tlias管理系统-员工分页插件PageHelper查询功能实现

tlias-web-management/pom.xml

@@ -40,6 +40,12 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <!--分页插件依赖-->
+        <dependency>
+            <groupId>com.github.pagehelper</groupId>
+            <artifactId>pagehelper-spring-boot-starter</artifactId>
+            <version>1.4.2</version>
+        </dependency>
     </dependencies>
 
     <dependencyManagement>

tlias-web-management/src/main/java/com/inmind/controller/EmpController.java

@@ -5,9 +5,13 @@ import com.inmind.pojo.Result;
 import com.inmind.service.EmpService;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.format.annotation.DateTimeFormat;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+import java.time.LocalDate;
+
 @RestController
 @Slf4j
 public class EmpController {
@@ -16,8 +20,15 @@ public class EmpController {
     private EmpService empService;
 
     @GetMapping("/emps")
-    public Result page(Integer page,Integer pageSize){
-        log.info("分页查询，参数page ：{}；pageSize:{}",page,pageSize);
+    //@RequestParam(defaultValue = "1") 设置参数的默认值
+    public Result page(
+            String name,
+            Short gender,
+            @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate begin,
+            @DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate end,
+            @RequestParam(defaultValue = "1") Integer page
+            ,@RequestParam(defaultValue = "10") Integer pageSize){
+        log.info("分页查询，参数page ：{}；pageSize:{}----{},{},{},{}",page,pageSize,name,gender,begin,end);
         //调用业务层获取分页结果数据
         PageBean pageBean = empService.page(page,pageSize);
         return Result.success(pageBean);

tlias-web-management/src/main/java/com/inmind/mapper/EmpMapper.java

@@ -9,8 +9,8 @@ import java.util.List;
 @Mapper
 public interface EmpMapper {
     //查询总记录数
-    @Select("select count(*) from emp")
-    Long getTotal();
+    /*@Select("select count(*) from emp")
+    Long getTotal();*/
 
     /*
     分页查询 limit
@@ -18,7 +18,10 @@ public interface EmpMapper {
      参数2：查询返回记录数 就是  每页展示的记录数
      */
     //分页查询获取员工列表数据
-    @Select("select * from emp limit #{startIndex},#{pageSize};")
-    List<Emp> getPageList(Integer startIndex,Integer pageSize);
+    /*@Select("select * from emp limit #{startIndex},#{pageSize};")
+    List<Emp> getPageList(Integer startIndex,Integer pageSize);*/
 
+    //员工的基本查询sql
+    @Select("select * from emp")
+    public List<Emp> list();
 }

tlias-web-management/src/main/java/com/inmind/service/impl/EmpServiceImpl.java

@@ -1,5 +1,7 @@
 package com.inmind.service.impl;
 
+import com.github.pagehelper.Page;
+import com.github.pagehelper.PageHelper;
 import com.inmind.mapper.EmpMapper;
 import com.inmind.pojo.Emp;
 import com.inmind.pojo.PageBean;
@@ -14,19 +16,32 @@ public class EmpServiceImpl implements EmpService {
     @Autowired
     private EmpMapper empMapper;
 
-    @Override
+    /*@Override
     public PageBean page(Integer page, Integer pageSize) {
         //1.调用mapper获取总记录数和分页的员工列表数据
         Long total = empMapper.getTotal();
-        /*
+        *//*
         分页查询 limit
          参数1：起始索引      就是 （页码-1）*每页展示的记录数
          参数2：查询返回记录数 就是  每页展示的记录数
-         */
+         *//*
         int startIndex = (page - 1)*pageSize;
         List<Emp> empList =  empMapper.getPageList(startIndex,pageSize);
         //2.封装pagebean对象
         PageBean pageBean = new PageBean(total, empList);
         return pageBean;
+    }*/
+
+
+    @Override
+    public PageBean page(Integer page, Integer pageSize) {
+        //1.调用分页插件PageHelper的固定api，startPage
+        PageHelper.startPage(page, pageSize);
+        //2.执行原始的查询sql语句(此时已经被分页插件修改了底层sql，它返回值其实是一个Page类型对象)
+        List<Emp> empList = empMapper.list();
+        Page<Emp> p = (Page) empList;
+        //2.封装pagebean对象
+        PageBean pageBean = new PageBean(p.getTotal(), p.getResult());
+        return pageBean;
     }
 }