下面是获取连接的代码
public static Specification<Item> findByCustomer(User user) {
return (root, criteriaQuery, criteriaBuilder) -> {
root.fetch(User_.address, JoinType.LEFT);
return criteriaBuilder.equal(root.get(User_.id), 1);
};
}
上面的代码正在生成下面的查询
select us.ALL_COLUMN, adr.ALL_COLUMN from User us left outer join Address adr on us.id= adr.id where us.id = 1;
如何在左外连接上添加多个条件。我想使用 spring data jpa 规范生成以下查询。
Select us.ALL_COLUMN, adr.ALL_COLUMN from User us left outer join Address adr on us.id= adr.id and adr.effect_end_date = null where us.id = 1
最佳答案
public static Specification<A> findAbyBname(String input) {
return new Specification<A>() {
@Override
public Predicate toPredicate(Root<A> root, CriteriaQuery<?> cq, CriteriaBuilder cb) {
cq.distinct(true);
Join<A,AB> AjoinAB = root.joinList(A_.AB_LIST,JoinType.LEFT);
Join<AB,B> ABjoinB = AjoinAB.join(AB_.B,JoinType.LEFT);
return cb.equal(ABjoinB.get(B_.NAME),input);
}
};
}
我有这样的东西。以下是实体:
@Entity
public class A {
@Id
private Long id;
private String name;
@OneToMany(mappedBy = "a")
private List<AB> abList;
}
@Entity
public class B {
@Id
private Long id;
private String name;
@OneToMany(mappedBy = "b")
private List<AB> abList;
}
@Entity
public class AB {
@Id
private Long id;
private String name;
@ManyToOne
@JoinColumn(name = "a_id")
private A a;
@ManyToOne
@JoinColumn(name = "b_id")
private B b;
}
关于java - 如何使用ctiteria API spring data JPA规范定义多个Join on条件?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/60000701/