asp.net+mysql站点数据的操作

using System;
using System.Data;
using System.Text;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using MySql.Data.MySqlClient;//☆

namespace DB_
{
public class DB
{

public DB()
{
// 在此处添加构造函数逻辑
}

public MySqlConnection conntent()
{
string constr = "Data Source=127.0.0.1;port=3306;Database=test;User Id=root;Password=root;CharSet=utf8;allow zero datetime=true";
MySqlConnection con = new MySqlConnection(constr);
try
{
con.Open();
return con;// 成功
}
catch (Exception ex)
{
return null;//连接打开出现异常
}
}//连接字符串，返回MySqlConnection 链接对象

public DataSet Select(string sqlstr)//返回一个DataSet数据集或NULL
{
MySqlDataAdapter myadapter = new MySqlDataAdapter(sqlstr, conntent());
DataSet select = new DataSet();
int suc_count = myadapter.Fill(select);
if (select != null) { return select; }
else { return null; }
}

public MySqlDataReader Select1(string sqlstr)//返回一个MySqlDataReader对象，或null
{
MySqlCommand mycmd = new MySqlCommand(sqlstr,conntent());
try
{
MySqlDataReader select1 = mycmd.ExecuteReader();
if (select1 != null){ return select1; }
else { return null; }
}
catch (Exception ex)
{
return null;
}
}

public bool ZSG(string sqlstr)//根据传人的sqlstr 和 连接对象，执行操作
{//调用ZSG()函数进行增删改的操作,成功TRUE，失败FALSE
MySqlCommand mycmd = new MySqlCommand(sqlstr, conntent());
try
{
if (mycmd.ExecuteNonQuery() > 0)
{  return true;//成功 }
else
{ return false; }
}
catch{  return false;  }
}
}
}