jdbcsavepoint.java

hsql是很有名的嵌入式数据库

/* Copyright (c) 2001-2005, The HSQL Development Group
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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package org.hsqldb.jdbc;

import java.sql.SQLException;
import java.sql.Savepoint;

import org.hsqldb.Trace;

/**
 * The representation of a savepoint, which is a point within
 * the current transaction that can be referenced from the
 * <code>Connection.rollback</code> method. When a transaction
 * is rolled back to a savepoint all changes made after that
 * savepoint are undone.
 * <p>
 * Savepoints can be either named or unnamed. Unnamed
 * savepoints
 * are identified by an ID generated by the underlying
 * data source.
 *
 *
 * <!-- start Release-specific documentation -->
 * <div class="ReleaseSpecificDocumentation">
 * <h3>HSQLDB-Specific Information:</h3> <p>
 *
 * As SQL draft standards do not provide for unnamed savepoints,
 * this feature is not supported in 1.7.2.<p>
 *
 * Named Savepoints can be set if the Connection is autoCommit. Such Savepoints
 * will be cleared when the next statement is issued unless autoCommit is set
 * to false prior to executing any statement.
 * </div>
 * <!-- end release-specific documentation -->
 *
 *
 * @author boucherb@users
 * @since JDK 1.4, HSQLDB 1.7.2
 */
public class jdbcSavepoint implements Savepoint {

    String         name;
    jdbcConnection connection;

    jdbcSavepoint(String name, jdbcConnection conn) throws SQLException {

        if (name == null) {
            throw Util.sqlException(Trace.INVALID_JDBC_ARGUMENT,
                                    "name is null");
        }

        this.name  = name;
        connection = conn;
    }

    /**
     * Retrieves the generated ID for the savepoint
     * that this <code>Savepoint</code> object represents.
     * @return the numeric ID of this savepoint
     * @exception SQLException if this is a named
     * savepoint
     * @since 1.4
     */
    public int getSavepointId() throws SQLException {
        throw Util.notSupported;
    }

    /**
     * Retrieves the name of the savepoint that this
     * <code>Savepoint</code> object represents. <p>
     *
     * @return the name of this savepoint
     * @exception SQLException if this is an un-named
     * savepoint
     * @since 1.4
     */
    public String getSavepointName() throws SQLException {
        return name;
    }

    public String toString() {
        return super.toString() + "[name=" + name + "]";
    }
}