MyBatis一对一映射

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MyBatis一对一映射

XML配置

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<resultMap id="UserOrderMap" type="User">
    <id property="id" column="id"/>
    <result property="name" column="name"/>
    <association property="order" javaType="Order">
        <id property="id" column="order_id"/>
        <result property="amount" column="amount"/>
    </association>
</resultMap>

注解方式

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@One(@Result(column = "order_id", property = "order", 
    one = @One(select = "com.example.mapper.OrderMapper.findById")))
private Order order;

总结

一对一映射是关联查询的基础。