Mybatis-PageHelper 簡介

PageHelper 最方便使用的分頁外掛，支援多種資料庫：

Oracle
Mysql
MariaDB
SQLite
Hsqldb
PostgreSQL
DB2
SqlServer(2005,2008)
Informix
H2
SqlServer2012
Derby
Phoenix

依賴新增

buildscript {
    ext {
        springBootVersion = '2.0.2.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}"
 
)
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

group = 'com.yanjun'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
    mavenCentral()
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter'
 
,
            'org.springframework.boot:spring-boot-starter-web',
             )
    testCompile('org.springframework.boot:spring-boot-starter-test')

    runtime('mysql:mysql-connector-java')  //mysql驅動
    compile 'org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0'

    compile 'com.github.pagehelper:pagehelper-spring-boot-starter:1.2.3'
 
 //pagehelper
}

配置檔案 application.yml

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/mybatis
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    sql-script-encoding: UTF-8

pagehelper:
    helperDialect: mysql
    reasonable: true
    supportMethodsArguments: true
    params: count=countSql

server:
  port: 8023

實戰演練

建立實體類 User

public class User {

    Integer id;
    String name;
    Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

建立 Mapper 類 UserMapper

public interface UserMapper {

    @Select("select * from user")
    List<User> findAll();
}

建立 service 類 UserService

@Service
public class UserService {

    @Autowired
    UserMapper userMapper;

    public PageInfo findAll(int pageNum, int pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        List<User> userList = userMapper.findAll();
        PageInfo<User> pageInfo = new PageInfo<>(userList);
        return pageInfo;
    }
}

建立 controller 類 UserController

@RestController
public class UserController {

    @Autowired
    UserService userService;

    @GetMapping("findAll")
    public PageInfo getUser(int pageNum, int pageSize) {
        return userService.findAll(pageNum,pageSize);
    }
}

新增掃包註解

@SpringBootApplication
@MapperScan("com.yanjun.mybatis.mapper")

public class MybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(MybatisApplication.class, args);
    }
}

效果測試

總結

本文所有程式碼已經上傳至 GitHub ，分支 PageHelper

個人微訊號：zhaoyanjun125 , 歡迎關注