Mybatis的分页插件Pagehelper的基本使用

第一步导包

  
            junit
            junit
            4.11
            test
        


        
        
            org.mybatis
            mybatis
            3.4.6
        
        
        
            mysql
            mysql-connector-java
            5.1.47
        
        
        
            log4j
            log4j
            1.2.17
        

        
            org.mybatis.generator
            mybatis-generator-core
            1.3.5
        
        
        
            com.github.pagehelper
            pagehelper
            5.1.8
        

        
            com.alibaba
            fastjson
            1.2.47
        

第二步,配置配置文件

db.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8
user=root
upwd=root

Mybatis的配置文件

实体类

package com.hw.entity;

import java.io.Serializable;

/**
 * @program: Maven
 * @description:
 * @author: hw
 * @create: 2019-01-01 00:42
 **/
public class Student implements Serializable {
    private Integer sid;
    private String sname;
    private Integer tid;




    public Student() {
        super();
    }

    public Student(String sname, Integer tid) {
        this.sname = sname;
        this.tid = tid;
    }

    public Student(Integer sid, String sname, Integer tid) {
        this.sid = sid;
        this.sname = sname;
        this.tid = tid;
    }

    @Override
    public String toString() {
        return "Student{" +
                "sid=" + sid +
                ", sname='" + sname + '\'' +
                ", tid=" + tid +
                '}';
    }

    public Integer getSid() {
        return sid;
    }

    public void setSid(Integer sid) {
        this.sid = sid;
    }

    public String getSname() {
        return sname;
    }

    public void setSname(String sname) {
        this.sname = sname;
    }

    public Integer getTid() {
        return tid;
    }

    public void setTid(Integer tid) {
        this.tid = tid;
    }
}

Mapper接口

package com.hw.mapper;

import com.hw.entity.Student;

import org.apache.ibatis.annotations.Select;

import java.util.List;
import java.util.Map;

/**
 * @program: Maven
 * @description:
 * @author: hw
 * @create: 2019-01-01 02:45
 **/
public interface StudentMapper {

    @Select("select * from student where sname like '%${sname}%' and tid=#{tid}")
    public List findStudentByMap(Map map);

}

测试类

package com.hw.test;

import com.alibaba.fastjson.JSON;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.hw.entity.Student;
import com.hw.mapper.StudentMapper;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

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

/**
 * @program: Maven
 * @description:
 * @author: hw
 * @create: 2019-01-03 09:14
 **/
public class demo1 {
    SqlSession sqlSession;
    SqlSessionFactory build;

    @Before
    public void before() {
        try {
            //读取配置文件
            InputStream inputStream = Resources.getResourceAsStream("Mybatis.xml");
            //通过sqlsessionFactoryBuilder创建sqlsessionFactory会话工厂
            build = new SqlSessionFactoryBuilder().build(inputStream);
            //通过sqlsessionFactory创建sqlsession
            sqlSession = build.openSession();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @After
    public void after() {
        //关闭sqlsession
        sqlSession.commit();
        sqlSession.close();
    }

    @Test
    public void test1() throws IOException, InterruptedException {
        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);
        //查询返回值为 lsit