executeBatch方法详解2

 * If one of the commands in a batch update fails to execute properly,
     * this method throws a <code>BatchUpdateException</code>, and a JDBC
     * driver may or may not continue to process the remaining commands in
     * the batch. 
       如果批量处理时其中一个命令执行失败，则会抛出一个异常BatchUpdateException
       JDBC驱动可能会停止剩余的命令，也可能继续执行剩余的命令。
     * However, the driver's behavior must be consistent with a
     * particular DBMS, either always continuing to process commands or never
     * continuing to process commands. 
       不管怎样，驱动要怎么做取决于数据库管理系统的细节，总是执行或总是不执行两者其一。
     * If the driver continues processing
     * after a failure, the array returned by the method
     * <code>BatchUpdateException.getUpdateCounts</code>
     * will contain as many elements as there are commands in the batch, and
     * at least one of the elements will be the following:
       发生失败后如果驱动继续执行，通过BatchUpdateException.getUpdateCounts()方法返回
       的数组应该包括批处理中有的那些命令的结果，并且至少有一个元素的值是下面的情况：
     * <P>
     * <LI>A value of <code>EXECUTE_FAILED</code> -- indicates that the command failed
     * to execute successfully and occurs only if a driver continues to
     * process commands after a command fails
           int EXECUTE_FAILED = -3;
           指示命令没有成功执行的常量值EXECUTE_FAILED，并且只有在命令出错后驱动继续执行的情况下才会出现，
           如果出错后不再执行，则返回的结果中没有错误信息只有那些被成功执行后的结果。
     * </OL>
     * <P>