MyBatis: Java代码创建MyBatis配置

package controller;

import org.apache.ibatis.datasource.pooled.PooledDataSource;
import org.apache.ibatis.mapping.Environment;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.apache.ibatis.transaction.TransactionFactory;
import org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory;

import mapper.UserMapper;

public class TestBasic2 {
  public static void main(String[] args) {
    PooledDataSource dataSource = new PooledDataSource();
    dataSource.setDriver("com.mysql.jdbc.Driver");
    dataSource.setUsername("root");
    dataSource.setPassword("root");
    dataSource.setUrl("jdbc:mysql://localhost:3306/springboot2");
    dataSource.setDefaultAutoCommit(false);
    
    TransactionFactory transactionFactory = new JdbcTransactionFactory();
    Environment environment = new Environment("development", transactionFactory, dataSource);
    
    Configuration configuration = new Configuration(environment);
    
    
    configuration.addMapper(UserMapper.class);
    
    
    SqlSessionFactory sqlSessionFactory = 
        new SqlSessionFactoryBuilder().build(configuration);
    
    SqlSession session=sqlSessionFactory.openSession();
    int tmp=session.selectOne("mapper.UserMapper.getCount");
    System.out.println(tmp);
    
  }
  

}