mybatis中使用mysql的模糊查询字符串拼接(like)

方法一:


<!--  根据hid,hanme,grade,模糊查询医院信息-->

方法一:
List<Hospital> getHospitalLike(@Param("selectword") String selectword);
<select id="getHospitalLike" resultType="com.hand.hand.domain.Hospital">
SELECT *
FROM hospital
where hid=cast(#{selectword} as signed INTEGER ) OR hname like concat('%',#{selectword},'%')
OR grade like concat('%',#{selectword},'%')
</select>

 where hid=cast(#{selectword} as signed INTEGER )  hid为Integer类型,而参数selectword为string类型,所以用cast将string转化为Integer
where hname like concat('%',#{selectword},'%') 字符串拼接,将%和selectword拼接成%selectword% 方法二:动态sql中的bind
List<Hospital> getHospitalLike(@Param("selectword") String selectword);
<select id="getHospitalLike" resultType="com.hand.hand.domain.Hospital">
<bind name="bindselectword" value="'%'+selectword+'%'"></bind>
SELECT *
FROM hospital
<if test="selectword!=null">
where hid=cast(#{selectword} as signed INTEGER ) OR hname like #{bindselectword}
OR grade like #{bindselectword}
</if> </select> 方法三:
在service层直接拼接字符串,xml直接使用转入的参数

 此方法测试出错(参考博客后,测试出错):
<!--where hid like '%'||#{selectword}||'%' or hname like '%'||#{selectword}||'%' or grade like '%'||#{selectword}||'%'-->

其他拼接法,可参考:https://www.cnblogs.com/dushan/p/4766954.html
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