Spring supports java face questions of common transaction propagation properties and transaction propagation level

Property transactions

    1 propagation is used to set the transaction propagation behavior

                     The propagation of transaction: One way to run a method to open the transaction, the current approach is to use the attachment method affairs or the use of its own affairs

             Propagation.REQUIRED default value other people's affairs method of attachment

             Propagation.REQUIRES_NEW the original transaction hangs open a new transaction (that is, the implementation of its own affairs)

Use on the method requires the use of a transaction annotated @Transactional nothing Jia Mo think Propagation.REQUIRED

To open a new transaction to perform their own affairs in the way you can add @Transactional (propagation = Propagation.REQUIRES_NEW)

 

2 isolation is used to set the transaction isolation level

     Oracle supports transaction isolation level    (Read Committed read committed by default    serialized serializable 

•    Mysql support all transaction isolation level read uncommitted read uncommitted    
•                                                      Read Committed read commited
•                                                      (Default) repeatable read repeatable read
•                                                      Serialized serializable            

 With the spread of behavior is the same as in the notes @Transaction () add (isolation = Isolation.DEFAULT) 

Example: buy books Mysql database default before the repeatable read transaction isolation level the database when the price of the book becomes isolated on the price still fluctuates