SpringBoot实现分类搜索（模糊）查询 Pageable分页
效果图如下：
数据库结构：
Student学生表
stu表
sid学生id
sname 学生姓名
sex性别
cid班级id
address地址
sorts 排序
classes班级表
cid cname
- 1801
- 1802
经过查找又发现了可以在sql语句里写一个case判断
解决了sql的外键判断为0不显示数据的尴尬，这样就可以写Integer
CASE WHEN :cc_id=0 THEN 1 ELSE cc_id=:cc_id END
在下面我放的是全部的代码，包含一些增删改查
底下有第二种方式，是之前写的，不是很友好
附上代码
StuDao
package com.msfh.news.dao;
import java.util.List;
import java.util.Map;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.PagingAndSortingRepository;
import com.msfh.news.eneity.Stu;
public interface StuDao extends PagingAndSortingRepository, JpaSpecificationExecutor {
//分页
@Query(value = "select * from stu join classes on stu.cc_id = classes.ccid where " +
" sname like CONCAT('%',:sname,'%')"
+ " and CASE WHEN :cc_id=0 THEN 1 ELSE cc_id=:cc_id END " +
" order by stu.sid asc",nativeQuery = true)
Page> findPage(Pageable pageable,String sname,Integer cc_id);
}
StuService层
package com.msfh.news.service;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import com.msfh.news.dao.StuDao;
import com.msfh.news.eneity.Stu;
import lombok.val;
@Service
public class StuService {
@Autowired
private StuDao stuDao;
/**
* 分页
* @return
*/
public Page> findPage(Pageable pageable,String sname,Integer cc_id){
return stuDao.findPage(pageable,sname,cc_id);
}
public void save(Stu stu) {
stuDao.save(stu);
}
public void delete(Stu stu) {
stuDao.delete(stu);
}
}
StuController
package com.msfh.news.controller;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.msfh.news.eneity.Banner;
import com.msfh.news.eneity.Stu;
import com.msfh.news.service.BannerService;
import com.msfh.news.service.StuService;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
@Controller
@RequestMapping("stu")
public class StuController {
@Autowired
private StuService stuService;
@RequestMapping("stu")
public String stu() {
return "/news/stu";
}
@RequestMapping("stuAdd")
public String stuAdd() {
return "/news/stuAdd";
}
/**
* ajax分页
* @return
*/
@RequestMapping("findPage")
@ResponseBody
public Page> findPage(HttpServletRequest request){
String sname = request.getParameter("sname");
Integer cc_id = Integer.parseInt(request.getParameter("ccid"));
Integer NowPage = Integer.parseInt(request.getParameter("NowPage"));
Pageable Page = PageRequest.of(NowPage-1, 3);
Page> data = stuService.findPage(Page,sname,cc_id);
return data;
}
@RequestMapping("save")
@ResponseBody
public JSONObject save(HttpServletRequest request) {
String stuData = request.getParameter("stuData");
JSONObject jsonObject = JSONObject.fromObject(stuData);
Stu stu = (Stu) jsonObject.toBean(jsonObject,Stu.class);
stuService.save(stu);
JSONObject data = new JSONObject();
data.put("status", "1");
data.put("success","添加成功");
return data;
}
@RequestMapping("delete")
@ResponseBody
public String delete(HttpServletRequest request) {
Integer sid = Integer.parseInt(request.getParameter("sid"));
Stu stu = new Stu();
stu.setSid(sid);
stuService.delete(stu);
return "删除成功";
}
@RequestMapping("deleteAll")
//@ResponseBody
public String deleteAll(HttpServletRequest request) {
String sids = request.getParameter("sids");
JSONArray jsonArray = JSONArray.fromObject(sids);
for (int i = 0; i < jsonArray.size(); i++) {
Stu stu = new Stu();
stu.setSid((Integer) jsonArray.get(i));
stuService.delete(stu);
}
return "news/stu";
}
}
stu.html
我们这个是vue配合springboot 实现分页效果和分类搜索的操作
这里我们dao层需要重写继承的方法，同时也需要重写sql语句的query需要完全执行sql语句
我们在dao层写的是String cid可是我们的cid是外键应该是Integer的，但是因为我们执行了Integer的条件它就是一个sql语句了
所以我在html给赋的初值为null，然后我再controller接受的为String型
StuDao
package com.msfh.news.dao;
import java.util.List;
import java.util.Map;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.PagingAndSortingRepository;
import com.msfh.news.eneity.Stu;
public interface StuDao extends PagingAndSortingRepository, JpaSpecificationExecutor {
//分页
@Query(value = "select * from stu join classes on stu.cc_id = classes.ccid where" +
" sname like CONCAT('%',:sname,'%')"
+ " and cc_id like CONCAT('%',:cc_id,'%') order by stu.sid asc",nativeQuery = true)
Page> findPage(Pageable pageable,String sname,String cc_id);
}
StuService层
package com.msfh.news.service;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import com.msfh.news.dao.StuDao;
import com.msfh.news.eneity.Stu;
import lombok.val;
@Service
public class StuService {
@Autowired
private StuDao stuDao;
/**
* 分页
* @return
*/
public Page> findPage(Pageable pageable,String sname,String cc_id){
return stuDao.findPage(pageable,sname,cc_id);
}
}
StuController
package com.msfh.news.controller;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.msfh.news.eneity.Banner;
import com.msfh.news.eneity.Stu;
import com.msfh.news.service.BannerService;
import com.msfh.news.service.StuService;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
@Controller
@RequestMapping("stu")
public class StuController {
@Autowired
private StuService stuService;
@RequestMapping("stu")
public String stu() {
return "/news/stu";
}
@RequestMapping("stuAdd")
public String stuAdd() {
return "/news/stuAdd";
}
/**
* ajax分页
* @return
*/
@RequestMapping("findPage")
@ResponseBody
public Page> findPage(HttpServletRequest request){
String sname = request.getParameter("sname");
String cc_id = request.getParameter("ccid");
Integer NowPage = Integer.parseInt(request.getParameter("NowPage"));
Pageable Page = PageRequest.of(NowPage-1, 3);
Page> data = stuService.findPage(Page,sname,cc_id);
return data;
}
@RequestMapping("save")
@ResponseBody
public JSONObject save(HttpServletRequest request) {
String stuData = request.getParameter("stuData");
JSONObject jsonObject = JSONObject.fromObject(stuData);
Stu stu = (Stu) jsonObject.toBean(jsonObject,Stu.class);
stuService.save(stu);
JSONObject data = new JSONObject();
data.put("status", "1");
data.put("success","添加成功");
return data;
}
}
stu.html
这里我们写的分类查询我们是需要查出外键相匹配的值的表的数据
就如同效果图一样
我们需要通过ajax查出来然后进行一个循环，我再下面的班级查询有写的ajax部分，在HTML上面也有循环的部分，所有我就不附上classes的代码和图部分了