Can I have a relationship as below:
#Entity Table1{
#ManyToOne
#JoinColumn(name = "Column1",
referencedColumnName = "t2id",
insertable = false,
updatable = false)
private Table2 table2_col;
#ManyToOne
#JoinColumn(name = "Column1",
referencedColumnName = "t3id",
insertable = false,
updatable = false)
private Table3 table3_col;
}
Yes, the mapping looks valid.
The column Column1 in both cases belong to different tables (Table2.column1 and Table3.column1). So I don't see any collision here. It is not the case as the tittle says "one column references to two other columns".
In this case you have two many-to-one relations: Table1<--->Table2 and Table1<--->Table3. So the column1 in both tables (2 and 3) is a Foreign Key to the Table1. So you have 2 different foreign keys.
Related
I had a db with tables SPEC and PARTS.Also I had a table for MANY TO MANY relations. In my project I used spring jdbs template and all works good. Then I decide to change jdbc on SPring data jpa.
My Entities:
#Entity
#Table(name = "PARTS")
public class PartsJpa {
#Id
private int id;
#Column(name = "NAME")
private String name;
#OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name = "ID_EXPORT", unique = false, nullable = false, updatable = true)
private ExportJpa exportJpa;
#OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name = "ID_TYPE", unique = false, nullable = false, updatable = true)
private TypesJpa typesJpa;
#Column(name = "DESCRIPTION")
private String description;
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name="SPEC_PARTS",
joinColumns = #JoinColumn(name="ID_SPEC", referencedColumnName="id"),
inverseJoinColumns = #JoinColumn(name="ID_PARTS", referencedColumnName="id")
)
private Set<SpecJpa> specJpa;
////////
}
And Spec:
#Entity
#Table(name = "SPEC")
public class SpecJpa {
#Id
private int id;
#Column(name = "NAME")
private String name;
#OneToOne(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
#JoinColumn(name = "Creator_ID", unique = false, nullable = false, updatable = true)
private UsersJpa usersJpa;
#Column(name = "DESCRIPTION")
private String description;
#ManyToMany(fetch = FetchType.EAGER)
#JoinTable(name="SPEC_PARTS",
joinColumns = #JoinColumn(name="ID_SPEC", referencedColumnName="id"),
inverseJoinColumns = #JoinColumn(name="ID_PARTS", referencedColumnName="id")
)
private Set<PartsJpa> partsJpa;
////////////////
}
I don't show getters and setters.
It works, but when I start a programm, something in my table was changed and now I can't add in table spec_parts values like(1,3)(1,2).
Mistake:
FK_123: PUBLIC.SPEC_PARTS FOREIGN KEY(ID_PARTS) REFERENCES PUBLIC.SPEC(ID) (3)" Referential integrity constraint violation: "FK_123: PUBLIC.SPEC_PARTS FOREIGN KEY(ID_PARTS) REFERENCES PUBLIC.SPEC(ID) (3)"; SQL statement: INSERT INTO "PUBLIC"."SPEC_PARTS"("ID_SPEC","ID_PARTS")VALUES(?,?)
Maybe I have mistake with creating relations between spec and parts? What problem it can be?
data in spec
ID NAME CREATOR_ID DESCRIPTION CHANGER_ID
1 pc 1 description 1
2 pc2 2 description2 2
data in parts
ID ▼ NAME ID_EXPORT ID_TYPE DESCRIPTION
1 intel core i5 1 1 d1
2 intel core i7 1 1 d2
3 ddr3 2 2 d3
4 ddr4 2 2 d4
5 asus 3 3 d5
data in spec_parts now:
ID_SPEC ID_PARTS
1 1
2 2
so I can't add 1,3 or 2,4
I find a problem, spring date change something and now in table SPEC_PARTS ID_SPEC mapping on PARTS.ID. Why?
As you are using ManyToMany relation, there is a mapping table created named SPEC_PARTS which have referenced columns ID_SPEC and ID_PARTS.These columns value come from SPEC.ID and PARTS.ID. So you can't insert in SPEC_PARTS without creating referenced value because you are trying to do foreign key constraint violation.
Suppose if there is a row in SPEC with id value 1 and there is a row in PARTS with id value 2. Then you can insert in SPEC_PARTS with value like (1,2).
So, first, add data in SPEC and PARTS then map them in SPEC_PARTS.
And you can remove #JoinTable from one side, you don't need to define it both side.
Update:
Problem is SpecJpa class relation. Here you are using SPEC_PARTS.ID_SPEC as foriegn key for PARTS.ID and SPEC_PARTS.ID_PARTS as foriegn key for SPEC.ID which is fully reversed what you do in PartsJpa class.
