嗨我有两个表,联系人和标签之间的M:M关系,他们的M:M表叫做Contacts_Tags:
Contacts
------------
ID
Name
Tags
-----------
ID
Name
Contacts_Tags
--------------
Contact_ID
Tag_ID
我有名为Contact
的联系人实体和名为Tag
的标签,但不包括Contacts_Tags表。
我想离开加入查询生成器
$queryBuilder = $this->entityManager->getRepository(Contact::class)->createQueryBuilder("o")->select("o");
$queryBuilder->leftJoin(//here, "et", "WITH", "et.Contact_ID = o.ID")
->leftJoin(Tag::class, "t", "WITH", "t.ID = et.Tag_ID")
;
但我无法弄清楚如何添加它。我尝试过文档,但是当我添加ContactTag
实体时它会添加实体,它会抛出实体应该有主键的错误。
任何的想法?
要做左连接:
$queryBuilder->join(table, condition, columns, $queryBuilder::JOIN_LEFT);
with :
table is the name of a table or another Select or array [alias => table]
condition is a string (the same as in Sql language)
columns is an array like [alias => column_name, ...] or [column_name, ...], may be empty
$queryBuilder is a Select, can be replaced by \Zend\Sql\Select::JOIN_LEFT