Java Hibernate条件无法检索联接的值
我有以下实体,需要检索特定组中且在特定城市有分支机构的所有商店的名称列表。我发现的大多数教程和文章都与创建这种类型的关系有关,但没有一篇是关于检索的 我多次更改了标准,但Hibernate为每个标准显示了不同的错误。代码的注释部分是我尝试过的部分,相应的抛出异常也写在每个代码前面 实体Java Hibernate条件无法检索联接的值,java,mysql,hibernate,hibernate-criteria,Java,Mysql,Hibernate,Hibernate Criteria,我有以下实体,需要检索特定组中且在特定城市有分支机构的所有商店的名称列表。我发现的大多数教程和文章都与创建这种类型的关系有关,但没有一篇是关于检索的 我多次更改了标准,但Hibernate为每个标准显示了不同的错误。代码的注释部分是我尝试过的部分,相应的抛出异常也写在每个代码前面 实体 @Entity public class Store { @Id String id; String name; @JoinTable(name = "store_groups",
@Entity
public class Store {
@Id
String id;
String name;
@JoinTable(name = "store_groups", joinColumns = { @JoinColumn(name = "id", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "code", nullable = false, updatable = false) })
private Set<Group> groups = new HashSet<Group>(0);
private Set<StoreAddress> storeAddresses = new HashSet<StoreAddress>(0);
....
}
@Entity
public class Group {
@Id
String code;
@Column(nullable = false, unique = true)
String name;
@ManyToMany(fetch = FetchType.LAZY, mappedBy = "groups")
Set<Store> storees = new HashSet<Store>(0);
}
@Entity
@Table(name = "StoreAddresses")
@AssociationOverrides({
@AssociationOverride(name = "muJoinTable.store", joinColumns = @JoinColumn(name = "id", nullable = false)),
@AssociationOverride(name = "myJoinTable.city", joinColumns = @JoinColumn(name = "cityCode", nullable = false)) })
public class StoreAddress {
@EmbeddedId
private StoreCitysId myJoinTable = new StoreCitysId();
...
}
@Embeddable
public class StoreCitysId {
@ManyToOne
private Store store;
@ManyToOne
private City city;
}
@Entity
public class City {
@Id
short code;
@Column(nullable = false)
String name;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "myJoinTable.city")
private Set<StoreAddress> storeAddresses = new HashSet<StoreAddress>(
0);
}
@实体
公共类商店{
@身份证
字符串id;
字符串名;
@JoinTable(name=“store_groups”,joinColumns={@JoinColumn(name=“id”,nullable=false,updateable=false)},inverseJoinColumns={@JoinColumn(name=“code”,nullable=false,updateable=false)})
私有集组=新哈希集(0);
私有集storeAddresses=新哈希集(0);
....
}
@实体
公共课组{
@身份证
字符串代码;
@列(nullable=false,unique=true)
字符串名;
@ManyToMany(fetch=FetchType.LAZY,mappedBy=“groups”)
Set storees=新哈希集(0);
}
@实体
@表(name=“StoreAddresses”)
@联想超越({
@AssociationOverride(name=“muJoinTable.store”,joinColumns=@JoinColumn(name=“id”,nullable=false)),
@AssociationOverride(name=“myJoinTable.city”,joinColumns=@JoinColumn(name=“cityCode”,nullable=false)))
公共类存储地址{
@嵌入ID
private StoreCitysId myJoinTable=新的StoreCitysId();
...
}
@可嵌入
公共类StoreCitysId{
@许多酮
私人店铺;
@许多酮
私人城市;
}
@实体
公营城市{
@身份证
短代码;
@列(nullable=false)
字符串名;
@OneToMany(fetch=FetchType.LAZY,mappedBy=“myJoinTable.city”)
私有集storeAddresses=新哈希集(
0);
}
标准
List<String> storees = (List<String>) sessionFactory
.getCurrentSession()
.createCriteria(Store.class)
.setProjection(
Projections.property("name").as(
"storeName"))
.createAlias("groups", "group")
.createAlias("storeAddresses", "address")
// .createAlias("address.myJoinTable.city", "city")
// .createAlias("address.myJoinTable", "myJoinTable")
// .createAlias("myJoinTable.city", "city") Error: Criteria objects cannot be created directly on components
.setFetchMode("group", FetchMode.JOIN)
.add(Restrictions.ilike("group.code", store))
.add(Restrictions.eq("address.myJoinTable.cityCode",
1)).list(); //city.code -> Error: could not resolve property: cityCode of:com.example.entity.StoreAddress address.myJoinTable.cityCode could not resolve property: myJoinTable.cityCode of:com.example.entity.StoreAddress
List storees=(List)sessionFactory
.getCurrentSession()
.createCriteria(Store.class)
.setProjection(
物业(“名称”)。作为(
“店名”))
.createAlias(“组”、“组”)
.createAlias(“存储地址”、“地址”)
//.createAlias(“address.myJoinTable.city”,“city”)
//.createAlias(“address.myJoinTable”,“myJoinTable”)
//.createAlias(“myJoinTable.city”、“city”)错误:无法直接在组件上创建条件对象
.setFetchMode(“组”,FetchMode.JOIN)
.add(Restrictions.ilike(“group.code”,store))
.add(Restrictions.eq(“address.myJoinTable.cityCode”),
1) )。列表()//city.code->错误:无法解析属性:cityCode of:com.example.entity.StoreAddress.myJoinTable.cityCode无法解析属性:myJoinTable.cityCode of:com.example.entity.StoreAddress
您的标准限制。eq(“address.myJoinTable.cityCode”,1)
不引用属性,而是引用列的名称。您可以改为使用address.myJoinTable.city
并将值设置为session.load(city.class,1)
makingRestrictions.eq(“address.myJoinTable.city”,session.load(city.class,1))
这是:
.createAlias("address.myJoinTable", "myJoinTable")
.createAlias("myJoinTable.city", "city")
应该是:
.createAlias("address.myJoinTable.city", "city")