Mybatis——動態sql+字串匹配導致的判斷問題
阿新 • • 發佈:2020-08-09
在mybatis的學習中,狂神建議字串匹配直接將模糊匹配的符號放在字串中,如:匹配'keWord',那麼實際所使用的引數應該為'%keyWord%'
map.put("keyWord","%" + keyWord + "%");
<select id="getUserLikeGaojianList" parameterType="map" resultMap="userLikeGaojianEntity"> SELECT * FROM news_base_gaojian g LEFT JOIN news_base_gaojian_like l ON l.gid=g.gj_id and l.uid = #{uId} and type=2 <where> is_delete = 0 AND gj_user_type = #{userType} AND gj_hash_p = #{gjHashP} <if test="tougaoState != null"> AND gj_tougao_pingtai_num >= #{tougaoState} </if> <if test="gjType != null"> AND gj_type = #{gjType} </if> <if test="keyWord != null "> AND ( gj_title LIKE #{keyWord} OR gj_title2 LIKE #{keyWord} OR gj_bianji LIKE #{keyWord} OR gj_laiyuan LIKE #{keyWord} OR gj_excerpt LIKE #{keyWord}) </if> <if test="date1 != null and date2 != null"> AND gj_lasttime <= #{date1} AND >= #{date2} </if> </where> LIMIT 0,20 </select>
注意:此時就不能用keyWord != null做為動態sql中test的引數,因為當關鍵字keyWord為空時,keyWord="%null%"
解決方案:
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修改.xml檔案
<select id="getUserLikeGaojianList" parameterType="map" resultMap="userLikeGaojianEntity"> SELECT * FROM news_base_gaojian g LEFT JOIN news_base_gaojian_like l ON l.gid=g.gj_id and l.uid = #{uId} and type=2 <where> is_delete = 0 AND gj_user_type = #{userType} AND gj_hash_p = #{gjHashP} <if test="tougaoState != null"> AND gj_tougao_pingtai_num >= #{tougaoState} </if> <if test="gjType != null"> AND gj_type = #{gjType} </if> <if test="keyWord != '%null%' "> AND ( gj_title LIKE #{keyWord} OR gj_title2 LIKE #{keyWord} OR gj_bianji LIKE #{keyWord} OR gj_laiyuan LIKE #{keyWord} OR gj_excerpt LIKE #{keyWord}) </if> <if test="date1 != null and date2 != null"> AND gj_lasttime <= #{date1} AND >= #{date2} </if> </where> LIMIT 0,20 </select>
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修改service層
<if test="keyWord != null "> AND ( gj_title LIKE #{keyWord} OR gj_title2 LIKE #{keyWord} OR gj_bianji LIKE #{keyWord} OR gj_laiyuan LIKE #{keyWord} OR gj_excerpt LIKE #{keyWord}) </if>