How to select a java.util.List of objects using a mybatis resultMap association and select

Question

I have this almost working.

<mapper namespace="com.xyz.rb.dao.RBCellDao">
    <resultMap id="rbCellResultMap" type="com.xyz.rb.model.RBCell">
        <id property="id" column="id" />
        <result property="fieldIds" column="fieldIds" typeHandler="com.xyz.dao.typehandlers.CommaSeparatedLongListTypeHandler" />
        <association property="fields" column="fieldIds" javaType="java.util.List" select="selectFields"></association>
    </resultMap>

    <select id="selectFields" parameterType="String" resultType="com.xyz.abc.model.Field">
        SELECT * FROM fields WHERE id IN (#{value}) <!-- this appears to get the correct value ====> Parameters: 1,2,3(String) -->
    </select>
</mapper>

RBCell Table data looks like:

| ID | FIELDIDS      |  
|  1 | 1,2,3         | 
|  2 | 45,54321,9,78 |

This is returning a List as expect, HOWEVER, there is only ever one entry in the List no matter what value is in the FieldIds column...

What am I missing here? How can I get this to return the entire list of Field instead of what appears to be only the first one?

Answer 1

Between main query and associated query, the parameter is string exactly. So use parameter in associated query just like this:

SELECT * FROM fields WHERE id IN ('1,2,3');

if you want do the in thing, assumed you used mysql, you can try find_in_set :

SELECT * FROM fields WHERE FIND_IN_SET(id, #{value});

Else, you can try like to do this.

Answer 2

This ended up being simply to change:

SELECT * FROM fields WHERE id IN (#{value}) to SELECT * FROM fields WHERE id IN (${value})

It works now.