Search Results

Search found 47200 results on 1888 pages for 'null object pattern'.

Page 99/1888 | < Previous Page | 95 96 97 98 99 100 101 102 103 104 105 106  | Next Page >

• Diffence between "select count(null)" and "select count(1)"

  - by Midhat

  In MySQL Select 1 from mytable and select null from mytable both return the same number of rows. While select count(1) from mytable returns the rowcount and select count(null) from mytable always returns 0. Why?

  Read the article

• NullDisplayText in markup or ISNULL(field, 0) in SQL?

  - by abatishchev

  Which approach is better to use: BoundField.NullDisplayText isn't set. NULL-case is foreseen in SQL query, i.e. SELECT ISNULL(amount, 0) FROM table or BoundField.NullDisplayText is set, e.g. "0.00 %". NULL-case isn't foreseen in SQL query, i.e. SELECT amount FROM table What do you think?

  Read the article

• Cross platform /dev/null in Python

  - by Tristan

  I'm using the following code to hide stderr on Linux/OSX for a Python library I do not control that writes to stderr by default: f = open("/dev/null","w") zookeeper.set_log_stream(f) Is there an easy cross platform alternative to /dev/null? Ideally it would not consume memory since this is a long running process.

  Read the article

• Java's getResourceAsStream() is always returning null

  - by Andreas Grech

  I have the following structure in a Java Web Application: TheProject -- [Web Pages] -- -- [WEB-INF] -- -- -- abc.txt -- -- index.jsp -- [Source Packages] -- -- [wservices] -- -- -- WS.java In WS.java, I am using the following code in a Web Method: InputStream fstream = this.getClass().getResourceAsStream("abc.txt"); But it is always returning a null. I need to read from that file, and I read that if you put the files in WEB-INF, you can access them with getResourceAsStream, yet the method is always returning a null. Any ideas of what I may be doing wrong?

  Read the article

• DB.Null equivalent in JDBC

  - by Fakrudeen

  Is there an equivalent of (ADO.NET) DB.Null in JDBC? Or do I simply pass null in the parameter? Particularly in the context of Mysql?

  Read the article

• how to save related models with non-null foreign key

  - by Fortress

  I have a model called user which has_one email. I put the foreign key (NOT NULL) inside users table. Now I'm trying to save it in the following way: @email = Email.new(params[:email]) @email.user = User.new(params[:user]) @email.save This raises a db exception, because the foreign key constraint is not met (NULL is inserted into email_id). How can I elegantly solve this or is my data modeling wrong?

  Read the article

• Can a well-formed HTTP Request contain "NULL"?

  - by StackedCrooked

  My OCSP client is sending me the following HTTP request: POST <NULL> HTTP/1.0 Content-Type: application/ocsp-request Content-Length: 120 The NULL is not mentioned in the RFC for HTTP 1.0. Does that make this a malformed request?

  Read the article

• Help me understand javascript:void(null)

  - by Anil Namde

  can someone please help me with this javascript:void(null) I found it used in link buttons as follows <a onclick="ProcessResponse()" href="javascript:void(null)" >Accept Data</a>

  Read the article

• Inserting a null value into the database.

  - by J Harley

  Good Morning, Say I have an insert statement: Insert INTO tblTest (fieldOne,FieldTwo,fieldThree) VALUES ('valueOne','valueTwo','null') This statement doesn't seem to want to insert a null value into the database... I have also tried to insert the word "nothing". Has anyone any ideas how to make this work? I am using SQL server 2005.

  Read the article

• Sum and average over null values SQL Server 2008 Analysis Services

  - by Jonathan

  I have a simple problem, I think, but I have googled and can't find the solution. I have a cube that has MeasureA, MeasureB and MeasureC. Not all three measures have values for each record, sometimes they can be null, it's depending if it was applicable. Now for my totals, I need to average but the average must not take nulls into account. Any help will be much appreciated. When I view the measures, the null values show as zeros.

  Read the article

• How not to display columns which are NULL in a view

  - by Michelle

  I've set up a view which combines all the data across several tables. Is there a way to write this so that only columns which contain non-null data are displayed, and those columns which contain all NULL values are not included?

  Read the article

• Set MdiParent to null (Nothing) in FormClosed

  - by serhio

  In my project I observed that in a FormClosed method (that handles FormClosed event) is set MdiParent = Nothing (null). This code makes (? no idea why) that OnLoad(method) on some child panels is raised. Is there any sense to set MdiParent to null (Nothing) in FormClosed?

  Read the article

• Groovy rootLoader is null

  - by Geo

  When running a groovy script from Eclipse, the following line: def rootLoader = this.class.getClassLoader().getRootLoader() is null. When I run the script directly from command line, this is not null. How can I find out why this happens?

