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本篇文章是对在PHP中使用mysqli扩展库对mysql的操作进行了详细的分析介绍,需要的朋友参考下
1、在PHP中 使用mysqli扩展库对mysql 的dql操作 复制代码 代码如下: <?php header("Content-type: text/html;charset=utf-8"); //mysqli操作mysql数据库(面向对象方式) //1、创建MySQLi对象 $mysqli =new MySQLi("localhost","root","root","test"); if($mysqli->connect_error){ die("连接失败".$mysqli->connect_error); } //2、操作数据库(发送sql) $sql="select *from user1"; //3、处理结果 $res =$mysqli->query($sql); //var_dump($res); //fetch_assoc \fetch_array \fetch_object while($row=$res->fetch_row()){ var_dump($row); /* foreach($row as $val){ echo '--'.$val; } echo '<br/>';*/ } //4、关闭资源 $res->free(); $mysqli->close(); ?>
下面是面向过程的 复制代码 代码如下: <?php header("Content-type: text/html;charset=utf-8");
$mysqli=mysqli_connect("localhost","root","root","test"); if(!$mysqli){ die("连接失败".mysqli_connect_error()); } $sql="select *from user1"; $res=mysqli_query($mysqli,$sql); //var_dump($res); while($row=mysqli_fetch_row($res)){
foreach ($row as $val){
echo '-'.$val; } echo '<br/>'; } //释放内存 mysqli_free_result($res); mysqli_close($mysqli); ?>
2、在PHP中 使用mysqli扩展库对mysql 的dml操作 复制代码 代码如下: <?php
//使用mysqli 扩展库对mysql的crud 操作 header("Content-type: text/html;charset=utf-8"); $mysqli = new MySQLi("localhost","root","root","test"); if($mysqli->connect_error){ die("连接失败".$mysql->connect_error); } //增加一条记录 //$sql="insert into user1 (name,password,email,age) values ('lucy',md5('lucy'),'lucy@163.com',17)"; //删除一条记录 //$sql="delete from user1 where id =80"; //更新一条记录 $sql="update user1 set age=20 where id=7"; $res=$mysqli->query($sql); if(!$res){ echo "操作失败".$mysqli->error; }else{ if($mysqli->affected_rows>0){ echo "成功"; }else{ echo "没有行受影响"; } } //关闭资源 $mysqli->close(); ?>
3、进行封装 复制代码 代码如下: <? class SqlHelper{
private $mysqli; //这里先写死,以后写死的东西用一个文件来配置 private static $host="localhost"; private static $user="root"; private static $pwd="root"; private static $db="test"; 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); } //设置字符集 $this->mysqli->query("set names utf8"); } //dql operate function execute_dql($sql){ $res =$this->mysqli->query($sql) or die($this->mysqli->error); return $res; } //dml operate function execute_dml($sql){ $res =$this->mysqli->query($sql) or die($this->mysqli->error);
if(!$res){ return 0;//失败 }else{ if($this->mysqli->affected_rows>0){ return 1;//成功 }else{ return 2;//没有行到影响 } } } } ?>
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