java Mybatis resultmap 将值映射到模型的哈希映射字段
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Mybatis resultmap to map values to hash map field of a model
提问by om39a
I am trying to map create a result map that will populate vehicleVO. I want to map few columns to vehicleDocuments HashMap. I am having the data to be populated also present in the same table.
我正在尝试映射创建一个将填充 VehicleVO 的结果映射。我想将几列映射到 VehicleDocuments HashMap。我要填充的数据也存在于同一个表中。
public class VehicleVO implements Serializable {
public String vehicleId;
public String vehicleNumber;
public String model;
public Map<String, Date> vehicleDocuments;
public TransportVO transport;
public String distanceTraveled;
}
I am trying to use the following xml for mapping. But it don't seem to work. I a gettign this error
我正在尝试使用以下 xml 进行映射。但它似乎不起作用。我得到这个错误
"The content of element type "resultMap" must match "(constructor?,id*,result*,association*,collection*,discriminator?)".
“元素类型“resultMap”的内容必须匹配“(constructor?,id*,result*,association*,collection*,discriminator?)”。
<resultMap id="BaseResultMap" type="com.svms.service.vo.VehicleVO">
<id column="vehicle_id" jdbcType="BIGINT" property="vehicleId" />
<result column="vehicle_no" jdbcType="VARCHAR" property="vehicleNumber" />
<result column="Model" jdbcType="VARCHAR" property="model" />
<association property="vehicleDocuments" javaType="java.util.HashMap">
<result column="FC" jdbcType="DATE" property="FC_TD" />
<result column="TAX" jdbcType="DATE" property="TAX_TD" />
<result column="Insureance" jdbcType="DATE" property="INSURANCE_TD" />
<result column="Form47" jdbcType="DATE" property="FORM47_TD" />
<result column="NC" jdbcType="DATE" property="NC_TD" />
</association>
<result column="total_distance" jdbcType="INTEGER" property="distanceTraveled" />
<result column="transport_id" jdbcType="BIGINT" property="transportId" />
</resultMap>
If my understanding is correct, Trying to map to an hashMap can also be considered as association mapping. But this is a one to one mapping only. I also tried using the <collection>tag for mapping. Still I get the same error.
如果我的理解是正确的，尝试映射到 hashMap 也可以视为关联映射。但这只是一对一的映射。我也尝试使用<collection>标签进行映射。我仍然得到同样的错误。
采纳答案by Andy
You'll need to implement a ResultHandlerto build a Hashmap unfortunately.
不幸的是，您需要实现一个ResultHandler来构建一个 Hashmap。
Also, the DTD error you mention is because the result elements must be before the association elements.
此外，您提到的 DTD 错误是因为结果元素必须在关联元素之前。