  Read the article

• Replacing special characters by null

  - by madheena

  Hi, Is there any function to replace the special characters by null in informatica if we used replacestr function, i think we should specify all special characters as follows replacestr(input,'!','~','@','#','$','%','^','&','*',null) But we dont know what are teh special characters will be coming as input. can u please let me know that which function will be suitable.

  Read the article

• returning null array in getting photos albums

  - by bhaskaragr29

  <?php $albums=$facebook->api_client->photos_getAlbums($user_id, NULL); ?> I am getting null when run this code

  Read the article

• Array returning Null values

  - by Nick Gibson

  Dunno why it is...heres the coding for it. http://pastebin.org/301343 I know theres a lot of repetitiveness in the coding...but its because the arrays were retuning null so I got tired of messing with them. Everything works until it reaches line 224, which returns null values.

  Read the article

• Java: Making reference null after closing stream

  - by Hei

  Is it a good practice to set stream references to null after closing them? Would this release resources in any way? Example: BufferedReader input= new BufferedReader(new FileReader("myfile.txt")); // code input.close(); input = null; // possible more code

  Read the article

• Evaluate empty or null JSLT c tags

  - by user338381

  How can I validate a String null or empty using the c tags of JSLT. I have a variable of name var1 and I can display it, but I want to add a comparator for validate it. I want to validate when is different of null or empty (my values are string).

  Read the article

• Difference between name != null and null != name in java?

  - by GK

  I have seen people using the following conditions interchangeably. String name; //some code if(name != null) //or if(null != name) So is there any difference in this? or both are same? I am asking this here because, i heard that there is some difference in these, but don't know what. Thanks

  Read the article

• NullDisplayText in markup vs ISNULL(field, 0) in SQL?

  - by abatishchev

  Which approach is better to use: BoundField.NullDisplayText isn't set. NULL-case is foreseen in SQL query, i.e. SELECT ISNULL(amount, 0) FROM table or BoundField.NullDisplayText is set, e.g. "0.00 %". NULL-case isn't foreseen in SQL query, i.e. SELECT amount FROM table What do you think?

  Read the article

• "=null" and select statement!

  - by user329820

  Hi I have asked this question before in this forum and they told me that it will retun an empty result set,I want to know that if I set the column with null values it will retun an empty result set?also the ANSI_NULLS is OFF ,thanks SELECT 'A' FROM T WHERE A = NULL;

  Read the article

• p=malloc()!=null.......

  - by gcc

  char *p,*p1,*p2,*p3,*p4; for(;;) { if((p=malloc(10))!=NULL && (p1=malloc(20))!=NULL ......) break; } Writing if(........) is too boring and long, are there any ways to make it simpler?

  Read the article

• delete vs NULL vs free in c++

  - by hero

  what is the difference between deleting a pointer and setting it to null and freeing it. delete ptr; ptr=NULL; free(ptr);

  Read the article

• delete vs NULL in c++

  - by hero

  what is the difference between deleting a pointer and setting it to null. delete ptr; ptr=NULL;

  Read the article

• Core Data managed object context thread synchronisation

  - by Ben Reeves

  I'm have an issue where i'm updating a many-to-many relationship in a background thread, which works fine in that threa, but when I send the object back to the main thread the changes do not show. If I close the app and reopen the data is saved fine and the changes show on the main thread. Also using [context lock] instead of a different managed object context works fine. I have tried NSManagedObjectContext: - (BOOL)save:(NSError **)error; - (void)refreshObject:(NSManagedObject *)object mergeChanges:(BOOL)flag; at different stages throughout the process but it doesn't seem to help. My core data code uses the following getter to ensure any operations are thread safe: - (NSManagedObjectContext *) managedObjectContext { NSThread * thisThread = [NSThread currentThread]; if (thisThread == [NSThread mainThread]) { //Main thread just return default context return managedObjectContext; } else { //Thread safe trickery NSManagedObjectContext * threadManagedObjectContext = [[thisThread threadDictionary] objectForKey:CONTEXT_KEY]; if (threadManagedObjectContext == nil) { threadManagedObjectContext = [[[NSManagedObjectContext alloc] init] autorelease]; [threadManagedObjectContext setPersistentStoreCoordinator: [self persistentStoreCoordinator]]; [[thisThread threadDictionary] setObject:threadManagedObjectContext forKey:CONTEXT_KEY]; } return threadManagedObjectContext; } } and when I pass object between threads i'm using -(NSManagedObject*)makeSafe:(NSManagedObject*)object { if ([object managedObjectContext] != [self managedObjectContext]) { NSError * error = nil; object = [[self managedObjectContext] existingObjectWithID:[object objectID] error:&error]; if (error) { NSLog(@"Error makeSafe: %@", error); } } return object; } Any help appreciated

  Read the article

< Previous Page | 95 96 97 98 99 100 101 102 103 104 105 106  | Next Page >