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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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• How can I determine new & previous cell value on SheetChange event in Excel?

  - by Falco Foxburr

  I have some special cells in my Excel workbooks which are managed by my Excel Add-in. I want to prevent users from changing content of those cells, but I also want to know, what value users wanted to enter to those cells. On the SheetChange event I can check what users entered to my special cells, but how do I determine the PREVIOUS value in those cells and REVERT user changes? It is not a solution for me. If I lock cell in Excel, it becomes read-only - user can not even try to enter anything to this cell - Excel popups warning dialog in this case. My problem is that I want to catch what user entered to my cell, do something with this value, and then revert cell content to original value.

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• Why I cant be able to change the UITableViewCell detailTextLabel's frame (just the label's position)?

  - by Simon

  Hi.. I am having a table view with default UITableViewCell of style UITableViewCellStyleValue2. I just want to move detailTextLabel few pixels to the right. I know it makes no sense to adjust its width and height :). I am trying to set detailTextLabel's frame with my x and y value. But its not affecting the its frame. I prefer to use default UITableViewCell, in this case, over a customized cell because the default UITableViewCell automatically manages the text alignment and centering of the labels.. How to change UITableViewCell detailTextLabel's frame? Am I allowed to change its frame? Thanks everyone..

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• MYSQL - SQL query Getting single record for the similar records and populating other columns with which has more length

  - by Bujji

  Here is my case , I have a database table with below fields name place_code email phone address details estd others and example data if you look at the above example table First three records are talking about XYZ and place code 1020 . I want create a single record for these three records based on substring(name,1,4) place_code ( I am lucky here for all the similar records satisfies this condition and unique in the table .) For the other columns which record column length has max . For example again for the above 3 records email should be [email protected] , phone should be 657890 and details should be "testdetails" This should be done for all the table . (Some has single records and some has max 10 records ) Any help on query that helps me to get the desired result ? Thank You Regards Kiran

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• hunting maven dependencies

  - by Tom

  I want to start using maven in code I distribute but I can't find an efficient way to work with dependencies. Every new dependency takes me far too long to add. As a simple example, I need to add Tomcat for compilation. Do I really have to manually trawl the repo in my browser to find the group-id, artifact-id and version number? In every case it seems easier to find the non-maven downloads. I hope I've missed something obvious.

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• Text in gtk.ComboBox without active item

  - by Yotam

  The following PyGTk code, gives a combo-box without an active item. This serves a case where we do not want to have a default, and force the user to select. Still, is there a way to have the empty combo-bar show something like: "Select an item..." without adding a dummy item? import gtk import sys say = sys.stdout.write def cb_changed(w): say("Active index=%d\n" % w.get_active()) topwin = gtk.Window() topwin.set_title("No Default") topwin.set_size_request(0x100, 0x20) topwin.connect('delete-event', gtk.main_quit) vbox = gtk.VBox() ls = gtk.ListStore(str, str) combo = gtk.ComboBox(ls) cell = gtk.CellRendererText() combo.pack_start(cell) combo.add_attribute(cell, 'text', 0) combo.connect('changed', cb_changed) ls.clear() map(lambda i: ls.append(["Item-%d" % i, "Id%d" % i]), range(3)) vbox.pack_start(combo, padding=2) topwin.add(vbox) topwin.show_all() gtk.main() say("%s Exiting\n" % sys.argv[0]) sys.exit(0)

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• EF Stored Procedure Complex Type

  - by Web Dev

  I am using EF4. I am somewhat confused on on the Entity Framework Complex name. When I go to Functional Import of a Stored Procedure name and it ask me to type in the Complex name, is that supposed to be the name of of a class that can handle that output. For examle, say if my stored procedure returns FirstName, LastName. Is the Complex name supposed to be a class that can handle that output in this case PersonName? public class PersonName { public string FirstName {get; set;} public string LastName {get;set} }

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• [C++] Boost test: catch user defined exceptions

  - by user231536

  If I have user defined exceptions in my code, I can't get Boost test to consider them as failures. For example, BOOST_AUTO_TEST_CASE_EXPECTED_FAILURES(MyTest,1) BOOST_AUTO_TEST_CASE(MyTest) { // code which throws user defined exception, not derived from std::exception. } I get a generic message: Caught exception: .... unknown location(0):.... It does not recognize this error as a failure since it is not a std::exception. So it does not honor the expected_failures clause. How do I enforce that the piece of code should always throw an exception? THis seems to be a useful thing to want. In case future code changes cause the code to pass and the exception is not thrown, I want to know that.

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• which type is best for three radiobuttons?

  - by Manog

  Maybe you consider this question trivial but im just curious what is your opinion. I have three radiobuttons. "Show blue", "Show red" and "Show all". I did it with nullable boolean. There is collumn in database where blue is 0 and red is 1 so in metode i have to translate bool to int to compare those values (i do it in c#).Of course it works, but i wonder if it is the best solution. And question is wich type is best in this case? nullable bool, int, or maybe string?

