尊龙凯时人生就是搏

thinkphp5̽ÌÖÔõÑùÅжÏMQL¹¤¾ßÊÇ·ñΪ¿Õ

ÔÚʹÓÃthinkphp5ÖеÄmql¹¤¾ßʱ £¬ÎÒÃÇÓÐʱÐèÒªÅжÏÕâ¸ö¹¤¾ßÊÇ·ñΪ¿Õ¡£±¾ÎĽ«Ì½ÌÖÔõÑùÅжÏmql¹¤¾ßÊÇ·ñΪ¿Õ¡£

ʲôÊÇMQL¹¤¾ß

MQL£¨Model Query Language£©¹¤¾ßÊÇThinkPHP5Öлù´¡Ä£×ÓÀàQueryµÄʵÀý £¬ËüÓÃÓÚ¹¹½¨Êý¾Ý¿âµÄÅÌÎÊÌõ¼þºÍ²Ù×÷¡£

ÔÚThinkPHP5ÖÐÿ¸öÄ£×Ó¶¼ÓÐÒ»¸öĬÈϵÄMQL¹¤¾ß £¬ÎÒÃÇ¿ÉÒÔͨ¹ýÄ£×ӵľ²Ì¬ÒªÁì»ñµÃÕâ¸ö¹¤¾ß £¬È磺

$userModel = new \app\user\model\UserModel;
$userModel->where('username', 'like', '%admin%')->select();

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$userModel = \app\user\model\UserModel::where('username', 'like', '%admin%')->select();

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ÅжÏMQL¹¤¾ßÊÇ·ñΪ¿Õ

ÔÚ²Ù×÷Êý¾Ý¿âʱ £¬ÎÒÃÇÓÐʱ»áÓöµ½ÅÌÎÊЧ¹ûΪ¿ÕµÄÇéÐÎ £¬ÕâʱÎÒÃÇÐèÒªÅжÏMQL¹¤¾ßÊÇ·ñΪ¿Õ¡£ÅжÏÒªÁìÓÐÒÔϼ¸ÖÖ£º

ͨ¹ýcount()ÒªÁìÅжÏ

MQL¹¤¾ßÌṩÁËcount()ÒªÁì £¬ÓÃÓÚÅÌÎÊÇкÏÌõ¼þµÄ¼Í¼ÊýÄ¿¡£ÈôÊÇ·µ»ØµÄ¼Í¼ÊýĿΪ0 £¬Ôò˵Ã÷MQL¹¤¾ßΪ¿Õ¡£

$userModel = \app\user\model\UserModel::where('username', 'like', '%notexist%');
if($userModel->count() == 0){
    echo 'MQL¹¤¾ßΪ¿Õ';
}

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ͨ¹ýfind()ÒªÁìÅжÏ

MQL¹¤¾ßÌṩÁËfind()ÒªÁì £¬ÓÃÓÚÅÌÎÊÇкÏÌõ¼þµÄµÚÒ»Ìõ¼Í¼¡£ÈôÊÇ·µ»ØµÄЧ¹ûΪnull £¬Ôò˵Ã÷MQL¹¤¾ßΪ¿Õ¡£

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$userModel = \app\user\model\UserModel::where('username', 'like', '%notexist%')->find();
if(is_null($userModel)){
    echo 'MQL¹¤¾ßΪ¿Õ';
}

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ͨ¹ýselect()ÒªÁìÅжÏ

MQL¹¤¾ßÌṩÁËselect()ÒªÁì £¬ÓÃÓÚÅÌÎÊÇкÏÌõ¼þµÄËùÓмͼ¡£ÈôÊÇ·µ»ØµÄЧ¹ûΪ¿ÕÊý×é £¬Ôò˵Ã÷MQL¹¤¾ßΪ¿Õ¡£

$userModel = \app\user\model\UserModel::where('username', 'like', '%notexist%')->select();
if(empty($userModel)){
    echo 'MQL¹¤¾ßΪ¿Õ';
}

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ͨ¹ýisEmpty()ÒªÁìÅжÏ

MQL¹¤¾ßÌṩÁËisEmpty()ÒªÁì £¬ÓÃÓÚÅжÏMQL¹¤¾ßÊÇ·ñΪ¿Õ¡£ÈôÊÇ·µ»ØЧ¹ûΪtrue £¬Ôò˵Ã÷MQL¹¤¾ßΪ¿Õ¡£

$userModel = \app\user\model\UserModel::where('username', 'like', '%notexist%');
if($userModel->isEmpty()){
    echo 'MQL¹¤¾ßΪ¿Õ';
}

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