## æ°æ®é
> 模åç`select`æ¥è¯¢æ¹æ³è¿åæ°æ®é对象 `think\model\Collection`ï¼è¯¥å¯¹è±¡ç»§æ¿èª`think\Collection`ï¼å æ¤å
·ææ°æ®åºç[æ°æ®éç±»](æ°æ®é.md)çæææ¹æ³ï¼èä¸è¿æä¾äºé¢å¤ç模åæä½æ¹æ³ã
åºæ¬ç¨æ³åæ°ç»ä¸æ ·ï¼ä¾å¦å¯ä»¥éååç´æ¥è·åæ个å
ç´ ã
~~~
// 模åæ¥è¯¢è¿åæ°æ®é对象
$list = User::where('id', '>', 0)->select();
// è·åæ°æ®éçæ°é
echo count($list);
// ç´æ¥è·åå
¶ä¸çæ个å
ç´
dump($list[0]);
// éåæ°æ®é对象
foreach ($list as $user) {
dump($user);
}
// å é¤æ个å
ç´
unset($list[0]);
~~~
éè¦æ³¨æçæ¯ï¼å¦æè¦å¤ææ°æ®éæ¯å¦ä¸ºç©ºï¼ä¸è½ç´æ¥ä½¿ç¨`empty`å¤æï¼èå¿
须使ç¨æ°æ®é对象ç`isEmpty`æ¹æ³å¤æï¼ä¾å¦ï¼
~~~
$users = User::select();
if($users->isEmpty()){
echo 'æ°æ®é为空';
}
~~~
ä½ å¯ä»¥ä½¿ç¨æ¨¡åç`hidden`/`visible`/`append`/`withAttr`æ¹æ³è¿è¡æ°æ®éçè¾åºå¤çï¼ä¾å¦ï¼
~~~
// 模åæ¥è¯¢è¿åæ°æ®é对象
$list = User::where('id', '>', 0)->select();
// 对è¾åºå段è¿è¡å¤ç
$list->hidden(['password'])
->append(['status_text'])
->withAttr('name', function($value, $data) {
return strtolower($value);
});
dump($list);
~~~
å¦æéè¦å¯¹æ°æ®éçç»æè¿è¡çéï¼å¯ä»¥ä½¿ç¨ï¼
~~~
// 模åæ¥è¯¢è¿åæ°æ®é对象
$list = User::where('id', '>', 0)->select()
->where('name', 'think')
->where('score', '>', 80);
dump($list);
~~~
æ¯æ`whereLike`/`whereIn`/`whereBetween`çå¿«æ·æ¹æ³ã
~~~
// 模åæ¥è¯¢è¿åæ°æ®é对象
$list = User::where('id', '>', 0)->select()
->whereLike('name', 'think%')
->whereBetween('score', [80,100]);
dump($list);
~~~
æ¯ææ°æ®éç`order`æåºæä½ã
~~~
// 模åæ¥è¯¢è¿åæ°æ®é对象
$list = User::where('id', '>', 0)->select()
->where('name', 'think')
->where('score', '>', 80)
->order('create_time','desc');
dump($list);
~~~
æ¯ææ°æ®éç`diff/intersect`æä½ã
~~~
// 模åæ¥è¯¢è¿åæ°æ®é对象
$list1 = User::where('status', 1)->field('id,name')->select();
$list2 = User::where('name', 'like', 'think')->field('id,name')->select();
// 计ç®å·®é
dump($list1->diff($list2));
// 计ç®äº¤é
dump($list1->intersect($list2));
~~~
## æ¹éå é¤åæ´æ°æ°æ®
æ¯æ对æ°æ®éçæ°æ®è¿è¡æ¹éå é¤åæ´æ°æä½ï¼ä¾å¦ï¼
```
$list = User::where('status', 1)->select();
$list->update(['name' => 'php']);
$list = User::where('status', 1)->select();
$list->delete();
```
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