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• How to determine Jet database Engine Type programmatically

  - by MZB

  I have a program which needs to upgrade any Access (Jet) database it opens to JET Version4.x if it isn't already that version. (This enables use of SQL-92 syntax features) Upgrading is (relatively) easy. A call to the JRO.JetEngine object's CompactDatabase method (as described here) should do the trick, but before I do this I need to determine whether an upgrade is required. How do I determine the Jet OLEDB:Engine Type of an existing database? Can this be determined from an open OleDBConnection? Note: I'm talking about database versions, not Jet library versions. C# or .Net solution greatly appreciated.

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• Sql Server 2008 Cross-database table linking (relationships)

  - by Alex

  Hi guys, I have a bit of an issue, and to be honest I don't think there's an answer, but I'll give it a try anyway. So I have two databases [A]-Company and [B]-Product. Both databases have a Country table which is then linked to other tables in each individual database. The problem is that the data between the two Country tables is a complete duplicate. So, I essentially have to duplicate some of the relationships in each database, and maintenance on top of that is just difficult... So, I'm curious is there a way to create a cross-database relationship between tables so I can have only one set of Country+Helper tables that govern both databases? Thanks in advance!

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• Entity Framework with File-Based Database

  - by Dave Swersky

  I am in the process of developing a desktop application that needs a database. The application is currently targeted to SQL Express 2005 and works wonderfully. However, I'm not crazy about having this dependency on SQL Express and would prefer to use a small file-based database. My problem is that I am using Entity Framework. I have tried both SQL Compact and SQLite, and they both have bizarre problems with EF v1. I get errors creating the Model, invalid models when it does get created... it's a nightmare. I'm about ready to give up and write a data layer and repository in the good-old-school Connection/Command pattern. Not my favorite plan... Is there a lightweight, file-based database out there that plays well with EF? OR Is there a better ORM tool that I should use instead of EF with my lightweight DB?

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• Html combo box to database record Id

  - by LanguaFlash

  I'm fairly sure there has to be a simple solution to my problem, but I am a new web developer and can't quite figure it out. On my page I have a combo box whose values are filled from my database. When the user submits the form, how to I go about converting those values back to the record numbers in the database? Up to now I have been just doing a sort of reversed lookup in my database to try to get the record's ID. This has quite a few obvious flaws and I am sure that there has to be a better way. I am used to MS Forms combo boxes where the record data and ID are never separated. But in the case of a web form, I have no way to do multiple columns in the combo box like I am used to. Thanks! Jeff

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• Resizing Images with ASP.NET and saving to Database

  - by Ryan

  I need to take an uploaded image, resize it, and save it to the database. Simple enough, except I don't have access to save any temp files to the server. I'm taking the image, resizing it as a Bitmap, and need to save it to a database field as the original image type (JPG for example). How can I get the FileBytes() like this, so I can save it to the database? Before I was using ImageUpload.FileBytes() but now that I'm resizing I'm dealing with Images and Bitmaps instead of FileUploads and can't seem find anything that will give me the bytes. Thanks!

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• Open an Access database and run one of its Macros from Excel

  - by sqlnoob

  From Excel, I need to open an Access database and run one of the database's macros. I'm using Excel and Access 2007. Here is my code in Excel: Sub accessMacro() Dim appAccess As New Access.Application Set appAccess = Access.Application appAccess.OpenCurrentDatabase "C:\blah.mdb" appAccess.Visible = True appAccess.DoCmd.RunMacro "RunQueries.RunQueries" appAccess.CloseCurrentDatabase End Sub In the Access Database, there is a procedure named RunQueries in a module named RunQueries. Each time I run this, I get the following error: Runtime error '2485': Microsoft Access Office can't find the object 'RunQueries.' I have also tried: appAccess.DoCmd.RunMacro "RunQueries" and I get the same errors message. Any idea how to do this? By the way, I could go into a long explanation about why I need to do this, but let me just say that I've already argued against it, and I have to do it this way (meaning, I have to use Excel as a frontend to open several Access dbs and run their macros).

