mybatis扩展之使用PageHelper插件进行分页（是真好用）

首先引入相关的jar包：

然后是在Mybatis全局配置文件中配置：

    <plugins>
        plugin interceptor="com.github.pageHelper.PageInterceptor"></plugin>
    </>

就可以使用了。

EmployeeMapper.java中

    public List<Employee> getAllEmp();

EmployeeMapper.xml中

    select id="getAllEmp" resultType="com.gong.mybatis.bean.Employee">
        select * from tbl_employee
    select>

进行测试：首先是不带分页的测试

package com.gong.mybatis.test;

import java.io.IOException;
 java.io.InputStream;
 java.util.ArrayList;
 java.util.Arrays;
 java.util.HashMap;
 java.util.List;
 java.util.Map;

 org.apache.ibatis.io.Resources;
 org.apache.ibatis.session.sqlSession;
 org.apache.ibatis.session.sqlSessionFactory;
 org.apache.ibatis.session.sqlSessionFactoryBuilder;
 org.junit.Test;

 com.github.pageHelper.Page;
 com.github.pageHelper.pageHelper;
 com.github.pageHelper.PageInfo;
 com.gong.mybatis.bean.Department;
 com.gong.mybatis.bean.Employee;
 com.gong.mybatis.dao.EmployeeMapper;
 com.gong.mybatis.mapper.EmployeeMapperDynamicsql;

public class TestMybatis5 {
    
    public sqlSessionFactory getsqlSessionFactory() throws IOException {
        String resource = "mybatis-config.xml";
        InputStream is = Resources.getResourceAsStream(resource);
        return new sqlSessionFactoryBuilder().build(is);
    }

    @Test
    void test()  IOException {
        sqlSessionFactory sqlSessionFactory = getsqlSessionFactory();
        sqlSession openSession = sqlSessionFactory.openSession();
        
        try {
            EmployeeMapper mapper = openSession.getMapper(EmployeeMapper.);
            List<Employee> emps = mapper.getAllEmp();
            for(Employee emp:emps) {
                System.out.println(emp);
            }

        } finally {
            // TODO: handle finally clause
            openSession.close();
        }
    }
    
}

输出：

DEBUG 01-23 14:29:17,295 ==>  Preparing: select * from tbl_employee   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:29:17,334 ==> Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:29:17,412 ==      Total: 7  (BaseJdbcLogger.java:145) 
Employee [id=1,lastName=dema,1)">genderemail=dema@qq.com,1)">dept=null]
Employee [id=2,1)">=jack,1)">=675544321@qq.com,1)">=3,1)">=小红,1)">=0,1)">=xiaohong@qq.com,1)">=4,1)">=小明,1)">=xiaoming@qq.com,1)">=6,1)">=timo,1)">=timo@qq.com,1)">=7,1)">=manwang,1)">=manwang@qq.com,1)">=8,1)">=null]

我们共有7条数据。

第一种分页方式：

);
            第一个参数为当前页码，第二个参数是每页的记录数
            Page<Object> page = pageHelper.startPage(1,5);
            List<Employee> emps =(Employee emp:emps) {
                System.out.println(emp);
            }
            System.out.println("当前页码："+page.getPageNum());
            System.out.println("总记录数："+page.getTotal());
            System.out.println("每页几条记录："+page.getPageSize());
            System.out.println("总页码数："+page.getPages());
        }             openSession.close();
        }
    }
}

输出：

DEBUG 01-23 14:32:50,024 Cache Hit Ratio [sql_CACHE]: 0.0  (LoggingCache.java:62) 
DEBUG 01-23 14:32:50,071 ==>  Preparing: SELECT count(0) FROM tbl_employee   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:32:50,128 ==> Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:32:50,197 1  (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:32:50,199 ==>  Preparing: select * from tbl_employee LIMIT 5   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:32:50,1)">==> Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:32:50,212 <==      Total: 5  (BaseJdbcLogger.java:145) 
Employee [id当前页码：1
总记录数：7
每页几条记录：5
总页码数：2

第二种分页方式：

在上一种设置起始页和每页记录的情况下继续增加：

第一个参数为当前页码，第二个参数是每页的记录数
            Page<Object> page = pageHelper.startPage(1,2第一个参数为传入的数据，第二个参数为连续显示多少页
            PageInfo<Employee> pageInfo = new PageInfo<>(emps,3(Employee emp:emps) {
                System.out.println(emp);
            }
            System.out.println("当前页码："+pageInfo.getPageNum());
            System.out.println("总记录数："+pageInfo.getTotal());
            System.out.println("每页几条记录："+pageInfo.getPageSize());
            System.out.println("总页码数："+pageInfo.getPages());
            System.out.println("是否第一页："+pageInfo.isIsFirstPage());
            System.out.println("是否最后一页："+pageInfo.isIsLastPage());
            System.out.println("连续显示的页码："int[] navigatepageNums = pageInfo.getNavigatepageNums();
            for (int i = 0; i < navigatepageNums.length; i++) {
                System.out.println(navigatepageNums[i]);
            }
        } DEBUG 01-23 14:39:20,125 Cache Hit Ratio [sql_CACHE]: 0.0  (LoggingCache.java:62) 
DEBUG 01-23 14:39:20,172 ==>  Preparing: SELECT count(0) FROM tbl_employee   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:39:20,247 ==> Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:39:20,278 1  (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:39:20,281 Preparing: select * from tbl_employee LIMIT 2   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:39:20,283 Parameters:   (BaseJdbcLogger.java:145) 
DEBUG 01-23 14:39:20,292 <Total: 2  (BaseJdbcLogger.java:145) 
Employee [id当前页码：1
总记录数：7
每页几条记录：2
总页码数：4
是否第一页：true
是否最后一页：false
连续显示的页码：
1
2
3

mybatis扩展之使用PageHelper插件进行分页（是真好用）

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