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  • Oracle: Finding Columns with only null values

    - by Jorge Valois
    I have a table with a lot of columns and a type column. Some columns seem to be always empty for a specific type. I want to create a view for each type and only show the relevant columns for each type. Working under the assumption that if a column has ONLY null values for a specific type, then that columns should not be part of the view, how can you find that out with queries? Is there a SELECT [columnName] FROM [table] WHERE [columnValues] ARE ALL [null] I know I COMPLETELY made it all up above... I'm just trying to get the idea across. Thanks in advance!

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  • Fragment savedInstanceState is always null (Android support lib)

    - by Evgeny Egorov
    I wrote a simple test project, but I cant understand why I always receive savedInstanceState = null in lifecycle methods onCreate, onCreateView and onActivityCreated. I change the screen orientation, see the log, but state not saved. Tell me please where is my mistake. Thanks. The code of fragment class is: public class TestFragment extends Fragment { private String state = "1"; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (savedInstanceState != null) { //never works state = savedInstanceState.getString("state"); } //always prints 1 Toast.makeText(getActivity(), state, Toast.LENGTH_SHORT).show(); return inflater.inflate(R.layout.fragment_layout, container, false); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString("state", "2"); Log.e("", "saved 2"); } }

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  • BitmapFactory.decodeResource returns null value

    - by krasnoff
    I am tring to load bitmaps from an internal resource in a View object (the source itself is in "drawable" files). the code is: import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.util.AttributeSet; import android.view.View; public class BannerView extends View { private Bitmap m_Banner = null; public BannerView(Context context, AttributeSet attributeSet) { super(context, attributeSet); m_Banner = BitmapFactory.decodeResource(getResources(), R.drawable.banner); } } Why m_Banner value is null? thank you in advance Kobi

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  • Which is the better way to simulate optional parameters in Java?

    - by froadie
    I have a Java method that takes 3 parameters, and I'd like it to also have a 4th "optional" parameter. I know that Java doesn't support optional parameters directly, so I coded in a 4th parameter and when I don't want to pass it I pass null. (And then the method checks for null before using it.) I know this is kind of clunky... but the other way is to overload the method which will result in quite a bit of duplication. Which is the better way to implement optional method parameters in Java: using a nullable parameter, or overloading? And why?

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  • Drupal - db_fetch_array returns NULL for every row

    - by darudude
    I'm using Drupal's db_fetch_array to fetch rows from my db_query. However, every row returned is equal to NULL. Typing the query into PHP myadmin works, so I have no idea whats going on. db_num_rows returns the number of rows as well. Here is the code: if(count($rebuild_ids)) { $ids=implode(",",$rebuild_ids); $type_stmt = "SELECT * from {" . ItemType::$type_table_name . "} where id IN ($ids)"; $new_items=db_query($type_stmt); if(!$new_items || db_num_rows($new_items) == 0) { return; } while($row = db_fetch_array($new_items)); { if ($row!=NULL) { echo "I work!" $game_items[] = $row['id']; ItemInstance::$nid_to_item_type_code[$row['nid']] = $row['id']; } } } However, it never gets into the third if statement (i.e. never echos "I work!") Any ideas?

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  • Acceptable name for extension method that accept null

    - by GaryX
    Hi, I really don't like to call String.IsNullOrEmpty(str). That makes me need to think "String" class first, then call it on the object "str". I like to call str.IsNullOrEmpty(), which doesn't need me to think "String" class. The problem is that extension method accept null instance to call on, which is not the usual case when you call a normal method. My question what do you think will be a convetion name for extension methods that accept null? For string, that is easy, "IsNullOrEmpty()" (anything that contains "IsNull") sounds good for me. For others, like GetDisplayName(), do we name it as "NullOrGetDisplayName" ?

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  • Checking sqlite datetime NULL with RoR

    - by Paul N
    RoR/SQL newbie here. My datetime column 'deleted_at' are all uninitialized. Running this query returns an error: SELECT * FROM variants v ON v.id = ovv0.variant_id INNER JOIN option_values_variants ovv1 ON v.id = ovv1.variant_id INNER JOIN option_values_variants ovv2 ON v.id = ovv2.variant_id INNER JOIN option_values_variants ovv3 ON v.id = ovv3.variant_id INNER JOIN option_values_variants ovv4 ON v.id = ovv4.variant_id WHERE v.deleted_at = NULL AND v.product_id = 1060500595 However, if I set my datetime values to 0, and set my query to v.deleted_at = 0, the correct variant is returned to me. How do I check for uninitialized/NULL datetimes?

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  • PHP radio button check if null

    - by Dallox
    So in class we get this school task where we need to check if one of the fields in unfilled and display an error. No we did this but for some strange reason it doesnt display a error when a radio button is unchecked. (textfield null check works fine) I've tried with a friend many possabilities but they all doesnt seem to work. We have been stuck at this task for 2 hours. Now we have tried making seperate if's but that doesnt seem to work too. These are the important parts: <p> <input type="hidden" name="taal" value="false"> Choose a language <input type="radio" name="taal" value="N"> Dutch <input type="radio" name="taal" value="E"> English <input type="radio" name="taal" value="S"> Spanish if (@$_POST['taal'] == null){ echo "No Language gotten"; return; }

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  • returning null or throwing an exception?

    - by MoKi
    I have the following types: typedef QPair < QTime , QTime > CalculatedTimeSlotRange; typedef QList < CalculatedTimeSlotRange > CalculatedTimeSlotRangeList; typedef QHash < quint8 , CalculatedTimeSlotRangeList > TimeSlotsTable; I have a function like the following: const CalculatedTimeSlotRangeList* TimeSlots::getCalculatedTimeSlotRangeList(const quint8 id) const { QHashIterator<quint8,CalculatedTimeSlotRangeList> it(mTimeSlotsTable); while (it.hasNext()) { it.next(); if(it.key() == id) { return &it.value(); } } return NULL; } as you can see my function returns a null if it fails to find a key that matches id. Is this correct? or should I just throw an exception if the key does not exist? how should i throw an exception for this situation?

