SqlTool.class.php

<?php class SqlTool{private $conn;private $host = "localhost";private $user = "root";private $password = "root";private $db = "test1";/*连接数据库的构造方法*/function SqlTool(){$this->conn = mysql_connect($this->host , $this->user , $this->password);if(!$this->conn){die('连接失败'.mysql_error());}mysql_select_db($this->db,$this->conn);mysql_query('set names gbk');}//selectfunction execute_dql($sql){$res = mysql_query($sql,$this->conn);return $res;}//insert、update、deletefunction execute_dml($sql){$obj = mysql_query($sql,$this->conn);if(!$obj){//return 0;//操作失败die('操作失败'.mysql_error());}else{if(mysql_affected_rows($this->conn)>0){//return 1;//操作成功echo "操作成功";}else{//return 2;//行数没有收到影响die('行数没有受影响');}}}   }   ?>

SqlToolTest.php

<?php //引入数据库类文件require_once "SqlTool.class.php";//----------------dml操作------------------//插入//$sql = "insert into user1(name , password , email , age) values('李四',md5('123'),'lisi@163.com',18)";//删除//$sql = "delete from user1 where id = 9";//更新//$sql = "update user1 set id=4 where name='李四'";//创建一个SqlTool对象//$SqlTool = new SqlTool();//$res = $SqlTool->execute_dml($sql);//--------------------dql操作--------------------$sql = "select * from user1";//创建一个SqlTool对象$SqlTool = new SqlTool();$res = $SqlTool->execute_dql($sql);while($row=mysql_fetch_row($res)){foreach($row as $key=>$val){echo "--$val";}echo "<br>";}mysql_free_result($res);/*if($res==0){die('操作失败'.mysql_error());}else if($res==1){echo "操作成功";}else if($res==2){echo "行数没有受影响";}*/
?>

创建数据库
create database test1;

创建数据表

create table user1(
id int auto_increment primary key,
name varchar(32) not null,
password varchar(64) not null,
email varchar(128) not null,
age tinyint unsigned not null
);

表结构

后续操作的图片结果：