MyBatis入门案例——idea

1、创建maven工程

 2、配置pom.xml文件，配置完记得刷新maven工程

 

        
            mysql
            mysql-connector-java
            8.0.11
        

        
            org.mybatis
            mybatis
            3.5.2
        

        
            junit
            junit
            4.12
        

 
        14
        14
    

    
        
            
                src/main/resources
                
                    **/*.properties
                    **/*.xml
                
                false
            
            
                src/main/java
                
                    **/*.properties
                    **/*.xml
                
                false
            
        
    
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3、在resoources下创建mybatis-config.xml文件并配置

    
        
            

            
                
                
                
                
            
        
    

    

        
    

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4、写工具类MyBatisUntil，在java下创建一个until包，包里创建MyBatisUntil类

package until;

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 java.io.IOException;
import java.io.InputStream;

//工具类
public class MyBatisUntil {
    private static SqlSessionFactory sqlSessionFactory;
    static {
        try {
            //获取sqlSessionFactory对象
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        } catch (IOException ioException) {
            ioException.printStackTrace();
        }
    }

    //创建sqlSession对象
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }

}
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5、开始测试实例，创建mybatis数据库，值该数据库创建user表 6、java下创建pojo包，pojo下创建User类

package pojo;

public class User {
    private int id;
    private String name;
    private String pwd;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + ''' +
                ", pwd='" + pwd + ''' +
                '}';
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    public User() {
    }

    public User(int id, String name, String pwd) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
    }
}
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7、创建dao包，创建接口UserDao

package dao;

import pojo.User;

import java.util.List;

public interface UserDao {
    List getUserList();
}
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8、在dao下创建UserDao接口对应xml配置文件 UserMapper.xml

    
        select * from mybatis.user
    


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注意UserMapper.xml需要到MyBatis-config.xml进行注册

 9、测试实例，在test下到java下创建dao包，包下创建UserDaoTest类

package dao;

import org.apache.ibatis.session.SqlSession;
import org.junit.Test;
import pojo.User;
import until.MyBatisUntil;

import java.util.List;

public class UserDaoTest {
    @Test
    public void test1(){
        //获取sqlSession对象
        SqlSession sqlSession = MyBatisUntil.getSqlSession();
        //执行
        UserDao mapper = sqlSession.getMapper(UserDao.class);
        //循环打印查找数据
        List userList = mapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }

        //关闭
        sqlSession.close();
    }

}
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测试成功