mssqldelegate.java

定时器开源项目, 相对于 jcrontab, Quartz 算是更完整的一个项目, 随著开发的版本上来, 他已经脱离只是写在程序里面的计时器, 在指定的时间或区间, 处理所指定的事件. 也加入了 se

/*
 * Copyright James House (c) 2001-2004
 * 
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 1.
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer. 2. Redistributions in
 * binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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.quartz.impl.jdbcjobstore;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.commons.logging.Log;

/**
 * <p>
 * This is a driver delegate for the MSSQL JDBC driver.
 * </p>
 * 
 * @author <a href="mailto:[e-mail]">Jeffrey Wescott</a>
 */
public class MSSQLDelegate extends StdJDBCDelegate {
    /**
     * <p>
     * Create new MSSQLDelegate instance.
     * </p>
     * 
     * @param logger
     *          the logger to use during execution
     * @param tablePrefix
     *          the prefix of all table names
     */
    public MSSQLDelegate(Log log, String tablePrefix, String instanceId) {
        super(log, tablePrefix, instanceId);
    }

    public MSSQLDelegate(Log log, String tablePrefix, String instanceId, Boolean useProperties) {
        super(log, tablePrefix, instanceId, useProperties);
    }

    //---------------------------------------------------------------------------
    // protected methods that can be overridden by subclasses
    //---------------------------------------------------------------------------

    /**
     * <p>
     * This method should be overridden by any delegate subclasses that need
     * special handling for BLOBs. The default implementation uses standard
     * JDBC <code>java.sql.Blob</code> operations.
     * </p>
     * 
     * @param rs
     *          the result set, already queued to the correct row
     * @param colName
     *          the column name for the BLOB
     * @return the deserialized Object from the ResultSet BLOB
     * @throws ClassNotFoundException
     *           if a class found during deserialization cannot be found
     * @throws IOException
     *           if deserialization causes an error
     */
    protected Object getObjectFromBlob(ResultSet rs, String colName)
            throws ClassNotFoundException, IOException, SQLException {
        InputStream binaryInput = rs.getBinaryStream(colName);

        ObjectInputStream in = new ObjectInputStream(binaryInput);
        Object obj = in.readObject();
        in.close();

        return obj;
    }

    protected Object getJobDetailFromBlob(ResultSet rs, String colName)
            throws ClassNotFoundException, IOException, SQLException {
        if (canUseProperties()) {
            InputStream binaryInput = rs.getBinaryStream(colName);
            return binaryInput;
        }
        return getObjectFromBlob(rs, colName);
    }
}

// EOF