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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