在PHP中 使用mysqli擴充庫對mysql 的操作

1、在PHP中 使用mysqli擴充庫對mysql 的dql操作

<?php    header("Content-type: text/html;charset=utf-8");    //mysqli操作mysql資料庫(物件導向方式)    //1、建立MySQLi對象    $mysqli =new MySQLi("localhost","root","root","test");    if($mysqli->connect_error){        die("串連失敗".$mysqli->connect_error);    }    //2、操作資料庫（發送sql）    $sql="select *from user1";    //3、處理結果    $res =$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、關閉資源    $res->free();    $mysqli->close();?>

下面是面向過程的

<?php    header("Content-type: text/html;charset=utf-8");        $mysqli=mysqli_connect("localhost","root","root","test");    if(!$mysqli){        die("串連失敗".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/>';    }    //釋放記憶體    mysqli_free_result($res);    mysqli_close($mysqli);?>

2、在PHP中 使用mysqli擴充庫對mysql 的dml操作

<?php        //使用mysqli 擴充庫對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("串連失敗".$mysql->connect_error);    }    //增加一條記錄    //$sql="insert into user1 (name,password,email,age) values ('lucy',md5('lucy'),'lucy@163.com',17)";    //刪除一條記錄    //$sql="delete from user1 where id =80";    //更新一條記錄    $sql="update user1 set age=20 where id=7";    $res=$mysqli->query($sql);    if(!$res){        echo "操作失敗".$mysqli->error;    }else{        if($mysqli->affected_rows>0){            echo "成功";        }else{            echo "沒有行受影響";            }    }    //關閉資源    $mysqli->close();?>

 3、進行封裝 

<?    class SqlHelper{                private $mysqli;        //這裡先寫死，以後寫死的東西用一個檔案來配置        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("串連失敗".$this->mysqli->connect_error);            }            //設定字元集            $this->mysqli->query("set names utf8");        }        //dql operate        function execute_dql($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(!$res){                return 0;//失敗            }else{                if($this->mysqli->affected_rows>0){                    return 1;//成功                }else{                    return 2;//沒有行到影響                }            }        }    }?>