Jfinal things rollback, @Before (Tx.class) and Db.tx (new Iatom () {})

First, note @Before (tx.class) Add things rollback

@Before (tx.class) public
	void Pay () throws Exception {
		//throws Exception;
	}

The method body cannot catch exceptions, all exceptions are thrown, and things will roll back when an exception occurs

Advantages: Simple violence, do not need to deal with each exception, directly thrown can be;

Disadvantage: Can not be detailed to distinguish the return data, views, can only be generalized to report exceptions

Second, Db.tx (new Iatom () {})

public void Pay () {
		final map<string,string> Map = new hashmap<string, string> ();
		Boolean bl = Db.tx (new Iatom () {
			@Override public
			Boolean run () throws SQLException {
				
				if (...) {
					//...
					return false;
				} else {
					...
					return true;
				}
				
				return true;
			}
		});
		
		This.rendjson (BL, Null,map.get ("Return_words"), null);
	}

return False or an exception thrown will rollback the transaction, return True to commit the transaction, the Db.tx method is a return value True/false, can be changed to return the value of the business return, if you want the run method to pass the variable to the outer layer, you can define a final Modified container class object or definition map, two more comprehensive, processing more delicate, recommended to use two.