<?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.iailab.module.model.mcs.pre.dao.MmItemOutputDao"> <select id="queryList" resultType="com.iailab.module.model.mcs.pre.dto.MmItemOutputDTO"> select * from t_mm_item_output t <where> <if test="params.itemid != null and params.itemid != ''"> AND t.itemid LIKE CONCAT('%', #{params.itemid},'%') </if> </where> </select> </mapper>