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jdbacl stands for 'Java DataBase ACcess Layer' and provides utilities for accessing JDBC databases from Java programs, retrieving meta information in an object model and querying database data.

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/*
 * (c) Copyright 2008-2012 by Volker Bergmann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, is permitted under the terms of the
 * GNU General Public License.
 *
 * For redistributing this software or a derivative work under a license other
 * than the GPL-compatible Free Software License as defined by the Free
 * Software Foundation or approved by OSI, you must first obtain a commercial
 * license to this software product from Volker Bergmann.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
 * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
 * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package org.databene.jdbacl.dialect;

import java.util.regex.Pattern;

import org.databene.jdbacl.DatabaseDialect;
import org.databene.jdbacl.sql.Query;

/**
 * Implements generic database concepts for DB2


 * Created: 26.01.2008 07:09:34
 * @since 0.4.0
 * @author Volker Bergmann
 */
public class DB2Dialect extends DatabaseDialect {

	private static final String DATE_PATTERN = "''yyyy-MM-dd''";
	private static final String TIME_PATTERN = "''HH:mm:ss''";
	private static final String DATETIME_PATTERN = "''yyyy-MM-dd HH:mm:ss''";

	Pattern randomNamePattern = Pattern.compile("SQL\\d{15}");

    public DB2Dialect() {
	    super("db2", false, true, DATE_PATTERN, TIME_PATTERN, DATETIME_PATTERN);
    }

	@Override
    public boolean isDefaultCatalog(String catalog, String user) {
	    return true;
    }

	@Override
    public boolean isDefaultSchema(String schema, String user) {
	    return true;
    }

	@Override
    public String renderFetchSequenceValue(String sequenceName) {
        String table = "sysibm.sysdummy1";
        String sequence = sequenceName;
        int sep = sequenceName.lastIndexOf('.');
        if (sep > 0) {
            table = sequenceName.substring(0, sep);
            sequence = sequenceName.substring(sep + 1);
        }
        return "select nextval for " + sequence + " from " + table;
    }

	@Override
	public boolean isDeterministicPKName(String pkName) {
		return !randomNamePattern.matcher(pkName).matches();
	}

	@Override
	public boolean isDeterministicUKName(String ukName) {
		return !randomNamePattern.matcher(ukName).matches();
	}

	@Override
	public boolean isDeterministicFKName(String fkName) {
		return !randomNamePattern.matcher(fkName).matches();
	}

	@Override
	public boolean isDeterministicIndexName(String indexName) {
		return !randomNamePattern.matcher(indexName).matches();
	}

	@Override
	public void restrictRownums(int firstRowIndex, int rowCount, Query query) {
	    /* TODO v0.8.2 implement DatabaseDialect.applyRownumRestriction()
			DB2: SELECT * FROM T WHERE ID_T > 20 FETCH FIRST 10 ROWS ONLY
	     */
		throw new UnsupportedOperationException("DB2Dialect.applyRownumRestriction() is not implemented");
	}

}