Mybatis框架中Mapper文件传值参数获取。【Mybatis】
1、参数个数为1个(string或者int)
dao层方法为以下两种:
- /**
- * 单个int型
- */
- public List<UserComment> findByDepartmentId(int dapartmentId);
- /**
- * 单个string型
- */
- public Source findByTitle(String title);
对应的Mapper取值:
取值时应当注意,参数名字应该与dao层传入的参数名字相同。
- /*单个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>
- /*单个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获取参数*****/
- <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、参数个数为多个。
dao层方法:
- /*****1.正常传参*****/
- public Dailyuserinfo findStutaByUserAndDaily(String username,String dailyid);
- /*****2.注解传参*****/
- public List<UserTab> selectUserListExceptUserId
- (@Param("USER_ID")String USER_ID,
- @Param("LIMIT_POS")int LIMIT_POS,
- @Param("LIMIT_SIZE")int LIMIT_SIZE);
对应的Mapper取值:
取值时应当注意,参数名字应该与dao层传入的参数名字相同。
- /****正常传参方式参数获取****/
- <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>
- /****注解传参方式参数获取****/
- <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、参数为map的形式。
mapper中使用map的key取值。
dao中的方法。
- /*****1.参数为map*****/
- public List<Source> search(Map<String,Object> param);
- /***2.map的内部封装***/
- 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);
对应的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、参数为对象。
mapper中使用对象中的属性直接取值,或者【对象.属性】取值。
dao中的方法。
- /*****使用对象传参*****/
- public int addUserComment(UserComment UC);
- /*****对象中的属性*****/
- private int id;
- private int department_id;
- private String telphone;
- private String content;
- private String createtime;
对应的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【对象.属性】取值。
dao层:
- /******此示例中直接省去dao层,service直接绑定mapper层******/
- 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;
- }
对应的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>
推荐使用第三和第四种,将所传的数据在controller层或者service层封装起来,传入mapper文件中取值。