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• How to write such a stored function in MySQL?

  - by user198729

  The function essentially contains 2 statements: statement1; and statement2; If statement1 fetches some records,just return them as result;If it doesn't fetch any result,return the result of statement2.

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• Ternary operators in C#

  - by pm_2

  With the ternary operator, it is possible to do something like the following (assuming Func1() and Func2() return an int: int x = (x == y) ? Func1() : Func2(); However, is there any way to do the same thing, without returning a value? For example, something like (assuming Func1() and Func2() return void): (x == y) ? Func1() : Func2(); I realise this could be accomplished using an if statement, I just wondered if there was a way to do it like this.

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• How to implement callback functions inside classes (PHP)

  - by sombe

  I need to use a class callback method on an array inside another method (the callback function belongs to the class). class Database { public function escape_string_for_db($string){ return mysql_real_escape_string($string); } public function escape_all_array($array){ return array_filter($array,"$this->escape_string_for_db"); } } Is this the right way to go about that? (I mean, in terms of the second parameter passed to array_filter)

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• How to get the ID of the last insert.

  - by James Jeffery

  I have an application and around 20 accounts are created per minute (on average). I need to implement a new feature which requires the ID of the last insert. I am using PDO. The question is, lets say 5 users create accounts at exactly the same time. Will it return the ID from the database for that users profile that was just created, or will it return the last insert? If you get what I mean.

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• Test if a method is an override?

  - by Water Cooler v2

  Is there a way to tell if a method is an override? For e.g. public class Foo { public virtual void DoSomething() {} public virtual int GimmeIntPleez() { return 0; } } public class BabyFoo: Foo { public override int GimmeIntPleez() { return -1; } } Is it possible to reflect on BabyFoo and tell if GimmeIntPleez is an override?

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• unprotected access to member in property get

  - by Lenik

  I have a property public ObservableCollection<string> Name { get { return _nameCache; } } _nameCache is updated by multiple threads in other class methods. The updates are guarded by a lock. The question is: should I use the same lock around my return statement? Will not using a lock lead to a race condition?

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• What's the benefit of function refrence?

  - by SpawnCxy

  When I reading the code of CodeIgniter,I found some functions written as follows: function &get_instance() { global $CI, $OBJ; if (is_object($CI)) { return $CI; } return $OBJ->load; } I can understand variable refrence,but I can hardly get this through.Is it necessary to use this function style?And any benefit? Thanks.

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• Preg_match if a string beginns with "00"{number} or "+"{number}

  - by streetparade

  Hy i have to test if a string begins with 00 or with + Say i have the string 0090 or +41 if the string begins with 0090 return true, elseif string begins with +90 replace the + with 00 else return false The last two digits can be from 0-9 How do i do that in php? I hope i could explain my question clear?

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• Python how to convert this for loop into a while loop

  - by user1690198

  I have this for a for loop which I made I was wondering how I would write so it would work with a while loop. def scrollList(myList): negativeIndices=[] for i in range(0,len(myList)): if myList[i]<0: negativeIndices.append(i) return negativeIndices So far I have this def scrollList2(myList): negativeIndices=[] i= 0 length= len(myList) while i != length: if myList[i]<0: negativeIndices.append(i) i=i+1 return negativeIndices

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• How to find where error is.

  - by gurugio

  How can I find where the error occurs? In C language, the return value means what error occurs, such as failure to open file or memory allocation. There is no information where the error occurs. For example, function 'foo' calls A,B,C,D. If foo returns an error value, it might be return value of A or B or C or D. I cannot find what function returns error. I have to run debugger or add some codes to find what function returns error.

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• Problem with generics

  - by jess

  I have this code in base class protected virtual bool HasAnyStuff<TObject>(TObject obj) where TObject:class { return false; } In child class I am overriding protected override bool HasAnyStuff<Customer>(Customer obj) { //some stuff if Customer.sth etc return false; } I am getting this error '''Type parameter declaration must be an identifier not a type''' What is it I am doing wrong here?

