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Questions tagged null

189 questions · page 2 of 4

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63
votes
5
answers

How to check if String is null

c# null
asked 2011-09-26T10:11:31.773
14
votes
1
answers

ASP.NET + C# HttpContext.Current.Session is null (Inside WebService)

c# asp.net session null
asked 2011-09-25T13:13:51.967
73
votes
3
answers

Postgresql turn null into zero

sql postgresql null max
asked 2011-09-17T04:46:43.397
19
votes
4
answers

Is NULL defined as nullptr in C++11?

c++ null c++11 nullptr
asked 2011-08-26T06:13:51.363
16
votes
1
answers

Why do rapply and lapply handle NULL differently?

r null lapply
asked 2011-08-24T03:57:53.320
25
votes
1
answers

Undocumented String.compareTo(null) NPE?

java string null compareto
asked 2011-08-23T22:55:08.543
30
votes
3
answers

Need help selecting non-empty column values from MySQL

mysql sql null
asked 2011-08-04T19:11:42.003
10
votes
4
answers

JavaScript undefined replaced with null

javascript null undefined
asked 2011-07-26T17:30:34.857
20
votes
7
answers

fopen() returning a NULL pointer, but the file definitely exists

c visual-studio-2008 pointers null fopen
asked 2011-07-13T22:10:55.067
30
votes
5
answers

Rails where condition with nil value

ruby-on-rails null
asked 2011-07-13T12:18:57.440
37
votes
3
answers

Django: Want to display an empty field as blank rather displaying None

python django null
asked 2011-07-05T14:23:42.723
11
votes
1
answers

Test if a created object is nil

ios objective-c iphone testing null
asked 2011-07-04T14:58:39.883
11
votes
9
answers

Javascript document.getElementById("id").value returning null instead of empty string when the element is an empty text box

javascript string dom null
asked 2011-06-27T10:26:33.317
122
votes
6
answers

When is null or undefined used in JavaScript?

javascript null undefined
asked 2011-06-21T17:10:43.927
324
votes
22
answers

Checking if an object is null in C#

c# null nullreferenceexception
asked 2011-06-20T21:40:36.130
21
votes
6
answers

What should int compareTo() return when the parameter string is null?

java string null nullpointerexception compareto
asked 2011-06-06T23:56:45.197
16
votes
4
answers

Why is the view model null?

c# asp.net-mvc null
asked 2011-06-05T12:09:26.497
17
votes
2
answers

IDENTITY NOT NULL at Table Creation

sql null identity
asked 2011-06-01T11:36:18.650
11
votes
3
answers

Which Scala methods return null instead of an Option and why?

scala methods null standard-library scala-option
asked 2011-05-30T21:52:01.137
9
votes
5
answers

Are keySet entries of a WeakHashMap never null?

java null iteration weakhashmap keyset
asked 2011-05-28T00:45:18.563
91
votes
8
answers

Why can't I check if a 'DateTime' is 'Nothing'?

vb.net datetime null nullable
asked 2011-05-03T12:48:00.407
38
votes
3
answers

Why did father of Clojure say that Scheme's true/false are broken?

clojure null scheme common-lisp
asked 2011-04-29T09:53:09.937
28
votes
6
answers

node to traverse cannot be null (Hibernate SQL)

sql hibernate null
asked 2011-04-28T11:20:39.843
66
votes
4
answers

How to check for null in a single statement in scala?

scala null inline
asked 2011-04-21T07:26:56.900
18
votes
4
answers

Removing NOT NULL restriction from column in MySQL

mysql null alter
asked 2011-04-18T18:55:04.420
14
votes
2
answers

Why don't I get a NullPointerException in Groovy in this case?

groovy null
asked 2011-03-29T12:52:05.007
184
votes
5
answers

What's the better (cleaner) way to ignore output in PowerShell?

powershell null void io-redirection
asked 2011-03-10T13:15:51.633
165
votes
7
answers

How to do method overloading for null argument?

java oop null overloading
asked 2011-03-08T07:55:21.093
85
votes
2
answers

How to specify null value as filter in a Doctrine query?

php null doctrine dql
asked 2011-03-01T12:16:01.580
19
votes
7
answers

SQL UPDATE, but only if the old value is null

sql null sql-update
asked 2011-01-26T15:14:54.607
40
votes
10
answers

ToString on null string

c# string exception null tostring
asked 2011-01-25T12:39:22.477
20
votes
9
answers

How to check for NULL in MySqlDataReader by the column's name?

c# mysql null dbnull mysqldatareader
asked 2011-01-19T19:19:47.490
40
votes
11
answers

C# Nullable Equality Operations, Why does null <= null resolve as false?

c# .net null comparison-operators
asked 2011-01-19T00:43:00.367
1864
votes
26
answers

What is a NullReferenceException, and how do I fix it?

c# .net vb.net null nullreferenceexception
asked 2011-01-11T16:48:29.143
11
votes
2
answers

How do I replace all my NULL values in a particular field in a particular table?

mysql null replace phpmyadmin
asked 2011-01-07T19:00:17.013
114
votes
10
answers

MySQL and PHP - insert NULL rather than empty string

php mysql null sql-insert
asked 2011-01-06T22:00:41.613
34
votes
2
answers

Assigned vs <> nil

delphi pointers null
asked 2010-12-19T16:55:12.803
30
votes
4
answers

Is None less evil than null?

f# null nullpointerexception
asked 2010-12-17T10:01:25.343
105
votes
10
answers

Best way to check if an PowerShell Object exist?

powershell object null powershell-2.0
asked 2010-12-13T14:56:27.303
122
votes
16
answers

Java "?." operator for checking null - What is it? (Not Ternary!)

java syntax null
asked 2010-12-08T17:01:55.180
243
votes
9
answers

How to set enum to null

c# enums null nullable
asked 2010-12-02T16:20:34.800
62
votes
4
answers

How to insert 'NULL' values into PostgreSQL database using Python?

python postgresql null psycopg2 nonetype
asked 2010-11-20T06:21:50.357
159
votes
9
answers

Overriding == operator. How to compare to null?

c# .net null overloading operator-keyword
asked 2010-11-18T20:29:18.707
9
votes
6
answers

Cast to object before null check in overriding Equals

c# casting null equality
asked 2010-11-05T12:01:37.660
53
votes
8
answers

Safe dereferencing in Python

python groovy null nullpointerexception
asked 2010-10-31T21:00:34.790
15
votes
5
answers

Can't check if int is null

java dictionary null
asked 2010-10-30T14:14:56.417
111
votes
6
answers

Calling Java varargs method with single null argument?

null language-design java variadic-functions
asked 2010-10-26T21:10:09.347
10
votes
3
answers

Which constructor is chosen when passing null?

java constructor null
asked 2010-10-26T08:03:49.830
16
votes
2
answers

Why animating custom CALayer properties causes other properties to be nil during animation?

iphone animation properties calayer null
asked 2010-10-25T16:05:12.553
12
votes
6
answers

SQL And NULL Values in where clause

sql sql-server sql-server-2008 null
asked 2010-10-14T21:04:25.097
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