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  • 20200115 PageHelper

    简介

    PageHelper是Mybatis通用分页插件。

    SpringBoot、Mybatis、PageHelper

    1. pom.xml
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper-spring-boot-starter</artifactId>
        <version>1.2.3</version>
    </dependency>
    
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>2.1.1</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid-spring-boot-starter</artifactId>
        <version>1.1.10</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    
    1. 编写Mapper

    与Mybatis一样

    @Mapper
    public interface UserMapper {
        @Select("select * from user")
        Page<User> getAllUsers();
    
    }
    
    1. 使用PageHelper
    @SpringBootApplication
    public class PagehelperApplication {
    
        public static void main(String[] args) {
            ConfigurableApplicationContext ctx = SpringApplication.run(PagehelperApplication.class, args);
    
            // ==================== 用法一 =============================
            // PageHelper.startPage(1, 2);
            // test(ctx);
    
            // ==================== 用法二 =============================
            // PageHelper.offsetPage(2,2);
            // test(ctx);
    
            // ==================== 用法三 =============================
            SqlSessionFactory sessionFactory = ctx.getBean(SqlSessionFactory.class);
            System.out.println(sessionFactory);
            SqlSession sqlSession = sessionFactory.openSession();
            List<User> userList = sqlSession.selectList("study.hwj.pagehelper.user.UserMapper.getAllUsers",null, new RowBounds(0, 2));
            System.out.println(userList);
            userList.forEach(System.out::println);
        }
    
        private static void test(ConfigurableApplicationContext ctx){
            System.out.println("======================================");
            UserMapper userMapper = ctx.getBean(UserMapper.class);
            Page<User> page = userMapper.getAllUsers();
            System.out.println(page);
            page.forEach(System.out::println);
        }
    
    }
    

    参考资料

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  • 原文地址:https://www.cnblogs.com/huangwenjie/p/12198191.html
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