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• Hashes vs Numeric id's

  - by Karan Bhangui

  When creating a web application that some how displays the display of a unique identifier for a recurring entity (videos on YouTube, or book section on a site like mine), would it be better to use a uniform length identifier like a hash or the unique key of the item in the database (1, 2, 3, etc). Besides revealing a little, what I think is immaterial, information about the internals of your app, why would using a hash be better than just using the unique id? In short: Which is better to use as a publicly displayed unique identifier - a hash value, or a unique key from the database? Edit: I'm opening up this question again because Dmitriy brought up the good point of not tying down the naming to db specific property. Will this sort of tie down prevent me from optimizing/normalizing the database in the future? The platform uses php/python with ISAM /w MySQL.

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• Custom Sorting on Custom Field in Django

  - by RotaJota

  In my app, I have defined a custom field to represent a physical quantity using the quantities package. class AmountField(models.CharField): def __init__(self, *args, **kwargs): ... def to_python(self, value): create_quantities_value(value) Essentially the way it works is it extends CharField to store the value as a string in the database "12 min" and represents it as a quantities object when using the field in a model array(12) * min Then in a model it is used as such: class MyModel(models.Model): group = models.CharField() amount = AmountField() class Meta: ordering = ['group', 'amount'] My issue is that these fields do not seem to sort by the quantity, but instead by the string. So if I have some objects that contain something like {"group":"A", "amount":"12 min"} {"group":"A", "amount":"20 min"} {"group":"A", "amount":"2 min"} {"group":"B", "amount":"20 min"} {"group":"B", "amount":"1 hr"} they end up sorted something like this: >>> MyModel.objects.all() [{A, 12 min}, {A, 2 min}, {A, 20 min}, {B, 1 hr}, {B, 20 min}] essentially alphabetical order. Can I give my custom AmountField a comparison function so that it will compare by the python value instead of the DB value?

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• Connect rails application to MsSQL 2005 from Windows

  - by Enrico Carlesso

  Hi guys. I (sadly) have to deploy a rails application on Windows XP which has to connect to Microsoft SQL Server 2005. Surfing in the web there are a lot of hits for connect from Linux to MsSQL, but cannot find out how to do it from Windows. Basically I followed these steps: Install dbi gem Install activerecord-sql-server-adapter gem My database.yml now looks like this: development: adapter: sqlserver mode: odbc dsn: test_dj host: HOSTNAME\SQLEXPRESS database: test_dj username: guest password: guest But I'm unable to connect it. When I run rake db:migrate I get IM002 (0) [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified I'm not a Windows user, so cannot understand really well the meaning of dsn element or so. Does someone have an idea how to solve this? Thanks in advance

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• Converting a large SQL Server Database to Azure Storage

  - by Laith

  Hi guys, I have a very large database structure, (Data is not important at this point, I can migrate the info in the db pretty easily if the structure is done) , all reside in SQL Server and I even published it to SQL Azure, but thinking about the limitation of SQL Azure in size, made me decide to switch most of the tables that do not need all the bells and whistles of SQL Azure to Azure Table and blob storage. I was thinking of creating a TT template that dose that, but was wondering if their is a tool that do that. Any ideas or thoughts. The only tables that i would keep in SQL Azure would anything related to transactions like payments. Appreciate your thoughts and advice

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• PDO and SQL IN statements

  - by Sai

  Im using a sequel for search like this using PDOs $states = "'SC','SD'"; $sql = "select * from mytable where states in (:states)"; $params = array(':states'=>$states); and I use my function $result = $this->selectArrayAssoc($sql, $params); where my selectArrayAssoc function as following public function selectArrayAssoc($sql, $params = array()){ try{ $sth = $this->db->prepare($sql); $sth->execute($params); $result = $sth->setFetchMode(PDO::FETCH_ASSOC); return $sth->fetchAll(); }catch(PDOException $e){ print $e->getMessage(); //Log this to a file later when in production exit; } } it does not take the quoted variables, I think it is suppressing, in such cases how to deal with this.

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• Create automatically table that is composed by its primery key and 2 other foreign keys

  - by user210481

  I have table A with a primary id, a table B with a primary key id also and another table C with a primary key id and rows Aid and Bid where Aid and Bid are foreign keys of C and the primary keys of A and B respectively. One way of populating these DB would be populating table A, table B and table C separately. I would like to know if there is a more clever way of doing it, where I could populate A first and at the same time I populate B, I can indicate that an entry in C should be also created. Any idea and suggestion on how to populate them is welcome. I'm trying to take advantage of the foreign keys structure Thanks

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• Localization — how to check that Filename1 and Filename2 are the same

  - by modosansreves

  I want to know that Filename1, provided by the user is the same as stored in DB (Filename2). I was about to use string.Equals(Filename1, Filename2, StringComparison.CurrentCultureIgnoreCase) but then I doubted whether I should use StringComparison.InvariantCultureIgnoreCase. Obviously, I need to do this the same way OS does, or use appropriate API. In some cultures, AFAIK, characters (e.g. vocals) may change if the next one is Capitalized. As I primarily target English-speaking market, I'd like my software to work well throughout the world.

