mysqli类实例

<?php

class Mysql {
    private $mysqli;
    private static $ins;

    private function __construct(){
        $this->mysqli = new mysqli(‘192.168.88.10‘,‘root‘,‘root‘,‘blog‘);
        if(mysqli_connect_errno()) {
            printf(‘%s‘,mysqli_connect_error());
            $this->mysqli = false;
            exit;
        }
        $this->mysqli->set_charset(‘gbk‘);
    }

    public static function getMysql() {
        if(!(self::$ins instanceOf self)) {
            self::$ins = new self();
        }
        return self::$ins;
    }

    public function mQuery($sql) {
        return $this->mysqli->query($sql);
    }

    public function mGetAll($sql) {
        $rs = $this->mQuery($sql);
        if(!$rs) {
            return false;
        }
        $data = array();
        while($row = $rs->fetch_assoc()) {
            $data[] = $row;
        }
        $rs->close();
        return $data;
    }

    public function mGetRow($sql) {
        $rs = $this->mQuery($sql);
        if(!$rs) {
            return false;
        }
        $row = $rs->fetch_assoc();
        $rs->close();
        return $row;
    }

    public function mGetOne($sql) {
        $rs = $this->mQuery($sql);
        if(!$rs) {
            return false;
        }
        $row = $rs->fetch_row();
        $rs->close();
        return $row[0];
    }
    
    /*
        insert into cat(catname,num) values(‘aa‘,0);
        update cat set catname=‘aa‘,num=900 where cat_id = 10;
    */
    public function mExec($table,$data,$act=‘insert‘,$where=‘0‘) {
        
        $sql = ‘‘;
        if($act == ‘insert‘) {
            $sql .= ‘insert into ‘.$table .‘(‘;
            $sql .= implode(‘,‘,array_keys($data)).‘) ‘;
            $sql .= ‘ values("‘;
            $sql .= implode(‘","‘,array_values($data)).‘")‘;
        }elseif($act == ‘update‘) {
            $sql .= ‘update ‘.$table.‘ set ‘;
            foreach($data as $k=>$v) {
                $sql .= $k.‘="‘.$v.‘",‘;
            }
            $sql = rtrim($sql,‘,‘);
            $sql .= ‘ where ‘.$where;
        }

        return $this->mQuery($sql);
    }

    public function close(){
        if($this->mysqli) {
            $this->mysqli->close();
        }
    }

    public function __destruct() {
        $this->close();
    }
}

/*
header(‘Content-type:text/html;charset=gbk‘);
$db = Mysql::getMysql();
//$sql = ‘select count(*) from cat where cat_id = 1‘;
//var_dump($db->mGetOne($sql));
$data = array(‘catname‘=>‘testaa‘,‘num‘=>100);

$db->mExec(‘cat‘,$data,‘update‘,‘cat_id=1‘);

*/