Mybatis 中在xxx.mapper書寫模糊查詢

1.在mybatis中，書寫sql，有時候會有一些不細心，如：

1. <!-- 首頁商品 關鍵字搜索-->
2. < select id="getGoodsByLikeTitle" resultMap="BaseResultMap">
3. SELECT
4. <!-- 詳情 -->
5. gd.pay_price,
6. gd.id,
7. gd.couponamount,
8. gd.sale_point,
9. gd.earn_point,
10. gd.stock_quantity,
11. gd.site_id,
12. gd.vip_level,
13. <!-- 商品 -->
14. g.id AS 'goodId',
15. g.title AS 'goodTitle',
16. g.img_url AS 'goodImgUrl',
17. g.sale_price AS 'goodSalePrice',
18. g.sale_count AS 'goodSaleCount',
19. g.link_url AS 'goodLinkUrl',
20. g.tags AS 'goodTags',
21. g.summary AS 'goodSummary',
22. g.series_no AS 'goodSeriesNo',
23. g.spec_desc AS 'goodSpecDesc',
24. g.weight AS 'goodWeight',
25. g.add_time AS 'goodAddTime'
26. FROM goods_detail AS gd
27. INNER JOIN goods AS g
28. ON gd.goods_id=g.id
29. WHERE g.satus=1
30. AND gd.site_id=#{siteId}
31. AND g.title like CONCAT('%',#{wkeyword},'%')
32. ORDER BY g.add_time DESC
33. </ select>

如果上述中的sql like 后面用的是'%${wkeyword}%',看似沒有錯，但你在調用時輸入“ ` ”引號間的符號，sql 就無法識別，即會報錯。如果用CONCAT('%',#{wkeyword},'%') 來替代'%${wkeyword}%'，則萬事大吉。具體這個是怎樣一個原理不是太清楚，看了很多文檔都說是#{}與${}的不同，自己積累一下，避免后期遇到。