Conversion: type of transaction propagation in spring transactiondefinition

1. propagation_required

If no transaction exists, create a transaction. If a transaction already exists, add it to the transaction. This is the most common choice.

2. propagation_supports

Supports the current transaction. If no transaction exists, it is executed in non-transaction mode.

3. propagation_mandatory

Use the current transaction. If no transaction exists, an exception is thrown.

4. propagation_requires_new

Create a new transaction. If a transaction exists, the current transaction is suspended.

5. propagation_not_supported

The operation is performed in non-transaction mode. If a transaction exists, the current transaction is suspended.

6. propagation_never

It is executed in non-transaction mode. If a transaction exists, an exception is thrown.

7. propagation_nested

If a transaction exists, it is executed in the nested transaction. If no transaction exists, perform a similar operation as propagation_required.