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• .split("1px") into ["1px",1,"px"] in Javascript

  - by Jay

  I'm rubbish at Regular Expressions, really! What I'd like is to split a string containing a CCS property value into an array of [string,value,unit]. For example: if I supplied the .split() method with 1px it'd return ["1px",1,"px"]. If I were to supply, similarly, 10% it'd return ["10%",10,"%"]. Can this be done? I appreciate all your help!

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• How to detect invalid image URL with JAVA?

  - by Cataclysm

  I have a method to download image from URL. As like below.. public static byte[] downloadImageFromURL(final String strUrl) { InputStream in; ByteArrayOutputStream out = new ByteArrayOutputStream(); try { URL url = new URL(strUrl); in = new BufferedInputStream(url.openStream()); byte[] buf = new byte[2048]; int n = 0; while (-1 != (n = in.read(buf))) { out.write(buf, 0, n); } out.close(); in.close(); } catch (IOException e) { return null; } return out.toByteArray(); } I have an image url and it is valid. for example. https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTxfYM-hnD-Z80tgWdIgQKchKe-MXVUfTpCw1R5KkfJlbRbgr3Zcg My problem is I don't want to download if image is really not exists.Like .... https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcTxfYM-hnD-Z80tgWdIgQKchKe-MXVUfTpCw1R5KkfJlbRbgr3Zcgaaaaabbbbdddddddddddddddddddddddddddd This image shouldn't be download by my method. So , how can I know the giving image URL is not really exists. I don't want to validate my URL (I think that may not my solution ). So, I googled for that. From this article ... How to check if a URL exists or returns 404 with Java? and Java check if file exists on remote server using its url But this con.getResponseCode() will always return status code "200". This mean my method will also download invalid image urls. So , I output my bufferStream as like... System.out.println(in.read(buf)); Invalid image URL produces "43". So , I add these lines of codes in my method. if (in.read(buf) == 43) { return null; } It is ok. But I don't think that will always satisfy. Has another way to get it ? am I right? I would really appreciate any suggestions. This problem may struct my head. Thanks for reading my question.

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• Rule of precedence == over =

  - by robUK

  Hello, I am just wondering would it be better to do this: if((fd = open(filename, O_RDWR)) == -1) { fprintf(stderr, "open [ %s ]\n", strerror(errno)); return 1; } or this fd = open(filename, O_RDWR); if(fd == -1) { fprintf(stderr, "open [ %s ]\n", strerror(errno)); return 1; } Many thanks for any suggestions,

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• Object allocation in C++

  - by Poiuyt

  char *myfunc() { char *temp = "string"; return temp; } In this piece of code, where does the allocation of the object pointed to by temp happen and what would be its scope? Is this function a valid way to return a char* pointer?

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• make select @@IDENTITY; a long?

  - by acidzombie24

  I am grabbing the last rowid and i am doing this select @@IDENTITY pk = (long)cmd.ExecuteScalar(); I get an invalid typecast bc this is int instead of long. Why doesnt this return a long? can i make it return long? Solution for now is to use pk = Convert.ToInt64(cmd.ExecuteScalar());

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• [Linq to sql] query result what should i use Count() or Any()...

  - by Pandiya Chendur

  I am checking login of a user by this repository method, public bool getLoginStatus(string emailId, string password) { var query = from r in taxidb.Registrations where (r.EmailId == emailId && r.Password==password) select r; if (query.Count() != 0) { return true; } return false; } I saw in one of the previous questions !query.Any() would be faster... Which should i use? Any suggestion....

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• SELECT DISTINCT multiple field search?

