Yii2数据操作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');

$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()->

$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('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

$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()

$query->filterWhere([

    'username' => $username,

    'email' => $email,

]);

//如果email为空,则 WHERE username=:username

$query->orderBy([

    'id' => SORT_ASC,

    'name' => SORT_DESC,

]);

//orderBy , addOrderBy

$query->groupBy('id, status');

$query->addGroupBy(['created_at', 'updated_at']);

$query->having(['status' => $status]);

//having,andHaving,orHaving

$query->limit(10);

$query->offset(10);

• 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');

$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);

• 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();

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) {

}

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

}