1.在mybatis中,书写sql,有时候会有一些不细心,如:
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<!-- 首页商品 关键字搜索-->
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<select id="getGoodsByLikeTitle" resultMap="BaseResultMap">
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SELECT
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<!-- 详情 -->
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gd.pay_price,
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gd.id,
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gd.couponamount,
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gd.sale_point,
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gd.earn_point,
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gd.stock_quantity,
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gd.site_id,
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gd.vip_level,
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<!-- 商品 -->
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g.id AS 'goodId',
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g.title AS 'goodTitle',
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g.img_url AS 'goodImgUrl',
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g.sale_price AS 'goodSalePrice',
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g.sale_count AS 'goodSaleCount',
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g.link_url AS 'goodLinkUrl',
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g.tags AS 'goodTags',
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g.summary AS 'goodSummary',
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g.series_no AS 'goodSeriesNo',
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g.spec_desc AS 'goodSpecDesc',
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g.weight AS 'goodWeight',
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g.add_time AS 'goodAddTime'
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FROM goods_detail AS gd
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INNER JOIN goods AS g
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ON gd.goods_id=g.id
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WHERE g.satus=1
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AND gd.site_id=
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AND g.title like CONCAT('%',#{wkeyword},'%')
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ORDER BY g.add_time DESC
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</select>
如果上述中的sql like 后面用的是'%${wkeyword}%',看似没有错,但你在调用时输入“ ` ”引号间的符号,sql 就无法识别,即会报错。如果用CONCAT('%',#{wkeyword},'%') 来替代'%${wkeyword}%',则万事大吉。具体这个是怎样一个原理不是太清楚,看了很多文档都说是#{}与${}的不同,自己积累一下,避免后期遇到。