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• retrieving data from memcache

  - by Adnan

  Hello, I am starting to learn the benefits of memcache, and would like to implement it on my project. I have understood most of it, such as how data can be retrieved by a key and so on. Now I get it that I can put a post with all of its details in memcache and call the key POST:123, that is OK, and I can do it for each post. But how to deal with the case when I query the table posts to get the list of all posts with their titles. Can this be done with memcache, or should this always be queried from the table?

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• One-to-many relationship related to many tables

  - by Andrey

  I have a scenario where: there are two (or more) tables that represent independent items. lets say Users and Companies Both of these tables need addresses stored. Each one can have one or more address In a normal 1 to many scenario Addresses table woudl just have a UserId or a CompanyId creating a normal 1 to many relationship. In this case i have a few approaches i can think of the Addresses table could have both a UserId and a CompanyId and only one would be used for each record. 2 keys could be used ObjectId and ObjectType So Object id would have a UserId or a CompanyId, and ObjectType woudl be User or Company Create an ObjectTable and add ObjectId to Users and Companies. Addresses would then have an OjbectId I do not really like any of these solutions. i am wondering what is the best approach here. On another note i will most likely user linqtosql for my data access layer.

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• Javascript Pointers question with Dates

  - by Mega Matt

  I noticed this situation in my code (unfortunately), and was able to duplicate it in my own JS file. So I have this code: var date1 = new Date(); // today var date2 = date1; date2 = date2.setDate(date2.getDate() + 1); // what is date1? After this code executes, date1 is today's date + 1! This harkens back to my undergrad days when I learned about pointers, and I guess I'm a little rusty. Is that what's happening here? Obviously I've moved the assignment away from date1, and am only modifying date2, but date1 is being changed. Why is this the case? Incidentally, after this code executes date2 is a long number like 1272123603911. I assume this is the number of seconds in the date, but shouldn't date2 still be a Date object? setDate() should return a Date object... Thanks for the help.

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• create uiviewcontroller programmically

  - by pankaj

  hi, I am working in a app where i have data in uitableview. It is like a drill down application. User will click on a row and will go to next page showing more records in a uitableview. But problem in my case is that i dont know upto how many level user can drill. The number of levels are not fixed. So now i am thinking to create and add the viewcontrollers programically. Is it possible?? if yes how? thanks in advance.

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• Will a source-removal sort always return a maximal cycle?

  - by Jason Baker

  I wrote a source-removal algorithm to sort some dependencies between tables in our database, and it turns out we have a cycle. For simplicity, let's say we have tables A, B, C, and D. The edges are like this: (A, B) (B, A) (B, C) (C, D) (D, A) As you can see, there are two cycles here. One is between A and B and another is between all four of them. Will this type of sort always choke on the largest cycle? Or is that not necessarily the case?

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• WeakHashMap iteration and garbage collection

  - by Shamik

  I am using a WeaekHashMap to implement a Cache. I am wondering if I am iterating over the keys of this map, and at the same time garbage collector is actively removing keys from this map, would I receive a ConcurrentModificationException ? I do not think so, because as far as I understand, concurrentmodificationexception happens because of bugs in the application code where the developer forgot to understand that the same map is shared/used by other threads and in this case, it should not happen. But wondering how would JVM handle this when WeakHashMap is not synchronized ?

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• Parse and Break: why break cannot be used for getting out of "any" or "some" rule ?

  - by Rebol Tutorial

  Let say I have to parse a hierarchical set of tags <tag> <subtag1 attr1=value1 attr2=value2> <subtag1 attr1=value1 attr2=value2> <subtag1 attr1=value1 attr2=value2> </tag> Why can't I use break inside some or any to get out of a level hierarchy ? This would allow to do that kind of parsing instead of having a headache to do so ? I'm asking this because I read here http://www.codeconscious.com/rebol/parse-tutorial.html it would create an infinite loop This case produces an infinite loop. Because the BREAK is within a sub-rule of the rule that SOME is processing. The BREAK does not affect success/failure status or the input pointer - it just exits a rule early: rule-to-break: [(print "Break") break] == [(print "Break") break] parse "X" [some [rule-to-break] "X"] Break *Break* ... Break *Break*(escape)

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• An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING cla

  - by brz dot net

  I have to find the indentid from the status table based on below two conditions: 1. If there are more than one record having same indentid in status table and the same indentID has count1 in feasibilitystatus table then I don't want to display the record. 2. If there is only one record of indentid in status table and the same indentID has count0 in feasibilitystatus table then I don't want to display the record. Query: select distinct s.indentid from status s where s.status='true' and s.indentid not in(select case when count(s.indentid)>1 then (select indentid from feasibilitystatus group by indentid having count(indentid)>1) else (select indentid from feasibilitystatus group by indentid having count(indentid)>0) end as indentid from status) Error: An aggregate may not appear in the WHERE clause unless it is in a subquery contained in a HAVING clause or a select list, and the column being aggregated is an outer reference.

