.Parameters.AddRange(ps);
                 }
                return cmd.ExecuteReader();
             }
         }
         public DataTable ExecuteDataTable(string sql,params MySqlParameter[]ps)
         {
             DataTable table = new DataTable();
             using (MySqlConnection conn=CreateConnection())
             using(MySqlCommand cmd=conn.CreateCommand())
             {
                 cmd.CommandText = sql;
                 if (ps!=null)
                 {
                     cmd.Parameters.AddRange(ps);
                 }
                 using ( MySqlDataAdapter adapter = new MySqlDataAdapter(cmd))
                 {
                     adapter.Fill(table);
                 }
                 return table;
             }
         }
     }