PHP MySql增删改查的简单实例

mysql_connect()连接数据库

mysql_select_db选择数据库

mysql_fetch_assoc()获取结果集

mysql_query()执行sql语句

实例如下：

    <?php
      $con=@mysql_connect('localhost','root','root');//连接数据库
      mysql_select_db('test',$con);//选择数据库
      $userInfo=mysql_query("select * from user",$con);//创建sql语句
      echo "<table>";
      while($row=mysql_fetch_assoc($userInfo))//获取结果集每一行的数据
      {
        echo "<tr>";
        echo "<td>";
        echo $row['id'];//获取行中的id
        echo "</td>";
        echo "<td>";
        echo $row['username'];
        echo "</td>";
        echo "<td>";
        echo $row['password'];
        echo "</td>";
        echo "</tr>";
      }
      echo "</table>";
      mysql_free_result($userInfo);//释放结果集
      mysql_close($con); //关闭数据库
      /*delete
      $d=@mysql_connect('localhost','root','root');
      mysql_select_db('test',$d);
      mysql_query("delete from user where id=1",$d);
      mysql_close($d);
      */
      /*insert
      $i=@mysql_connect('localhost','root','root');
      mysql_select_db('test',$i);
      mysql_query("insert into user(username,password) values('ad','ad')",$i);
      mysql_close($i);
      */
      //update
      $u=@mysql_connect('localhost','root','root');
      mysql_select_db('test',$u);
      mysql_query("update user set username='aaa' where username='00'",$u);
      echo "update user set username='ax' where id=2";
      mysql_close($u);
    ?>

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