tlias管理系统--部门管理--分页查询实现

tlias-web-management/pom.xml

@@ -62,6 +62,9 @@
                     <source>11</source>
                     <target>11</target>
                     <encoding>UTF-8</encoding>
+                    <compilerArgs>
+                        <arg>-parameters</arg>
+                    </compilerArgs>
                 </configuration>
             </plugin>
             <plugin>

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

@@ -1,7 +1,38 @@
 package com.inmind.controller;
 
+import com.inmind.pojo.PageBean;
+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.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
+@RequestMapping("/emps")
 @RestController
+@Slf4j
 public class EmpController {
+
+    @Autowired
+    private EmpService empService;
+
+    @GetMapping
+    public Result page(
+             @RequestParam(defaultValue = "1") Integer page
+            ,@RequestParam(defaultValue = "10") Integer pageSize){
+        /*if (page == null) {
+            page = 1;
+        }
+
+        if (pageSize == null) {
+            pageSize = 10;
+        }*/
+
+        log.info("分页查询：{}，{}",page,pageSize);
+        //调用员工业务层的分页查询功能
+        PageBean pageBean =  empService.page(page,pageSize);
+        return Result.success(pageBean);
+    }
 }

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

@@ -1,7 +1,21 @@
 package com.inmind.mapper;
 
+import com.inmind.pojo.Emp;
 import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
 
 @Mapper
 public interface EmpMapper {
+    /**
+     * 查询总记录数
+     * @return
+     */
+    @Select("select count(*) from emp")
+    Long getTotal();
+
+    @Select("select * from emp limit #{startIndex},#{pageSize}")
+    List<Emp> getPageList(int startIndex,int pageSize);
+
 }

tlias-web-management/src/main/java/com/inmind/pojo/PageBean.java

@@ -0,0 +1,20 @@
+package com.inmind.pojo;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+import java.util.List;
+
+/**
+ * 分页查询结果封装类
+ *          分页的总记录数
+ *          当前页的数据列表数据
+ */
+@Data
+@NoArgsConstructor
+@AllArgsConstructor
+public class PageBean {
+    private Long total;
+    private List rows;
+}

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

@@ -1,4 +1,13 @@
 package com.inmind.service;
 
+import com.inmind.pojo.PageBean;
+
 public interface EmpService {
+    /**
+     * 分页查询
+     * @param page
+     * @param pageSize
+     * @return
+     */
+    PageBean page(Integer page, Integer pageSize);
 }

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

@@ -1,8 +1,43 @@
 package com.inmind.service.impl;
 
+import com.inmind.mapper.EmpMapper;
+import com.inmind.pojo.Emp;
+import com.inmind.pojo.PageBean;
 import com.inmind.service.EmpService;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
+import java.util.List;
+
 @Service
 public class EmpServiceImpl implements EmpService {
+
+    @Autowired
+    private EmpMapper empMapper;
+
+    /**
+     * 分页查询
+     * @param page 页码
+     * @param pageSize 每页显示条数
+     * @return
+     */
+    @Override
+    public PageBean page(Integer page, Integer pageSize) {
+        //1.获取总记录数
+        Long total = empMapper.getTotal();
+        //2.获取当前页的数据列表
+        /*
+        -- 分页查询 ：select * from emp limit 参数1 参数2
+        -- 参数1：起始索引         就是（页码-1）*每页显示的记录数
+        -- 参数2：查询返回的记录数  就是每页显示的记录数
+         */
+        int startIndex = (page - 1)* pageSize;
+        List<Emp> rows =  empMapper.getPageList(startIndex,pageSize);
+        //3.封装成分页查询结果，并返回
+        /*PageBean pageBean = new PageBean();
+        pageBean.setRows(rows);
+        pageBean.setTotal(total);
+        return pageBean;*/
+        return new PageBean(total, rows);
+    }
 }