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• ASP.NET EnqityDataSource WhereParameters, creates new property.

  - by Alex

  I am trying to populate GridView, using EntityDataSource(code behind), I need to able to sort GridView. However when I sort i get error: A property with name 'aspnet_Users.UserId1' does not exist in metadata for entity type So I beleive it is because I generate where parameter in code behind: ActiveEnqDataSource.WhereParameters.Add(new SessionParameter("aspnet_Users.UserId", TypeCode.Object, "UserName")); Full code is : ActiveEnqDataSource.ConnectionString = db.Connection.ConnectionString; ActiveEnqDataSource.DefaultContainerName = "Entities"; ActiveEnqDataSource.EntitySetName = "Enquiries"; ActiveEnqDataSource.Include = "UserCars.CarModel.CarMake, Category, aspnet_Users"; ActiveEnqDataSource.EnableUpdate = true; ActiveEnqDataSource.EnableInsert = true; ActiveEnqDataSource.EnableDelete = true; ActiveEnqDataSource.AutoGenerateWhereClause = true; ActiveEnqDataSource.WhereParameters.Add(new SessionParameter("aspnet_Users.UserId", TypeCode.Object, "UserName")); Any suggestions? Thank you very much! The gridview itself renders perfectly, only thing I cannot sort it, any "whereParameters" I add, Add 1 to the property e.g UserId1,EnquiryStatus1, ProdauctName1. etc...

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• Performance analysis strategies

  - by Bernd

  I am assigned to a performance-tuning-debugging-troubleshooting task. Scenario: a multi-application environment running on several networked machines using databases. OS is Unix, DB is Oracle. Business logic is implemented across applications using synchronous/asynchronous communication. Applications are multi-user with several hundred call center users at peak time. User interfaces are web-based. Applications are third party, I can get access to developers and source code. I only have the production system and a functional test environment, no load test environment. Problem: bad performance! I need fast results. Management is going crazy. I got symptom examples like these: user interface actions taking minutes to complete. Seaching for a customer usually takes 6 seconds but an immediate subsequent search with same parameters may take 6 minutes. What would be your strategy for finding root causes?

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• Millions of anonymous ASP.Net profiles!?

  - by Mantorok

  Hi all, some advice needed! Our website receives approximately 50,000 hits a day, and we use anonymous ASP.Net membership profiles/users, this is resulting in millions (4.5m currently) of "active" profiles and the database is 'crawling', we have a nightly task that cleans up all the inactive ones. There is no way that we have 4.5m unique visitors (our county population is only 1/2 million), could this be caused by crawlers and spiders? Also, if we have to live with this huge number of profiles is there anyway of optimising the DB? Thanks Kev

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• How to scale MySQL with multiple machines?

  - by erotsppa

  I have a web app running LAMP. We recently have an increase in load and is now looking at solutions to scale. Scaling apache is pretty easy we are just going to have multiple multiple machines hosting it and round robin the incoming traffic. However, each instance of apache will talk with MySQL and eventually MySQL will be overloaded. How to scale MySQL across multiple machines in this setup? I have already looked at this but specifically we need the updates from the DB available immediately so I don't think replication is a good strategy here? Also hopefully this can be done with minimal code change. PS. We have around a 1:1 read-write ratio.

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• C# parsing txt files IF name format is desired format

  - by jakesankey

  OK, I have txt files that I am parsing and saving into a sql db. The names are formatted like R306025COMP_272A4075_20090929_080159.txt However, there are a select few (out of thousands of files) with names that are formatted differently (particularly files that were generated as tests), example R306025COMP_SU2_TestBottom_20090915_101441.txt The reason this causes a problem for me is that I am using Split('_')[1,2,etc] to extract the R number, the 272A4075 portion, and the 20090929 (date) portion. When the application comes across the oddly named files, it fails because it is trying to parse 'TestBottom' as a date and inserts 'SU2' instead of the 272 number. Basically I want the app to recognize that if the file's name is not formatted like my first example, skip it. Any advice?

