查询语言 PHQL
2018-10-21 07:12 更新
Phalcon查询语言,PhalconQL或者简单的称之为PHQL,是一种面向对象的高级SQL语言,允许使用标准化的SQL编写操作语句。 PHQL实现了一个解析器(C编写)来把操作语句解析成RDBMS的语法。
为了达到高性能,Phalcon实现了一个和 SQLite 中相似的解析器。它只占用了非常低的内存,同时也是线程安全的。
使用 PHQL 会自动通过模型检测查字段信息,作出简单的验证。使用查询构建器创建查询
使用查询构建器,我们就不需要书写 PHQL 语句了。
选取查询构建器
<?php // Create a new Query Builder for Select $robots = $this->modelsManager->createBuilder(); // Or $builder = Phalcon\Mvc\Model\Query\Builder::create(Phalcon\Mvc\Model\Query::TYPE_SELECT); // Or $builder = Phalcon\Mvc\Model\Query\Builder::createSelectBuilder(); // Getting a whole set $builder->from('Robots') ->join('RobotsParts') ->orderBy('Robots.name') ->getQuery() ->execute(); // Getting the first row $builder->from('Robots') ->join('RobotsParts') ->orderBy('Robots.name') ->getQuery() ->getSingleResult();
效果和下面的代码一样:
<?php $phql = "SELECT Robots.* FROM Robots JOIN RobotsParts p ORDER BY Robots.name LIMIT 20"; $result = $manager->executeQuery($phql);
更多的例子:
<?php // 'SELECT Robots.* FROM Robots'; $builder->from('Robots'); // 'SELECT Robots.*, RobotsParts.* FROM Robots, RobotsParts'; $builder->from( array( 'Robots', 'RobotsParts' ) ); // 'SELECT * FROM Robots'; $phql = $builder->columns('*') ->from('Robots'); // 'SELECT id FROM Robots'; $builder->columns('id') ->from('Robots'); // 'SELECT id, name FROM Robots'; $builder->columns(array('id', 'name')) ->from('Robots'); // 'SELECT Robots.* FROM Robots WHERE Robots.name = "Voltron"'; $builder->from('Robots') ->where('Robots.name = "Voltron"'); // 'SELECT Robots.* FROM Robots WHERE Robots.id = 100'; $builder->from('Robots') ->where(100); // 'SELECT Robots.* FROM Robots WHERE Robots.type = "virtual" AND Robots.id > 50'; $builder->from('Robots') ->where('type = "virtual"') ->andWhere('id > 50'); // 'SELECT Robots.* FROM Robots WHERE Robots.type = "virtual" OR Robots.id > 50'; $builder->from('Robots') ->where('type = "virtual"') ->orWhere('id > 50'); // 'SELECT Robots.* FROM Robots GROUP BY Robots.name'; $builder->from('Robots') ->groupBy('Robots.name'); // 'SELECT Robots.* FROM Robots GROUP BY Robots.name, Robots.id'; $builder->from('Robots') ->groupBy(array('Robots.name', 'Robots.id')); // 'SELECT Robots.name, SUM(Robots.price) FROM Robots GROUP BY Robots.name'; $builder->columns(array('Robots.name', 'SUM(Robots.price)')) ->from('Robots') ->groupBy('Robots.name'); // 'SELECT Robots.name, SUM(Robots.price) FROM Robots GROUP BY Robots.name HAVING SUM(Robots.price) > 1000'; $builder->columns(array('Robots.name', 'SUM(Robots.price)')) ->from('Robots') ->groupBy('Robots.name') ->having('SUM(Robots.price) > 1000'); // 'SELECT Robots.* FROM Robots JOIN RobotsParts'; $builder->from('Robots') ->join('RobotsParts'); // 'SELECT Robots.* FROM Robots JOIN RobotsParts AS p'; $builder->from('Robots') ->join('RobotsParts', null, 'p'); // 'SELECT Robots.* FROM Robots JOIN RobotsParts ON Robots.id = RobotsParts.robots_id AS p'; $builder->from('Robots') ->join('RobotsParts', 'Robots.id = RobotsParts.robots_id', 'p'); // 'SELECT Robots.