mybatis-resultmap-用用户定义的值替换空值

Question

Mybatis resultMap Assign customized value to nullvalue I want to assign my customized value for nullValue returning column from my query. Below is my code snippet Advanced thanks for your help

  <resultMap id="abcd" class="abcdVO">
    <result property="ABC" column="Col1" nullValue="No"/>
    <result property="XYZ" column="Col2" nullValue=" "/>
  </resultMap>

  <select id="abcd" parameterType ="String" resultMap="abcdMap">
     Select Col1, Col2 from xyz
  </select>

Answer 1

Use COALESCE :

<select id="abcd" parameterType ="String" resultMap="abcdMap">
   Select COALESCE(Col1, 'No') as Col1, COALESCE(Col2, ' ') as Col2 from xyz
</select>