Add hibernate-demo: get() vs load(), merge() vs refresh(), inserting objects (Hibernate 7.4.1.Final + Spring Boot 4.1.0)
Adds a JUnit test suite (GetVsGetReferenceTest, MergeRefreshTest, OptimisticLockTest, IdentityBatchTest, SequenceBatchTest, AllocationSizeSweepTest, BatchSizeSweepTest) so every surprising behavior described in the three companion posts has a reproducible test, alongside the original CommandLineRunner scenarios. Rewrites all three doc chapters and the README around the new experiments: the get()/getReference() same-session matrix, the merge()/refresh() experiments (including exactly when OptimisticLockException surfaces and a corrected LAZY-plus- cascade merge() result), and two new sweeps (allocationSize, batch_size) for batch inserts.
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docs/output/insert-identity.txt
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71
docs/output/insert-identity.txt
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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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--- inserting 30 WidgetIdentity rows (GenerationType.IDENTITY) ---
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-1]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-2]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-3]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-4]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-5]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-6]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-7]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-8]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-9]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-10]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-11]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-12]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-13]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-14]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-15]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-16]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-17]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-18]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-19]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-20]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-21]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-22]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-23]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-24]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-25]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-26]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-27]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-28]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-29]
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Hibernate: /* insert for com.ankurm.hibernatedemo.model.WidgetIdentity */insert into widget_identity (name,id) values (?,default)
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binding parameter (1:VARCHAR) <- [identity-30]
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entityInsertCount = 30
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prepareStatementCount = 30
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(with IDENTITY, expect prepareStatementCount to land close to entityInsertCount -- each insert has to go to the database immediately to hand back the generated key, so there is nothing left for hibernate.jdbc.batch_size to batch)
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