Transaction Definition

Transaction Definition

1. PROPAGATION_REQUIRED (normally used)
   If transaction existed, use it, otherwise open a new transaction
2. PROPAGATION_SUPPORTS
   If transaction existed, use it, otherwise run as non-transaction
3. PROPAGATION_MANDATORY
   If transaction existed, use it, otherwise throw Exception
4. PROPAGATION_REQUIRES_NEW
   Always open a new transaction, if transaction existed, hang up the existed transaction
5. PROPAGATION_NOT_SUPPORTED
   Always run without transaction, if transaction existed, hang up the existed transaction
6. PROPAGATION_NEVER
   Always run without transaction, if transaction existed, throw Exception
7. PROPAGATION_NESTED (in Spring)
   If transaction existed, run nested transaction inside the existed transaction.
   If no transaction existed, run as PROPAGATION_REQUIRED

Propagation	T1 None	T1 Existed
REQUIRED	T2=>new	T1
SUPPORTS	T2 None	T1
MANDATORY	T2 Exception	T1
REQUIRES_NEW	T2=>new	T2=>new
NOT_SUPPORTED	None	Hang up T1
NEVER	None	T2 Exception
NESTED	As REQUIRED	Nested