PHP MySql增删改查

Posted 2020-07-27 0x0c,0x0d

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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
    [email protected]_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($con); //关闭数据库
    /*delete
    [email protected]_connect(‘localhost‘,‘root‘,‘root‘);
    mysql_select_db(‘test‘,$d);
    mysql_query("delete from user where id=1",$d);
    mysql_close($d);
    */
    /*insert
    [email protected]_connect(‘localhost‘,‘root‘,‘root‘);
    mysql_select_db(‘test‘,$i);
    mysql_query("insert into user(username,password) values(‘ad‘,‘ad‘)",$i);
    mysql_close($i);
    */
    //update
    [email protected]_connect(‘localhost‘,‘root‘,‘root‘);
    mysql_select_db(‘test‘,$u);
    mysql_query("update user set username=‘aaa‘ where username=‘00‘",$u);
    echo "update user set username=‘ax‘ where id=2";
    mysql_close($u);
?>