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  • while(0=0) evaluates to false

    - by paque
    b=10; while(a=b) { b--; if(b==-10)break; } B goes from 10 to -10. In my world, the while-statement, a=b, should always be true (since the assigment always "goes well"). That is not the case. When the loop stops, b will have a value of 0. In my world, it should pass 0 and go all the way to -10, when the if-statement kicks in. Have I misunderstood something major? (Code tested in IE8 and Adobe Acrobat)

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  • C++ Types Impossible to Name

    - by Kirakun
    While reading Wikipedia's page on decltype, I was curious about the statement, Its [decltype's] primary intended use is in generic programming, where it is often difficult, or even impossible, to name types that depend on template parameters. While I can understand the difficulty part of that statement, what is an example where there is a need to name a type that cannot be named under C++03? EDIT: My point is that since everything in C++ has a declaration of types. Why would there ever be a case where it is impossible to name a type? Furthermore, aren't trait classes designed to yield type informations? Could trait classes be an alternative to decltype?

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  • sqlite error :/* SQL error or missing database */

    - by user262325
    Hello everyone I have a project in which I stored sqlite database file "data.sqlite3" to 'Group'&files'-'resource' Below are my viewcontroller source codes //-myviewcontroller.h #import "sqlite3.h" #define kFilename @"data.sqlite3" //myviewcontroller.m -(NSString *)dataFilePath { NSArray *paths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; return [documentsDirectory stringByAppendingPathComponent:kFilename]; } -(void)f { if (sqlite3_open([[self dataFilePath] UTF8String],&database)!=SQLITE_OK) //dataFilePath returns ///Users/interdev/Library/Application Support/iPhone Simulator/User/Applications/095C6E05-4EAE-4817-883E-A72E39D439E0/Documents/data.sqlite3 { sqlite3_close(database); NSAssert(0,@"Failed to open database");//no problem } NSString *query = @"SELECT * FROM table1 ORDER BY ROW";//table1 is table name sqlite3_stmt *statement; NSInteger v=sqlite3_prepare_v2( database, [query UTF8String], -1, &statement, nil); NSString *zs= [NSString stringWithFormat:@"%d",v]; NSLog(@" The buttontitile is %@ ",zs); if ( v == SQLITE_OK) { // ... } I checked value of v in log, it always is 1 #define SQLITE_ERROR 1 /* SQL error or missing database */ I do not know why this happened.

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  • Why is selecting specified columns, and all, wrong in Oracle SQL?

    - by TomatoSandwich
    Say I have a select statement that goes.. select * from animals That gives a a query result of all the columns in the table. Now, if the 42nd column of the table animals is is_parent, and I want to return that in my results, just after gender, so I can see it more easily. But I also want all the other columns. select is_parent, * from animals This returns ORA-00936: missing expression. The same statement will work fine in Sybase, and I know that you need to add a table alias to the animals table to get it to work ( select is_parent, a.* from animals ani), but why must Oracle need a table alias to be able to work out the select?

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  • code in xmlhttp.readyState==4 doen't get executed

    - by shazia
    function download() { if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { //alert(xmlhttp.readyState); if(xmlhttp.readyState==4 && xmlhttp.status==200) { alert (xmlhttp.responseText); } } xmlhttp.open("GET","import.php?file="+document.getElementById('uploaded_file').value,false); xmlhttp.send(); // location.reload(true); } if I put alert and monitor xmlhttp.readyState then it shows me that its status does turn 4 and it does go in the if statement, if I don't monitor it with alert then it doesn't go in the if statement but I know import.php is working because I can see the changes in the database. I don't know whats going on...can anyone help. Thanks