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• Sharepoint Foundation 2010 development single machine installation problems

  - by Robert Koritnik

  I'm having problems installing development machine for Sharepoint (Foundation) 2010. This is what I did so far on the same machine: Installed a clean Windows 7 x64 with 4GB of RAM without being part of any domain. Just a simple standalone machine. Enabled IIS related features as described here except IIS6 related ones (two of them) Installed SQL Server 2008 R2 Development Edition (DB Engine and Writer being enabled but not SQL Agent) Installed Visual Studio 2010 Premium Started installing Sharepoint Foundation 2010 with first extracting files, changing config to enable Windows 7 installation and then installed it as Server Farm (then Complete) to avoid installing SQL Express. Created a separate SPF_CONFIG local user with Logon on as a service right. Opened SPF Management Shell and run New-SPConfigurationDatabase so I am able to use a non-domain username (SPF_CONFIG that I created in the previous step) But all I get is this: The outcome after this error is: Database Sharepoint2010Config is created User SPF_CONFIG is added to SQL Server and attached to this newly created database as dbowner and checking SQL server security logins this user has following rights: dbcreator securityadmin public

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• JPA Cascading Delete: Setting child FK to NULL on a NOT NULL column

  - by JBristow

  I have two tables: t_promo_program and t_promo_program_param. They are represented by the following JPA entities: @Entity @Table(name = "t_promo_program") public class PromoProgram { @Id @Column(name = "promo_program_id") private Long id; @OneToMany(cascade = {CascadeType.REMOVE}) @JoinColumn(name = "promo_program_id") private List<PromoProgramParam> params; } @Entity @Table(name = "t_promo_program_param") public class PromoProgramParam { @Id @Column(name = "promo_program_param_id") private Long id; //@NotNull // This is a Hibernate annotation so that my test db gets created with the NOT NULL attribute, I'm not married to this annotation. @ManyToOne @JoinColumn(name = "PROMO_PROGRAM_ID", referencedColumnName = "promo_program_id") private PromoProgram promoProgram; } When I delete a PromoProgram, Hibernate hits my database with: update T_PROMO_PROGRAM_PARAM set promo_program_id=null where promo_program_id=? delete from t_promo_program where promo_program_id=? and last_change=? I'm at a loss for where to start looking for the source of the problem.

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• WPF Data virtualizing ListView

  - by Robert Jeppesen

  In our current WinForms app, we are displaying millions of records in ListView, using virtualization. Rows are loaded from DB as they are requested. This works well, with good performance. This is a showstopper for migrating to WPF for us. We need data virtualization in a ListView, like WinForms 2.0 has. Do you know a decent third-party control, or a relatively easy way of doing it with built-in controls? It doesn't need to be a DataGrid, a simple ListView will suffice. Note, I'm note talking about UI virtualization, it's data virtualization.

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• SQL to retrieve the latest records, grouping by unique foreign keys

  - by jbox

  I'm creating query to retrieve the latest posts in a forum using a SQL DB. I've got a table called "Post". Each post has a foreign key relation to a "Thread" and a "User" as well as a creation date. The trick is I don't want to show two posts by the same user or two posts in the same thread. Is it possible to create a query that contains all this logic? # Grab the last 10 posts. SELECT id, user_id, thread_id FROM posts ORDER BY created_at DESC LIMIT 10; # Grab the last 10 posts, max one post per user SELECT id, user_id, thread_id FROM post GROUP BY user_id ORDER BY date DESC LIMIT 10; # Grab the last 10 posts, max one post per user, max one post per thread???

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• how to access webservice from one project to another project

  - by prince23

  hi, i have an project with name called(dbservice layer) which is in path: d:\webservice\DBService. here i have an webservice which connects to DB and returns an object of an class. once i added an reference here i get an url:http://localhost:2371/Jobs.svc now i have another project name (UILayer) whic is in path: E:\School\UILayer i added an service reference here with url as http://localhost:2371/Jobs.svc but i get an messgae telling service is unable why is that happening. if both my webserivce layer and ui layer are in same project. then i able to use the webserive in the ui layer. and get the required output so i wanted to know is there any way we can acesss the webserive from one project to another project thanks in advance prince

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• Rails: Cannot add :precision or :scale options with change_column in a migration?

  - by Josh Pinter

  This seems to have been asked before: http://stackoverflow.com/questions/1402547/rails-decimal-precision-and-scale But when running a change_column migration for :precision or :scale they don't actually affect the schema or database, but db:migrate runs without errors. My migration file looks like this: class ChangePrecisionAndScaleOfPaybackPeriodInTags < ActiveRecord::Migration def self.up change_column :tags, :payback_period, :decimal, { :scale => 3, :precision => 10 } end def self.down change_column :tags, :payback_period, :decimal end end But my schema (and the data) remains as: t.decimal "rate" # previous column t.decimal "payback_period" t.string "component_type" # next column Anybody else have this issue? Thanks, Josh

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• Jquery Fast image switching

  - by echedey lorenzo

  Hi, I have a php class that generates a map image depending on my db data. It is periodically updated thru a serInterval loop. I am trying to update it with no flickering but I just can't. I've tried different methods (preloader, imageswitcher) with no success. //first load function map() { $("#map").html("<img src=map.php?randval="+Math.random()+">"); } //update it from setInterval calls function updatemap() { $("#map").fadeOut(function() { $(this).load(function() { $(this).fadeIn(); }); $(this).attr("src", "map.php?randval="+Math.random()); }) } Is there any way to update the image with no flickering at all? I would prefer an inmediate swap insteado of a fade. The problem I'm having is that after calling updatemap() the image just dissapears. ¿Maybe it is a problem with the attribute src I am parsing? THanks for your help.

