ibatis crud返回值问题

<insert id="insertBook" parameterClass="book">

insert into BOOKS (bookNum, bookName, author, publisher,price,

state, quality) values ( #bookNum:VARCHAR#, #bookName:VARCHAR#,

#author:VARCHAR#,#publisher:VARCHAR#, #price:FLOAT#,

#state:INTEGER#, #quality:INTEGER#)

<selectKey resultClass="int" keyProperty="bookId" >

SELECT @@IDENTITY AS bookId

</selectKey>  

</insert>

在执行insert是才会返回插入的id

    public int update(Book book) throws DatabaseException{

        String method = "update";

        int result = 0;

        try {

            result = update("updateBook", book);

            debug("", method, Constant.LOG_UPDATE_SUCCESS);

        } catch (RuntimeException e) {

            error("", method, Constant.LOG_UPDATE_FAIL);

            throw new DatabaseException(DatabaseException.DB_Message, e);

        }

        return result;

    }

///

对于删除

<delete id="deleteBook" parameterClass="int" >

        DELETE FROM BOOKS WHERE BookId = #bookId#

 </delete>

直接返回影响记录集

    /**

     *

     * @param bookId

     * @throws DatabaseException

     * @return int >0:delete success  <0: delete fail

     */

    public int deleteBook(int bookId) throws DatabaseException{

        String method = "deleteBook";

        int result = -1;

            result = (Integer)this.delete("deleteBook", bookId);

            debug("", method, Constant.LOG_DELETE_SUCCESS);

            result = -1;

            error("", method, Constant.LOG_DELETE_FAIL);