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  • LINQ 2 SQL Insert Error

    - by Refracted Paladin
    I have the below LINQ method that I use to create the empty EmploymentPLan. After that I simply UPDATE. For some reason this works perfectly for myself but for my users they are getting the following error -- The target table 'dbo.tblEmploymentPrevocServices' of the DML statement cannot have any enabled triggers if the statement contains an OUTPUT clause without INTO clause. This application is a WinForm app that connects to a local SQL 2005 Express database. public static Guid InsertEmptyEmploymentPlan(int planID, string user) { using (var context = MatrixDataContext.Create()) { var empPlan = new tblEmploymentQuestionnaire { PlanID = planID, InsertDate = DateTime.Now, InsertUser = user, tblEmploymentJobDevelopmetService = new tblEmploymentJobDevelopmetService(), tblEmploymentPrevocService = new tblEmploymentPrevocService() }; context.tblEmploymentQuestionnaires.InsertOnSubmit(empPlan); context.SubmitChanges(); return empPlan.EmploymentQuestionnaireID; } }

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  • How to inherit from the main class in java

    - by user225269
    I have two java classes. One is NewFrame.java where the forms(buttons, textfields) are located. And the other one is Main.java where I have put the connection string for mysql: Main.java looks like this: public class Main { /** * @param args the command line arguments */ public static void main(String[] args) throws Exception { // TODO code application logic here Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/employee_record", "root", "password"); PreparedStatement statement = con.prepareStatement("select * from employee"); ResultSet result = statement.executeQuery(); } } How do I inherit from the main.java so that the declarations in it would be universally accessible to the forms in NewFrame.java? Please help. Thanks

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  • identify the input that is multiple of 11 and odd or even java

    - by Bolor Ch
    i am trying to write code to determine the nature of input using if statement only. The nature of input could be following: a multiple of 11 even or odd. For the code below, when I enter my input, it does not display the result as "input:NOT:ODD". Also how can I check multiple conditions with if statement? (else is not considered) import java.util.Scanner; public class test { public static void main( String args[] ) { Scanner input = new Scanner( System.in ); int x; int EO; int Mult; System.out.print ( "Enter value: " ); x = input.nextInt(); EO = x % 2; Mult = x % 11; if (EO > 0 && Mult > 0) { System.out.printf ("%d:NOT:ODD"); } } }

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  • C++11/14 and return( ... ) vs return

    - by user2485710
    In C++ you are allowed to write a return statement that looks like : return ( ... ); which is different from the more popular : return ... ; In particular the first version returns the address/reference of something that is local to the stack of the function which contains that return statement. Now why something would like to return a reference to something that, at that point, has no lifetime ? What are the use case for this idiom ? Considering the new buzzword and features from C++11 and C++14 there is a different usage for this ?

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  • Grouping date periods (by number of days) but exclude the weekends?

    - by tonyyeb
    I have a table with start and end dates in. My goal is to have a table that has grouped these dates into how many days the period spans. I thought I had the solution with a simple SQL statement (MS SQL Server 2005) but I want to exclude weekends. SELECT DATEDIFF(D, StartDate, EndDate)+1 AS Days, COUNT(ID) as Count FROM myDateTable GROUP BY DATEDIFF(D, StartDate, EndDate) This gives a record set of: Days Count 1 4 2 2 4 1 7 2 Is this possible to exclude the weekends in the SQL statement and if not can it be done using ASP and a array perhaps?

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  • PHP - not sure how to ask - regarding variables and $_POST

    - by Phil
    I have a PHP form. The form works but I'm trying to test to see if a value other than the first item has been selected. I can't figure out how to write the If statement. $products = array( '' => 1, 'Item 2' => 2, 'Item 3' => 3, 'Item 4' => 4, 'Item 5' => 5, 'Item 6' => 6 ); $html = generateSelect('products', $products); function generateSelect($name = '', $options = array()) { $html = '<select name="'.$name.'">'; foreach ($options as $option => $value) { $html .= '<option value='.$value.'>'.$option.'</option>'; } $html .= '</select>'; return $html; } In my table, the drop down box is displayed: <tr> <td style="width:{$left_col_width}; text-align:left; vertical-align:center; padding:{$cell_padding}; font-weight:bold; {$product[3]}">{$product[0]}</td> <td style="text-align:left; vertical-align:top; padding:{$cell_padding};"><select name="{$product[1]}"> <option value="1"></option> <option value="2">Item 2</option> <option value="3">Item 3</option> <option value="4">Item 4</option> <option value="5">Item 5</option> <option value="6">Item 6</option> </select></td> </tr> I use the following if statement to check to see if someone has entered a phone number. if they have not entered a phone number, then the "Phone:" text turns red. How do I do an if statement similar to this to verify that someone has selected a product option from the drop down box? if(!empty($_POST['phone'])) { $phone[2] = clean_var($_POST['phone']); if (function_exists('htmlspecialchars')) $phone[2] = htmlspecialchars($phone[2], ENT_QUOTES); } else { $error = 1; $phone[3] = 'color:#d20128;'; } it seems simple but I can't figure it out.

