SqlTool.class.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');

}

//select

function execute_dql($sql){

$res = mysql_query($sql,$this->conn);

return $res;

}

//insert、update、delete

function 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

//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 "
";

}

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：