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Re: Delete statement
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Re: Delete statement


  • Subject: Re: Delete statement
  • From: Frank Stock <email@hidden>
  • Date: Wed, 4 Apr 2007 23:19:10 +0200

I did try this with the locking. But perhaps I am doing something wrong, but it doesn't seem to do anything.
My SQL-staments are just like before. Shouldn't I see a 'select for update'?


Op 4-apr-07, om 21:10 heeft email@hidden het volgende geschreven:

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Today's Topics:

   1. Re: Delete statement (Ken Anderson)
   2. Re: Delete statement (Chuck Hill)


----------------------------------------------------------------------

Message: 1
Date: Wed, 4 Apr 2007 12:56:42 -0400
From: Ken Anderson <email@hidden>
Subject: Re: Delete statement
To: Frank Stock <email@hidden>
Cc: email@hidden
Message-ID: <email@hidden>
Content-Type: text/plain; charset="us-ascii"

Frank,

Upon first glance, your code looks OK, except for the fact that
you're not locking your editing context.  Since you're allocating a
new one, you need to lock it.  I suggest you do this:

ec.lock();
try {
// current code
} finally {
ec.unlock();
}

Since your problem is intermittent, it is likely that this is the
problem.

Ken


On Apr 4, 2007, at 12:45 PM, Frank Stock wrote:

Hi,

I use SOAP-calls to WO and I get strange effects in the following
routine:

public void deleteWebtextValue (String webtext, String language) {

		EOEditingContext ec = new EOEditingContext();
		EOQualifier aQual;
		NSMutableArray qbind;
		EOFetchSpecification fs;

		LanguageWebtext lwObject;
		qbind=new NSMutableArray();
		qbind.addObject(webtext);
		qbind.addObject(language);
		aQual = EOQualifier.qualifierWithQualifierFormat
("(webtext.webtext=%@) and (language.language=%@)",qbind);
		fs = new EOFetchSpecification("LanguageWebtext",aQual,null);
		NSArray arLanguageWebtext = ec.objectsWithFetchSpecification(fs);
		// should only be 1
		for (int i=0;i< arLanguageWebtext.count();i++) {
			lwObject = (LanguageWebtext)arLanguageWebtext.objectAtIndex(i);
			ec.deleteObject(lwObject);
		}
		ec.saveChanges();

	}

Most of the time this results in a delete-statement:
delete from languagewebtext where languagewebtext_id=8788;

but sometimes I get a (strange) update-statement:

update languagewebtext set language_id = NULL, webtext_id = NULL
where languagewebtext_id=8898;
Both can't be NULL;
This results in currupting the database!

I don't understand that!


Thanks for helping, Frank Stock _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: 40anderhome.com

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------------------------------

Message: 2
Date: Wed, 4 Apr 2007 10:09:29 -0700
From: Chuck Hill <email@hidden>
Subject: Re: Delete statement
To: WebObjects Dev Apple <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

I can almost guarantee this is the problem.  :-)

Chuck


On Apr 4, 2007, at 9:56 AM, Ken Anderson wrote:

Frank,

Upon first glance, your code looks OK, except for the fact that
you're not locking your editing context.  Since you're allocating a
new one, you need to lock it.  I suggest you do this:

ec.lock();
try {
// current code
} finally {
ec.unlock();
}

Since your problem is intermittent, it is likely that this is the
problem.

Ken


On Apr 4, 2007, at 12:45 PM, Frank Stock wrote:

Hi,

I use SOAP-calls to WO and I get strange effects in the following
routine:

public void deleteWebtextValue (String webtext, String language) {

		EOEditingContext ec = new EOEditingContext();
		EOQualifier aQual;
		NSMutableArray qbind;
		EOFetchSpecification fs;

		LanguageWebtext lwObject;
		qbind=new NSMutableArray();
		qbind.addObject(webtext);
		qbind.addObject(language);
		aQual = EOQualifier.qualifierWithQualifierFormat
("(webtext.webtext=%@) and (language.language=%@)",qbind);
		fs = new EOFetchSpecification("LanguageWebtext",aQual,null);
		NSArray arLanguageWebtext = ec.objectsWithFetchSpecification(fs);
		// should only be 1
		for (int i=0;i< arLanguageWebtext.count();i++) {
			lwObject = (LanguageWebtext)arLanguageWebtext.objectAtIndex(i);
			ec.deleteObject(lwObject);
		}
		ec.saveChanges();

	}

Most of the time this results in a delete-statement:
delete from languagewebtext where languagewebtext_id=8788;

but sometimes I get a (strange) update-statement:

update languagewebtext set language_id = NULL, webtext_id = NULL
where languagewebtext_id=8898;
Both can't be NULL;
This results in currupting the database!

I don't understand that!


Thanks for helping, Frank Stock _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: 40anderhome.com

This email sent to email@hidden

_______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: 40global-village.net

This email sent to email@hidden

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