  - by Patrick

  I'm trying to search multiple fields zc_city and zc_zip for when user input and then return row results for zc_city zc_state and zc_zip $q = strtolower($_GET["q"]); if (!$q) return; $sql = "SELECT DISTINCT zc_city AS zcity FROM search_zipcodes WHERE zc_city LIKE '$q%'"; $rsd = mysql_query($sql); while($rs = mysql_fetch_array($rsd)) { $zcity = $rs['zcity']; echo "$zcity\n"; }

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• how to search a string in structure variable ( C# )

  - by deep

  public struct Items { public string Id; public string Name; } public Items[] _items = null; if (_items.Contains("Table")) { // i need to check the structure and need to return correponding id } and am having a list of variables in my structure variable... i need to search a Name in the structure(_items) and i want to return the Corresponding Id. how to do this,

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• How to add MousePressEvent?

  - by John Son

  In qt: I create a class based on QToolButton to display icon and text. How can I add 'mousePressEvent' to the class? Thank you. bool IconLabel::event (QEvent* e ) { if ( e->type() == QEvent::Paint) { return QToolButton::event(e); } return true; } The class is: class IconLabel : public QToolButton { Q_OBJECT public: explicit IconLabel(QWidget *parent = 0); bool event (QEvent* e ); signals: public slots: };

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• Why does this C++ code-snippet segmentation fault?

  - by lorb

  #include <iostream> using namespace std; int recur(int x) { 1 and recur(--x); cout << x; return x; } int main() { recur(10); return 0; }

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• what this function do please ? (java)

  - by user298146

  public static int ABC(int x, int y) { if(y==0) return(1); else return(x * ABC(x,y-1)); } what this function do please ? factorial ?

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• IO::Pipe - close(<handle>) does not set $?

  - by danboo

  My understanding is that closing the handle for an IO::Pipe object should be done with the method ($fh->close) and not the built-in (close($fh)). The other day I goofed and used the built-in out of habit on a IO::Pipe object that was opened to a command that I expected to fail. I was surprised when $? was zero, and my error checking wasn't triggered. I realized my mistake. If I use the built-in, IO:Pipe can't perform the waitpid() and can't set $?. But what I was surprised by was that perl seemed to still close the pipe without setting $? via the core. I worked up a little test script to show what I mean: use 5.012; use warnings; use IO::Pipe; say 'init pipes:'; pipes(); my $fh = IO::Pipe->reader(q(false)); say 'post open pipes:'; pipes(); say 'return: ' . $fh->close; #say 'return: ' . close($fh); say 'status: ' . $?; say q(); say 'post close pipes:'; pipes(); sub pipes { for my $fd ( glob("/proc/self/fd/*") ) { say readlink($fd) if -p $fd; } say q(); } When using the method it shows the pipe being gone after the close and $? is set as I expected: init pipes: post open pipes: pipe:[992006] return: 1 status: 256 post close pipes: And, when using the built-in it also appears to close the pipe, but does not set $?: init pipes: post open pipes: pipe:[952618] return: 1 status: 0 post close pipes: It seems odd to me that the built-in results in the pipe closure, but doesn't set $?. Can anyone help explain the discrepancy? Thanks!

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• Do these methods have same output?

  - by devrimbaris

  protected synchronized boolean isTimeoutOccured(Duration timeoutDuration) { DateTime now = new DateTime(); if (timeoutOccured == false) { if (new Duration(requestTime.getMillis(), now.getMillis()).compareTo(timeoutDuration) > 0) { timeoutOccured = true; } } return timeoutOccured; } protected boolean isTimeoutOccured2(Duration timeoutDuration) { return atomicTimeOut.compareAndSet(false, new Duration(requestTime.getMillis(), new DateTime().getMillis()).compareTo(timeoutDuration) > 0); }

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• toFixed(2) - math round ?

  - by adrien334

  Hi, I would like to find a function that will return this kind of formatted values : 1.5555 => 1.55 1.5556 => 1.56 1.5554 => 1.55 1.5651 => 1.56 toFixed() and math round return this value : 1.5651.fixedTo(2) => 1.57 This will be usefull for money rounding.

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