创建Mybatis实例

1、在数据库中创建User表

2、创建Maven项目

3、导入依赖

    
        
            org.mybatis
            mybatis
            3.5.7
        
        
            mysql
            mysql-connector-java
            5.1.47
        
        
            com.alibaba
            druid
            1.2.6
        
        
            org.projectlombok
            lombok
            1.18.6
        
    
    
        
            
                src/main/java
                
                    **
    public static SqlSession openSqlSession() throws IOException {
        return sqlSessionFactory.openSession();
    }

    
    public static void commitAndClose(SqlSession sqlSession) {
        if (sqlSession != null) {
            sqlSession.commit();
            sqlSession.close();
        }
    }

    
    public static void rollbackAndClose(SqlSession sqlSession) {
        if (sqlSession != null) {
            sqlSession.rollback();
            sqlSession.close();
        }
    }
}

6、创建UserMapper接口

public interface UserMapper {

    List findAll();
}

7、创建UserMapper.xml

    
        select * from user
    

8、进行测试

    public static void main(String[] args) {
        SqlSession session = MybatisUtils.getSession();
        UserMapper mapper = session.getMapper(UserMapper.class);
        List all = mapper.findAll();
        for (User user : all) {
            System.out.println(user);
        }
    }