JPA: Delete child from parent without merge on parent in bi-directional relationship
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I am working with the following parent-child-relationship:
@Entity
@Audited
public class Parent implements Serializable {
@Id
private Long id;
@OneToMany(mappedBy = "parent", cascade = {CascadeType.ALL}, orphanRemoval = true)
private Set<Child> children;
// Empty default constructor
// Getters and setters
}
@Entity
@Audited
public class Child implements Serializable {
@Id
private Long id;
@ManyToOne
@JoinColumn(nullable = false)
private Parent parent;
// Empty default constructor
// Getters and setters
}
The use-case I am working on foresees that I am removing a child from its parent, but at this point in time, I am explicitly not supposed to merge the parent entity. Hence, I tried as follows:
Child childFromDb = entityManager.find(Child.class, child.getId());
childFromDb.setParent(null);
entityManager.remove();
This results in an java.sql.BatchUpdateException: (conn:1) Column 'parent_id' cannot be null thrown by Hibernate.
Setting @JoinColumn(nullable = true) resolves this issue but the database schema uses DEFAULT NULL on the column which is not desired as no child objects may exist without a related parent. As a plus, I cannot use a delete statement in HQL, JPQL, native SQL or a CriteriaDelete as the tables are audited using Envers (5.1.4). I remember that Envers does not support bulk statements (insert, update, delete, https://hibernate.atlassian.net/browse/HHH-3554) or CriteraUpdate/CriteraDelete (https://hibernate.atlassian.net/browse/HHH-10318).
How can I remove just the child without merging the parent, keeping the NOT NULL column constraint and not using a different deletion option? Is this even possible?
hibernate hibernate-envers jpa-2.1
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
add a comment |
I am working with the following parent-child-relationship:
@Entity
@Audited
public class Parent implements Serializable {
@Id
private Long id;
@OneToMany(mappedBy = "parent", cascade = {CascadeType.ALL}, orphanRemoval = true)
private Set<Child> children;
// Empty default constructor
// Getters and setters
}
@Entity
@Audited
public class Child implements Serializable {
@Id
private Long id;
@ManyToOne
@JoinColumn(nullable = false)
private Parent parent;
// Empty default constructor
// Getters and setters
}
The use-case I am working on foresees that I am removing a child from its parent, but at this point in time, I am explicitly not supposed to merge the parent entity. Hence, I tried as follows:
Child childFromDb = entityManager.find(Child.class, child.getId());
childFromDb.setParent(null);
entityManager.remove();
This results in an java.sql.BatchUpdateException: (conn:1) Column 'parent_id' cannot be null thrown by Hibernate.
Setting @JoinColumn(nullable = true) resolves this issue but the database schema uses DEFAULT NULL on the column which is not desired as no child objects may exist without a related parent. As a plus, I cannot use a delete statement in HQL, JPQL, native SQL or a CriteriaDelete as the tables are audited using Envers (5.1.4). I remember that Envers does not support bulk statements (insert, update, delete, https://hibernate.atlassian.net/browse/HHH-3554) or CriteraUpdate/CriteraDelete (https://hibernate.atlassian.net/browse/HHH-10318).
How can I remove just the child without merging the parent, keeping the NOT NULL column constraint and not using a different deletion option? Is this even possible?
hibernate hibernate-envers jpa-2.1
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
There must be something else going on in your code as the snippet you proposed on setting the parent-property tonullon theChildand then calling theremovemethod to remove theChildinstance works for 5.4. Can you describe the transaction boundaries and what other objects are potentially loaded in the persistence-context when you're trying to perform this operation?
– Naros
Nov 20 '18 at 15:09
add a comment |
I am working with the following parent-child-relationship:
@Entity
@Audited
public class Parent implements Serializable {
@Id
private Long id;
@OneToMany(mappedBy = "parent", cascade = {CascadeType.ALL}, orphanRemoval = true)
private Set<Child> children;
// Empty default constructor
// Getters and setters
}
@Entity
@Audited
public class Child implements Serializable {
@Id
private Long id;
@ManyToOne
@JoinColumn(nullable = false)
private Parent parent;
// Empty default constructor
// Getters and setters
}
The use-case I am working on foresees that I am removing a child from its parent, but at this point in time, I am explicitly not supposed to merge the parent entity. Hence, I tried as follows:
Child childFromDb = entityManager.find(Child.class, child.getId());
childFromDb.setParent(null);
entityManager.remove();
This results in an java.sql.BatchUpdateException: (conn:1) Column 'parent_id' cannot be null thrown by Hibernate.
