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  • SQL CASE WHEN NULL - question

    - by cc0
    Ok, so I'm trying to select an amount of rows from a column that holds the value 3, but only if there are no rows containing 10 or 4, if there are rows containing 10 or 4 I only want to show those. What would be a good syntax to do that? So far I've been attempting a CASE WHEN statement, but I can't seem to figure it out. Any help would be greatly appreciated. (My database is in an MS SQL 2008 server)

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  • Django + Ajax

    - by Joe
    So, I am just starting to use jQuery with one of my Django projects, but I have a pretty noobie question. In a django view you have to return an HttpResponse object from the view, but sometimes I don't need to return anything. For instance, I might just be updating the database via ajax and don't need to send anything back. So my question is, what do you do in that situation? Thanks

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  • File transfer through SQL Server connection

    - by wasim
    I have a text file sitting on client machine and want to move it to the database server (MS SQL 2008) but I don't have any access to the server except through the SQL Server client. Can I transfer this file to the server using SQL client connection?

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  • Java: Making concurrent MySQL queries from multiple clients synchronised

    - by Misha Gale
    I work at a gaming cybercafe, and we've got a system here (smartlaunch) which keeps track of game licenses. I've written a program which interfaces with this system (actually, with it's backend MySQL database). The program is meant to be run on a client PC and (1) query the database to select an unused license from the pool available, then (2) mark this license as in use by the client PC. The problem is, I've got a concurrency bug. The program is meant to be launched simultaneously on multiple machines, and when this happens, some machines often try and acquire the same license. I think that this is because steps (1) and (2) are not synchronised, i.e. one program determines that license #5 is available and selects it, but before it can mark #5 as in use another copy of the program on another PC tries to grab that same license. I've tried to solve this problem by using transactions and table locking, but it doesn't seem to make any difference - Am I doing this right? Here follows the code in question: public LicenseKey Acquire() throws SmartLaunchException, SQLException { Connection conn = SmartLaunchDB.getConnection(); int PCID = SmartLaunchDB.getCurrentPCID(); conn.createStatement().execute("LOCK TABLE `licensekeys` WRITE"); String sql = "SELECT * FROM `licensekeys` WHERE `InUseByPC` = 0 AND LicenseSetupID = ? ORDER BY `ID` DESC LIMIT 1"; PreparedStatement statement = conn.prepareStatement(sql); statement.setInt(1, this.id); ResultSet results = statement.executeQuery(); if (results.next()) { int licenseID = results.getInt("ID"); sql = "UPDATE `licensekeys` SET `InUseByPC` = ? WHERE `ID` = ?"; statement = conn.prepareStatement(sql); statement.setInt(1, PCID); statement.setInt(2, licenseID); statement.executeUpdate(); statement.close(); conn.commit(); conn.createStatement().execute("UNLOCK TABLES"); return new LicenseKey(results.getInt("ID"), this, results.getString("LicenseKey"), results.getInt("LicenseKeyType")); } else { throw new SmartLaunchException("All licenses of type " + this.name + "are in use"); } }

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  • core data and paging

    - by Joo Park
    I have a database of 50,000 records. I'm using core data to fetch records from a search. A search could return 1000 records easily. What is needed to page through these records using core data and uitableview? I would like to show 100 records at a time and have 'load more' button after viewing 100 records.

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  • Date difference in minutes

    - by zurna
    I have DateFirstStarted and DateEnded fields in the database. Date values are recorded as DateFirstStarted 04/13/2010 07:00:00.000 PM DateEnded 04/13/2010 09:00:00.000 PM How do I print minute difference between two dates. I tried the following code but it returned something like 999343 Clock = DateDiff("m", objLiveCommentary("DateFirstStarted"), objLiveCommentary("DateEnded"))

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  • Redirecting to another controller in Rails

    - by Vitaly
    Hi, I'm trying to redirect from one controller to another in Rails and I am getting this error: undefined method `call' for nil:NilClass The code is pretty simple (in def create method): @blog_post_comment = BlogPostComment.new(params[:blog_post_comment]) respond_to do |format| if @blog_post_comment.save flash[:notice] = 'Comment was successfully created.' redirect_to(@blog_post_comment.blog_post) else render :action => "new" end end Save goes ok, the value gets into the database. How can I work around the redirect fail?

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  • sql "Group By" and "Having"

    - by Hans Rudel
    im trying to work through some questions and im not sure how to do the following Q:Find the hard drive sizes that are equal among two or more PCs. its q15 on this site http://www.sql-ex.ru/learn_exercises.php#answer_ref The database scheme consists of four tables: Product(maker, model, type) PC(code, model, speed, ram, hd, cd, price) Laptop(code, model, speed, ram, hd, screen, price) Printer(code, model, color, type, price) any pointers would be appreciated.

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  • how to store a 2D game world in mysql

    - by monthon1
    I am making a 2D game in javascript/ajax, that will be using data stored in mysql database. Every user have got his own "area" made of small squares that can have some values. But I have no idea, how to store values of each square in mysql, when each user can have area with different width or height. Do you have some idea?

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  • are push notification tokens unique across all apps for a single device?

    - by scootklein
    i will have multiple applications on the app store and 1 urban airship account to send push notifications to all of these devices. what i want to know is if each apple device has the same "push token" across all applications? this is more of a database architecture thing so that I don't duplicate a push token many times if one single device uses many of my apps if each apple device generates a unique push token for each application it has installed my architecture needs to change.

