Public void makepersistent (java.lang.Object PC)
Parameters:
PC - a TRANSIENT INSTANCE OF A
Class That Implements
PersistenceCapable
This is a segment definition of MakePersistent in JDO-Javadoc, and a PC is an instanto instance object.
In fact, a Persistent New instance can also make MakePersistent, and a personistent dirty instance is not
Test code:
1. Persistent Persistent New object
PersistenceManager pm = PersistenceManagerSource.distinctPM (); Transaction t = pm.currentTransaction (); t.begin (); userDAO.setPoClass (User.class); try {user = (User) userDAO.getObjectById (pm, id); / / Get the Persistent New User Object Pm.makePersistent (user) from DAO; // Persistence operation, this operation is not wrong
PM.makeTransient (user);
} catch (daoException e) {if (t.isactive ()) T. Rollback (); // Todo auto-generated catch block E.PrintStackTrace ();} finally {ix (t.isactive ()) T.Commit ); If (pm! = Null) pm.close ();} return user;
2. Persistence Persistent Dirty object
PersistenceManager pm = PersistenceManagerSource.distinctPM (); Transaction t = pm.currentTransaction (); t.begin (); userDAO.setPoClass (User.class); try {user = (User) userDAO.getObjectById (pm, id); / / Get the Persistent New User object from Dao
User.setUsername ("jjyao"); pm.makepersistent (user); // persistent operation, this operation error
PM.makeTransient (user);
} catch (daoException e) {if (t.isactive ()) T. Rollback (); // Todo auto-generated catch block E.PrintStackTrace ();} finally {ix (t.isactive ()) T.Commit ); If (pm! = Null) pm.close ();} return user;
