Query Builder
- $rows = (new \yii\db\Query())
- ->select(['dyn_id', 'dyn_name'])
- ->from('zs_dynasty')
- ->where(['between','dyn_id', 1,30])
- ->limit(10)
- ->all();
- print_r($rows);
- use yii\db\Query;
- $query = (new Query())
- ->from('user')
- ->orderBy('id');
SELECT
- $query->select('*')->
- select('dyn_id as id, dynasty.dyn_name')->
- $query->select(['dyn_id as id', "CONCAT(dyn_name,'a')"])->
- $query->select('user_id')->distinct()->
FORM
- $query->from('user');
- $query->from(['public.user u', 'public.post p']);
- $query->from('public.user u, public.post p');
- $query->from(['u' => 'public.user', 'p' => 'public.post']);
- ----------
- $subQuery = (new Query())->select('id')->from('user')->where('status=1');
- // SELECT * FROM (SELECT `id` FROM `user` WHERE status=1) u
- $query->from(['u' => $subQuery]);
WHERE
- where('status=1')->
- where('status=:status', [':status' => $status])->
- where([
- 'status' => 10,
- 'type' => null,
- 'id' => [4, 8, 15],
- ])->
- -------
- $userQuery = (new Query())->select('id')->from('user');
- // ...WHERE `id` IN (SELECT `id` FROM `user`)
- $query->...->where(['id' => $userQuery])->...
- --------
- ['and', 'id=1', 'id=2'] //id=1 AND id=2
- ['and', 'type=1', ['or', 'id=1', 'id=2']] //type=1 AND (id=1 OR id=2)
- ['between', 'id', 1, 10] //id BETWEEN 1 AND 10
- ['not between', 'id', 1, 10] //not id BETWEEN 1 AND 10
- ['in', 'id', [1, 2, 3]] //id IN (1, 2, 3)
- ['not in', 'id', [1, 2, 3]] //not id IN (1, 2, 3)
- ['like', 'name', 'tester'] //name LIKE '%tester%'
- ['like', 'name', ['test', 'sample']] //name LIKE '%test%' AND name LIKE '%sample%'
- ['not like', 'name', ['or', 'test', 'sample']] //not name LIKE '%test%' OR not name LIKE '%sample%'
- ['exists','id', $userQuery] //EXISTS (sub-query) | not exists
- ['>', 'age', 10] //age>10
ADD WHERE
- $status = 10;
- $search = 'yii';
- $query->where(['status' => $status]);
- if (!empty($search)) {
- $query->andWhere(['like', 'title', $search]);
- }
- //WHERE (`status` = 10) AND (`title` LIKE '%yii%')
- //andWhere() or orWhere()
FILTER WHERE
- $query->filterWhere([
- 'username' => $username,
- 'email' => $email,
- ]);
- //如果email为空,则 WHERE username=:username
ORDER BY
- $query->orderBy([
- 'id' => SORT_ASC,
- 'name' => SORT_DESC,
- ]);
- //orderBy , addOrderBy
GROUP BY
- $query->groupBy('id, status');
- $query->addGroupBy(['created_at', 'updated_at']);
HAVING
- $query->having(['status' => $status]);
- //having,andHaving,orHaving
LIMIT OR OFFSET
- innerJoin()
- leftJoin()
- rightJoin()
- $query->select(['user.name AS author', 'post.title as title'])
- ->from('user')
- ->leftJoin('post', 'post.user_id = user.id');
- $query->join('FULL OUTER JOIN', 'post', 'post.user_id = user.id');
- $query->leftJoin(['u' => $subQuery], 'u.id=author_id');
UNION
- $query = new Query();
- $query->select("id, category_id as type, name")->from('post')->limit(10);
- $anotherQuery = new Query();
- $anotherQuery->select('id, type, name')->from('user')->limit(10);
- $query->union($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
- $count = (new \yii\db\Query())
- ->from('user')
- ->where(['last_name' => 'Smith'])
- ->count();
- //SELECT COUNT(*) FROM `user` WHERE `last_name`=:last_name
- $command = (new \yii\db\Query())
- ->select(['id', 'email'])
- ->from('user')
- ->where(['last_name' => 'Smith'])
- ->limit(10)
- ->createCommand();
- // show the SQL statement
- echo $command->sql;
- // show the parameters to be bound
- print_r($command->params);
- // returns all rows of the query result
- $rows = $command->queryAll();
QUERY RESULTS
- use yii\db\Query;
- $query = (new Query())
- ->from('user')
- ->indexBy('username');
- foreach ($query->batch() as $users) {
- // $users is indexed by the "username" column
- }
- foreach ($query->each() as $username => $user) {
- }
INDEXING
- use yii\db\Query;
- $query = (new Query())
- ->from('user')
- ->orderBy('id');
- foreach ($query->batch() as $users) {
- // batch( $batchSize = 100, $db = null )
- // 一个批次取100行
- }
- foreach ($query->each() as $user) {
- // 一行一行取
- }