Mybatis Association,mybatisassociation

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Mybatis Association,mybatisassociation

<resultMap id="cpBookCategoryResultMap"
        type="busines.administer.cp.model.CPBookCategory">
        <result column="id" property="id" />
        <result column="name" property="name" />
        <result column="pid" property="pid" />
        <result column="is_parent" property="isParent" />
        <result column="ctime" property="ctime" />
        <result column="utime" property="utime" />
        <association property="childList" column="id" select="getCategoryChildList"/>
    </resultMap>
    
    <resultMap id="cpBookCategoryResultMap_2"
        type="java.util.HashMap">
        <result column="id" property="id"/>
        <result column="name" property="name" />
        <result column="pid" property="pid" />
        <result column="is_parent" property="isParent" javaType="boolean"/>
        <association property="children" column="id" select="getCategoryChildList"/>
    </resultMap>
    
    <select id="getCategoryChildList" resultMap="cpBookCategoryResultMap_2">
        <![CDATA[
            SELECT id, name, is_parent,pid FROM cp.tbl_cp_category where pid=#{value};
        ]]>
    </select>
    
    解釋:1)busines.administer.cp.model.CPBookCategory這個類中有childList這樣一個屬性。
                2)這個屬性childList是一個集合,顯然不會是對應資料庫表中的某一欄位,它來源於另一張表(根據CPBookCategory的id的值作參數)的查詢結果集
                3)將getCategoryChildList查詢的結果集,填充到busines.administer.cp.model.CPBookCategory的childList屬性中,返回

參考:

http://www.cnblogs.com/xdp-gacl/p/4264440.html (寫得最好)

http://blog.csdn.net/isea533/article/details/20868189

http://cczakai.iteye.com/blog/1276722



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