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  • Aborted core dumped C++

    - by avd
    I have a large C++ function which uses OpenCV library and running on Windows with cygwin g++ compiler. At the end it gives Aborted(core dumped) but the function runs completely before that. I have also tried to put the print statement in the end of the function. That also gets printed. So I think there is no logical bug in code which will generate the fault. Please explain. I am also using assert statements.But the aborted error is not due to assert statement. It does not say that assertion failed. It comes at end only without any message. Also the file is a part of a large project so I cannot post the code also.

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  • A better understanding of the relations beetween database tables

    - by Nistor Alexandru
    Hi I am trying to get a better understanding of relational databases and there is something that I keep bumping into and don't understand.Let's take this two tables: In this case Login.ID is the primary key with auto_increment set and Profile.ID_LOGIN is the Foreign KEY.When a user is created and it's username and password is stored in the login database does the ID coresponding to the curesnt username and password get automaticly added into ID_LOGIN or do I have to create an SQL statement to do this? If I have to create a SQL statement how should I aproach adding the ID_LOGIN to make sure I am adding it corectly?

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  • Is there any difference between SQL running in code vs the MySQL command line?

    - by MJB
    I have a SQL update statement I am running from inside a PHP program. It is prepared and then executed. When I run it in PHP, it reports a constraint violation. When I run the exact same statement from the command line (which I am getting via dBug()), it works with no errors. This sounds impossible, so I keep looking for differences between the statements. The only thing I can see is that when I execute it with an array of arguments, they all appear to be chars, when some should be integers. Any suggestions for where to look? I can post the code, but that does not seem like it would be helpful, because the code works.

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  • Is it possible for a Grails Domain to have no 'id'?

    - by firnnauriel
    Is it possible to create a table that has no 'id'? For example, this is my domain: class SnbrActVector { int nid String term double weight static mapping = { version false id generator: 'identity' } static constraints = { } } When I run this SQL statement, it fails: insert into snbr_act_vector values (5, 'term', 0.5) I checked the table and 'id' is already set to autoincrement. I'm thinking that another option is to remove the 'id' itself. Or is there another workaround for this? Please assume that it is not an option to change the givent SQL statement.

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  • Accessing hard-coded data in a C# application.

    - by haymansfield
    I'm trying to avaid hardcoding in a .net 2.0 soon to be 3.5 application. I have a large enumneration which I wish to map 1 to 1 to a set of strings. Each enumerated value will also map to 1 of 2 values indicating an action. The existing code does this with a big switch statement but this seems ugly to me. Is there a better way of storing and accessing the data? I've thought about resx files but when you consider that the designer file contains just as many hardcoded values it seems a little pointless. Is embedding an xml file in the assembly a good idea? Is a big switch statement not as bad as it seems? Is there a better solution?

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  • AJAX in ASP.NET - How do I check a checkbox and have the action reflected in the database?

