42 lines
3.4 KiB
Plaintext
42 lines
3.4 KiB
Plaintext
Hibernate: create global temporary table HTE_book(rn_ integer not null, id bigint, version bigint, author varchar(255), title varchar(255), primary key (rn_)) transactional
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Hibernate: create global temporary table HTE_widget_sequence(rn_ integer not null, id bigint, name varchar(255), primary key (rn_)) transactional
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Hibernate: create table book (id bigint not null, author varchar(255), title varchar(255), version bigint not null, primary key (id))
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Hibernate: create table widget_identity (id bigint generated by default as identity, name varchar(255), primary key (id))
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Hibernate: create table widget_sequence (id bigint not null, name varchar(255), primary key (id))
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Hibernate: create sequence book_seq start with 1 increment by 50
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Hibernate: create sequence widget_seq start with 1 increment by 25
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Hibernate: select next value for book_seq
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.Book */insert into book (author,title,version,id) values (?,?,?,?)
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binding parameter (1:VARCHAR) <- [Robert C. Martin]
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binding parameter (2:VARCHAR) <- [Clean Code]
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binding parameter (3:BIGINT) <- [0]
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binding parameter (4:BIGINT) <- [1]
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SEED: inserted Book{id=1, title=Clean Code, author=Robert C. Martin, version=0}
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--- Step 1: load the row, then close the session (entity is now detached) ---
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Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=?
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binding parameter (1:BIGINT) <- [1]
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detached instance in hand: Book{id=1, title=Clean Code, author=Robert C. Martin, version=0}
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--- Step 2: a second, independent session edits the same row and commits ---
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Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=?
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binding parameter (1:BIGINT) <- [1]
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Hibernate: /* update for com.ankurm.hibernatedemo.model.Book */update book set author=?,title=?,version=? where id=? and version=?
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binding parameter (1:VARCHAR) <- [Robert C. Martin]
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binding parameter (2:VARCHAR) <- [Clean Code (2nd Edition)]
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binding parameter (3:BIGINT) <- [1]
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binding parameter (4:BIGINT) <- [1]
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binding parameter (5:BIGINT) <- [0]
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second session committed: Book{id=1, title=Clean Code (2nd Edition), author=Robert C. Martin, version=1} -- version column has now advanced in the database
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--- Step 3: mutate the ORIGINAL detached instance (still holding the OLD version) and merge() it ---
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detached instance before merge (note the version and title are both stale): Book{id=1, title=Clean Code, author=Robert C. Martin (Uncle Bob), version=0}
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Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=?
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binding parameter (1:BIGINT) <- [1]
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merge() threw jakarta.persistence.OptimisticLockException: Row was already updated or deleted by another transaction for entity [com.ankurm.hibernatedemo.model.Book with id '1']
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the title change from Step 2 survives untouched -- merge() refused to apply a write built on a stale version
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--- Step 4: refresh() on a MANAGED entity with an unflushed local edit ---
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Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=?
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binding parameter (1:BIGINT) <- [1]
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before refresh(): Book{id=1, title=Clean Code (2nd Edition), author=SOMEONE ELSE ENTIRELY (never flushed), version=1}
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Hibernate: select b1_0.id,b1_0.author,b1_0.title,b1_0.version from book b1_0 where b1_0.id=?
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binding parameter (1:BIGINT) <- [1]
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after refresh(): Book{id=1, title=Clean Code (2nd Edition), author=Robert C. Martin, version=1} -- the local edit is gone, no exception was thrown
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