mysqli扩展库操作mysql数据库

• 配置环境

配置php.ini文件让php支持mysqli扩展库

extension=php_mysqli.dll

• 建库建表

详见博客 “mysql扩展库操作mysql数据库”

• 查询数据库

 <?php
     //mysqli扩展库操作mysql数据库，面向对象
     $mysqli=new MySQLi("localhost","root","root","test");
     if($mysqli->connect_error){
         die("连接数据库失败".$mysqli->connect_error);
     }
     $sql="select * from user1";
     $res=$mysqli->query($sql);
     while($row=$res->fetch_row()){
         foreach($row as $key=>$val){
             echo "--".$val;
         }
         echo "<br/>";
     }
     $res->free();
     $mysqli->close();
 ?>

结果如下：

• 增删改数据库

 <?php
     //mysqli扩展库操作mysql数据库，面向对象
     $mysqli=new MySQLi("localhost","root","root","test");
     if($mysqli->connect_error){
         die("连接数据库失败".$mysqli->connect_error);
     }
     //$sql="insert into user1 (name,password,age,birthday) values ('wpp',md5('wpp'),25,'1991-05-05')";
     //$sql="update user1 set age=24 where name='wpp'";
     $sql="delete from user1 where name='wpp'";
     $res=$mysqli->query($sql);
     if(!$res){
         echo "操作失败".$mysqli->error;
     }else{
         if($mysqli->affected_rows>0){
             echo "操作成功";
         }else{
             echo "没有行受到影响";
         }
     }
     $mysqli->close();
 ?>

•  把数据库操作封装成类

mysqliTool.class.php  数据库操作文件

 <?php
     class MysqliTool{
         private $mysqli;
         private $host="localhost";
         private $userName="root";
         private $pwd="root";
         private $db="test";
         public function __construct(){
             $this->mysqli=new MySQLi($this->host,$this->userName,$this->pwd,$this->db);
             if($this->mysqli->connect_error){
                 die("连接失败".$this->mysqli->connect_error);
             }
             $this->mysqli->query("set names utf8");
         }
         public function executeDql($sql){
             $res=$this->mysqli->query($sql) or die("操作dql失败".$this->mysqli->error);
             return $res;
         }
         public function executeDml($sql){
             $res=$this->mysqli->query($sql);
             if(!$res){
                 return 0;//0表示操作失败
             }else{
                 if($this->mysqli->affected_rows>0){
                     return 1;//1表示操作成功
                 }else{
                     return 2;//2表示没有行受到影响
                 }
             }
         }
         public function mysqliClo(){
             $this->mysqli->close();
         }
     }
 ?>

执行dql语句：

 <?php
     //引入类文件
     require_once "mysqliTool.class.php";
     //把类实例化
     $mysqliTool=new MysqliTool();
     //dql语句
     $sql="select * from user1";
     //执行sql语句
     $res=$mysqliTool->executeDql($sql);
     while($row=$res->fetch_row()){
         foreach($row as $key=>$val){
             echo "--".$val;
         }
         echo "<br/>";
     }
     $res->free();
     $mysqliTool->mysqliClo();
 ?>

执行dml语句：

 <?php
     //引入类文件
     require_once "mysqliTool.class.php";
     //把类实例化
     $mysqliTool=new MysqliTool();
     //dml语句
     //$sql="insert into user1 (name,password,age,birthday) values ('wpp',md5('wpp'),25,'1991-05-05')";
     //$sql="update user1 set age=24 where name='wpp'";
     $sql="delete from user1 where name='wpp'";
     //执行sml语句
     $res=$mysqliTool->executeDql($sql);
     if($res==0){
         echo "操作失败";
     }else if($res==1){
         echo "操作成功";
     }else if($res==2){
         echo "没有行受到影响";
     }
     $mysqliTool->mysqliClo();
 ?>