    - by hamlin11
    This is about as beginner as it gets regarding AJAX, but here it goes. I want to have one checkbox somewhere on an ASP.NET web form (ASPX). When the user clicks the checkbox, I want one of those spinning indicators to show. While that spinning indicator is showing, I want an update operation to occur in the database to reflect that the user has intended for that checkbox to be checked. update MyTable set CheckboxChecked = 1 Then, as soon as the update operation has occurred, I want that to be reflected in the checkbox by removing the spinning indicator and replacing it with the standard checked checkbox. I'm guessing this is done with an UpdatePanel and possibly an update statement followed by a looped call to a select statement... but I have never used AJAX before and have no idea how to go about it. Thanks!

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  • How do you DELETE rows in a mysql table that have a field IN the results of another query?

    - by user354825
    here's what the statement looks like: DELETE FROM videoswatched vw2 WHERE vw2.userID IN ( SELECT vw.userID FROM videoswatched vw JOIN users u ON vw.userID=u.userID WHERE u.companyID = 1000 GROUP BY userID ) that looks decent to me, and the SELECT statement works on its own (producing rows with a single column 'userID'. basically, i want to delete entries in the 'videoswatched' table where the userID in the videoswatched entry, after joining to the users table, is found to have companyID=1000. how can i do this without getting the error in my sql syntax? it says the error is near: vw2 WHERE vw2.userID IN ( SELECT vw.userID FROM videoswatched vw JOIN users u and on line 1. thanks!

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  • Rails botches the SQL on a complex save

    - by Dan B
    Hi, I am doing something seemingly pretty easy, but Rails is messing up the SQL. I could just execute my own SQL, but the framework should be able to handle this. Here is the save I am trying to perform: w = WhipSenVote.find(:first, :conditions => ["whip_bill_id = ? AND whip_sen_id = ?", bill_id, k]) w.votes_no = w.votes_no - 1 w.save My generated SQL looks like this: SELECT * FROM "whip_sen_votes" WHERE (whip_bill_id = E'1' AND whip_sen_id = 7) LIMIT 1 And then: UPDATE "whip_sen_votes" SET "votes_yes" = 14, "updated_at" = '2009-11-13 19:55:54.807000' WHERE "id" = 15 The first select statement is correct, but as you can see, the Update SQL statement is pretty wrong, though the votes_yes value is correct. Any ideas? Thanks!

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  • java switch case question

    - by hkvega
    public String sizeOfSupermarket() { String size; switch (this.numberOfProducts) { case (this.numberOfProducts > 5000): size = "Large"; break; case (this.numberOfProducts > 2000 && this.numberOfProducts < 5000): size = "Medium"; break; case (this.numberOfProducts < 2000): size = "Small"; break; } return size; } the above is wrong, how to write the compare statement in case statement?

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  • SQL query not working

    - by Ziv
    hi, I'm trying to create a query in an access database for a C# dataset using the query editor but the created method says there is a problem and isn't created correctly. SELECT Discs.* FROM Discs WHERE (Title=@Title OR @Title IS NULL) AND (Type=@Type OR @Type IS NULL) AND (ContainerID=@ContainerID OR @ContainerID IS NULL) AND NOT (@Title IS NULL AND @Type IS NULL AND @ContainerID IS NULL) the error is: Generated SELECT statement. Error in WHERE clause near '@'. Unable to parse query text. the generated select method doesn't have any parameters and is unusable. I've tried the exact same SQL statement in the access query and it worked flawlessly, what am I supposed to be doing differently when transferring it to C#?

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  • C# Console Application - Odd behaviour - char '\a'

    - by KHT
    After extensive debugging of an application, I noticed the console window would hang when searching text for the char '\a'. The goal is to strip out characters from a file. The console window would always hang upon exiting the program, and it would make it to the last statement of main. I removed the '\a' from the switch statement and the console application does not hang anymore. Any idea why? I still need to strip out the char '\a', but cannot get the application to work without hanging. switch (c) { case '\t': //Horizontal Tab case '\v': //Vertical Tab case '\n': //Newline case '\f': //Form feed case '\r': //carriage return case '\b': //Backspace case '\x7f': //delete character case '\x99': //TM Trademark case '\a': //Bell Alert **REMOVED THIS** return true; }

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