PageHelper插件的使用

1.pom.xml引入依赖

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>5.1.11</version>
</dependency>

2.mybatis-config.xml配置分页插件

<plugins>
    <plugin interceptor="com.github.pagehelper.PageInterceptor">
        <property name="helperDialect" value="mysql"/>
    </plugin>
</plugins>

3.在查询方法中使用分页

@Test
public void testTeacherRelationshipToMulti() {

    TeacherMapper teacherMapper = session.getMapper(TeacherMapper.class);

    PageHelper.startPage(1,2);
    // 查询Customer对象同时将关联的Order集合查询出来
    List<Teacher> allTeachers = teacherMapper.findAllTeachers();
//
    PageInfo<Teacher> pageInfo = new PageInfo<>(allTeachers);

    System.out.println("pageInfo = " + pageInfo);
    long total = pageInfo.getTotal(); // 获取总记录数
    System.out.println("total = " + total);
    int pages = pageInfo.getPages();  // 获取总页数
    System.out.println("pages = " + pages);
    int pageNum = pageInfo.getPageNum(); // 获取当前页码
    System.out.println("pageNum = " + pageNum);
    int pageSize = pageInfo.getPageSize(); // 获取每页显示记录数
    System.out.println("pageSize = " + pageSize);
    List<Teacher> teachers = pageInfo.getList(); //获取查询页的数据集合
    System.out.println("teachers = " + teachers);
    teachers.forEach(System.out::println);

}