I want to check how many fields of an object are null. Can I do something like: int numNotNull = !!(obj.a) + !!(obj.b) + !!(obj.c) + !!(obj.d); This would work if null was a pointer to the 0 address, as in C.For a good understanding of what null is i
I have the below method, which I need to check for whether the arguments are empty or null. public DB Where(string field, string operat, string value, string andOr, string field2, string operat2, string value2) { _Where = " WHERE " + field + &qu
This question already has an answer here: What is the difference between a variable, object, and reference? [duplicate] 5 answers What happens if I do: Object obj = new Object(); obj = null; Does it remove the object from memory, or clear just the re
I grep for a word/pattern in a file, if such a pattern doesn't exist in a file, then I want to print/echo "-". Can we do this on command line in a single lined command? grep word <file> | <command to return "-" if "word&q
Using gcc 5.2.0, I noticed that this code does not generate a warning: #include <stddef.h> int function(void) { return NULL; } void procedure(void) { return NULL; } I used the flags -Wall -Wextra -std=c99 -pedantic and I am running archlinux. I am n
I want to assign a null value to a variable called $dec but it gives me errors, here is my code: import-module activedirectory $domain = "domain.example.com" $dec= null Get-ADComputer -Filter {Description -eq $dec} These are automatic variables,
I am going to count the checked and unchecked check box in my attendance but that come out in my code."Operator '=' is not defined for type 'DBNull' and type 'Boolean'.??"... pls help..your help is greatly appreciated. thanks my code: Next Dim P
In the lines marked with $ show the following message: Multiple markers at this line - Null pointer access: The variable InformeSalvaguardasAGR can only be null at this location - Null pointer access: The variable InformeSalvaguardasAGR can only be n
I have a form with a collection of forms in which I want to chain two drop boxes with an event. I do not manage to make the event listener to work as I get a null value when I call $data->getCursValutar(). Here is the code: <?php namespace Mnv\CoreB
Okay I have a huge problem with this. I have spend hours with my group trying to solve this small problem we have on the group project and cant find the answer I either get null pointer exeption or something with org.apache.jasper.jasperexception or
I've got a Ruby program that parses XML from a website and now and again it crashes when one of the elements is nil. I've implemented the following code to handle it but it doesn't seem to work; begin data[6]= element.elements["company_info"].el
I'm trying to save datas in a hash map and retrieve it. The value corresponding to the key is present and it still returns null. I have implemented the equals() and hashCode() methods also. ArrayList<Friends> friendsArrayList = new ArrayList<Frie
I read somewhere that gcc 4.6 implemented the c++11 null_ptr. I have 4.8 but I can only find std::nullptr_t (which doesnt seem to work the same). What do I need to do/include to use null_ptr in g++ 4.8?std::nullptr_t is the type, and it is available
I'm using Casbah to connect to and query a Mongo database. Right now I'm trying to query on fields where the value is not null. Using straight Mongo syntax, the query I'm wanting would be collection.find({"key" : {$ne : null }} ) In casbah, I've
I know this is a very simple question but I just wanted to be sure. I have a Null value in a field, and I want to change that Null value. To change the Null Value Do I use Insert or update? For Example: Insert Into dataTable (Column 1) Values (1) WHE
I have a peace of code that is poorly written, like so: HashMap<String, TceFile> mapPresetLastKdf = new HashMap<String, TceFile>( (HashMap<String, TceFile>) RsessionVars.get( sessionVars, Constants.SVAR_ENC_PRESET_LAST_KDF_MAP ) ); HashM
I have a webservice from where I retrieve informations before updating a database. I have to search for some values before inserting them, if i found them, obviously I will not insert them the xml should be like this: <?xml version="1.0" enco
I have a field named size. Some rows are null. I want to update these rows' size field to 0. How I'll do it? update tablename set size = 0 where size is null;
I have three classes: a Main, a Player and a Car. The main creates a Car and a Player. The Car needs to trace the player's x position. But the code below is not working. I have researched and found that declaring it as static should fix the problem a
I am trying to position a JButton with a null layout but it will not show up, if i switch to gridlayout they are only lined up in the middle no matter what i change. How can i set the position and size of my button? In Frame package Run; import javax
I have a OneToMany relationship: public class Class1{ private String attr1; private String attr2; @OneToOne private Class2 object1; } public class Class2{ private String attr3; } The relationship can store null objects (I mean that an instance of Cla
I thought methods such as name and email were default in rails? In my static pages view, in profile.html.erb I have: <% if logged_in? %> <% provide(:title, @user.name) %> <% else %> <% provide(:title, 'Profile')%> <% end %> I
Is there any way to get a type of the null value? This does not work: let a: string = null let typ = a.GetType() Thanks let getStaticType<'T>(_x : 'T) = typeof<'T> let a : string = null let b : int[] = null let typ1 = getStaticType a let typ2
<%= msg.average_rating %> used to return either NaN or a number: NaN if the msg had recieved no ratings or the average of all the ratings the message had recieved. But now it returns nil can't be coerced into Fixnum. I must have done something to br
I've been writing JavaScript for quite a long time now, and I have never had a reason to use null. It seems that undefined is always preferable and serves the same purpose programmatically. What are some practical reasons to use null instead of undef
I have a simple class which has a ToString implemented which I am happy with the content. I am trying to decide what is the (most) correct way by seeing if there are any pro's/con's for the various options. For the example below: Class: Astronaut Var
I'm using CodeIgniter's Active Record class to query the MySQL database. I need to select the rows in a table where a field is not set to NULL: $this->db->where('archived !=', 'NULL'); $q = $this->db->get('projects'); That only returns this qu
I have got a field with data type int? price and allow null, when I set book.price = null; and update, it is not saved and does not throw any exceptions, when I change value # null, it is ok. I want set it null.Make sure the field is nullable in the
I am a little confused about null values and variables in .NET. (VB preferred) Is there any way to check the "nullness" of ANY given variable regardless of whether it was an object or a value type? Or does my null check have to always anticipate
In Java, it is very easy to code the following design: public abstract class Pizza { public static final Pizza.NULL = new Pizza() { /* "null" implementations */ } /* actual/abstract implmentations */ } What is the preferred method to attain the
