IBatis 自动生成主键

<!-- Oracle SEQUENCE Example using .NET 1.1 System.Data.OracleClient -->
<insert id="insertProduct-ORACLE" parameterClass="product">
    <selectKey resultClass="int" type="pre" keyProperty="id" >
        SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL
    </selectKey>
    insert into PRODUCT (PRD_ID,PRD_DESCRIPTION) values (#id#,#description#)
</insert>

<!-- Microsoft SQL Server IDENTITY Column Example -->
<insert id="insertProduct-MS-SQL" parameterClass="product">
    insert into PRODUCT (PRD_DESCRIPTION)
    values (#description#)
    <selectKey resultClass="int" type="post" keyProperty="id" >
        select @@IDENTITY as value
    </selectKey>
</insert>

<!-- MySQL Example -->
<insert id="insertProduct-MYSQL" parameterClass="product">
    insert into PRODUCT (PRD_DESCRIPTION)
    values (#description#)
    <selectKey resultClass="int" type="post" keyProperty="id" >
        select LAST_INSERT_ID() as value
    </selectKey>
</insert>