JdbcTransaction 源码

public class JdbcTransaction implements Transaction {
    private static final Log log = LogFactory.getLog(JdbcTransaction.class);
    protected Connection connection;
    protected DataSource dataSource;
    protected TransactionIsolationLevel level;
    protected boolean autoCommit;
 
    public JdbcTransaction(DataSource ds, TransactionIsolationLevel desiredLevel, boolean desiredAutoCommit) {
      	//数据源
        this.dataSource = ds;
      	//事务隔离级别，上面已经提到过了
        this.level = desiredLevel;
      	//是否自动提交
        this.autoCommit = desiredAutoCommit;
    }
  	
  //也可以直接给个Connection对象
   public JdbcTransaction(Connection connection) {
        this.connection = connection;
    }
 
    public Connection getConnection() throws SQLException {
      	//没有就通过数据源新开一个Connection
        if (this.connection == null) {
            this.openConnection();
        }
	
        return this.connection;
    }
 
    public void commit() throws SQLException {
      	//连接已经创建并且没开启自动提交才可以使用
        if (this.connection != null && !this.connection.getAutoCommit()) {
            if (log.isDebugEnabled()) {
                log.debug("Committing JDBC Connection [" + this.connection + "]");
            }
						//实际上使用的是数据库驱动提供的Connection对象进行事务操作
            this.connection.commit();
        }
    }
  	...