tlias管理系统-员工分页查询功能实现
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@@ -1,7 +1,25 @@
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package com.inmind.controller;
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import com.inmind.pojo.PageBean;
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import com.inmind.pojo.Result;
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import com.inmind.service.EmpService;
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import lombok.extern.slf4j.Slf4j;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RestController;
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@RestController
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@Slf4j
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public class EmpController {
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@Autowired
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private EmpService empService;
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@GetMapping("/emps")
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public Result page(Integer page,Integer pageSize){
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log.info("分页查询,参数page :{};pageSize:{}",page,pageSize);
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//调用业务层获取分页结果数据
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PageBean pageBean = empService.page(page,pageSize);
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return Result.success(pageBean);
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}
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}
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@@ -1,7 +1,24 @@
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package com.inmind.mapper;
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import com.inmind.pojo.Emp;
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import org.apache.ibatis.annotations.Mapper;
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import org.apache.ibatis.annotations.Select;
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import java.util.List;
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@Mapper
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public interface EmpMapper {
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//查询总记录数
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@Select("select count(*) from emp")
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Long getTotal();
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/*
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分页查询 limit
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参数1:起始索引 就是 (页码-1)*每页展示的记录数
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参数2:查询返回记录数 就是 每页展示的记录数
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*/
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//分页查询获取员工列表数据
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@Select("select * from emp limit #{startIndex},#{pageSize};")
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List<Emp> getPageList(Integer startIndex,Integer pageSize);
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}
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@@ -0,0 +1,18 @@
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package com.inmind.pojo;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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import java.util.List;
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/*
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分页查询结果封装类
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*/
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@Data
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@NoArgsConstructor
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@AllArgsConstructor
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public class PageBean {
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private Long total;//总记录数
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private List rows;//数据列表
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}
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@@ -1,4 +1,8 @@
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package com.inmind.service;
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import com.inmind.pojo.PageBean;
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public interface EmpService {
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//分页查询员工列表数据
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PageBean page(Integer page, Integer pageSize);
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}
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@@ -1,8 +1,32 @@
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package com.inmind.service.impl;
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import com.inmind.mapper.EmpMapper;
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import com.inmind.pojo.Emp;
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import com.inmind.pojo.PageBean;
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import com.inmind.service.EmpService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import java.util.List;
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@Service
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public class EmpServiceImpl implements EmpService {
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@Autowired
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private EmpMapper empMapper;
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@Override
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public PageBean page(Integer page, Integer pageSize) {
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//1.调用mapper获取总记录数和分页的员工列表数据
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Long total = empMapper.getTotal();
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/*
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分页查询 limit
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参数1:起始索引 就是 (页码-1)*每页展示的记录数
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参数2:查询返回记录数 就是 每页展示的记录数
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*/
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int startIndex = (page - 1)*pageSize;
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List<Emp> empList = empMapper.getPageList(startIndex,pageSize);
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//2.封装pagebean对象
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PageBean pageBean = new PageBean(total, empList);
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return pageBean;
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}
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}
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