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• How do I get broadcast to work with djcelery+ghettoq

  - by user560833

  I am using djcelery 2.1.4 with ghettoq 0.4.5 and django 1.2.3 and I am able to run tasks all day long, but when I try to use any broadcast functionality it fails without errors. Take the simplest case -- I run celeryd: python manage.py celeryd The daemon starts and I try to run a ping: >>> from celery.task.control import ping >>> ping() [] I can see the message that ping created appear in the database, but apparently none of the nodes are picking it up? Am I doing something wrong here? Does broadcast not work with carrot?

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• how to redirect on youtube in androi

  - by rajshree

  public class MovieDescription extends Activity { Vibrator vibrator; TextView tv_title,tv_year,tv_banner,tv_desc; RatingBar ratingBar; ImageView iv_watch,iv_poster; private static final String TAG_CONTACTS = "Demo"; private static final String TAG_ID = "id"; private static final String TAG_TITLE = "title"; private static final String TAG_YEAR = "year"; private static final String TAG_RATING = "rating"; private static final String TAG_BANNER= "category"; private static final String TAG_DESC = "description"; private static final String TAG_URL = "url"; private static final String TAG_POSTER = "poster"; String id,title,year,rating,banner,description,poster, movieUrl; static JSONArray contacts = null; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.movie_description); initialize(); String movieDescUrl = "http://vaibhavtech.com/work/android/movie_description.php?id="+MainActivity.movie_Id; MovieDescriptionParser jParser = new MovieDescriptionParser(); JSONObject json = jParser.getJSONFromUrl(movieDescUrl); try { contacts = json.getJSONArray(TAG_CONTACTS); for (int i = 0; i < contacts.length(); i++) { /**********************************Value Parse FromUrl**********************************/ JSONObject c = contacts.getJSONObject(i); id = c.getString(TAG_ID); title = c.getString(TAG_TITLE); year = c.getString(TAG_YEAR); rating = c.getString(TAG_RATING); banner=c.getString(TAG_BANNER); description = c.getString(TAG_DESC); movieUrl = c.getString(TAG_URL); poster = c.getString(TAG_POSTER); /**********************************Valeu Assing to UI Component**********************************/ Log.i(id, title); } } catch (JSONException e) { e.printStackTrace(); } tv_title.setText(title); tv_year.setText(year); tv_banner.setText(banner); tv_desc.setText(description); Float rat=Float.parseFloat(rating); ratingBar.setRating(rat); Bitmap bimage= getBitmapFromURL("http://vaibhavtech.com/work/android/admin/upload/"+poster); iv_poster.setImageBitmap(bimage); iv_watch.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub vibrator.vibrate(40); LayoutInflater inflater=getLayoutInflater(); View view=inflater.inflate(R.layout.customtoast,(ViewGroup)findViewById(R.id.custom_toast_layout)); Toast toast=new Toast(getApplicationContext()); toast.setDuration(Toast.LENGTH_LONG); toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0); toast.setView(view); toast.show(); Intent intent=new Intent(Intent.ACTION_VIEW); intent.setData(Uri.parse(movieUrl)); startActivity(intent); } }); } @Override public boolean onCreateOptionsMenu(Menu menu) { // TODO Auto-generated method stub int currentapiVersion = android.os.Build.VERSION.SDK_INT; Log.i("Device Versoin is", ""+currentapiVersion); if (currentapiVersion >= android.os.Build.VERSION_CODES.JELLY_BEAN){ ActionBar actionBar = getActionBar(); actionBar.setHomeButtonEnabled(true); actionBar.setDisplayHomeAsUpEnabled(true); getMenuInflater().inflate(R.menu.main, menu); } return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case android.R.id.home: onBackPressed(); return true; case R.id.home: Intent intent = new Intent(this, MainActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(intent); Log.i("Home", "Press"); return true; } return super.onOptionsItemSelected(item); } public void initialize() { tv_banner=(TextView) findViewById(R.id.tv_movie_description_banner); tv_desc=(TextView) findViewById(R.id.tv_movie_description_decription); tv_title=(TextView) findViewById(R.id.tv_movie_description_name); tv_year=(TextView) findViewById(R.id.tv_movie_description_year); ratingBar=(RatingBar) findViewById(R.id.ratingBar1); iv_watch=(ImageView) findViewById(R.id.iv_movie_description_watch); iv_poster=(ImageView) findViewById(R.id.iv_movie_description_poster); vibrator=(Vibrator)getSystemService(Context.VIBRATOR_SERVICE);; } public static Bitmap getBitmapFromURL(String src) { try { Log.i("src",src); URL url = new URL(src); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setDoInput(true); connection.connect(); InputStream input = connection.getInputStream(); Bitmap myBitmap = BitmapFactory.decodeStream(input); Log.i("Bitmap","returned"); return myBitmap; } catch (IOException e) { e.printStackTrace(); Log.e("Exception",e.getMessage()); return null; } } } when i am clciking on watch now button its giving me 4 options -by mozilz,by chrome,by youtube, i want that when i click on watch now button it get redirect on youtube url link,..how can i do this please give me any suggetion.:(

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• Can't use MySQL extract() function in the WHERE clause.

