Mybatis——动态sql之ifwhereforeach

Posted 2023-02-19 红颜莫知己

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<!-- 配置查询所有操作 -->
    <select id="findArticleByTitleOrAuthorOrSource" resultType="article">
        select * from t_article
        <where>
            <if test="source != null">
              and source = #source
            </if>
            <if test="author != null">
                and author = #author
            </if>
            <if test="title != null">
                and title = #title
            </if>
        </where>
    </select>

<select id="findById" parameterType="java.util.List" resultType="channel">
--         select * from where cid in (1,2,3,4)
        select * from t_channel
        <where>
            <if test="isd != null and ids.size() > 0 "/>
              <foreach collection="ids" open="cid in (" close=")" item="cid" separator=",">
                #cid
              </foreach>
        </where>
    </select>

测试：

mapper = sqlSession.getMapper(ChannelDao.class);
        List<Integer> ids = Arrays.asList(1,2,3,4);
        List<Channel> list = mapper.findChannelById(ids)

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