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• CLR Function not working in restored database

  - by Ben Thul

  So I've restore a database with CLR assemblies in it from one physical server to another. One of the functions in the CLR assembly essentially does an uncompress of some compressed data. When I run this function against data in the restored database it returns the compressed data (rather than the uncompressed data). No error is thrown in SSMS or in the SQL server error logs. At the suggestion of others, I've checked differences in the database ownership (both owned by sa), trustworthiness (both set to not trustworthy). I also checked differences in the .NET framework installs on both machines but found only that the target machine had a 1.1 version installed that the source didn't. I don't know what else to try. Any suggestions would be most appreciated. Thanks in advance. Thanks in advance, Ben

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• Do you use Scimore SQL database ?

  - by Darian Miller

  There's a database engine that looks amazing for a free tool and that is Scimore. Have you had much experience with it? If so, how does it rate..particularly against Firebird? How resilient/self reliant is it? (Meaning how much downtime/maintenance is expected?) The scale out capabilities also look very interesting. I just downloaded it and have been playing around and so far it looks good. I had been looking for an easy to deploy single-user type embedded database (which Scimore has an option) and was toying with MS SQL Compact Edition and SQLite and remembered this database from a trial a few years ago. (Windows platform) I was about ready to settle in on SQLite but started thinking about other projects which are multi-user and wanted to stick with a single solution...which is why I started looking at Firebird as well.

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• Storing dates as UTC in database

  - by James

  I am storing date/times in the database as UTC and computing them inside my application back to local time based on the specific timezone. Say for example I have the following date/time: 01/01/2010 00:00 Say it is for a country e.g. UK which observes DST (Daylight Savings Time) and at this particular time we are in daylight savings. When I convert this date to UTC and store it in the database it is actually stored as: 31/12/2009 23:00 As the date would be adjusted -1 hours for DST. This works fine when your observing DST. However, what happens when the clock is adjusted back? When I pull that date from the database and convert it to local time that particular datetime would be seen as 31/12/2009 23:00 when in reality it was processed as 01/01/2010 00:00. Correct me if I am wrong but isn't this a bit of a flaw when storing times as UTC?

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• Android insert into sqlite database

  - by Josh

  I know there is probably a simple thing I'm missing, but I've been beating my head against the wall for the past hour or two. I have a database for the Android application I'm currently working on (Android v1.6) and I just want to insert a single record into a database table. My code looks like the following: //Save information to my table sql = "INSERT INTO table1 (field1, field2, field3) " + "VALUES (" + field_one + ", " + field_two + ")"; Log.v("Test Saving", sql); myDataBase.rawQuery(sql, null); the myDataBase variable is a SQLiteDatabase object that can select data fine from another table in the schema. The saving appears to work fine (no errors in LogCat) but when I copy the database from the device and open it in sqlite browser the new record isn't there. I also tried manually running the query in sqlite browser and that works fine. The table schema for table1 is _id, field1, field2, field3. Any help would be greatly appreciated. Thanks!

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• How to send html form data from one form to multiple database tables

  - by user1701556

  I am able to send html form data to database using hibernate. I am using mySQL, Hibernate, Java 1.6, Spriong 3.0. But I would like to send that same data to multiple tables in the database. My issue is that I want to use only one html form not multiple html form. I have these tables: name, address, email, login, phone_num. From this one html form I want data to go to different tables depending on what the data is. I want to do it using Hibernate so that I am not manually taking form data and inserting it in the database. Please let me know if this is possible.

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• migrate database from sybase to mysql

  - by jindalsyogesh

  I have been trying to migrate a database from sybase to Mysql. This is my approach: Generate pojo classes from my sybase database using hibernate in eclipse Use these pojo classes to generate the schema in mysql database Then somehow migrate the data from sybase to mysql I guess this approach should work??? Please let me know if there is any better or easier approach. The thing is I am not even able to get the first step done. I added hibernate plugin in eclipse from this link: [http://download.jboss.org/jbosstools/updates/stable/][1] I added sybase jar file to my project classpath Then I added hibernate console configuration file Then I added hibernate configuration file Then I added hibernate code generation configuration When I try to run the code generation configuration file, I am getting java.lang.NullPointerException and I have no idea how to fix it. I searched a lot of forums, tried to google it, but I not able to find any solution. Can anybody tell me what mistake I am making here or point to some hibernate tutorial for eclipse??

