delete row in join table with jpa










0















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.










share|improve this question


























    0















    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.










    share|improve this question
























      0












      0








      0








      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.










      share|improve this question














      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






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 14 '18 at 18:22









      Rodrigo BatistaRodrigo Batista

      567




      567






















          1 Answer
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          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)





          share|improve this answer


















          • 1





            Thank you, Mehran. Works like a charm! Have a great day. =)

            – Rodrigo Batista
            Nov 14 '18 at 23:28











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          2














          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)





          share|improve this answer


















          • 1





            Thank you, Mehran. Works like a charm! Have a great day. =)

            – Rodrigo Batista
            Nov 14 '18 at 23:28
















          2














          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)





          share|improve this answer


















          • 1





            Thank you, Mehran. Works like a charm! Have a great day. =)

            – Rodrigo Batista
            Nov 14 '18 at 23:28














          2












          2








          2







          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)





          share|improve this answer













          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)






          share|improve this answer












          share|improve this answer



          share|improve this answer










          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













          • 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




















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