mybatis查询字段为null设置为0的操作

<sql id="Base_Column_List">
 ID, PREPAYMENT_FEE
 </sql>

<sql id="Base_Column_List">
 ID, ifnull(PREPAYMENT_FEE,0) as PREPAYMENT_FEE
 </sql>

<insert id="insertDemo" parameterType="java.util.Map">
INSERT INTO
 TABLE
<trim prefix="(" suffix=")" suffixOverrides=",">
 <if test="importRow != null and importRow != '' or importRow ==0 ">
 IMPORT_ROW,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
 <if test="importRow != null and importRow != '' or importRow ==0 ">
  #{importRow},
 </if>
</trim>
</insert>