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• python fdb save huge data from database to file

  - by peter

  I have this script SELECT = """ select coalesce (p.ID,'') as id, coalesce (p.name,'') as name, from TABLE as p """ self.cur.execute(SELECT) for row in self.cur.itermap(): xml +=" <item>\n" xml +=" <id>" + id + "</id>\n" xml +=" <name>" + name + "</name>\n" xml +=" </item>\n\n" #save xml to file here f = open... and I need to save data from huge database to file. There are 10 000s (up to 40000) of items in my database and it takes very long time when script runs (1 hour and more) until finish. How can I take data I need from database and save it to file "at once"? (as quick as possible? I don't need xml output because I can process data from output on my server later. I just need to do it as quickly as possible. Any idea?) Many thanks!

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• Save in Sessions to reduce database load

  - by Kovu

  at the moment I try to reduce the load on my database extremly, so I had a look in my website and think about - what database calls can I try to avoid. So is there a rule for that? Sould I save every information in a Session that is nearly never changed? e.g.: The User-Table is a 35-coloumn-table which I need so often in so different ways, that in the moment I got this user-object at nearly every PageLoad AND in the master-site-page-load (Settings, display the username for a welcome message, colors etc etc.). So is that good to avoid the database query here, save the User-Object in a Session and call it from the session - and of course destroy the session whereever the User-Object get changed (e.g. User change his settings)?

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• Add database to plesk domain account via XML

  - by Ryan French

  Hi All, I'm currently working on trying to integrate a site with Plesk via the XML API and I've run into a bit of an issue. I've managed to get most things working but I'm trying to add a database to a domain and I keep getting an error. When creating the database I extract a list of Domain Accounts associated with the current clients account, and use the domain guid that is returned in the XML to try and create the new database, but Plesk is returning an error stating that the id I am using is not a valid id. I've looked at the documentation and it is saying that the domain ID that I should be sending is an integer, but the only ID I can find for the domain is the guid, which is a string. Anyone done anything like this before and know where I can get the ID from?

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• Looking for a file database

  - by Mitchell Skurnik

  A few years ago there was a PHP script around called paFileDB. Essentially it created a database of files that end users could download and rate. It would keep track of the number of downloads as well. I am looking for a replacement of this coded in ASP.net C#. For the last week I have been searching around for "asp.net C# file database" and have just gotten how to upload files to a database. I have also search with some other terms. I do not need a full blown CMS like DotNetNuke or SharePoint. All I have been looking for is a system I could easily add to my existing .net C# site. I have thought about coding one myself, but with me being rather busy at work and this being a personal project, I simply do not have the time to code this myself. I hope that you guys can help. Thank you!

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• PHP eval() code in between <?php ?> from database

  - by kr1zmo

  Some of you may be annoyed with this question, and claim it's unsafe blah blah. I want to be able to put php into the database and run it. I have to do this because I store page layouts in the database and each our different for each other, however in some cases I want to use dynamic content for some of the pages. assume $query_from_db is the string returned from the database. php should only eval() the code in between <?php and ?> $query_from_db = '<div> <?php //php to run function dosomething() { //bleh } ?> </div> '; php echo eval($query_from_db);

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• Managing Large Database Entity Models

  - by ChiliYago

  I would like hear how other's are effectively (or not) working with the Visual Studio Entity Designer when many database tables exists. It seems to me that navigating the Designer is tough enough to find what you are looking for with just a few tables but how about a database with say 100 to 200 tables? When a table change is made at the database level how is the model updated? Does it overwrite any manual changes you have made to the model? How would you quickly find an entity in the designer to make a change or inspect a change? Seems unrealistic to be scrolling around looking for specific entity. Thanks for your feedback!

