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• Friendfeed schemaless data in MYSQL

  - by John Stewart

  I read an article around schema-less database which sounds cool. (http://bret.appspot.com/entry/how-friendfeed-uses-mysql) But what isn't clear to me is how do they run search queries on this data? Since the data is in JSON format how do we look for it?

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• What's a good PHP Active Record library?

  - by Luca Matteis

  I've been using CodeIgniter for some quite time, and I've been extremely happy with its Active Record stuff. It's great to query the database with it. Recently I've started a new project and I can't use such a framework anymore. Is there a simple PHP Active Record library that does its job and gets out of the way (similar to CodeIgniter's version)?

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• SQL Query to get the table names which use a particular column as a foriegn key

  - by vinayvasyani

  What sql query would you write to get the table names which have a particular foriegn key. Eg. Person_Table(person_id,name,address,...) Purchases_Table(purchaseid, purchased_by_id(fkey)....) AccountDetails_Table(AccountId,PersonID,....) Roles_Table(PersonId,RoleID) Now i want to find the table names where Person id is used as a foreign key. The above schema would return me Purchases_Table,AccountDetails_Table, Roles_Table Database: SQL Server

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• GNU GPL - access to data?

  - by Ke

  Hi, I realise that modified versions of the software should be freely available, but what about the content that is held within a mysql database for instance? does that have to be available too? Cheers ke

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• mapping Field with variable type using Hibernate Annotaion

  - by Zahra

  Hi. how can I have a field with variable type in my class? I use hibernate annotation for mapping to DB. I tried to use java.io.Serializable as field's type, but it mapped to database as a 01 amount which is true if I get it's object and cast it to it's true type. but I need to run a query on this objects that needs true amount of field.(right now I can't compare an integer field with a number) Does anyone have any idea how can I do this? Thanks in advance.

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• Generating an Excel file in ASP.NET

  - by Dan Coates

  I am about to add a section to an ASP.NET app (VB.NET codebehind) that will allow a user to get data returned to them as an Excel file, which I will generate based on database data. While there are several ways of doing this, each has its own drawbacks. How would you return the data? I'm looking for something that's as clean and straightforward as possible.

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• MySQL Error 2013

  - by kova

  I am facing connection failure to MySQL problem when I run my program for more than couple of days.MySQL Error Code is 2013 while connecting to Database. MySQL server and client programs are both on same machine. I am using FC5 as my OS and MySQL version is 5.0.18. Can anybody throw some light on this? I am getting mysql error 2013 while calling mysql_real_connect()... Any help is appreciated. Thanks in Advance k o v a

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• How to make a computed field in a data window object read-only

  - by Archangel

  I hava a data window object, in which I am fetching some attributes from the database to show it to the users. I want to make the computed fields read-only, so that the user can not modify them. How can I make a computed field read-only?

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• Is it worth a try LINQ to SQL as a beginner to an ORM?

  - by Pandiya Chendur

  Thus far used sql server stored procedures for all my web applications... Now thought of moving to an ORM... I would like to ask SO users about LINQ to SQL Is Linq to sql worth a try as a beginner to an ORM? or should i look for some others... Any suggestion... EDIT: I have a sql server 2005 database with all tables.... How to use this db with Linq to sql?

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• MySQL: Ignore the timestamp attribute

  - by Nique

  I have a timestamp column in my database, and i use it for almost every field, but now, i just want to update the hit counter.. and i do not want to update the timestamp column with it. I use the timestamp field to see the last 'content' update. Not for every hit. Is it possible to let mysql stop updating the timestamp column for just one query?

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• Autocomplete a textbox in c#

  - by Suryakavitha

  Im trying to autocomplete an textbox .Im retrieve values from Access Database .Jus one field from Datatable.. If anyone can help me. Thanks in advance

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• Deploying two Grails apps on Tomcat ignores one DataSource

  - by John Wheeler

  I have two applications each pointing to a different database. when I deploy these applications to Tomcat at the same time, whichever datasource gets loaded first is the same datasource that gets used for both apps. I am using the latest Tomcat and Grails.

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• Simplest way to authenticate users across multiple websites/applications in .NET

  - by Schneider

  The ways I can think of are: Use Windows Identity Foundation (WIF). I have never done this so is a black box and risky. Use Forms Authentication or similar, then use database replication to make sure each application has access to the data store. No doubt there are other options.

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• JPA and PostqreSQL: long string persistence

  - by emanemos

  Can anybody tell me how to persist long text using JPA (I use PostgreSQL)? Here's the way I defined a very long string in my class: @Lob private String body; However, this produces a field of type charactervarying(255) in the database. Furthermore, I've tried to use @Column annotation: @Column(columnDefinition="TEXT") private String body; But everything in vain. I would be gratefull for a helpfull comment on this problem.

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• CLLOcationManager will work correctly in iphone sdk?

  - by Mikhail Naimy

  hi, I am using the code which is in the URL stackoverflow.but I have done database operation in that method(didEnterRegionCLRegion ).Will it work correctly without opening the application (in background).I have given alert also.but it is not called.anyone who is experienced , help me in this matter?I am in India..will it give only correct GEO information only for AT&T service provider?Apple did not give any sample code for it?I have registered location in viewcontroller, i have to do the same in any Delegate methods?

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• How i can design a cache system using PDO and memcached?

  - by losbits

  Hi, I'm using PDO for connect to the database in a system where I want implement memcached. I don't know what keys use for caching the results because I can't get the string of the final query with PDO (because the prepared statements). Any good idea for resolve this? Thanks in advance.

