PageHelp分页过程中出现的一对多的数据异常问题的处理办法，包括对json数据转化异常的处理

一对多过程中resultMap的写法：

    <resultMap type="com.mall.bean.Orders" id="OrderList" >

        <id column="order_no" property="order_no"></id>
        <result column="user_no" property="user_no"></result>
        <result column="signer_no" property="signer_no"></result>
        <result column="pay_need" property="pay_need"></result>
        <result column="pay_actual" property="pay_actual"></result>
        <result column="postage" property="postage"></result>
        <result column="pay_way" property="pay_way"></result>
        <result column="pay_time" property="pay_time"></result>
        <result column="sign_time" property="sign_time"></result>
        <result column="create_time" property="create_time"></result>
        <result column="state" property="state"></result>

        <collection property="orderItems" column="order_no" javaType="java.util.ArrayList" ofType="com.mall.bean.OrderItem" select="findOrdersItemByNo">
            <result column="product_no" property="product_no"></result>
            <result column="number" property="number"></result>
        </collection>

    </resultMap>

    <select id="findAllOrdersByUserNo" resultMap="OrderList">
        select * from tb_order where user_no = #{user_no}
    </select>

    <select id="findOrdersItemByNo" resultType="com.mall.bean.OrderItem">
        SELECT
        tb_orderitem.product_no,
        tb_orderitem.number
        FROM
        tb_orderitem
        WHERE
        order_no = #{order_no}
    </select>

JSON数据转化异常：
com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found
处理方法：
在实体类中加入注解：

@JsonIgnoreProperties(value = { "hibernateLazyInitializer", "handler" })

标签：PageHelp,orderitem,no,异常,json,user,tb,order
来源： https://blog.csdn.net/qq_37597892/article/details/115395896