mysql> create table user(
-> id int primary key auto_increment,
-> name varchar(32) not null,
-> password varchar(64) not null,
-> email varchar(128) not null,
-> age tinyint unsigned not null
-> );
mysql> insert into user (name,password,email,age) values("gjp",md5(123456),'gjp@
sohu.com',24);
mysql> insert into user (name,password,email,age) values("郭卢",md5(123456),'郭
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149535xxQw.png"></a>
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149535OzRU.png"></a>
Mysql客户端的限制,只能接受gbk码,utf8不支持,数据库是支持的
<?php
$conn=mysql_connect("localhost","root","123456");
if(!$conn)
{
die("出错了".mysql_errno());
}
mysql_select_db("test",$conn) or die(mysql_errno());
mysql_query("set names utf8");
$sql="insert into user (name,password,email,age) values('zhangsan',md5('123'),'[email protected]',34)";
$res=mysql_query($sql,$conn);
if(!$res)
echo "操作失败";
if (mysql_affected_rows($conn)>0)
echo "操作成功!";
}else{
echo "没有受影响的行数!";
mysql_close($conn); //要不要无所谓
?>
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_13841495368IVF.png"></a>
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_13841495367rJp.png"></a>
Sql语句换成删除:
$sql="delete from user where id=4";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149537pdwt.png"></a>
$sql="update user set age=26 where name='lzw'";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149538jn4B.png"></a>
将上面的文件,封装成类,提高复用性!
两个文件:
index.php
1. <?php
2. require_once 'Sqltool.php';
3. $sql="insert into user(name,password,email,age) values('lisi',md5('123'),'[email protected]',36)";
4. $sqlTool=new Sqltool();
5. $res=$sqlTool->execute_dml($sql);
6. if($res==0){
7. echo "失败";
8. }else if($res==1){
9. echo "success";
10. }else if($res==2){
11. echo "没有受影响的行数";
12. }
13. ?>
Sqltool.php
class Sqltool
private $conn;
private $host="localhost";
private $user="root";
private $password="123456";
private $db="test";
function Sqltool()
{
$this->conn=mysql_connect($this->host,$this->user,$this->password);
if(!$this->conn)
die("fail".mysql_error());
mysql_select_db($this->db,$this->conn);
mysql_query("set names utf8");
}
//dql 针对select
public function execute_dql($sql)
$res=mysql_query($sql,$this->conn)or die(mysql_error());
return $res;
// dml语句是针对update delete insert 命令,返回值为true false
public function execute_dml($sql)
echo $sql;
$b=mysql_query($sql,$this->conn);
if(!$b)
{
return 0;
}else {
if(mysql_affected_rows($this->conn)>0)
return 1;
}else{
return 2;
}
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149539ZbdB.png"></a>
命令改为$sql="delete from user where id=3";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149540cXwl.png"></a>
//DQL语句获取的是结果集,执行这的时候,要将dml语句先注释掉
$sql="select * from user";
$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);
执行结果如下:
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149542Y0nd.png"></a>
MYSQli的讲解2!
在php.ini 中开启
extension=php_mysqli.dll
例1:使用面向对象的方式
//header("Content-type: text/html; charset=utf-8");
//1.创建mysql对象
$msi=new mysqli("localhost","root","123456","test");
//验证是否ok
if($msi->cononnect_error){
die("连接失败".$msi->connect_error);
}else {
echo "连接ok"."</br>";
//2.操作数据库(发送sql命令)
$sql="select * from user ";
$res=$msi->query($sql);
/* echo "</br>";
print "<pre>";
var_dump($res);
print"</pre>"; */
//3.处理结果
while($row=$res->fetch_row()){
foreach ($row as $key=>$val){
//4.关闭资源
//释放内存;
$res->free();
//关闭链接
$msi->close();
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149543B6mU.png"></a>
由于上面少了这个$msi->query("set names utf8");所以出现汉字的乱码
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_13841495440Anq.png"></a>
正常了!
例2:用面向过程的方法
header("Content-type: text/html; charset=utf-8");
//1.得到mysqli连接
$msi=mysqli_connect("localhost","root","123456","test");
if(!$msi){
die("连接失败".mysqli_connect_errno($msi));
//2.向数据库发送sql语句(ddl dml dql)
$res=mysqli_query($msi,$sql);
//var_dump($res);
//3.处理得到的结果
//循环取出结果集
while($row=mysqli_fetch_row($res)){
foreach($row as $key=>$val){
mysqli_free_result($res);
mysqli_close($msi);
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149545ca8e.png"></a>
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149547rM9Y.png"></a>
如何区分这几个?
通过上面的程序修改演示:
var_dump($row);
print "</pre>";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149549DAkb.png"></a>
上面是以下标
while($row=mysqli_fetch_assoc($res)){
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149551H054.png"></a>
上面是以字段名,如id
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149552flYb.png"></a>
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_13841495538BM5.png"></a>
例3:
$msi->query("set names utf8");
$sql="insert into user (name,password,email,age) values('李想',md5('aaaa'),'[email protected]',18)";
if(!$res){
echo "操作失败".$msi->error;
//影响多少行记录
if($msi->affected_rows>0){
echo "执行ok";
echo "没有受影响的行数";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149553IpQr.png"></a>
执行了2次,添加了2条
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149555i5dt.png"></a>
把sql语句改为:(不存在的id)
$sql="update user set name='haha' where id=11";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149555CpCK.png"></a>
$sql="update user set name='haha' where id=9";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149557sqEV.png"></a>
$sql="delete from user where name='haha'";
增删改都使用了,这里我们来封装成工具类
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_13841495579HxM.png"></a>
Mysqli封装为工具类sqlHelper:
class sqlHelper{
private $mysqli;
private static $host="localhost";
private static $user="root";
private static $pwd="123456";
private static $db="test";
//下面这个函数__construct()其实是两个下划线,下面由于我写了一个,所以无法自动调用
该函数,需要手动调,如果写成两个_,创建对象时,则会自动调!
public function _construct(){
$this->mysqli=new mysqli(self::$host,self::$user,self::$pwd,self::$db);
if($this->mysqli->connect_error){
die("连接失败".$this->mysqli->connect_error);
echo "success"; //为了调试
//设置访问数据库的字符集,保证php是以utf8的方式来操作我们的mysql数据库
$this->mysqli->query("set names utf8");
public function execute_dql($sql){
$res=$this->mysqli->query($sql) or die("操作dql".$this->mysqli->error);
return $res;
public function execute_dml($sql){
echo $sql; //为了调试
$res=$this->mysqli->query($sql) or die("操作
dql".$this->mysqli->error);
echo $res;//为了调试
if($this->mysqli->affected_rows>0){
使用工具类,实现其功能:
require_once 'sqlHelper.php';
//header("Content-type: text/html;charset=utf-8");
//创建sqlHelper对象
$sqlhelper=new sqlHelper();
$sql="insert into user(name,password,email,age) values('卢伟da',md5('aaaa'),'[email protected]','8')";
$sqlhelper->_construct();
$res=$sqlhelper->execute_dml($sql);
if($res==0){
echo "失败";
if($res==1){
echo "恭喜,成功!";
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149558j4Cu.png"></a>
操作数据库成功如下:
<a href="http://guojiping.blog.51cto.com/attachment/201311/11/5635432_1384149559OUDz.png"></a>
本文转自 gjp0731 51CTO博http://blog.51cto.com/guojiping/1323187客,原文链接: