delete row in join table with jpa
I have a problem and I can not find the solution. I have a Book table and an Author table, with many to many relationship. The Book table is in the book schema, and the Author table in the person schema. So I have this:
book.book
people.author
I made the following code:
*** Entity Book ***
@ManyToMany(mappedBy = "book")
private List<Author> author = new ArrayList<>();
and
*** Entity Author ***
@ManyToMany
@JoinTable(schema = "join_tables", name = "book_author", joinColumns = @JoinColumn(name = "fk_author"), inverseJoinColumns = @JoinColumn(name = "fk_book"))
private List<Book> books = new ArrayList<>();
I can register a book with several authors, one author with several books. I can insert an author to a book already registered. Insert a book to an author already registered. But I can not remove the relationship of a book to an author.
What I tried to do:
@Repository
public interface AuthorRepository extends JpaRepository<Author, Long> {
@Query("DELETE FROM join_tables.book_author jtba WHERE jtba.fk_author = :fka AND jtba.fk_book = :fkb")
void deleteRelationshipBookAuthor(@Param("fka") Long fka, @Param("fkb") Long fkb);
}
And it always shows the same error:
org.hibernate.hql.internal.ast.QuerySyntaxException: join_tables.book_author is not mapped
But the table exists in the database and has all the data I entered.
postgresql spring-boot jpa
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
add a comment |
I have a problem and I can not find the solution. I have a Book table and an Author table, with many to many relationship. The Book table is in the book schema, and the Author table in the person schema. So I have this:
book.book
people.author
I made the following code:
*** Entity Book ***
@ManyToMany(mappedBy = "book")
private List<Author> author = new ArrayList<>();
and
*** Entity Author ***
@ManyToMany
@JoinTable(schema = "join_tables", name = "book_author", joinColumns = @JoinColumn(name = "fk_author"), inverseJoinColumns = @JoinColumn(name = "fk_book"))
private List<Book> books = new ArrayList<>();
I can register a book with several authors, one author with several books. I can insert an author to a book already registered. Insert a book to an author already registered. But I can not remove the relationship of a book to an author.
What I tried to do:
@Repository
public interface AuthorRepository extends JpaRepository<Author, Long> {
@Query("DELETE FROM join_tables.book_author jtba WHERE jtba.fk_author = :fka AND jtba.fk_book = :fkb")
void deleteRelationshipBookAuthor(@Param("fka") Long fka, @Param("fkb") Long fkb);
}
And it always shows the same error:
org.hibernate.hql.internal.ast.QuerySyntaxException: join_tables.book_author is not mapped
But the table exists in the database and has all the data I entered.
postgresql spring-boot jpa
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
add a comment |
I have a problem and I can not find the solution. I have a Book table and an Author table, with many to many relationship. The Book table is in the book schema, and the Author table in the person schema. So I have this:
book.book
people.author
I made the following code:
*** Entity Book ***
@ManyToMany(mappedBy = "book")
private List<Author> author = new ArrayList<>();
and
*** Entity Author ***
@ManyToMany
@JoinTable(schema = "join_tables", name = "book_author", joinColumns = @JoinColumn(name = "fk_author"), inverseJoinColumns = @JoinColumn(name = "fk_book"))
private List<Book> books = new ArrayList<>();
I can register a book with several authors, one author with several books. I can insert an author to a book already registered. Insert a book to an author already registered. But I can not remove the relationship of a book to an author.
What I tried to do:
@Repository
public interface AuthorRepository extends JpaRepository<Author, Long> {
@Query("DELETE FROM join_tables.book_author jtba WHERE jtba.fk_author = :fka AND jtba.fk_book = :fkb")
void deleteRelationshipBookAuthor(@Param("fka") Long fka, @Param("fkb") Long fkb);
}
And it always shows the same error:
org.hibernate.hql.internal.ast.QuerySyntaxException: join_tables.book_author is not mapped
But the table exists in the database and has all the data I entered.
postgresql spring-boot jpa
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
I have a problem and I can not find the solution. I have a Book table and an Author table, with many to many relationship. The Book table is in the book schema, and the Author table in the person schema. So I have this:
book.book
people.author
I made the following code:
*** Entity Book ***
@ManyToMany(mappedBy = "book")
private List<Author> author = new ArrayList<>();
and
*** Entity Author ***
@ManyToMany
@JoinTable(schema = "join_tables", name = "book_author", joinColumns = @JoinColumn(name = "fk_author"), inverseJoinColumns = @JoinColumn(name = "fk_book"))
private List<Book> books = new ArrayList<>();
I can register a book with several authors, one author with several books. I can insert an author to a book already registered. Insert a book to an author already registered. But I can not remove the relationship of a book to an author.
What I tried to do:
@Repository
public interface AuthorRepository extends JpaRepository<Author, Long> {
@Query("DELETE FROM join_tables.book_author jtba WHERE jtba.fk_author = :fka AND jtba.fk_book = :fkb")
void deleteRelationshipBookAuthor(@Param("fka") Long fka, @Param("fkb") Long fkb);
}
And it always shows the same error:
org.hibernate.hql.internal.ast.QuerySyntaxException: join_tables.book_author is not mapped
But the table exists in the database and has all the data I entered.
postgresql spring-boot jpa
postgresql spring-boot jpa
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
asked Nov 14 '18 at 18:22
Rodrigo BatistaRodrigo Batista
567
567
add a comment |
add a comment |
1 Answer
1
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oldest
votes
A join table is not an entity so you cannot use it in JPQL query(DELETE FROM join_tables.book_author is wrong)
in your relationship, Auther is owning side. so you can remove the book from the books collection and then save the author
author.books.remove(book)
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
A join table is not an entity so you cannot use it in JPQL query(DELETE FROM join_tables.book_author is wrong)
in your relationship, Auther is owning side. so you can remove the book from the books collection and then save the author
author.books.remove(book)
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
add a comment |
A join table is not an entity so you cannot use it in JPQL query(DELETE FROM join_tables.book_author is wrong)
in your relationship, Auther is owning side. so you can remove the book from the books collection and then save the author
author.books.remove(book)
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
add a comment |
A join table is not an entity so you cannot use it in JPQL query(DELETE FROM join_tables.book_author is wrong)
in your relationship, Auther is owning side. so you can remove the book from the books collection and then save the author
author.books.remove(book)
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
A join table is not an entity so you cannot use it in JPQL query(DELETE FROM join_tables.book_author is wrong)
in your relationship, Auther is owning side. so you can remove the book from the books collection and then save the author
author.books.remove(book)
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
answered Nov 14 '18 at 20:08
Mehran MastcheshmiMehran Mastcheshmi
4081310
4081310
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
add a comment |
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
1
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
add a comment |
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