JdcProject/src/main/java/com/jdc/jdcproject/mapper/xml/FangpaishuiUnitMapper.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.jdc.jdcproject.mapper.FangpaishuiUnitMapper">

    <select id="findUnitByDetail" parameterType="com.jdc.jdcproject.entity.VO.FangpaishuiUnitVo" resultType="com.jdc.jdcproject.entity.VO.FangpaishuiUnitVo">
        select fn.*,
               e.equipmentName
        FROM fangpaishui_unit fn
        LEFT JOIN equipment e ON e.EquipmentId = fn.EquipmentId
        <where>
            <if test="UnitID !=0">
             and   fn.UnitID = #{UnitID}
            </if>
            <if test="equipmentName !=null">
            and    e.equipmentName like concat(concat('%',#{equipmentName}),'%')
            </if>
            <if test="UnitCode !=null">
             and   fn.UnitCode like concat(concat('%',#{UnitCode}),'%')
            </if>
        </where>
    </select>
</mapper>