java - 为什么我的 JDBC 准备语句更新没有更新数据库？

Question

我正在使用 JDBC 更新我的 MySQL 数据库中的一行:

    pConnection.setAutoCommit(true); 

    PreparedStatement pstmt = pConnection.prepareStatement("update mg_build_queue " + //
            "set buildsetid=?,locale=?,areacode=?,distversionid=?,platformid=?,version=?," + //
            "priority=?,buildstatus=?,computername=?,buildoutput=?,started=?,finished=?, packageid=?, lockcounter=0 where buildid=?" //
    );

    pstmt.setInt(1, mBuildSet.getId());
    pstmt.setString(2, Locale.localesToString(mLocales, ","));
    pstmt.setString(3, mAreaCode.toString());
    pstmt.setInt(4, mDistVersionId);
    pstmt.setInt(5, mPlatform);
    pstmt.setInt(6, mVersion);
    pstmt.setLong(7, mPriority);
    pstmt.setInt(8, mBuildStatus);
    pstmt.setString(9, mComputerName);
    pstmt.setString(10, mBuildOutput);
    pstmt.setTimestamp(11, timeToTimestamp(mStarted));
    pstmt.setTimestamp(12, timeToTimestamp(mFinished));
    pstmt.setInt(13, mResultPackageId);
    pstmt.setInt(14, mBuildId);

    LOGGER.debug("Updating data for mg_build_queue: " + pstmt);
    pstmt.execute();
    LOGGER.debug("Updated " + pstmt.getUpdateCount() + " rows."); 

这将生成以下输出:

2012-05-24 09:54:33,211 [Thread-1] DEBUG com.buildmaster.BuildQueueEntryImpl - Updating data for mg_build_queue: com.mysql.jdbc.JDBC4PreparedStatement@35e09eab: update mg_build_queue set buildsetid=201,locale='FR',areacode='XX',distversionid=95,platformid=4604,version=65807,priority=33652480,buildstatus=1,computername='MY_COMPUTER-C:\\BUILDS',buildoutput='',started='2012-05-24 09:54:33',finished='2012-05-24 19:45:27', packageid=0, lockcounter=0 where buildid=122418
2012-05-24 09:54:33,214 [Thread-1] DEBUG com.buildmaster.BuildQueueEntryImpl - Updated 1 rows.

我看也不异常(exception)。如果我查询 DBVisualizer 中的条目，我只会看到旧值。如果我在 DBVisualizer 中手动运行命令(从上面复制和粘贴)，我可以看到更新后的值。

为什么会这样？

Answer 1

调用 pConnection.commit() 是必须反射(reflect)数据库中的变化，如果你显式设置

pConnection.setAutoCommit(false)