Hibernate hbm2ddl.auto default value

Question

What is the default value of

hibernate.hbm2ddl.auto

in hibernate cfg file mapping

is it possible to remove

<property name="hibernate.hbm2ddl.auto">update</property>

this mapping from config file

if i remove this property whether it affect my DB

???

raphaëλ · Answer 1 · 2017-04-01T13:42:09.933

50

That is really the answer: no validation, no update, no creation and no dropping takes place when omitting the setting from your configuration. The hibernate source code is the best documentation on Hibernate:

// from org.hibernate.cfg.SettingsFactory line 332 (hibernate-core-3.6.7)      
String autoSchemaExport = properties.getProperty(Environment.HBM2DDL_AUTO);
if ( "validate".equals(autoSchemaExport) ) settings.setAutoValidateSchema(true);
if ( "update".equals(autoSchemaExport) ) settings.setAutoUpdateSchema(true);
if ( "create".equals(autoSchemaExport) ) settings.setAutoCreateSchema(true);
if ( "create-drop".equals(autoSchemaExport) ) {
  settings.setAutoCreateSchema(true);
  settings.setAutoDropSchema(true);
}

edited Apr 01 '17 at 13:42

answered May 17 '12 at 11:38

raphaëλ

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No fair using source code to figure out what's happening inside... ;-) – Dave Feb 14 '13 at 22:49
:) To stop speculation. – Tungata Jan 16 '20 at 12:24

score 28 · Answer 2 · edited May 23 '17 at 11:54

28

Just omitting hibernate.hbm2ddl.auto defaults to Hibernate not doing anything.

Already asked in SO . link

edited May 23 '17 at 11:54

Community

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answered May 17 '12 at 09:51

Abhilash

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Subhrajyoti Majumder · Accepted Answer · 2013-02-15T08:46:15.670

16

Automatically validates or exports schema DDL to the database when the SessionFactory is created. With create-drop, the database schema will be dropped when the SessionFactory is closed explicitly.

validate | update | create | create-drop

validate- existing schema
update- only update your schema once created
create- create schema every time

edited Feb 15 '13 at 08:46

answered May 17 '12 at 10:00

Subhrajyoti Majumder

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I would guess that the downvoter was reacting to the fact that this is verbatim from the hibernate docs. I could see how that might draw a negative reaction, though it doesn't bother me. – chad Jun 25 '13 at 19:29
7

Didn't read and answer question (as rparree did): what happens when you don't specify a value? – Jollymorphic Oct 08 '14 at 23:29
as @Jollymorphic sais, the question is : what happens if you don't specify a value? – user2447161 Oct 23 '17 at 13:20
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`Validate` is the default value for `hibernate.hbm2ddl.auto` – Subhrajyoti Majumder Oct 23 '17 at 14:01
3

@SubhrajyotiMajumder from @raphaëλ's answer it looks like `Validate` is NOT the default - rather nothing happens (not even validation) if you don't specify a value. – Kent Munthe Caspersen May 18 '18 at 06:01

Hibernate hbm2ddl.auto default value

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