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• IA-32: Pushing a byte onto a stack isn't possible on Pentium, why?

  - by Tim Green

  Hi, I've come to learn that you cannot push a byte directly onto the Intel Pentium's stack, can anyone explain this to me please? The reason that I've been given is because the esp register is word-addressable (or, that is the assumption in our model) and it must be an "even address". I would have assumed decrementing the value of some 32-bit binary number wouldn't mess with the alignment of the register, but apparently I don't understand enough. I have tried some NASM tests and come up that if I declare a variable (bite db 123) and push it on to the stack, esp is decremented by 4 (indicating that it pushed 32-bits?). But, "push byte bite" (sorry for my choice of variable names) will result in a kind error: test.asm:10: error: Unsupported non-32-bit ELF relocation Any words of wisdom would be greatly appreciated during this troubled time. I am first year undergraduate so sorry for my naivety in any of this. Tim

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• WPF: "Items collection must be empty before using ItemsSource."

  - by Zack Peterson

  I'm trying to get images to display in a WPF ListView styled like a WrapPanel as described in this old ATC Avalon Team article: How to Create a Custom View. When I try to populate the ListView with a LINQ-to-Entities queried collection of ADO.NET Entity Framework objects I get the following exception: Exception Items collection must be empty before using ItemsSource. My code… Visual Basic Private Sub Window1_Loaded(...) Handles MyBase.Loaded ListViewImages.ItemsSource = From g In db.Graphic _ Order By g.DateAdded Ascending _ Select g End Sub XAML <ListView Name="ListViewImages" SelectionMode="Single" ItemsSource="{Binding}"> <local:ImageView /> </ListView> I put a breakpoint on that line. ListViewImages.ItemsSource is Nothing just before the LINQ assignment.

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• SQL Server - Schema/Code Analysis Rules - What would your rules include?

  - by Randy Minder

  We're using Visual Studio Database Edition (DBPro) to manage our schema. This is a great tool that, among the many things it can do, can analyse our schema and T-SQL code based on rules (much like what FxCop does with C# code), and flag certain things as warnings and errors. Some example rules might be that every table must have a primary key, no underscore's in column names, every stored procedure must have comments etc. The number of rules built into DBPro is fairly small, and a bit odd. Fortunately DBPro has an API that allows the developer to create their own. I'm curious as to the types of rules you and your DB team would create (both schema rules and T-SQL rules). Looking at some of your rules might help us decide what we should consider. Thanks - Randy

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• Personal project in Java

  - by Chuck

  My first project in java is going to be a program (eventually I have to create a GUI interface but for now CLI would do) to keep track of my books (something similar to what libraries have only a simpler). I need to be able to insert, update, remove, show all books, update, search(by name or author or date). For the design I was thinking one main class Library which will have all of the above as methods that connect to the db and retrieve the data. Is this approach ok? I realize it's simple but it's my first real project and I would appreciate a little feedback. Also, is it too soon to consider reading up on design patterns and database design ?

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• Best way to optimize queries like this in Django

  - by chris

  I am trying to lower the amount of queries that my django app is using, but I am a little confused on how to do it. I would like to get a query set with one hit to the database and then filter items from that set. I have tried a couple of things, but I always get queries for each set. let's say I want to get all names from my DB, but also separate out the people just named Ted. Both the names and the ted set will be used in the template. This will give me two sets, one with all names and one with Ted.. but also hits the database twice: namelist = People.objects.all() tedList = namelist.filter(name='ted') Is there a way to filter the first set without hitting the data base again?

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• Cannot Delete a SQL job.

  - by Mustafa Kapasi

  Hi, I have disabled log shipping on a SQL 2005 database and deleted the log shipping DB on the secondary server. However i cannot delete the LSRestore_DB___ job, either by T-SQL (sp_delete_log_shipping_primary_secondary, sp_delete_job) or using the management studio on the secondary server. It just wont go. The query keeps on executing for a good 7 hours. Tried disabling, still doesn't delete. Restarted the server too. Also tried the Can anyone help me delete this SQL job please ? Many Thanks

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