7、SpringBoot+Mybatis整合------PageHelper简单分页

开发工具：STS

代码下载链接：https://github.com/theIndoorTrain/SpringBoot_Mybatis/tree/1d30d2a573ce6784149a28af9b8afcab7414370c

PageHelper官方地址：https://pagehelper.github.io/

前言：

当我们操作数据库获取数据列表时，往往面对对查询数据进行分页的情况。

今天，我们使用PageHelper插件，来简单实现分页效果。

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一、Page简单使用

1.添加pom依赖：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xm</groupId>
    <artifactId>demo005_Mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo005_Mybatis</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!-- 添加PageHelper依赖 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

2.添加测试用例：

package com.xm;

import java.util.List;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.xm.mapper.StudentMapper;
import com.xm.pojo.Student;

@RunWith(SpringRunner.class)
@SpringBootTest
public class StudentTest {
    @Autowired
    private StudentMapper studentMapper;
    
    
    
    @Test
    public void pageText() {
        Page page = PageHelper.startPage(1, 5);
        List<Student> students = studentMapper.list();
        for(Student student : students) {
            System.out.println(student.toString());
        }
        System.out.println("当前页："+page.getPageNum());
        System.out.println("当前页数据数："+page.getPageSize());
        System.out.println("页总数："+page.getPages());
        System.out.println("数据总数："+page.getCountColumn());
        System.out.println("第3个数据详情："+page.get(2));
    }
    

}

3.测试结果：

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