wxbase/src/main/resources/mybatis/MerchInfoMapper.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.ematou.wxbase.mapper.MerchInfoMapper">

    <sql id="merchInfoColumns">
        t.merch_sn,
        t.merch_name
    </sql>

    <!-- 插入商户信息 -->
    <insert id="insert">
        INSERT INTO merch_info(merch_sn, merch_name) VALUES (#{merchSn}, #{merchName});
    </insert>

    <!-- 根据条件查询商户信息 -->
    <select id="selectOne" resultType="com.ematou.wxbase.entity.MerchInfo">
        SELECT
            <include refid="merchInfoColumns" />
        FROM
            merch_info t
        <where>
            <if test="merchSn !=null and merchSn != '' ">
                and merch_sn = #{merchSn}
            </if>
            <if test="merchName !=null and merchName != '' ">
                and merch_name = #{merchName}
            </if>
        </where>
    </select>

</mapper>