Hi, I've added a column to a db in rails via a migration, and updated new.html.erb to add the field to the form. The correct data is in the request params, but the insert query that is generated has a null for the column every time. Here are the request params: {"commit"=>"Create", "assignment"=>{"start_date"=>"08/04/2010", "proj...
Taken from one of my previous questions. Table is telling on which item (post , photo or reply) the comment is taking place on. commentid ---- postid ----- photoid-----replyid ----------------------------------------------- 1 22 NULL NULL 2 NULL 56 NULL 3 23...
Why is this query returning 0 rows? select t.f1, t.f2 from (select null f1, 'a' f2 from dual) t where t.f1<>t.f2; This is a distilled version of a complex query I have. I want to compare two tables containing one-to-one related data and I want to select those rows that contain different values for certain fields. But also there can be...
I have a class like so, that I create myself somewhere in my code: class StarryEyes { @Inject MyValidator validator; public StarryEyes(String name) { //.. } public doSomething() { // validator is NULL } } I want Guice to inject an instance of validator, which has a @Singleton annotation. I have a module th...
While browsing the MSDN documentations on Equals overrides, one point grabbed my attention. On the examples of this specific page, some null checks are made, and the objects are casted to the System.Object type when doing the comparison : public override bool Equals(System.Object obj) { // If parameter is null return false. if ...
How do I display a random set of list items, I think I have this down. Thanks! //Count the number of li's in the object var listCount = $("li.contentBlock", obj).length; //Generate a random number from the count of li's var randomListNumber = Math.floor(Math.random() * listCount -1); //Gener...
It was a very fast and makeshift, bug fix.. It worked, but I would like to find a better understanding and solution. This was the Class Constructor generating the leak final transient DataInputStream din; final transient DataOutputStream dout; final transient BufferedReader bin; final transient BufferedWriter bout; NData(Socket s...
Ok here goes: I have a table with id ( can be duplicate but not NULL ) and value ( can be duplicate and NULL ) id value ----- ----- 1 red 1 red 1 (null) 2 blue 2 blue 3 (null) So how do I return the id's and value's of all the records that have a value, but if a null value is also found don'...
Hey, So if I had a table in my database with the values 1 2 3 4 NULL And I executed the query SELECT MAX(col1) FROM <table> I'd get 4. Is there any way to change this so Null would be treated as the maximum as oppose to the minimum? Thanks! ...
Hello, When get UIImage that came from UIImagePickerController's photo library, i get white image, why is that? tnx ...
I have the following code snippet: std::vector< boost::shared_ptr<Foo> >::iterator it; it = returnsAnIterator(); // often, it will point to a shared_ptr that is NULL, and I want to test for that if(*it) { // do stuff } else // do other stuff Am I testing correctly? The boost docs say that a shared_ptr can be implicitly converted ...
Hi guys.. I am building a AS3 only project and got runtime error that said "Cannot access a property or method of a null object reference." Here is my code: main.as public class videoMain extends Sprite{ private var videoPlayer:Player; public function videoMain (){ loadPlayer() loadProgres...
I've been working through this for a while and I'm missing the obvious. I'm trying to make sure that if a textbox value is left blank an error isn't thrown and instead a simple message is displayed in the textbox. However, what I've got and several other methods I've tried similar to this haven't worked. I can't figure out why this is...
This is my code, it always falls into the else even when I know that the value going in (via debugger) is emtpy. name = cursor.getString(cursor.getColumnIndex("Genus")) + " " + cursor.getString(cursor.getColumnIndex("Species")); if(name != "" && name != null) tv.setText(name); else tv.setText("Error"); ...
There is a null error, and i've been trying to solve it for 2 days. Booking.java package one.two; import android.app.Activity; import android.database.Cursor; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.SimpleCursorAdapter; import android.widget.Spinner; import android.w...
Hi, I would like some help (and I'm new to this site) I want a typewriter-effect. So that it looks like the code in the string is typed character by character (for an animation). However, I get a #1009 back. It talks about a null object reference (the error is in Dutch). My dynamic text field is in the same scene, on a different layer...
Is it correct that a instance method can be called on a null reference in IL..? Is there any example to show this..? ...
I'll try to avoid describing the background here. I now have a query result (not a table) which contains rows like this: ID SP1 SP2 SP3 SP4 SP5 SP6 SP7 SP8 1 null null 2500 1400 700 null null null There may be leading and/or trailing null values around a section of non-null v...
Hi. Let's say I'd like to perform the following command: house.getFloor(0).getWall(WEST).getDoor().getDoorknob(); To avoid a NullPointerException, I'd have to do the following if: if (house != null && house.getFloor(0) && house.getFloor(0).getWall(WEST) != null && house.getFloor(0).getWall(WEST).getDoor() != null) ... Is there a...
I have the following line of code --> var selectedDomainID = lkuDomainType.EditValue.Equals(null) ? string.Empty : lkuDomainType.EditValue; that is, sometimes, generating a NullReferenceException What I don't understand is why. Isn't the whole point of my code to check for null and if so assign string.empty?? When I check in DEBUG ...