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
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
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
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
567
add a comment |
add a comment |
1 Answer
1
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)
1
Thank you, Mehran. Works like a charm! Have a great day. =)
– Rodrigo Batista
Nov 14 '18 at 23:28
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53306546%2fdelete-row-in-join-table-with-jpa%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
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)
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)
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)
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
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 |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53306546%2fdelete-row-in-join-table-with-jpa%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown