Heim  >  Artikel  >  Backend-Entwicklung  >  PHP mysql操作类程序_PHP教程

PHP mysql操作类程序_PHP教程

WBOY
WBOYOriginal
2016-07-20 11:11:21821Durchsuche

一个不错的PHP mysql操作类 ,分享给大家学习使用。

 代码如下 复制代码

//数据库处理类
class db
{
    //SQL执行后的数据保存变量;
    var $db;
    //读取或设置当前数据的位置
    var $position=0;
    //执行SQL语句并把结果保存为db变量中;

    function sub_sql($str)
    {
        global $prefix;//全局函数,表前缀
        return str_replace("dede_",$prefix,$str);
    }
    function Sql($str)
    {
        $str=$this->sub_sql($str);
        $result = mysql_query($str);
        $i=0;
        while($row = mysql_fetch_array($result))
        {
            $str_array[$i]=$row;
            $i++;
        }
        if(empty($str_array))
        {
            $str_array=array();
        }
        $this->db=$str_array;
    }
    //读取一条数据并把数据往后移一位,如果数据为空则返回为null;
    function Get_One()
    {
        $re=empty($this->db[$this->position])?null:$this->db[$this->position];
        $this->position=$re?$this->position+1:$this->position;
        return $re;
    }
    //判断是否数据读取到结尾了
    function Judge()
    {
        $re=empty($this->db[$this->position])?true:false;
        return $re;
    }
    //取得db里面的个数
    function Get_Num()
    {
        return count($this->db);
    }
    //更新数据库里面的数据,$t为表名,$v格式为数组格式,上标为字段名,下标为数据;$w为条件上标为字段名下标为数据,$p为条件0为等号,1为大于,-1为小于;
    function Set_Updata($t,$v,$w,$p=0)
    {
        $this->Sql($t);
        $v_str="";
        $w_str="";
        $f="";
        foreach($v as $key=>$vaule)
        {
            if(!is_numeric($key))
            {
                if(empty($v_str))
                {
                    $v_str=htmlspecialchars($key)."='".htmlspecialchars($vaule)."'";
                }else
                {
                    $v_str=$v_str.",".htmlspecialchars($key)."='".htmlspecialchars($vaule)."'";
                }
            }
        }
        switch($p)
        {
            case 0:
                $f="=";
                break;
            case 1:
                $f=">";
                break;
            case -1:
                $f="                break;
        }
        if(!empty($f))
        {
            foreach($w as $key=>$vaule)
            {
                if(!is_numeric($key))
                {
                    if(empty($v_str))
                    {
                        $w_str=htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }else
                    {
                        $w_str=$w_str.",".htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }
                }
            }
        }
        $sql="UPDATE ".$t." SET ".$v_str." where ".$w_str;
        return $result = mysql_query($sql);
    }
    //删除一数据$w为条件上标为字段名下标为数据,$p为条件0为等号,1为大于,-1为小于;
    function Set_Del($t,$w,$p=0)
    {
        $this->sub_sql($t);
        $w_str="";
        $f="";
        switch($p)
        {
            case 0:
                $f="=";
                break;
            case 1:
                $f=">";
                break;
            case -1:
                $f="                break;
        }
        if(!empty($f))
        {
            foreach($w as $key=>$vaule)
            {
                if(!is_numeric($key))
                {
                    if(empty($v_str))
                    {
                        $w_str=htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }else
                    {
                        $w_str=$w_str.",".htmlspecialchars($key).$f.htmlspecialchars($vaule)."'";
                    }
                }
            }
        }
        $str="DELETE FROM ".$t." WHERE ".$w_str;
        return $result = mysql_query($str);
    }
    function Add($t,$v)
    {
        $this->sub_sql($t);
        $k_str="";
        $v_str="";
        foreach($v as $key=>$vaule)
        {
            if(!is_numeric($key)){
                if(empty($k_str))
                {
                    $k_str=htmlspecialchars($key);
                    $v_str="'".htmlspecialchars($vaule)."'";
                }else
                {
                    $k_str=$k_str.",".htmlspecialchars($key);
                    $v_str=$v_str.","."'".htmlspecialchars($vaule)."'";
                }
            }
        }
        $str="INSERT INTO ".$t."(".$k_str.")"."value(".$v_str.")";
        return $result = mysql_query($str);
    }
}
?>


www.bkjia.comtruehttp://www.bkjia.com/PHPjc/444651.htmlTechArticle一个不错的PHP mysql操作类 ,分享给大家学习使用。 代码如下 复制代码 ?php //数据库处理类 class db { //SQL执行后的数据保存变量; var $db; //读取...
Stellungnahme:
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn