Yii2数据操作Query Builder详解

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);

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use yii\db\Query;

$query = (new Query())

->from('user')

->orderBy('id');

SELECT

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$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

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$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

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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

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$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

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$query->filterWhere([

'username' => $username,

'email' => $email,

]);

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

ORDER BY

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$query->orderBy([

'id' => SORT_ASC,

'name' => SORT_DESC,

]);

//orderBy , addOrderBy

GROUP BY

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

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

HAVING

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

//having,andHaving,orHaving

LIMIT OR OFFSET

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$query->limit(10);

$query->offset(10);

JOIN

innerJoin()

leftJoin()

rightJoin()

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$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

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$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

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$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

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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

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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

}