Setting @JoinColumn(nullable = true) resolves this issue but the database schema uses DEFAULT NULL on the column which is not desired as no child objects may exist without a related parent. As a plus, I cannot use a delete statement in HQL, JPQL, native SQL or a CriteriaDelete as the tables are audited using Envers (5.1.4). I remember that Envers does not support bulk statements (insert, update, delete, https://hibernate.atlassian.net/browse/HHH-3554) or CriteraUpdate/CriteraDelete (https://hibernate.atlassian.net/browse/HHH-10318).
How can I remove just the child without merging the parent, keeping the NOT NULL column constraint and not using a different deletion option? Is this even possible?
hibernate hibernate-envers jpa-2.1
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
I am working with the following parent-child-relationship:
@Entity
@Audited
public class Parent implements Serializable {
@Id
private Long id;
@OneToMany(mappedBy = "parent", cascade = {CascadeType.ALL}, orphanRemoval = true)
private Set<Child> children;
// Empty default constructor
// Getters and setters
}
@Entity
@Audited
public class Child implements Serializable {
@Id
private Long id;
@ManyToOne
@JoinColumn(nullable = false)
private Parent parent;
// Empty default constructor
// Getters and setters
}
The use-case I am working on foresees that I am removing a child from its parent, but at this point in time, I am explicitly not supposed to merge the parent entity. Hence, I tried as follows:
Child childFromDb = entityManager.find(Child.class, child.getId());
childFromDb.setParent(null);
entityManager.remove();
This results in an java.sql.BatchUpdateException: (conn:1) Column 'parent_id' cannot be null thrown by Hibernate.
Setting @JoinColumn(nullable = true) resolves this issue but the database schema uses DEFAULT NULL on the column which is not desired as no child objects may exist without a related parent. As a plus, I cannot use a delete statement in HQL, JPQL, native SQL or a CriteriaDelete as the tables are audited using Envers (5.1.4). I remember that Envers does not support bulk statements (insert, update, delete, https://hibernate.atlassian.net/browse/HHH-3554) or CriteraUpdate/CriteraDelete (https://hibernate.atlassian.net/browse/HHH-10318).
How can I remove just the child without merging the parent, keeping the NOT NULL column constraint and not using a different deletion option? Is this even possible?
hibernate hibernate-envers jpa-2.1
hibernate hibernate-envers jpa-2.1
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
asked Nov 16 '18 at 11:42
fatdevelopsfatdevelops
1581415
1581415
There must be something else going on in your code as the snippet you proposed on setting the parent-property tonullon theChildand then calling theremovemethod to remove theChildinstance works for 5.4. Can you describe the transaction boundaries and what other objects are potentially loaded in the persistence-context when you're trying to perform this operation?
– Naros
Nov 20 '18 at 15:09
add a comment |
There must be something else going on in your code as the snippet you proposed on setting the parent-property tonullon theChildand then calling theremovemethod to remove theChildinstance works for 5.4. Can you describe the transaction boundaries and what other objects are potentially loaded in the persistence-context when you're trying to perform this operation?
– Naros
Nov 20 '18 at 15:09
There must be something else going on in your code as the snippet you proposed on setting the parent-property to
null on the Child and then calling the remove method to remove the Child instance works for 5.4. Can you describe the transaction boundaries and what other objects are potentially loaded in the persistence-context when you're trying to perform this operation?– Naros
Nov 20 '18 at 15:09
There must be something else going on in your code as the snippet you proposed on setting the parent-property to
null on the Child and then calling the remove method to remove the Child instance works for 5.4. Can you describe the transaction boundaries and what other objects are potentially loaded in the persistence-context when you're trying to perform this operation?– Naros
Nov 20 '18 at 15:09
add a comment |
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There must be something else going on in your code as the snippet you proposed on setting the parent-property to
nullon theChildand then calling theremovemethod to remove theChildinstance works for 5.4. Can you describe the transaction boundaries and what other objects are potentially loaded in the persistence-context when you're trying to perform this operation?– Naros
Nov 20 '18 at 15:09