#JoinTable(name="SPEC_PARTS",
joinColumns = #JoinColumn(name="ID_SPEC", referencedColumnName="id"),
inverseJoinColumns = #JoinColumn(name="ID_PARTS", referencedColumnName="id")
)
That's why this error say
SPEC_PARTS FOREIGN KEY(ID_PARTS) REFERENCES PUBLIC.SPEC(ID) (3)";
There is no SPEC.ID value 3 exist in the database.
Solution:
Remove #JoinTable from SpecJpa class as you don't need to specify both side.
And remove the wrong relation of the foreign key from database also.
I am having below annotation on column in my entity class.
#OneToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "INQUIRYID", referencedColumnName="ID", updatable=false, insertable=false)
private MyTable myInquiry;
It was giving below error on runtime.
column with logical name ID not found in entity class
As the referenced column is a primary key, I removed the referencedColumnName attribute and updated to below
#OneToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "INQUIRYID", updatable=false, insertable=false)
private MyTable myInquiry;
This works perfectly with Hibernate 5.3 but as soon as I go to hibernate 4 , I see some anomalies.
In hibernate 5 I get this issue only with columns which are referring some ID(PK) of another class. However, in hibernate 4 I see this error for non-pk columns as well.
I start to get the same error for columns which are referring non primary keys.
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "AB", referencedColumnName = "AB")
private MyTable someData;
Above code gives me error in hibernate 4
Column with logical name AB not found in entity class.
Here, AB is a non primary key column .So I can't remove referencedColumnName attribute.
Is it purely because of hibernate version or there is a different reason for such behavior ?
Referred this : Similar Issue
There is a bug for hibernate 4.1.7
A workaround for this issue is surrounding the column name with gave accents.
Unable to find column with logical name: id in
org.hibernate.mapping.Table(template) and its related supertables and
secondary tables
#ManyToOne #JoinColumnsOrFormulas({ #JoinColumnOrFormula(column =
#JoinColumn(name = "template", referencedColumnName = "id")),
#JoinColumnOrFormula(formula = #JoinFormula(value = "'custom'",
referencedColumnName = "type")) }) This is caused by identifying the
column names within the logicalToPhysical map of
TableColumnNameBinding. Within this map the column names are
surrounded by grave accents (`id`) while the check do a lookup to the
map with plain column name (id).
A workaround for this issue is surrounding the column name with gave
accents.
#ManyToOne #JoinColumnsOrFormulas({ #JoinColumnOrFormula(column =
#JoinColumn(name = "template", referencedColumnName = "`id`")),
#JoinColumnOrFormula(formula = #JoinFormula(value = "'custom'",
referencedColumnName = "`type`")) })
I have two tables:
users:
user_id (primary)
ip (unique)
etc ..
services_to_ip
id (primary)
service_id
ip
etc ..
In class User:
#OneToMany()
#JoinColumn(name = "ip", insertable = false, nullable = false, updatable = false)
public List<QPlanService> getPlanServices() {
return planServices;
}
Using MySQL query log we get something like that:
SELECT *
FROM services_users planservic0_
LEFT OUTER JOIN services qservice1_
ON planservic0_.service_id = qservice1_.id
WHERE planservic0_.ip = 777
In WHERE condition the 'user_id' field used (the default field is primary key - users.id) (user_id=777).
How can I specify that I need to take the value of the 'ip' field from User entity, not 'user_id'?
I will be grateful for any help!
JoinColumn will only specify the name of the column holding the foreign key, so changing the name of joincolumn absolutely will not help.
Hibernate will be using the primary key by default for joining, if you want to override this you can simply use referencedColumnName in your relation, but the referenced column should be unique
As Amer Qarabsa mentioned above:
#OneToMany()
#JoinColumn(name = "ip", insertable = false, nullable = false, updatable = false, referencedColumnName="ipcolumnName")
public List<QPlanService> getPlanServices() {
return planServices;
}
When mapping two or more columns in innerjoin there is a map to the conditions and
Can I change or a condition?
Parent table
#OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "user")
private List<KeyboxDept> keyboxDept;
Child table
#ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JoinColumns({
#JoinColumn(name = "KEY_TARGET_ID", referencedColumnName = "DEPT_ID", insertable = false, updatable = false),
#JoinColumn(name = "KEY_TARGET_UPPER_ID", referencedColumnName = "DEPT_ID", insertable = false, updatable = false)
})
private User user;
Query is made
select
user0_.user_id as user_id1_3_,
user0_.dept_id as dept_id2_3_,
user0_.posi_id as posi_id3_3_
from
cm_user user0_
inner join
cm_keybox_dept keyboxdept2_
on user0_.dept_id=keyboxdept2_.key_target_id
and user0_.dept_id=keyboxdept2_.key_target_upper_id
where
user0_.user_id=? limit ?
