mybatis动态sql之Map参数的讲解

mybatis 动态sql之Map参数

Mapper文件:

<mapper namespace="com.cn.shoje.oa.modules.logistics.dao.PurcDao">

<select id="findAll" parameterType="Map" resultType="Purchase">

select * from prod_purchase where 1=1

<if test="purc_id!=''"> and purc_id=#{purc_id}</if>

<if test="prod_id!=''"> and prod_id=#{prod_id}</if>

<if test="ch_id!=''"> and ch_id=#{ch_id}</if>

<if test="ch_name!=''"> and ch_id in ( select ch_id from channel where ch_name

like '%#{ch_name}%')</if>

<if test="purc_time!=''"> and purc_time=#{purc_time} order by #{purc_time} desc

</if>

</select>

</mapper>

test表达式中不用再加#,$之类的取值符了,就直接这样写就可以取到map中key所对应的值,而其他地方需要有#{map中的key}来取得map中该key所对应的值

<pre name="code" class="html">

后台传递到mybatis的map参数,不要深究函数含义,知道下面这个map最终是传递到mybatis中的parameterType就够了

public Map<String,String> parseMap(HttpServletRequest req){

Map<String,String> map=new HashMap<String,String>();

map.put("prod_id", prod_id);

map.put("purc_id", purc_id );

map.put("ch_name", ch_name );

map.put("ch_id", ch_id);

map.put("purc_time", purc_time);

return map;

}

Mybatis传入参数类型为Map

方式一:

mybatis更新sql语句:

<update id="publishT00_notice" parameterType="Map">

update test

set createdate = #{createdate},

creator = #{creator}

where id in

<foreach collection="ids" item="ids" separator="," open="(" close=")">

#{ids}

</foreach>

</update>

传入map参数类型:

HashMap<String,Object> map = new HashMap<String, Object>();

map.put("creator", "creator");

map.put("createdate", "createdate");

String[] ids = {"1","2"};

map.put("ids", ids );

方式二:

第一步在你的mapper写上:

List<WeixinUserLocationList> findweixinUserLocations(@Param("params") Map<String, Object> map);

注意就是注解@param 这个,是mybatis的

然后在xml中这样写:

<if test="params.accountId!=null">

and a.accountid=#{params.accountId}

</if>

<if test="params.nickname!=null and params.nickname !=''">

and a.nickname like '%${params.nickname}%'

</if>

<if test="params.beginDate!=null and params.beginDate!=''">

and date_format(a.createtime,'%Y-%m-%d')>=${params.beginDate}

</if>

<if test="params.endDate!=null and params.endDate!=''">

<![CDATA[ and date_format(a.createtime,'%Y-%m-%d')<=${params.endDate} ]]>

</if>

${params.nickname}这种写法参数默认是传字符串,#{params.accountId}可以取Long,Integer之类的。

总结

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