分页插件pagehelper
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分页插件使用步骤
添加依赖
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<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.2.0</version>
</dependency>
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配置分页插件
在MyBatis的核心配置文件中配置插件
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| <plugins>
<plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
</plugins>
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| public class PageHelper {
@Test
public void testPageHelper(){
try {
InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
SqlSession openSession = sqlSessionFactory.openSession(true);
EmpMapper mapper = openSession.getMapper(EmpMapper.class);
com.github.pagehelper.PageHelper.startPage(1,3);
EmpExample example = new EmpExample();
example.createCriteria().andGenderEqualTo("1");
List<Emp> list = mapper.selectByExample(example);
for (Emp emp : list) {
System.out.println(emp);
}
} catch (IOException e) {
e.printStackTrace();
}
}
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| DEBUG 03-01 00:03:51,018 Cache Hit Ratio [SQL_CACHE]: 0.0 (LoggingCache.java:60)
DEBUG 03-01 00:03:51,168 ==> Preparing: SELECT count(0) FROM tbl_employee WHERE (gender = ?) (BaseJdbcLogger.java:137)
DEBUG 03-01 00:03:51,188 ==> Parameters: 1(String) (BaseJdbcLogger.java:137)
DEBUG 03-01 00:03:51,248 <== Total: 1 (BaseJdbcLogger.java:137)
DEBUG 03-01 00:03:51,248 ==> Preparing: select id, last_name, gender, email, d_id from tbl_employee WHERE ( gender = ? ) LIMIT ? (BaseJdbcLogger.java:137)
DEBUG 03-01 00:03:51,248 ==> Parameters: 1(String), 3(Integer) (BaseJdbcLogger.java:137)
DEBUG 03-01 00:03:51,278 <== Total: 3 (BaseJdbcLogger.java:137)
Emp{id=1, lastName='admin', gender='1', email='123@qq.com', dId=1}
Emp{id=3, lastName='jerry', gender='1', email='jerry@123.com', dId=null}
Emp{id=5, lastName='frank', gender='1', email='frank@athome.com', dId=2}
Process finished with exit code 0
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分页插件的使用
- 在查询功能之前使用PageHelper.startPage(int pageNum, int pageSize)开启分页功能
pageNum：当前页的页码
pageSize：每页显示的条数
- 在查询获取list集合之后，使用PageInfo pageInfo = new PageInfo<>(List list, int navigatePages)获取分页相关数据
list：分页之后的数据
navigatePages：导航分页的页码数
PageInfo{ pageNum=8, pageSize=4, size=2, startRow=29, endRow=30, total=30, pages=8, list=Page{count=true, pageNum=8, pageSize=4, startRow=28, endRow=32, total=30, pages=8, reasonable=false, pageSizeZero=false}, prePage=7, nextPage=0, isFirstPage=false, isLastPage=true, hasPreviousPage=true, hasNextPage=false, navigatePages=5, navigateFirstPage4, navigateLastPage8, navigatepageNums=[4, 5, 6, 7, 8] }
常用数据：
pageNum：当前页的页码
pageSize：每页显示的条数
size：当前页显示的真实条数
total：总记录数
pages：总页数
prePage：上一页的页码
nextPage：下一页的页码
isFirstPage/isLastPage：是否为第一页/最后一页
hasPreviousPage/hasNextPage：是否存在上一页/下一页
navigatePages：导航分页的页码数
navigatepageNums：导航分页的页码，[1,2,3,4,5]
