我有一个数据库,其中包含了类型和类别(以及其他无关的内容)。这些类型与类别之间是多对一的关系。我想要选择所有的类型行,首先按照类别名称排序,然后按照类型权重排序,最后按照类型名称排序(全部升序)。关键部分是,我希望具有相同类别的所有类型在结果中被分组在一起。作为SQL新手,我认为一个简单的连接语句加上适当的排序语句就足够了。但是我错了,我得到的结果对我来说毫无意义。
实际结果(类型名称 - 类别名称):
1. Aircraft Landing Strut - Aircraft 2. Aicraft Rotor Blade - Aircraft 3. Aircraft Wing - Aircraft 4. Bicycle Frame - Riding Cycles 5. Boat Bow - Watercraft 6. Boat Cargo Deck - Watercraft 7. Boulder Bottom - Rocks 8. Boulder Top - Rocks 9. Bowed Element - Others 10. Brick 1x1 w/Juice Carton Print - Bricks Printed 11. Brick 1x1 w/Milk Carton Print - Bricks Printed 12. Car Wash Brush Holder - Others 13. [等等]
期望结果(类型名称 - 类别名称):
1. Aircraft Landing Strut - Aircraft 2. Aicraft Rotor Blade - Aircraft 3. Aircraft Wing - Aircraft 4. Brick 1x1 w/Juice Carton Print - Bricks Printed 5. Brick 1x1 w/Milk Carton Print - Bricks Printed 6. Bowed Element - Others 7. Car Wash Brush Holder - Others 8. Bicycle Frame - Riding Cycles 9. Boulder Bottom - Rocks 10. Boulder Top - Rocks 11. Boat Bow - Watercraft 12. Boat Cargo Deck - Watercraft 13. [等等]
总共有超过2000个类型行,因此上述列表显然非常缩略。没有错误。也可能很重要的是,结果被分页(这一点一直运行得非常完美)。
实际结果(类型名称 - 类别名称):
1. Aircraft Landing Strut - Aircraft 2. Aicraft Rotor Blade - Aircraft 3. Aircraft Wing - Aircraft 4. Bicycle Frame - Riding Cycles 5. Boat Bow - Watercraft 6. Boat Cargo Deck - Watercraft 7. Boulder Bottom - Rocks 8. Boulder Top - Rocks 9. Bowed Element - Others 10. Brick 1x1 w/Juice Carton Print - Bricks Printed 11. Brick 1x1 w/Milk Carton Print - Bricks Printed 12. Car Wash Brush Holder - Others 13. [等等]
期望结果(类型名称 - 类别名称):
1. Aircraft Landing Strut - Aircraft 2. Aicraft Rotor Blade - Aircraft 3. Aircraft Wing - Aircraft 4. Brick 1x1 w/Juice Carton Print - Bricks Printed 5. Brick 1x1 w/Milk Carton Print - Bricks Printed 6. Bowed Element - Others 7. Car Wash Brush Holder - Others 8. Bicycle Frame - Riding Cycles 9. Boulder Bottom - Rocks 10. Boulder Top - Rocks 11. Boat Bow - Watercraft 12. Boat Cargo Deck - Watercraft 13. [等等]
总共有超过2000个类型行,因此上述列表显然非常缩略。没有错误。也可能很重要的是,结果被分页(这一点一直运行得非常完美)。
我正在使用Doctrine 2.5.x与我的自己的内容管理系统。在类型实体的存储库中,我使用QueryBuilder
构建查询,如下所示(最大结果是全局设置,第一个结果基于当前页面编号在存储库外计算):
$qb = $this->createQueryBuilder('t');
$qb->select('t, c'); // omitting this does not change the result
$qb->join('t.category', 'c');
$qb->addOrderBy('c.name', 'ASC'); // this does not work as expected
$qb->addOrderBy('t.weight', 'ASC');
$qb->addOrderBy('t.name', 'ASC');
$qb->setMaxResults(20);
$qb->setFirstResult(0);
return $qb->getQuery()->getResult();
生成的 SQL 语句如下:
SELECT b0_.ID AS ID_0, b0_.weight AS weight_1, b0_.name AS name_2, b0_.number AS number_3, b0_.name_alt AS name_alt_4, b0_.note AS note_5, b1_.ID AS ID_12, b1_.slug AS slug_13, b1_.name AS name_14, b1_.`desc` AS desc_15, b0_.cat_id AS cat_id_16 FROM types b0_ INNER JOIN categories b1_ ON b0_.cat_id = b1_.ID ORDER BY b1_.name ASC, b0_.weight ASC, b0_.name ASC LIMIT 20 OFFSET 0
type实体的设置如下(省略了不相关的字段):
/**
* @Entity(repositoryClass="Nevermind\Repository\TypeRepository")
* @Table(name="types", options={"collate"="utf8mb4_unicode_ci", "charset"="utf8mb4"})
*/
class Type {
/**
* @Id
* @Column(type="integer", name="ID")
* @GeneratedValue
*/
protected $id;
/**
* @ManyToOne(targetEntity="Category", inversedBy="types", fetch="EAGER")
* @JoinColumn(name="cat_id", referencedColumnName="ID")
*/
protected $category;
/**
* @Column(type="integer")
*/
protected $weight = 0;
/**
* @Column(type="string", unique=true)
*/
protected $name = '';
/**
* @Column(type="string", unique=true, length=12)
*/
protected $number = '';
/**
* @Column(type="string", nullable=true)
*/
protected $name_alt;
/**
* @Column(type="text", nullable=true)
*/
protected $note;
}
而分类实体的设置如下:
/**
* @Entity(repositoryClass="Nevermind\Repository\DefaultRepository")
* @Table(name="categories", options={"collate"="utf8mb4_unicode_ci", "charset"="utf8mb4"})
*/
class Category {
/**
* @Id
* @Column(type="integer", name="ID")
* @GeneratedValue
*/
protected $id;
/**
* @Column(type="string", unique=true)
*/
protected $slug = '';
/**
* @Column(type="string", nullable=true)
*/
protected $name;
/**
* @Column(type="text", name="`desc`", nullable=true)
*/
protected $desc;
/**
* @OneToMany(targetEntity="Type", mappedBy="category", fetch="EXTRA_LAZY", cascade={"persist", "remove"})
* @OrderBy({"weight"="ASC", "name"="ASC"})
*/
protected $types;
}
TypeRepository
继承DefaultRepository
,而DefaultRepository
又继承了Doctrine的EntityRepository
。
category.slug
就解决了这个问题,因为slug列永远不会为空。感谢您指引我正确的方向! - user11301756