Introduction to declarative transaction management transaction attributes (applicable to COM +/ejb cmt)

I recently read mastering EJB ( 3rd , we can see the CMT section, which introduces the transaction attributes of declarative transaction management. I feel that it is really easy to understand and can be excerpted as follows:

Common EJB CMT6Type attribute:Required, requiresnew, supports, mandatory, notsupported, never.
COM +Remember that5Type:MandatoryOther than that5.

The control granularity of these attributes can reach the method level, meaning as follows:
[1] required:
Must run in transactions. If a transaction is already running, it is involved; otherwise, a new transaction is created.
[2] requiresnes:
Always start new transactions.
[3] supports:
The transaction that follows the client. If a transaction is running, it is involved; otherwise, it is not required to run in the transaction.
[4] mandatory:
The client must start the transaction; otherwise, an exception is thrown to the client. (This propertyCOM +Not in)
[5] notsupported:
Will not participate in the transaction, regardless of whether the client starts the transaction.
[6] Never:
Cannot participate in the transaction. If the client has started the transaction, an exception is thrown to the client.

Finally, an example table is provided to express the above concepts easily:

Transaction attributes	Client transactions		Transactions of components marking Properties
Required	None	T1	T2	T1
Requiresnew	None	T1	T2	T2
Supports	None	T1	None	T1
Mandatory	None	T1	Exception	T1
Notsupported	None	T1	None	None
Never	None	T1	None	Exception

 

For more information about transaction isolation, see what I wrote.Article:

Http://interma.cnblogs.com/archive/2005/12/25/304472.html

Finally, it's irrelevant, even though everyone is shoutingWithout EJB,WithoutejbHoweverEJBAt least I feelEJB(Goal) is really beautiful.