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æé åæ¥è¯¢SQLï¼å¯ä»¥ä½¿ç¨ä¸é¢ä¸ç§çæ¹å¼æ¥æ建åæ¥è¯¢ã
## 使ç¨`fetchSql`æ¹æ³
fetchSqlæ¹æ³è¡¨ç¤ºä¸è¿è¡æ¥è¯¢èåªæ¯è¿åæ建çSQLè¯å¥ï¼å¹¶ä¸ä¸ä»
ä»
æ¯æ`select`ï¼èæ¯æ¯æææçCURDæ¥è¯¢ã
~~~
$subQuery = Db::table('think_user')
->field('id,name')
->where('id', '>', 10)
->fetchSql(true)
->select();
~~~
çæçsubQueryç»æ为ï¼
~~~sql
SELECT `id`,`name` FROM `think_user` WHERE `id` > 10
~~~
## 使ç¨`buildSql`æé åæ¥è¯¢
~~~
$subQuery = Db::table('think_user')
->field('id,name')
->where('id', '>', 10)
->buildSql();
~~~
çæçsubQueryç»æ为ï¼
~~~sql
( SELECT `id`,`name` FROM `think_user` WHERE `id` > 10 )
~~~
è°ç¨`buildSql`æ¹æ³åä¸ä¼è¿è¡å®é
çæ¥è¯¢æä½ï¼èåªæ¯çæ该次æ¥è¯¢çSQLè¯å¥ï¼ä¸ºäºé¿å
æ··æ·ï¼ä¼å¨SQL两边å ä¸æ¬å·ï¼ï¼ç¶åæ们ç´æ¥å¨åç»çæ¥è¯¢ä¸ç´æ¥è°ç¨ã
ç¶å使ç¨åæ¥è¯¢æé æ°çæ¥è¯¢ï¼
~~~
Db::table($subQuery . ' a')
->where('a.name', 'like', 'thinkphp')
->order('id', 'desc')
->select();
~~~
çæçSQLè¯å¥ä¸ºï¼
~~~sql
SELECT * FROM ( SELECT `id`,`name` FROM `think_user` WHERE `id` > 10 ) a WHERE a.name LIKE 'thinkphp' ORDER BY `id` desc
~~~
## 使ç¨éå
æé åæ¥è¯¢
`IN/NOT IN`å`EXISTS/NOT EXISTS`ä¹ç±»çæ¥è¯¢å¯ä»¥ç´æ¥ä½¿ç¨éå
ä½ä¸ºåæ¥è¯¢ï¼ä¾å¦ï¼
~~~
Db::table('think_user')
->where('id', 'IN', function ($query) {
$query->table('think_profile')->where('status', 1)->field('id');
})
->select();
~~~
çæçSQLè¯å¥æ¯
~~~sql
SELECT * FROM `think_user` WHERE `id` IN ( SELECT `id` FROM `think_profile` WHERE `status` = 1 )
~~~
~~~
Db::table('think_user')
->whereExists(function ($query) {
$query->table('think_profile')->where('status', 1);
})->find();
~~~
çæçSQLè¯å¥ä¸º
~~~
SELECT * FROM `think_user` WHERE EXISTS ( SELECT * FROM `think_profile` WHERE `status` = 1 )
~~~
> é¤äºä¸è¿°æ¥è¯¢æ¡ä»¶å¤ï¼æ¯è¾è¿ç®ä¹æ¯æ使ç¨éå
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