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 Post subject: Creating a customized JDBCMetaDataDialect
PostPosted: Thu Dec 08, 2016 12:46 pm 
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Joined: Thu Oct 18, 2012 6:07 pm
Posts: 3
I am working in Eclipse, using HibernateTools 4.0.0.

I am trying to create a custom JDBCMetaDataDialect that extracts CHECK CONSTRAINTS info from a Firebird database.

Two questions:

1) Where do I set hibernatetool.metadatadialect so that I can use my custom class during the reverse engineering process?

2) The code below will help me validate that things are setup properly before I begin making an customizations.

It fails to run because of the following exception:
Quote:
11:38:03 [main] DEBUG org.jboss.logging: Logging Provider: org.jboss.logging.Log4jLoggerProvider
11:38:04 [main] INFO hibernate.cfg.Environment: HHH000205: Loaded properties from resource hibernate.properties: {hibernate.connection.username=SYSDBA, hibernate.connection.password=****, hibernate.connection.charSet=utf8, hibernate.dialect=org.hibernate.dialect.FirebirdDialect, hibernate.connection.url=jdbc:firebirdsql:localhost:C:/MyDB.FDB, hibernate.bytecode.use_reflection_optimizer=false, hibernate.connection.driver_class=org.firebirdsql.jdbc.FBDriver, hibernate.current_session_context_class=org.hibernate.context.internal.ThreadLocalSessionContext}
11:38:04 [main] INFO hibernate.cfg.Environment: HHH000021: Bytecode provider name : javassist
11:38:04 [main] INFO hibernate.cfg.Configuration: HHH000043: Configuring from resource: /hibernate.cfg.xml
11:38:04 [main] INFO hibernate.cfg.Configuration: HHH000040: Configuration resource: /hibernate.cfg.xml
11:38:04 [main] INFO hibernate.cfg.Configuration: HHH000041: Configured SessionFactory: null
Exception in thread "main" java.lang.NullPointerException
at org.hibernate.cfg.reveng.dialect.AbstractMetaDataDialect.getConnection(AbstractMetaDataDialect.java:121)
at org.hibernate.cfg.reveng.dialect.AbstractMetaDataDialect.getMetaData(AbstractMetaDataDialect.java:60)
at org.hibernate.cfg.reveng.dialect.AbstractMetaDataDialect.caseForSearch(AbstractMetaDataDialect.java:163)
at org.hibernate.cfg.reveng.dialect.JDBCMetaDataDialect.getColumns(JDBCMetaDataDialect.java:94)
at com.ttinc.db.FirebirdMetaDataDialect.getColumns(FirebirdMetaDataDialect.java:15)
at com.ttinc.db.FirebirdMetaDataDialect.main(FirebirdMetaDataDialect.java:60)


Here's my code:

Code:
package com.foo.db;

import java.util.Iterator;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Settings;
import org.hibernate.cfg.reveng.dialect.JDBCMetaDataDialect;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class FirebirdMetaDataDialect extends JDBCMetaDataDialect
{
   @Override
   public Iterator getColumns(final String xcatalog, final String xschema, final String xtable, String xcolumn)
   {
      return super.getColumns(xcatalog, xschema, xtable, xcolumn);
   }

   @SuppressWarnings("javadoc")
   public static void main(String[] args)
   {      
      FirebirdMetaDataDialect firebirdMetaDataDialect = new FirebirdMetaDataDialect();

      ServiceRegistryBuilder serviceRegistryBuilder = new ServiceRegistryBuilder();
      Configuration cfg = new Configuration().configure();
      ServiceRegistry serviceRegistry = serviceRegistryBuilder.applySettings(cfg.getProperties()).buildServiceRegistry();
      Settings settings = cfg.buildSettings(serviceRegistry);

      String catalog = settings.getDefaultCatalogName();
      String schema = settings.getDefaultSchemaName();
      String table = "MyTable";
      String column = "MyColumn";

      firebirdMetaDataDialect.getColumns(catalog, schema, table, column);
   }
}


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