org.firebirdsql.jdbc.FBDatabaseMetaData Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of jaybird-jdk16 Show documentation
JDBC Driver for the Firebird RDBMS
There is a newer version: 2.2.15
/*
 * Firebird Open Source JavaEE Connector - JDBC Driver
 *
 * Distributable under LGPL license.
 * You may obtain a copy of the License at http://www.gnu.org/copyleft/lgpl.html
 *
 * 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
 * LGPL License for more details.
 *
 * This file was created by members of the firebird development team.
 * All individual contributions remain the Copyright (C) of those
 * individuals.  Contributors to this file are either listed here or
 * can be obtained from a source control history command.
 *
 * All rights reserved.
 */
package org.firebirdsql.jdbc;

import java.security.AccessController;
import java.security.PrivilegedAction;
import java.sql.RowIdLifetime;
import java.sql.SQLException;

import org.firebirdsql.gds.GDSException;

public class FBDatabaseMetaData extends AbstractDatabaseMetaData {

    public FBDatabaseMetaData(AbstractConnection c) throws GDSException {
        super(c);
    }

    /**
     * Indicates whether or not this data source supports the SQL ROWID type,
     * and if so  the lifetime for which a RowId object remains valid. 
     * 
     * The returned int values have the following relationship: 
     * 
     *     ROWID_UNSUPPORTED < ROWID_VALID_OTHER < ROWID_VALID_TRANSACTION
     *         < ROWID_VALID_SESSION < ROWID_VALID_FOREVER
     * 
     * so conditional logic such as 
     *      *     if (metadata.getRowIdLifetime() > DatabaseMetaData.ROWID_VALID_TRANSACTION)
     * 
     * can be used. Valid Forever means valid across all Sessions, and valid for 
     * a Session means valid across all its contained Transactions. 
     *
     * @return the status indicating the lifetime of a RowId
     * @throws SQLException if a database access error occurs
     * @since 1.6
     */
    public RowIdLifetime getRowIdLifetime() throws SQLException {
        return RowIdLifetime.ROWID_UNSUPPORTED;
    }

    public int getJDBCMajorVersion() {
        return 4;
    }
    
    public int getJDBCMinorVersion() {
        try {
            String javaImplementation = AccessController.doPrivileged(new PrivilegedAction() {
                public String run() {
                    return System.getProperty("java.specification.version");
                } 
             });
            if (javaImplementation != null && "1.7".compareTo(javaImplementation) <= 0) {
                // JDK 1.7 or higher: JDBC 4.1
                return 1;
            } else {
                // JDK 1.6 (or lower): JDBC 4.0
                return 0;
            }
        } catch (RuntimeException ex) {
            // default to 0 (JDBC 4.0) when privileged call fails
            return 0;
        }
    }
}