  - by UkraineTrain

  I've run the following query: UPDATE main_table, reference_table SET main_table.calc_column = (CASE WHEN main_table.incr = "6AM" THEN reference_table.col1+reference_table.col2+... WHEN main_table.incr = "12AM" THEN reference_table.col7+reference_table.col8+... WHEN main_table.incr = "6PM" THEN reference_table.col13+reference_table.col14+... ELSE reference_table.col19+reference_table.col20+...) WHERE main_table.month = extract(month from reference_table.thedate) AND main_table.day = extract(day from reference_table.thedate) I've used extract() function since my reference_table doesn't have month and day columns but has the date column named thedate. I've used the extract() function on the reference_table many times before successfully, so, I know that there's nothing wrong with my extract function syntax. However, in this instance, MySQL complains. It probably has to do with the fact that I've used in the WHERE clause. I know that this issue could get fixed if I added the month and day columns to the reference_table to avoid using the extract() function. However, I'm very reluctant to do that and would like to avoid it. How can I make it work?`

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• cache_counter for habtm

  - by piemesons

  Hello How can use cache_counter in a habtm. For example a question has many tags and a tag can belong to many questions. question habtm tags Now i want to find out number of questions belonging to every tag. One way is counting everytime. But, in case of one_to_many i done same thing in this way. Like one question has many answers. then in answer model i specified belongs_to :question,:cache_counter=>true It solved my problem. So how to do the same in habtm.

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• How do I rotate a single object on an html 5 canvas?

  - by Kappers

  I'm trying to figure out how to rotate a single object on an html 5 canvas. For example: http://screencast.com/t/NTQ5M2E3Mzct - I want each one of those cards to be rotated at a different degree. So far, all I've seen are articles and examples that demonstrate ways to rotate the entire canvas. Right now, I'm guessing I'll have to rotate the canvas, draw an image, and then rotate the canvas back to it's original position before drawing the second image. If that's the case, then just let me know! I just have a feeling that there's another way. Anyone have any idea? Thanks in advance!

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• Do fields need to be explicitly final to have a "proper" immutable object?

  - by Yishai

  You often read about immutable objects requiring final fields to be immutable in Java. Is this in fact the case, or is it simply enough to have no public mutability and not actually mutate the state? For example, if you have an immutable object built by the builder pattern, you could do it by having the builder assign the individual fields as it builds, or having the builder hold the fields itself and ultimately return the immutable object by passing the values to its (private) constructor. Having the fields final has the obvious advantage of preventing implementation errors (such as allowing code to retain a reference to the builder and "building" the object multiple times while in fact mutating an existing object), but having the Builder store its data inside the object as it is built would seem to be DRYer. So the question is: Assuming the Builder does not leak the Object early and stops itself from modifying the object once built (say by setting its reference to the object as null) is there actually anything gained (such as improved thread safety) in the "immutability" of the object if the object's fields were made final instead?

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• What happens when a OSGi service using JNI is unregistered while in use?

  - by schngrg

  As I understand, OSGi services can be unregistered anytime, including when they are in use. Consider an OSGi service which internally makes a long-running JNI call. And while that JNI call is executing, the service is unregistered by OSGi. Will the JNI call be allowed to finish or terminated mid-way? What if it was just a normal non-jni long running Java call? Will that call be allowed to finish execution or will OSGi terminate everything immediately and unregister? What is the expected behavior in such a case? Does the expected behavior depend on if the service was loaded using a 'tracker' or not? SG

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• Regex if-else expression

  - by craig

  I'm trying to extract the # of minutes from a text field using Oracle's REGEXP_SUBSTR() function. Data: Treatment of PC7, PT1 on left. 15 min. 15 minutes. 15 minutes 15 mins. 15 mins 15 min. 15 min 15min 15 In each case, I'm hoping to extract the '15' part of the string. Attempts: \d+ gets all of the numeric values, including the '7' and '1', which is undesirable. (\d)+(?=\ ?min) get the '15' from all rows except the last. (?((\d)+(?=\ ?min))((\d)+(?=\ ?min))|\d+), an if-else statement, doesnt' match anything. What is wrong with my if-else statement?

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