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  • Using "as" and expecting a null return

    - by DrLazer
    For example. Lets say we have a stackpanel on a form. Its full of both Grids and Labels. I want to loop through all the Grids and do some operation on them but leave the Lables intact. At the moment I am doing it this way. foreach(UIElement element in m_stacker.Children) { Grid block = element as Grid; if(block != null) { //apply changes here } } So i'm using the fact that "as" returns null if it cannot cast into the required type. Is this an ok thing to do or is there a better solution to this problem?

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  • null pointer exception in textview of setcontent

    - by kitokid
    I am getting the java.lang.NullPointerException on createTabContent for the following code. There are two tabspecs. When I called and set the tab , changed the tabs for the first time it is ok. But when i called again while I am on the second tab, its hit the null pointer exception for line : NoStudentText.setVisibility(View.VISIBLE); I will show No Student Text if there is no data for the student list. It shows the text for the first time call. But If I do second time call to that tab, got the error. tspecStudent.setContent(new TabContentFactory() { public View createTabContent(String arg0) { if(listStudent != null && listStudent .size() > 0) { //show the student list } else { TextView noStudentText = (TextView)findViewById(R.id.NoStudentText); noStudentText.setVisibility(View.VISIBLE); return noStudentText; } } });

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  • Why is this C++ code working ?

    - by gregseth
    Why doesn't the program segfault on the p->info() call? struct A { int info() { retrun (this) ? 1 : -1; } }; int main() { A* p = NULL; if (p->info() == 1) { cout << "I'm alive!" << endl; } else { cout << "I'm NULL..." << endl; } return 0; }

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  • display data from tables that contain a null value

    - by user2631662
    I need the code below to say - if myReader reads a null entry a new method is called. At the moment it will not display data from tables that contain a null value conDataBase.Open(); myReader = cmdDataBase.ExecuteReader(); while (myReader.Read()) { if (myReader["Code_CodeID"] != DBNull.Value) { string sFirst = myReader["First"].ToString(); string sLast = myReader["Last"].ToString(); string sAdd1 = myReader["Address1"].ToString(); string sCode = myReader["Code"].ToString(); txtFirst.Text = sFirst; txtSecond.Text = sLast; txtadd1.Text = sAdd1; txtDeviceIMEI.Text = sCode; } } } else { //go to a new method } }

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  • String[] initialized by null???

    - by Esmond
    Hi i encountered this problem whereby when i initialized my String[], there seems to be a null in the String[] before i do anything. How do i initialized the String[] to be completely empty,i.e. without the null at the start? The output for the following code is: nullABC nullABC nullABC nullABC nullABC public static void main(String[] args){ String[] inputArr = new String[5]; for (int i = 0; i< inputArr.length; i++){ inputArr[i] += "ABC"; } for (int i = 0; i< inputArr.length; i++){ System.out.println(inputArr[i]); } } }

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  • How do you write a macro for a special character in LibreOffice?

    - by JasperKov
    Does anyone know how to write a macro for a special character? I know LibreOffice currently doesn't have a way to set a special character to a keyboard shortcut. However, I want to work around this with a macro. My plan is to create a macro for a special character then set a keyboard shortcut to that macro. Problem is I don't know the first thing about writing a macro. Any one have a template or something that works? I also know about the compose key, but I guess I am lazy and want to actually insert special characters with as few keys as possible.

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  • The ':' character, hexadecimal value 0x3A, cannot be included in a name

    - by coure06
    I have an xml file that contains its element like <ab:test>Str</ab:test> When i am trying to access it using the code XElement tempElement = doc.Descendants(XName.Get("ab:test")).FirstOrDefault(); Its giving me error System.Web.Services.Protocols.SoapException: Server was unable to process request. --- System.Xml.XmlException: The ':' character, hexadecimal value 0x3A, cannot be included in a name. How shld i access it?

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  • mysql match against hebrew

    - by Devenv
    Hey, Trying to solve this for a very long time now... SELECT MATCH(name) AGAINST('??????') (hebrew) doesn't work, but SELECT MATCH(name) AGAINST('abraxas') SELECT MATCH(name) AGAINST('????????') (english, russian) work perfectly. I know it's something with character-set, but I tried all kind of settings and it didn't work. For now it's latin-1. LIKE works I'm pretty much sure that any weird language like arabic etc won't work...

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  • iterate through a character series

    - by esryl
    I want to iterate through all 5 character combinations of 0-9, a-z. I worked it at to be around 52 millions combinations. How can I programatically iterate through all the possibilities in PHP? - like counting up or something?

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  • Internet Explorer: Error Message: 'nodeType' is null or not an object

    - by Patrick
    hi, I get the following error in IE Line: 173 Character: 5 Code: 0 Error Message: 'nodeType' is null or not an object This is the line of code where it crashes: if($clone.attr("nodeType") == 1 && !$clone.hasClass("dontend")){ website: http://www.donatellabernardi.ch/drupal/ I've debugged the attribute nodeType in Firebug and the output is always "1". thanks

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  • stdout and stderr character encoding

    - by Muhammad alaa
    i working on a c++ string library that have main 4 classes that deals with ASCII, UTF8, UTF16, UTF32 strings, every class has Print function that format an input string and print the result to stdout or stderr. my problem is i don't know what is the default character encoding for those streams. for now my classes work in windows, later i'll add support for mac and linux so if you know anything about those stream encoding i'll appreciate it. thank you.

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