PageHelper(分页助手)使用教程

前言：

基于SSM(或者SpringBoot)使用的，可以快速完成分页的需求。

使用步骤

导入对应的包(pagehelper)，下面是对应的pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.12.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--引入mybatis插件--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><!-- 分页处理引入包 --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>1.2.3</version></dependency><!--MySQL依赖--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.21</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

配置配置其他层

controller层

package com.example.demo.controller;import com.example.demo.domain.Hospital;
import com.example.demo.service.TestService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController
public class TestController {@AutowiredTestService testService;@GetMapping("/list")  //等价于@RequestMapping(method = RequestMethod.GET)//@RequestParam是将请求参数绑定到控制器的方法参数上public Object listPages(@RequestParam int pageNum, @RequestParam int pageSize) {PageHelper.startPage(pageNum, pageSize);List<Hospital> hospital = testService.selectAll();return new PageInfo<>(hospital);}
}

Service层

package com.example.demo.service;import com.example.demo.domain.Hospital;
import com.example.demo.mapper.TestMapper;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;@Service
public class TestService {@AutowiredTestMapper testMapper;public List<Hospital> selectAll() {return testMapper.selectAll();}
}

mapper层

package com.example.demo.mapper;import com.example.demo.domain.Hospital;import org.apache.ibatis.annotations.Mapper;import java.util.List;@Mapper
public interface TestMapper {List<Hospital> selectAll();
}

实体层

package com.example.demo.domain;public class Hospital {private long id;private String hospitalName;private String hospitalArea;private String hospitalImg;private String hospitalDeanName;private String hospitalYear;private String hospitalNature;private String hospitalGrade;private long hospitalOfficesNum;private long medicalInsuranceNum;private long hospitalBedNum;private long outpatientNum;private String isMedicalInsurance;private String hospitalEquipment;private String hospitalAbout;private String hospitalHonor;private String hospitalUrl;private String hospitalPhone;private String hospitalAddress;private String hospitalPostCode;private String hospitalBusRoute;private long isOpen;public long getId() {return id;}public void setId(long id) {this.id = id;}public String getHospitalName() {return hospitalName;}public void setHospitalName(String hospitalName) {this.hospitalName = hospitalName;}public String getHospitalArea() {return hospitalArea;}public void setHospitalArea(String hospitalArea) {this.hospitalArea = hospitalArea;}public String getHospitalImg() {return hospitalImg;}public void setHospitalImg(String hospitalImg) {this.hospitalImg = hospitalImg;}public String getHospitalDeanName() {return hospitalDeanName;}public void setHospitalDeanName(String hospitalDeanName) {this.hospitalDeanName = hospitalDeanName;}public String getHospitalYear() {return hospitalYear;}public void setHospitalYear(String hospitalYear) {this.hospitalYear = hospitalYear;}public String getHospitalNature() {return hospitalNature;}public void setHospitalNature(String hospitalNature) {this.hospitalNature = hospitalNature;}public String getHospitalGrade() {return hospitalGrade;}public void setHospitalGrade(String hospitalGrade) {this.hospitalGrade = hospitalGrade;}public long getHospitalOfficesNum() {return hospitalOfficesNum;}public void setHospitalOfficesNum(long hospitalOfficesNum) {this.hospitalOfficesNum = hospitalOfficesNum;}public long getMedicalInsuranceNum() {return medicalInsuranceNum;}public void setMedicalInsuranceNum(long medicalInsuranceNum) {this.medicalInsuranceNum = medicalInsuranceNum;}public long getHospitalBedNum() {return hospitalBedNum;}public void setHospitalBedNum(long hospitalBedNum) {this.hospitalBedNum = hospitalBedNum;}public long getOutpatientNum() {return outpatientNum;}public void setOutpatientNum(long outpatientNum) {this.outpatientNum = outpatientNum;}public String getIsMedicalInsurance() {return isMedicalInsurance;}public void setIsMedicalInsurance(String isMedicalInsurance) {this.isMedicalInsurance = isMedicalInsurance;}public String getHospitalEquipment() {return hospitalEquipment;}public void setHospitalEquipment(String hospitalEquipment) {this.hospitalEquipment = hospitalEquipment;}public String getHospitalAbout() {return hospitalAbout;}public void setHospitalAbout(String hospitalAbout) {this.hospitalAbout = hospitalAbout;}public String getHospitalHonor() {return hospitalHonor;}public void setHospitalHonor(String hospitalHonor) {this.hospitalHonor = hospitalHonor;}public String getHospitalUrl() {return hospitalUrl;}public void setHospitalUrl(String hospitalUrl) {this.hospitalUrl = hospitalUrl;}public String getHospitalPhone() {return hospitalPhone;}public void setHospitalPhone(String hospitalPhone) {this.hospitalPhone = hospitalPhone;}public String getHospitalAddress() {return hospitalAddress;}public void setHospitalAddress(String hospitalAddress) {this.hospitalAddress = hospitalAddress;}public String getHospitalPostCode() {return hospitalPostCode;}public void setHospitalPostCode(String hospitalPostCode) {this.hospitalPostCode = hospitalPostCode;}public String getHospitalBusRoute() {return hospitalBusRoute;}public void setHospitalBusRoute(String hospitalBusRoute) {this.hospitalBusRoute = hospitalBusRoute;}public long getIsOpen() {return isOpen;}public void setIsOpen(long isOpen) {this.isOpen = isOpen;}}

mybatis层

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.mapper.TestMapper"><select id="selectAll" resultType="com.example.demo.domain.Hospital">select *  from hospital</select>
</mapper>

配置层

server:port: 8080address: 127.0.0.1#配置pagehelper的内容
pagehelper:helper-dialect: mysql#配置spring的连接
spring:datasource:username: rootpassword: rooturl: jdbc:mysql://127.0.0.1:3306/hosdb?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTCmybatis:mapper-locations: classpath:mabatis/*.xmlconfiguration:#开启驼峰功能map-underscore-to-camel-case: true

测试结果

http://localhost:8080/list?pageNum=1&pageSize=5

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PageHelper(分页助手)使用教程

前言：

使用步骤

测试结果

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