gold-java/src/main/resources/mapper/MarketMapper.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.example.demo.mapper.coin.MarketMapper">
    <select id="getMarket" resultType="com.example.demo.domain.entity.Market">
        select * from market
    </select>

    <!-- 根据名称列表查询对应的市场ID及其子市场ID -->
    <select id="getMarketIds" parameterType="java.util.List" resultType="java.lang.String">
        SELECT id
        FROM market
        WHERE
        -- 匹配名称的市场ID
        name IN
        <foreach collection="list" item="name" open="(" separator="," close=")">
            #{name}
        </foreach>
        OR
        -- 父ID是上述市场ID的子市场
        parent_id IN (
        SELECT id
        FROM market
        WHERE name IN
        <foreach collection="list" item="name" open="(" separator="," close=")">
            #{name}
        </foreach>
        )
    </select>
    <select id="getMarketId" resultType="java.lang.String">
        select id from market where name=#{market}
    </select>
    <select id="getMarketIdDao" resultType="com.example.demo.domain.entity.Market">
        select * from markets where name=#{country}
    </select>
    <select id="getMarketIdBytype" resultType="com.example.demo.domain.entity.Market">
        select * from market where parent_id=#{parentId}
    </select>
    <select id="getMarketById" resultType="java.lang.String">
        select name from market where id=#{market}
    </select>
    <select id="getMarketByIds" resultType="com.example.demo.domain.entity.Market">
        select id, name from market
        where 1 = 0
        <if test="marketIds != null and marketIds.size() > 0">
            OR id IN
            <foreach collection="marketIds" item="marketId" open="(" separator="," close=")">
                #{marketId}
            </foreach>
        </if>
    </select>
</mapper>