Mybatis入门--关联查询一对多

一个customer与多article关联

<resultMap id="customerResultMap" type="Customer">
        <id column="c_id" property="id"/>
        <result column="c_name" property="name"/>
        <result column="c_contact" property="contact"/>
        <result column="c_telephone" property="telephone"/>
        <result column="c_email" property="email"/>
        <!-- property: 指的是集合属性的值, ofType：指的是集合中元素的类型 -->
        <collection property="articles" javaType="ArrayList" ofType="Article">
            <id column="a_id" property="id"/>
            <result column="a_title" property="title"/>
            <result column="a_content" property="content"/>
        </collection>
    </resultMap>

<!-- 根据id查询Customer-->
    <select id="getCustomerById" parameterType="int" resultMap="customerResultMap">
        SELECT
        c.id as c_id,
        c.name as c_name,
        c.contact as c_contact,
        c.telephone as c_telephone,
        c.email as c_email,
        a.id as a_id,
        a.title as a_title,
        a.content as a_content
        FROM customer c
        LEFT OUTER JOIN article a ON c.id = a.customer_id
        WHERE c.id = #{id}
    </select>