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High-Availability JDBC
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/*
 * HA-JDBC: High-Availability JDBC
 * Copyright (C) 2012  Paul Ferraro
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 */
package net.sf.hajdbc.dialect.db2;

import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import net.sf.hajdbc.IdentityColumnSupport;
import net.sf.hajdbc.SequenceProperties;
import net.sf.hajdbc.SequencePropertiesFactory;
import net.sf.hajdbc.SequenceSupport;
import net.sf.hajdbc.dialect.StandardDialect;
import net.sf.hajdbc.util.Resources;

/**
 * Dialect for DB2 (commercial).
 * @author  Paul Ferraro
 * @since   1.1
 */
@SuppressWarnings("nls")
public class DB2Dialect extends StandardDialect
{
	/**
	 * {@inheritDoc}
	 * @see net.sf.hajdbc.dialect.StandardDialect#vendorPattern()
	 */
	@Override
	protected String vendorPattern()
	{
		return "db2";
	}

	/**
	 * @see net.sf.hajdbc.dialect.StandardDialect#executeFunctionFormat()
	 */
	@Override
	protected String executeFunctionFormat()
	{
		return "VALUES {0}";
	}

	/**
	 * {@inheritDoc}
	 * @see net.sf.hajdbc.dialect.StandardDialect#getSequenceSupport()
	 */
	@Override
	public SequenceSupport getSequenceSupport()
	{
		return this;
	}

	/**
	 * {@inheritDoc}
	 * @see net.sf.hajdbc.dialect.StandardDialect#getIdentityColumnSupport()
	 */
	@Override
	public IdentityColumnSupport getIdentityColumnSupport()
	{
		return this;
	}

	@Override
	public Collection getSequences(DatabaseMetaData metaData, SequencePropertiesFactory factory) throws SQLException
	{
		Statement statement = metaData.getConnection().createStatement();
		
		try
		{
			ResultSet resultSet = statement.executeQuery("SELECT SEQSCHEMA, SEQNAME, INCREMENT FROM SYSCAT.SEQUENCES");
			
			List sequences = new LinkedList();
			
			while (resultSet.next())
			{
				sequences.add(factory.createSequenceProperties(resultSet.getString(1), resultSet.getString(2), resultSet.getInt(3)));
			}
			
			return sequences;
		}
		finally
		{
			Resources.close(statement);
		}
	}

	/**
	 * @see net.sf.hajdbc.dialect.StandardDialect#sequencePattern()
	 */
	@Override
	protected String sequencePattern()
	{
		return "(?:NEXT|PREV)VAL\\s+FOR\\s+'?([^',\\s\\(\\)]+)";
	}

	/**
	 * @see net.sf.hajdbc.dialect.StandardDialect#nextSequenceValueFormat()
	 */
	@Override
	protected String nextSequenceValueFormat()
	{
		return "NEXTVAL FOR {0}";
	}

	/**
	 * @see net.sf.hajdbc.dialect.StandardDialect#dateLiteralFormat()
	 */
	@Override
	protected String dateLiteralFormat()
	{
		return this.timestampLiteralFormat();
	}

	/**
	 * @see net.sf.hajdbc.dialect.StandardDialect#timeLiteralFormat()
	 */
	@Override
	protected String timeLiteralFormat()
	{
		return this.timestampLiteralFormat();
	}

	/**
	 * @see net.sf.hajdbc.dialect.StandardDialect#timestampLiteralFormat()
	 */
	@Override
	protected String timestampLiteralFormat()
	{
		return "''{0}''";
	}
}