* FROM Robots // JOIN RobotsParts ON Robots.id = RobotsParts.robots_id AS p // JOIN Parts ON Parts.id = RobotsParts.parts_id AS t'; $builder->from('Robots') ->join('RobotsParts', 'Robots.id = RobotsParts.robots_id', 'p') ->join('Parts', 'Parts.id = RobotsParts.parts_id', 't'); // 'SELECT r.* FROM Robots AS r'; $builder->addFrom('Robots', 'r'); // 'SELECT Robots.*, p.* FROM Robots, Parts AS p'; $builder->from('Robots') ->addFrom('Parts', 'p'); // 'SELECT r.*, p.* FROM Robots AS r, Parts AS p'; $builder->from(array('r' => 'Robots')) ->addFrom('Parts', 'p'); // 'SELECT r.*, p.* FROM Robots AS r, Parts AS p'; $builder->from(array('r' => 'Robots', 'p' => 'Parts')); // 'SELECT Robots.* FROM Robots LIMIT 10'; $builder->from('Robots') ->limit(10); // 'SELECT Robots.* FROM Robots LIMIT 10 OFFSET 5'; $builder->from('Robots') ->limit(10, 5); // 'SELECT Robots.* FROM Robots WHERE id BETWEEN 1 AND 100'; $builder->from('Robots') ->betweenWhere('id', 1, 100); // 'SELECT Robots.* FROM Robots WHERE id IN (1, 2, 3)'; $builder->from('Robots') ->inWhere('id', array(1, 2, 3)); // 'SELECT Robots.* FROM Robots WHERE id NOT IN (1, 2, 3)'; $builder->from('Robots') ->notInWhere('id', array(1, 2, 3)); // 'SELECT Robots.* FROM Robots WHERE name LIKE '%Art%'; $builder->from('Robots') ->where('name LIKE :name:', array('name' => '%' . $name . '%')); // 'SELECT r.* FROM Store\Robots WHERE r.name LIKE '%Art%'; $builder->from(['r' => 'Store\Robots']) ->where('r.name LIKE :name:', array('name' => '%' . $name . '%'));
插入查询构建器
<?php // Create a new Query Builder for Insert $robots = $this->modelsManager->createBuilder(NULL, Phalcon\Mvc\Model\Query::TYPE_INSERT); // Or $builder = Phalcon\Mvc\Model\Query\Builder::create(Phalcon\Mvc\Model\Query::TYPE_INSERT); // Or $builder = Phalcon\Mvc\Model\Query\Builder::createInsertBuilder(); // Insert two records $builder->table('Robots') ->columns(array('name')) ->values(array(array('name' => 'Google'), array('name' => 'Baidu'))) ->getQuery() ->execute();
更新查询构建器
<?php // Create a new Query Builder for Update $robots = $this->modelsManager->createBuilder(NULL, Phalcon\Mvc\Model\Query::TYPE_UPDATE); // Or $builder = Phalcon\Mvc\Model\Query\Builder::create(Phalcon\Mvc\Model\Query::TYPE_UPDATE); // Or $builder = Phalcon\Mvc\Model\Query\Builder::createUpdateBuilder(); // Update records $builder->table('Robots') ->set(array('name' => 'Google')) ->getQuery() ->execute();
删除查询构建器
<?php // Create a new Query Builder for Delete $robots = $this->modelsManager->createBuilder(NULL, Phalcon\Mvc\Model\Query::TYPE_DELETE); // Or $builder = Phalcon\Mvc\Model\Query\Builder::create(Phalcon\Mvc\Model\Query::TYPE_DELETE); // Or $builder = Phalcon\Mvc\Model\Query\Builder::createDeleteBuilder(); // Delete records $builder->table('Robots') ->where('name = "Peter"') ->orderBy('Robots.id') ->limit(20) ->getQuery() ->execute();
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