Getting SQL script from Hibernate update

I'm looking for way to get the SQL update scri开发者_Python百科pt when Hibernate automatically updates tables.

I'm using hibernate.hbm2ddl.auto=update in development environment only, and I need SQL script that updates tables for production.

I want these SQL scripts in txt format for revision and potential edit.

How can this be done? Thanks for any advice.

There are some suggestions and general discussion here.

In a nutshell, you can turn on logging (to standard output):

hibernate.show_sql=true

Alternatively, if you use log4j, you can add this to your log4j.properties file:

log4j.logger.org.hibernate.SQL=DEBUG

Both of these approaches are going to output Hibernate's prepared statements with parameters (so the parameter values themselves are not inline). To get around this, you could use an interceptor like P6Spy. Details on that can be found here.

org.hibernate.cfg.Configuration class has method:

public java.lang.String[] generateSchemaUpdateScript( Dialect, DatabaseMetadata)

what generates the reqiured update script.

I've just implemented this in grails:

configuration = new DefaultGrailsDomainConfiguration(
                    grailsApplication: grailsApplication,
                    properties: props) 
//this extends hibernate config

Connection c = SessionFactoryUtils.getDataSource(sessionFactory).getConnection(props.'hibernate.connection.username', props.'hibernate.connection.password')
<br/>md = new DatabaseMetadata(c, DialectFactory.buildDialect(props.'hibernate.dialect'))

configuration.generateSchemaUpdateScript(DialectFactory.buildDialect(props.'hibernate.dialect'), md)
)
check SchemaExport script in grails, for further information, it uses hibernate to generate schema.

(I had to implent is as a service because we have external domain model)