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Yii2 数据操作之Query Builder
Query Builder
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1 $rows = (new \yii\db\Query()) 2 ->select([‘dyn_id‘, ‘dyn_name‘]) 3 ->from(‘zs_dynasty‘) 4 ->where([‘between‘,‘dyn_id‘, 1,30]) 5 ->limit(10) 6 ->all(); 7 print_r($rows);
1 use yii\db\Query; 2 $query = (new Query()) 3 ->from(‘user‘) 4 ->orderBy(‘id‘);
1 $query->select(‘*‘)-> 2 select(‘dyn_id as id, dynasty.dyn_name‘)-> 3 $query->select([‘dyn_id as id‘, "CONCAT(dyn_name,‘a‘)"])-> 4 $query->select(‘user_id‘)->distinct()->
1 $query->from(‘user‘); 2 $query->from([‘public.user u‘, ‘public.post p‘]); 3 $query->from(‘public.user u, public.post p‘); 4 $query->from([‘u‘ => ‘public.user‘, ‘p‘ => ‘public.post‘]); 5 6 7 $subQuery = (new Query())->select(‘id‘)->from(‘user‘)- 8 >where(‘status=1‘); 9 // SELECT * FROM (SELECT `id` FROM `user` WHERE status=1) u 10 $query->from([‘u‘ => $subQuery]);
WHERE
1 where(‘status=1‘)-> 2 where(‘status=:status‘, [‘:status‘ => $status])-> 3 where([ 4 ‘status‘ => 10, 5 ‘type‘ => null, 6 ‘id‘ => [4, 8, 15], 7 ])-> 8 ------- 9 $userQuery = (new Query())->select(‘id‘)->from(‘user‘); 10 // ...WHERE `id` IN (SELECT `id` FROM `user`) 11 $query->...->where([‘id‘ => $userQuery])->... 12 -------- 13 [‘and‘, ‘id=1‘, ‘id=2‘] //id=1 AND id=2 14 [‘and‘, ‘type=1‘, [‘or‘, ‘id=1‘, ‘id=2‘]] //type=1 AND (id=1 OR id=2) 15 [‘between‘, ‘id‘, 1, 10] //id BETWEEN 1 AND 10 16 [‘not between‘, ‘id‘, 1, 10] //not id BETWEEN 1 AND 10 17 [‘in‘, ‘id‘, [1, 2, 3]] //id IN (1, 2, 3) 18 [‘not in‘, ‘id‘, [1, 2, 3]] //not id IN (1, 2, 3) 19 [‘like‘, ‘name‘, ‘tester‘] //name LIKE ‘%tester%‘ 20 [‘like‘, ‘name‘, [‘test‘, ‘sample‘]] //name LIKE ‘%test%‘ AND name LIKE ‘%sample%‘ 21 [‘not like‘, ‘name‘, [‘or‘, ‘test‘, ‘sample‘]] //not name LIKE ‘%test%‘ OR not name LIKE ‘%sample%‘ 22 [‘exists‘,‘id‘, $userQuery] //EXISTS (sub-query) | not exists 23 [‘>‘, ‘age‘, 10] //age>10
ADD WHERE
1 $status = 10; 2 $search = ‘yii‘; 3 $query->where([‘status‘ => $status]); 4 if (!empty($search)) { 5 $query->andWhere([‘like‘, ‘title‘, $search]); 6 } 7 //WHERE (`status` = 10) AND (`title` LIKE ‘%yii%‘) 8 //andWhere() or orWhere()
FILTER WHERE
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$query->filterWhere([ ‘username‘ => $username, ‘email‘ => $email, ]); //如果email为空,则 WHERE username=:username
1 $query->orderBy([ 2 ‘id‘ => SORT_ASC, 3 ‘name‘ => SORT_DESC, 4 ]); 5 //orderBy , addOrderBy
GROUP BY
1 $query->groupBy(‘id, status‘); 2 $query->addGroupBy([‘created_at‘, ‘updated_at‘]);
HAVING
1 $query->having([‘status‘ => $status]); 2 //having,andHaving,orHaving
1 $query->limit(10); 2 $query->offset(10);
- innerJoin()
- leftJoin()
- rightJoin()
1 $query->select([‘user.name AS author‘, ‘post.title as title‘]) 2 ->from(‘user‘) 3 ->leftJoin(‘post‘, ‘post.user_id = user.id‘); 4 $query->join(‘FULL OUTER JOIN‘, ‘post‘, ‘post.user_id = user.id‘); 5 $query->leftJoin([‘u‘ => $subQuery], ‘u.id=author_id‘);
1 $query = new Query(); 2 $query->select("id, category_id as type, name")->from(‘post‘)->limit(10); 3 $anotherQuery = new Query(); 4 $anotherQuery->select(‘id, type, name‘)->from(‘user‘)->limit(10); 5 $query->union($anotherQuery);
QUERY METHODS
- all() //所有行列
- one() //第一行
- column() //第一列
- scalar() //第一行第一列
- exists() //是否有结果存在
- count() //记录数量
- sum($q), average($q), max($q), min($q) //$q 为字段或表达式
1 $count = (new \yii\db\Query()) 2 ->from(‘user‘) 3 ->where([‘last_name‘ => ‘Smith‘]) 4 ->count(); 5 //SELECT COUNT(*) FROM `user` WHERE `last_name`=:last_name 6 7 8 $command = (new \yii\db\Query()) 9 ->select([‘id‘, ‘email‘]) 10 ->from(‘user‘) 11 ->where([‘last_name‘ => ‘Smith‘]) 12 ->limit(10) 13 ->createCommand(); 14 15 // show the SQL statement 16 echo $command->sql; 17 // show the parameters to be bound 18 print_r($command->params); 19 20 21 // returns all rows of the query result 22 $rows = $command->queryAll();
QUERY RESULTS
1 use yii\db\Query; 2 $query = (new Query()) 3 ->from(‘user‘) 4 ->indexBy(‘username‘); 5 foreach ($query->batch() as $users) { 6 // $users is indexed by the "username" column 7 } 8 foreach ($query->each() as $username => $user) { 9 }
INDEXING
1 use yii\db\Query; 2 $query = (new Query()) 3 ->from(‘user‘) 4 ->orderBy(‘id‘); 5 foreach ($query->batch() as $users) { 6 // batch( $batchSize = 100, $db = null ) 7 // 一个批次取100行 8 } 9 foreach ($query->each() as $user) { 10 // 一行一行取 11 }
Yii2 数据操作之Query Builder
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