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  • php mysql timestamp

    - by user342391
    I need to track the date and time a user was created in my mysql database. I have column called 'created' and the data type as TIMESTAMP. The problem is that when a user changes their password or other information the TIMESTAMP value changes. How can I set this to not change????

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  • Cannot resolve the collation conflict ???

    - by HAJJAJ
    hi guys I had this error and i don't know how to fix it Message=Cannot resolve the collation conflict between "Arabic_CI_AS" and "SQL_Latin1_General_CP1_CI_AS" in the equal to operation. note: I already change the collation from the database option -- Collation i change it from "Arabic_CI_AS" to "SQL_Latin1_General_CP1_CI_AS" and i am still getting the same error !! any suggestion to solve this ?

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  • Oracle -Character Encoding

    - by user314250
    I am facing a peculiar problem where i need to update a particular value in database to say 'Hellò'. When i run normal update statement the values are updated fine. But when i put it i a .sql script file and then run the update statement the last character gets replaced by a junk value. Can some one enlighten me on this and how oracle processes script files?

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  • launching iphone app in itunes store help

    - by Adusum
    Hi, I developed an iPhone app using UITablesView and database in the background. I want to know furthur step for it like after completing the app development how to proceed furthur for launching it in itunes store. Can anyone help me in detail about it. Thanks,

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  • WordPress - moving from one host to another

    - by Maor
    I am trying to move a WordPress installation from one server to another one, including all of the SQL data, and the file-system data (photos,template files). I just have a problem changing the URLs in the database, since I need to replace the new URL with the old one. I would love to have some suggestions about how can I replace the URLs (maybe there's a rplace statement in SQL?) Thanks in advance.

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  • Programmatically import CSV data to Access

    - by FrustratedWithFormsDesigner
    I have an Access database and the source of data comes from generated CSV files. I'd like to have an easy way for the users to simply select the data file and import it. Import should append the existing data to the data already in the data table. Is there a way in Access to create a file selector and import using saved CSV import settings that are already in the file?

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  • Remote XP -> Win98 WMI Connection

    - by Logan Young
    I've asked this on Technet, but because Win98 is no longer supported, I can't get any decent information, I was hoping there might be some "old school" developers here who might be able to help me. There is an application that we use a lot at work. This application should run 8am-5pm with as little interruption as possible. Most of the computers where this application runs are using Win98, and we have no way to upgrade them because we can't buy new hardware at the moment. My computer is running WinXP, so I thought of a way to make sure that this application runs all the time: The idea I had was to develop a Windows Service that executes a VBScript file that contains a WMI query to get a list of processes from each computer. Each list is then examined, and, depending on whether or not the target application is running, it will either do nothing, or it will execute another VBScript file that contains a WMI query that will be used to start the target application remotely. I later found a way to do this all with 1 VBScript file (see code below) My problem is in the remote connection to the target computers. I've installed WMI Core 1.5 on them, but every time I try the remote connection, I get the following: The remote server is unavailable or does not exist: 'GetObject' VBScript runtime error 800A01CE I've done some research, and all I've found is info about DCOM Config and Windows Firewall, but Win98 doesn't have either of these. ' #### Variables and constants #### Const HIDDEN_WINDOW = 12 Dim T ' #### End Variables and constants #### Main() Sub Main() ' #### Get Process information from WMI Computer = "." Set WMI = GetObject("winmgmts:" & _ "{ImpersonationLevel=Impersonate}!\\" & Computer & "\root\cimv2") Set Settings = WMI.ExecQuery("SELECT * FROM Win32_Process") For Each Process In Settings ' #### If the application is found to be running, set a value to indicate this If Process.Name = "NOTEPAD.EXE" Then T = True End If Next ' #### T will only have a value if the application is not running. We therefore ' #### evaluate it to determine if it has a value or not. If not, start the application If Not T Then 'MsgBox("Application not found.") Set Startup = WMI.Get("Win32_ProcessStartup") Set Config = Startup.SpawnInstance_ Config.ShowWindow = HIDDEN_WINDOW Set Process = GetObject("winmgmts:root\cimv2:Win32_Process") errReturn = Process.Create(_ "C:\Windows\notepad.exe", null, Config, intProcessID) End If End Sub This uses WMI to get the list of processes from the local computer and, if the target application is running, it'll do nothing, otherwise it'll forcefully start the target application. The problem is that this works only if I specify the local comuter, if I target another computer, I get the error mentioned above. Does anyone have any ideas? Thanks in advance for the help!

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  • MySQL 5.1.41 leading zero is deleted

    - by iggnition
    Hello, I have a MySQL database where i want to store phonenumbers among other things. The fieldtype is INT(10) When I try to insert a number starting with a 0, like 0504042858 it's stored like 504042858. This only happens with zeros when the number start with any other number it's stored correctly. What am I doing wrong?

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  • Where should I keep my log files?

    - by ripper234
    We keep most of our logs in a dedicated database table. We have written custom appenders for log4j and log4net, have a fixed log schema with lots of handy columns, and are quite happy with it. Is that the "best practice" (for sites smaller in scale than Facebook, where a simple DB table just won't scale)?

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  • Define Rails Model Persistent Attributes in Model File

    - by Kevin Sylvestre
    I recently played with MongoDB in Rails using Mongoid. I like the ability to define attributes for models within the model file (as opposed to in migrations): class Person include Mongoid::Document field :name, :type => String field :birthday, :type => Date end For projects that cannot use a schema-less database, does a similar feature exist? Any gems or plugins that generate schemas from a similar syntax would be greatly appreciated. Thanks.

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