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• Drupal: Renumbering node ids

  - by AK

  Having spent some time migrating old data into a new drupal site, my first node id is already into the 4 digit territory. Has anyone had any experience in this position of renumbering node ids starting from #1? Maybe using direct queries on the database, or a module that traverses and renumbers all the nodes? Of course, nodereferences have to be preserved... are there any other potential hangups if I try to script this?

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• Oracle: how to add a text node into an existing element

  - by Alessandro Vernet

  In Oracle, you can write: update t set xml = updateXML(xml, '/a/b/text()', 'gaga') This works only if you already have some text in the <b> element. How to update the document and "add some text" in <b> if the document in the database looks like: <a> <b/> </a>

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• SQL DROP TABLE foreign key constraint

  - by Polly Hollanger

  If I want to delete all the tables in my database like this, will it take care of the foreign key constraint? If not, how do I take care of that first? GO IF OBJECT_ID('dbo.[Course]','U') IS NOT NULL DROP TABLE dbo.[Course] GO IF OBJECT_ID('dbo.[Student]','U') IS NOT NULL DROP TABLE dbo.[Student]

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• Getting $_POST variable from table

  - by Sakamoto Kazuma

  I'm trying to build a sort of resource allocation form. I'd like to be able to print a table from a database, and then allow users to click on each cell that they would like to reserve. Also, being able to drag and select multiple cells. Then send all of this via $_POST to another php script. Problem is, I have no idea where to start. Any suggestions?

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• Error when restoring SSAS cube: MemberKeyesUnique element at line xxx cannot appear under (...)/Hier

  - by Phil

  Hi, I'm getting this error when trying to restore an SSAS database from a backup: The ddl2:MemberKeysUnique element at line 63, column 4862 (namespace http://schemas.microsoft.com/analysisservices/2003/engine/2) cannot appear under Load/ObjectDefinition/Dimension/Hierarchies/Hierarchy. Google hasn't turned up any helpful solutions. (a lot of people found that installing SP2 made the error go away but this has always previously worked in our environment) I don't really understand what the error means. Can somebody interpret or suggest a fix? Thanks, Phil

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• .NET and C# Exceptions. What is it reasonable to catch.

  - by djna

  Disclaimer, I'm from a Java background. I don't do much C#. There's a great deal of transfer between the two worlds, but of course there are differences and one is in the way Exceptions tend to be thought about. I recently answered a C# question suggesting that under some circstances it's reasonable to do this: try { some work } catch (Exeption e) { commonExceptionHandler(); } (The reasons why are immaterial). I got a response that I don't quite understand: until .NET 4.0, it's very bad to catch Exception. It means you catch various low-level fatal errors and so disguise bugs. It also means that in the event of some kind of corruption that triggers such an exception, any open finally blocks on the stack will be executed, so even if the callExceptionReporter fuunction tries to log and quit, it may not even get to that point (the finally blocks may throw again, or cause more corruption, or delete something important from the disk or database). May I'm more confused than I realise, but I don't agree with some of that. Please would other folks comment. I understand that there are many low level Exceptions we don't want to swallow. My commonExceptionHandler() function could reasonably rethrow those. This seems consistent with this answer to a related question. Which does say "Depending on your context it can be acceptable to use catch(...), providing the exception is re-thrown." So I conclude using catch (Exception ) is not always evil, silently swallowing certain exceptions is. The phrase "Until .NET 4 it is very bad to Catch Exception" What changes in .NET 4? IS this a reference to AggregateException, which may give us some new things to do with exceptions we catch, but I don't think changes the fundamental "don't swallow" rule. The next phrase really bothers be. Can this be right? It also means that in the event of some kind of corruption that triggers such an exception, any open finally blocks on the stack will be executed (the finally blocks may throw again, or cause more corruption, or delete something important from the disk or database) My understanding is that if some low level code had lowLevelMethod() { try { lowestLevelMethod(); } finally { some really important stuff } } and in my code I call lowLevel(); try { lowLevel() } catch (Exception e) { exception handling and maybe rethrowing } Whether or not I catch Exception this has no effect whatever on the excution of the finally block. By the time we leave lowLevelMethod() the finally has already run. If the finally is going to do any of the bad things, such as corrupt my disk, then it will do so. My catching the Exception made no difference. If It reaches my Exception block I need to do the right thing, but I can't be the cause of dmis-executing finallys

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• how do i read strings from text files?

  - by ratty

  I like to read string from text file the text file consists of information below con = new MySqlConnection("server=localhost;user id=root; password=""; database=workplantype; pooling=false;"); i like to read server name such as"localhost" here and user id such as"root" here,how can i read this.

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• What is wrong with this connection string?

  - by Hakan

  Can any one help me with this connection string. I can't manage how to fix. Dim constring As String Dim con As SqlCeConnection Dim cmd As SqlCeCommand constring = "(System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase) + \\database.sdf;Password=pswrd;File Mode=shared read" con = New SqlCeConnection() con.Open() Thanks

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• What is the best way to implement multilingual domain objects using NHibernate?

  - by Amitabh

  I have found few links but could not decide which one is the best way. http://fabiomaulo.blogspot.com/2009/06/localized-property-with-nhibernate.html (This stores all localised language data in one field. Can be a problem if we query from Sql) http://ayende.com/Blog/archive/2006/12/26/LocalizingNHibernateContextualParameters.aspx (This one has a warning at the beginning that it is a hack and no longer supported) http://www.webdevbros.net/2009/06/24/create-a-multi-languaged-domain-model-with-nhibernate-and-c/ (This does not describe how multilingual data will be structured in the database.)

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