Propagation_required -- supports the current transaction. If no transaction exists, a new transaction is created. This is the most common choice.
Propagation_supports -- supports the current transaction. If no transaction exists, it is executed in non-transaction mode.
Propagation_mandatory -- supports the current transaction. If no transaction exists, an exception is thrown.
Propagation_requires_new -- creates a transaction. If a transaction exists, it is suspended.
Propagation_not_supported -- executes operations in non-transaction mode. If a transaction exists, the current transaction is suspended.
Propagation_never -- runs in non-transaction mode. If a transaction exists, an exception is thrown.
Propagation_nested -- if a transaction exists, it is executed within the nested transaction. If no transaction exists, perform a similar operation as propagation_required.
Appendix:
In jquery, The jquery object obtains an attribute of an element:
$ (OBJ). ATTR ("XXX ")
Get DOM object $ (OBJ). OBJ () from jquery object ()
This is generally a DOM object. If you want a jquery object, $ (this)
