使用pagehelper插件进行分页查询

一、导入mybatis和pagehelper坐标

<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.2.0</version>
</dependency>
<dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.3.0</version>
</dependency>

二、配置数据库

spring:main:allow-circular-references: truedatasource:druid:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/x_take_out?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowPublicKeyRetrieval=trueusername: rootpassword: root

三、编写代码实现分页

EmployeePageQueryDTO.java

@Data
public class EmployeePageQueryDTO implements Serializable {//员工姓名private String name;//页码private int page;//每页显示记录数private int pageSize;}

EmployeeMapper.java

@Mapper
public interface EmployeeMapper {/*** 分页查询** @param employeePageQueryDTO* @return*/Page<Employee> pageQuery(EmployeePageQueryDTO employeePageQueryDTO);
}

EmployeeMapper.xml

    <select id="pageQuery" resultType="top.weiyuexin.x.entity.Employee">select *from employee<where><if test="name != null and name != ''">and name like concat('%',#{name},'%')</if></where>order by create_time desc</select>

EmployeeServiceImpl.java

/*** 员工分页查询** @param employeePageQueryDTO* @return*/@Overridepublic PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {// select * from employee limit 0,10// 使用PageHelper插件进行分页查询PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);return new PageResult(page.getTotal(), page.getResult());}