I use the following code to update an object from servlet in Google
App Engine :
String Time_Stamp="[ 2010-05-26 ]",query="select from
"+Contact_Info_Entry.class.getName()+" where Contact_Id ==
'"+Contact_Id+"' order by Contact_Id desc";
PersistenceManager pm=null;
try
{
pm=PMF.get().getPersistenceManager();
// note that this returns a list, there could be multiple,
DataStore does not ensure uniqueness for non-primary key fields
List<Contact_Info_Entry>
results=(List<Contact_Info_Entry>)pm.newQuery(query).execute();
Contact_Info_Entry A_Contact_Entry=results.get(0);
A_Contact_Entry.Extra_10=Time_Stamp;
pm.makePersistent(A_Contact_Entry);
}
catch (Exception e)
{ Send_Email(Email_From,Email_To,"Check_License_Servlet Error
[ "+Time_Stamp+" ]",new Text(e.toString()
+"\n"+Get_Stack_Trace(e)),null); }
finally { pm.close(); }
The value "[ 2010-05-26 ]" was in A_Contact_Entry.Extra_10, but it
seems "pm.makePersistent(A_Contact_Entry);" was not executed.
The object was not updated and there was no error message, why ? How
to fix it ?
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