urbanops-module-gloabl/src/main/resources/mapper/mechanicalcost/MechanicalCostMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zteits.urbanops.module.garden.dal.mysql.mechanicalcost.MechanicalCostMapper">
    <select id="selectDuplicateIds" resultType="java.lang.Long">
        SELECT id
        FROM td_mechanical_cost
        WHERE
        <foreach collection="keyList" item="key" separator="OR">
            mech_code =#{key.mechCode}
        </foreach>
    </select>
</mapper>