ASP.NET 连接mysql数据库

例题7-1

1、连接路径：Connection——>Command——>DataReader

2、源代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OleDb;
using MySql.Data.MySqlClient;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //第一步：得到Connection:MySqlConnection
        MySqlConnection conn = new MySqlConnection("Database=bookstore;Data Source=localhost;User Id=root;Password=root");
        conn.Open();
        string sqlcommandstring = "select * from account";
        //第二步:Command : MySqlCommand
        MySqlCommand mycommand = new MySqlCommand(sqlcommandstring,conn);
        //第三步:DataReader:  MySqlDataReader
        MySqlDataReader myreader = mycommand.ExecuteReader();
        while (myreader.Read())
        {
            showlabel.Text += myreader["accountid"] + " " + myreader["balance"];
        }
    }
}

3、http://dev.mysql.com/downloads/connector/net/

4、在网上上右击 ->添加->引用

在搜索栏中搜索Mysql.Data 添加上。

using MySql.Data.MySqlClient;只要这个不报错就行。

例题7-2

 protected void Page_Load(object sender, EventArgs e)
    {
        //第一步：得到Connection:MySqlConnection
        string stringconn = ConfigurationSettings.AppSettings["dsn"];
        MySqlConnection conn = new MySqlConnection(stringconn);
        conn.Open();
        //创建DataSet数据集对象
        DataSet MyDataSet = new DataSet();
        string sqlcommandstring = "select * from mybooks";
        MySqlDataAdapter mydataadapter = new MySqlDataAdapter(sqlcommandstring, conn);
        mydataadapter.Fill(MyDataSet, "Book_Table");
        //实现数据绑定与显示
        MyGirdView.DataSource = MyDataSet.Tables["Book_Table"];
        MyGirdView.DataBind();
    }

数据库的连接：

1、在类中设置连接

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using MySql.Data.MySqlClient;
/// <summary>
/// Conn 的摘要说明
/// </summary>
public class Conn
{
    public static MySqlConnection createCon()
    {
         return new MySqlConnection("Database=aspnet;Data Source=localhost;User Id=root;Password=root");
    }
}

2、在配置文件中设置连接

<?xml version="1.0"?>
<!--
  有关如何配置 ASP.NET 应用程序的详细信息，请访问
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
<appSettings>
<add key="dsn" value="Database=bookstore;Data Source=localhost;User Id=root;Password=root"/>
</appSettings>
 <connectionStrings> 
 <add name="ConnectionString1" connectionString="Data Source=oracle;User ID=scott;Password=tiger;Unicode=True" providerName="System.Data.OracleClient"/>
</connectionStrings> 
  <system.web>  
    <compilation debug="true" targetFramework="4.5"> 
      <assemblies>
        <add assembly="MySql.Data, Version=6.9.8.0, Culture=neutral, PublicKeyToken=C5687FC88969C44D"/>
      </assemblies>
    </compilation>
    <httpRuntime targetFramework="4.5"/>
  </system.web>
</configuration>

例题7-3

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MySql.Data.MySqlClient;


public partial class login : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //获取mysql数据库连接并打开数据库连接
        MySqlConnection mysqlconn = Conn.createCon();
        mysqlconn.Open();
        //填写查询语句 创建执行sql语句的command
        string mysqlcommandstring = "select * from user";
        MySqlCommand mysqlcommand = new MySqlCommand(mysqlcommandstring, mysqlconn);
        //穿件datareader数据阅读对象
        MySqlDataReader mysqldatareader = mysqlcommand.ExecuteReader();
        //兑取数据并显示
        string name = myname.Text;
        string password = mypassword.Text;
        int tag = 1;
        while (mysqldatareader.Read())
        {
            if (name.Equals(mysqldatareader["user_name"]) && password.Equals(mysqldatareader["user_password"]))
            {
                tag = 2;
                Response.Redirect("success.aspx");
            }
        }
        if (tag == 1)
        {
            Response.Write("登陆失败");
        }
    }
}

7.6.2实现GridView空间和ADO.NET实现数据操作