<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>

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;
}

<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>

HashMap<String,Object> map = new HashMap<String, Object>();
map.put("creator", "creator");
map.put("createdate", "createdate");
String[] ids = {"1","2"};
map.put("ids", ids );

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

<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>