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• limit of connections with database and number of java threads in an application

  - by Jyoti

  Hi, I am working to develop a JMS application(stand alone multithreaded java application) which can receive 100 messages at a time , they need to be processed and database procedures need to be called for inserting/updating data. Procedures are very heavy as validations are also performed in them. Each procedure is taking about 30 to 50 seconds of time to execute and they are capable to run concurrently. My concern is to execute 100 procedures for all 100 messages and also send reply within time limit of 90 seconds by jms application. No application server to be used(requirement) and database is Teradata (RDBMS) I am using connection pool and thread pool in java code and testing code with 90 connections. Question is : (1) What should be the limit on number of connections with database at a time? (2) How many threads at a time are recommended? Thanks, Jyoti

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• Display the newest result from my database

  - by nogggin1

  Im building a webpage that displays the newest result from a database as a news article. The parts of the database are title, bodytext and created although I wish to keep created hidden. I am quite new to PHP and dont have any idea how to do this, could i please get some help just to display it as: title bodytext i need to be able to connect to the database with my details then display the results in a div i have set up. although i only want to show the newest result! thank you. Ned Perkins

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• Queue access to the database to avoid multiple cache items

  - by MikeJ

  I have a music related ASP.NET web site which caches a lot of static information from the database on the first request. Sometimes, the application is reset and cache is cleared while the application is on heavy load and then all http requests go to the database to retrieve that static data and cache it for other requests. How can I ensure that only one request go to the database and cache the results, so that other request simply read that info from cache and not needlessly retrieve the same info over and over again. Can I use thread locking? For example, can I do something like lock(this) { db access here }?

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• Upload File to Database in ColdFusion

  - by George Johnston

  I simply would like to upload a file to my database using ColdFusion. I understand how to upload an image to a directory, but I would like to place it directly in the database. I have set a database field to varbinary(MAX) to accept the image and have the stored procedure to insert it. Currently my code for uploading the image to my file system is: <cfif isdefined("form.FileUploadImage")> <cffile action="upload" filefield="FileUploadImage" destination="#uploadfolder#" nameconflict="overwrite" accept="image/*" > </cfif> I've obviously left some of the supporting code out, but really all I need to do is get a binary representation of the file stored in memory, instead of the file system. Any experts out there that can help? Thanks, George

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• Getting my webapp to be database agnostic with Hibernate...

  - by JellyHead

  So the ultimate in scope-creep came in the other day: since we're using Hibernate, could we make our webapp run on Oracle as well as MySQL, interchangably? I thought this would be a simple case of changing hibernate.cfg.xml so that instead of explicity stating MySQL-specific options, it would reference a JNDI datasource, allowing the application to build regardless of the database we intend to deploy to. Then changing to a different database would simply mean changing the separate datasource configuration in JBoss, Jetty, WebLogic etc. Is this realistic? Well, I got as far as setting that up in Jetty, but What's tripping me up right now is error about the hibernate.dialect not having been set in hibernate.cfg.xml. But If I set the dialect there, then my app is still going to be built in either MySQL or Oracle flavours, which is not really what I want. Either I'm trying to attempt the impossible or I've missed something fundamentally obvious... anyone else had a similar problem (and subsequent solution/workaround)?

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• Rails: has_many association with a table in another database and without foreign key

  - by Fernando

  Here is my situation. I have model called Account. An account can have one or more contracts. The problem is that i'm dealing with a legacy application and each account's contracts are stored in a different database. Example: Account 1's contract are in account1_db.contracts. Account 2's contract are in account2_db.contracts. The database name is a field stored in accounts table. How can i make rails association work with this? This is a legacy PHP application and i simply can't change it to store everything in one table. I need to make it work somehow. I tried this, but it didn't worked: has_many :contracts, :conditions => [lambda{ Contract.set_table_name(self.database + '.contracts'); return '1' }] Any ideas?

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• php fail to open a sqlserver 2000 database

  - by Mike108

  I can use the sql server management studio to open a sqlserver 2000 database, but I can not open the same database in a php page using the same user and password. what is the problem? if(!$dbSource->open("192.168.4.241:1433","sa","sa","NorthWind")) { echo "Fail to open the sql server 2000 database"; } ----------------------- function open($db_server, $db_user, $db_password, $db_name) { $this->conn = mssql_connect($db_server, $db_user, $db_password); if(!$this->conn) { return false; } @mssql_select_db($db_name, $this->conn); return true; }

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