NHibernate performing a delete with Cascade.All causes N+1 deletes -

-

I have two entities, passwords and passwords in password is a collection of passwords in the password (which are hash with different masks).

When I delete a password, I want to remove all the related password hashes too.

I like this mapping: 

  mapping Hasman (x = & gt; x.PasswordHashes) .cascade. All (). Current () .powered by (x => x.password);   
 I was expecting two questions to be generated:  
  Remove from "passwordHash" where "idpassword" =: p0   
 And obviously remove  
  from "password" "idpassword" =: p0   
 Instead, NHibernate has prepared N + 1 queries in this way Delete: Remove the password from "Password hash": "id password ish" =: p0 (n)   
 and  
  "password"   
 How can I make this behavior more optimal?  
 Edit: Code which deletes:  
  session.Delete (password); Session.Flush (); In the current release of NHibernate (3.3), from my research, it seems that    
 
 
 It is not possible to delete a child collection with a single  DELETE  statement using functions such as  password.hashes.Clear ()  or  session.Delete (password)  The NHibernate documentation is mentioned on your domain object, but I can do this work with any combination with any combination and for many organizations, unidirectional or bidirectional A Has been unable to find.  
 An option is to use the  on-deleit = "cascade"  which disables cascade functionality in NHibernate and to apply the cascade deletion to the database drop offs. Further information can be found by NH users in the Google Groups discussion.  
 The other option mentioned by Rippo in the comment section is to use HQL, you will need two statements, so it would be best to wrap them in the transaction, that is,  session.BeginTransaction () {session .query ("Delete password hash h from where h .password =: password") .set parameter ("password", password). Index (); Session Delete (password); Transactions. Dialog ();}

Comments

Post a Comment

Popular posts from this blog

excel vba - How to delete Solver(SOLVER.XLAM) code -

-
After opening several examples of macro / code written, I suddenly get stuck with a code that seems safe. Solver (SOLVER.XLAM) is doing this notation and I would like to remove it from my system. I do not think this is a relativant code. Can anyone tell me what should I do? I have already installed something to remove the password but Solver is still asking for password and I can not get rid of it! itemprop = "text"> Solver Excel is add-in If you want to delete it, then Excel Application & gt; Options & gt; Add-ins & gt; Search for 'Go to' button and gt; Uncheck the solver on the list like press something (I can not give you the exact path because I have the Polish version of Excel). Trying to open Solver's VBA code is not good because it There is allegedly copyright. Besides, I do not think Solver creates any disadvantages while working with Excel or VBA.
Read more

github - Teamcity & Git - PR merge builds - anyway to get HEAD commit hash? -

-
I have a team city build project with Gitbab VCS route, I have been triggered for both / head on PR and / Merge the referee. The annoying thing is that you can not do anything useful with the merged hash - it is not present in Gitobb. I want to exclude newsgate packages with head in gutub comet situations in the version number along with Hewash (Newsaging 7) for the music build, but against head hash. However, I can not see a way to get the head hashes while constructing that merge. I just want to head because it's useless - we only care about merge. (PR - Pull Request) This command works reliably while running One on / merge is git log --no-merge -1 ---- = '% h'
Read more

ios - Replace text in UITextView run slowly -

-
I have a UITextView and I change a word like the code at the end of UITextView.text: - (void) Replace TexttechWitWord: (NSString *) word {NSString * currentTextViewText = self.textView.text; CurrentTextViewText = [currentTextViewText stringByReplacingCharactersInRange: NSMakeRange ([self.textView.text length] - [word length], [word length]) withString: word; Self.textView.text = currentTextViewText; } Replacement work is fine, but it runs very slowly and very slowly when the textView now lengthens Is there any better way? I try the replacement range: with text for a week but still stuck. Not to know how to use it to replace it in your case. Please guide! Thanks in advance! This is an important job. As you are using an irreversible string and you are creating a very long string and before Assigned to NSString created from. NSString will be used instead of NSMutableString . - (UITableViewCell *) TableView: (UITableView *) Table View CellForOutPath: (NSIndex...
Read more