1、參數個數為1個(string或者int)
dao層方法為以下兩種:
- /**
- * 單個int型
- */
- public List<UserComment> findByDepartmentId(int dapartmentId);
- /**
- * 單個string型
- */
- public Source findByTitle(String title);
對應的Mapper取值:
取值時應當注意,參數名字應該與dao層傳入的參數名字相同。
- /*單個int型*/
- <select id="findByDepartmentId" resultType="com.bonc.wechat.entity.publicserver.UserComment">
- select * from wx_user_comment where
- department_id=#{departmentId}
- order by createtime desc;
- </select>
- /*單個string型*/
- <select id="findByTitle" parameterType="java.lang.String" resultType="com.bonc.wechat.entity.publicserver.Source">
- select * from wx_source where
- title=#{title};
- </select>
- /*****或者直接使用通用方法獲取參數*****/
- <select id="findByDepartmentId" resultType="com.bonc.wechat.entity.publicserver.UserComment">
- select * from wx_user_comment where
- department_id=#{_parameter}
- order by createtime desc;
- </select>
- <select id="findByTitle" parameterType="java.lang.String" resultType="com.bonc.wechat.entity.publicserver.Source">
- select * from wx_source where
- title=#{_parameter};
- </select>
2、參數個數為多個。
dao層方法:
- /*****1.正常傳參*****/
- public Dailyuserinfo findStutaByUserAndDaily(String username,String dailyid);
- /*****2.注解傳參*****/
- public List<UserTab> selectUserListExceptUserId
- (@Param("USER_ID")String USER_ID,
- @Param("LIMIT_POS")int LIMIT_POS,
- @Param("LIMIT_SIZE")int LIMIT_SIZE);
對應的Mapper取值:
取值時應當注意,參數名字應該與dao層傳入的參數名字相同。
- /****正常傳參方式參數獲取****/
- <select id="findStutaByUserAndDaily"
- parameterType="java.lang.String"
- resultType="com.thinkgem.jeesite.modules.dailynews.entity.Dailyuserinfo">
- select * from daily_user_info
- where login_name=#{username}
- And daily_id=#{dailyid};
- </select>
- /****注解傳參方式參數獲取****/
- <select id="selectUserListExceptUserId"
- resultMap="userResMap">
- select * from MH_USER
- where USER_ID!=#{USER_ID}
- and USER_STATE>9
- order by NICK_NAME
- limit #{LIMIT_POS},#{LIMIT_SIZE}
- </select>
3、參數為map的形式。
mapper中使用map的key取值。
dao中的方法。
- /*****1.參數為map*****/
- public List<Source> search(Map<String,Object> param);
- /***2.map的內部封裝***/
- Map<String,Object> param=new HashMap<String,Object>();
- param.put("page", (page-1)*pageSize);
- param.put("pageSize",pageSize);
- param.put("keyword","%"+keyword+"%");
- param.put("type",type);
- List<Source> sources=sourceDao.search(param);
對應的Mapper取值:
- <select id="search"
- parameterType="java.util.Map"
- resultType="com.bonc.wechat.entity.publicserver.Source">
- select * from wx_source
- where
- <if test="keyword != null and keyword != ''">
- (title like #{keyword} or content like #{keyword}) and
- </if>
- type=#{type}
- order by ordernum asc
- limit #{page},#{pageSize};
- </select>
4、參數為對象。
mapper中使用對象中的屬性直接取值,或者【對象.屬性】取值。
dao中的方法。
- /*****使用對象傳參*****/
- public int addUserComment(UserComment UC);
- /*****對象中的屬性*****/
- private int id;
- private int department_id;
- private String telphone;
- private String content;
- private String createtime;
對應的Mapper取值:
- <insert id="addUserComment"
- parameterType="com.bonc.wechat.entity.publicserver.UserComment">
- insert into wx_user_comment
- (department_id,
- telphone,
- content,
- createtime)
- values(#{department_id},
- #{telphone},
- #{content},
- #{createtime});
- </insert>
*使用【對象.屬性】取值。
dao層:
- /******此示例中直接省去dao層,service直接綁定mapper層******/
- public PageResult findPanoramaPage(Page page) throws Exception{
- List<PageData> panoramaList = new ArrayList<PageData>();
- try {
- panoramaList = (List<PageData>)dao.findForList("PanoramaMapper.findPagePanorama", page);
- } catch (Exception e) {
- e.printStackTrace();
- }
- PageResult pageResult = new PageResult(page.getTotalResult(),panoramaList);
- return pageResult;
- }
對應的Mapper取值:
- <select id="findPagePanorama"
- parameterType="page"
- resultType="pd">
- SELECT
- a.id as id,
- a.project_code as projectCode,
- a.project_name as projectName,
- a.project_addr as projectAddr,
- a.project_type as projectType
- FROM
- calm_project a
- WHERE
- a.is_valid=1
- <if test="page.projectType != null and page.projectType != ''">
- AND a.project_type = #{page.projectType}
- </if>
- <if test="page.keyword != null and page.keyword != ''">
- AND (a.project_name LIKE '%${page.keyword}%' OR a.project_code LIKE '%${page.keyword}%')
- </if>
- ORDER BY
- a.sort
- </select>
推薦使用第三和第四種,將所傳的數據在controller層或者service層封裝起來,傳入mapper文件中取值。