Can i switch and -> or ???
I am not sure about JPA but In Hibernate Using Criteria we can do this....
Criteria criteria = session.createCriteria(persistentClass);
criteria.createCriteria("propertyName", Criteria.LEFT_JOIN);
You have cascade = CascadeType.ALL in entity definition. That means, The operations that must be cascaded to the target of the association. So the target (KeyboxDept in your code) must exist. If you remove it, means no operations being cascaded, I think the generated sql will have no inner.
If your search criteria is not a foreign key matching to the joined table key then you cannot use this syntax because there is obviously an AND relationship between the separate column parts (#JoinColumn elements) of the foreign key. This is why the generated native SQL contains the AND. If you need the OR, you need to initialize that member with a separate JPQL query which contains the OR and you do not need the annotation #ManyToOne.
The 3 tables are "analyticalgroups", "labinstructions", "observedproperties". Each table has an "id" primary key column.
I'd like to use a 4th table ("analyticalgroups_observedproperties_labinstructions") to store the OneToMany relationship. Ultimately I'd like the output to be structured something like this:
analyticalGroup: {
id: "...",
observedPropertyLabInstructions: [
{observedProperty, labInstruction},
{observedProperty, labInstruction},
{observedProperty, labInstruction},
...etc...
]
}
I've followed some examples online, but can't get this to work. The problem is when I try this I get the following error:
"message" : "Error occurred at repository: PSQLException: ERROR: column observedpr0_.observedpropertyentitylabinstructionentitymap_id does not exist\n Position: 6550",
"errorCode" : "gaia.domain.exceptions.RepositoryException",
Here's the structure for the join table.
CREATE TABLE analyticalgroups_observedproperties_labinstructions
(
analyticalgroupid character varying(36) NOT NULL,
labinstructionid character varying(36) NOT NULL,
observedpropertyid character varying(36) NOT NULL,
CONSTRAINT fk_analyticalgroups_observedproperties_labinstructions_groupid FOREIGN KEY (analyticalgroupid)
REFERENCES analyticalgroups (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE CASCADE,
CONSTRAINT fk_analyticalgroups_observedproperties_labinstructions_labinstr FOREIGN KEY (labinstructionid)
REFERENCES labinstructions (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE CASCADE,
CONSTRAINT fk_analyticalgroups_observedproperties_labinstructions_observed FOREIGN KEY (observedpropertyid)
REFERENCES observedproperties (id) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE CASCADE
)
#Entity
#Data
public class AnalyticalGroupEntity {
public static final String ENTITY_NAME = "analyticalGroups";
public static final String JOIN_OBSERVEDPROPERTIES_LABINSTRUCTIONS_TABLE_NAME =
ENTITY_NAME +
IDomainEntity.UNDERSCORE +
ObservedPropertyEntity.ENTITY_NAME +
IDomainEntity.UNDERSCORE +
LabInstructionEntity.ENTITY_NAME;
#Id
#Column(name = IDomainEntity.ID_KEY, nullable = false, columnDefinition = IDomainEntity.COLUMN_TYPE_UUID)
private String id;
#OneToMany
#JoinTable(
name = JOIN_OBSERVEDPROPERTIES_LABINSTRUCTIONS_TABLE_NAME,
joinColumns = #JoinColumn(name = LabInstructionEntity.ID_KEY, referencedColumnName = IDomainEntity.ID_KEY, table = "labinstructions")
)
#MapKeyJoinColumn(name = ObservedPropertyEntity.ID_KEY, referencedColumnName = IDomainEntity.ID_KEY, table = "observedproperties")
private Map<ObservedPropertyEntity, LabInstructionEntity> observedPropertyLabInstructions;
}
Hopefully I've laid this all out as clearly as necessary.
Your help is much appreciated. Thanks for reading!
edit Actually... it turns out this doesn't work. It successfully gets the data I want, buuuuut it also deletes every row in the join table whenever I make a GET request *flip table*
So bizarre!
#OneToMany
#JoinTable(
name = JOIN_OBSERVEDPROPERTIES_LABINSTRUCTIONS_TABLE_NAME,
joinColumns = #JoinColumn(name = "analyticalgroupid", referencedColumnName = IDomainEntity.ID_KEY, table = "labinstructions"),
inverseJoinColumns = #JoinColumn(name = LabInstructionEntity.ID_KEY, referencedColumnName = IDomainEntity.ID_KEY, table = "labinstructions")
)
#MapKeyJoinColumn(name = ObservedPropertyEntity.ID_KEY, referencedColumnName = IDomainEntity.ID_KEY, table = "observedproperties")
private Map<ObservedPropertyEntity, LabInstructionEntity> observedPropertyEntityLabInstructionEntityMap;