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• How best can I extract a logical model from a physical DB model

  - by Dean

  We have made substantial changes to our physical DB, now as it is the ne dof the project I would like to abstract a logical model from this, to allow me to generate schemas for both Oracle and SQL Server. Can anyone guide me as to the best way to achieve this. I was hoping TOAD data modeller would help but I can't seem to see any options to do what I require?

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• REALBasic reporting with SQLite3 DB

  - by orangecl4now

  How do I create a report using SQLite3 DB? I'd appreciate just step by step or pseudo-code.

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• rails db:seed no method error

  - by louddwarf

  when I try and run the "rake db:seed" command the rails console outputs "NoMethodError: undefined method `db' for #" not quite sure what going on. I'm using netbeans to build my rails project which is using the built-in JRuby 1.2 would that have anything to do with it?

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• DataContext to DB

  - by JD

  Hi all, I have designed my DB using the ORM in VS 2008. What is the best way to export this to an SQL server so it will create the tables and relations on SQL Server? Thanks, JD

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• Selecting financial values from db stored as text

  - by Midhat

  I have some financial values stored as text in a mysql db. the significance of financial is that negative numbers are stored enclosed in paranthesis. is there a way to automatically get the numeric value associated with that text. (like '5' shoudl be retuned as 5 and '(5)' should be returned as -5)

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• Rails: Using memcached on a horizontally partitioned DB

  - by ming yeow

  I am using a sharded db - horizontally partitioned. I am using the DataFabric gem from FiveRuns. What would be the implications of using memcached on this? Would it work the same as if I was using ActiveRecord?

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• Get values from DB field into an array with PHP

  - by Adnan

  Hello, I have a field in my DB that holds value separated by commas like; $tmp_list = "COB,ISJ,NSJ," Now when I fetch that the row, I would like to have them in an array. I have used array($tmp_list) but I get the values in one line only like: [0] => 'COB,ISJ,NSJ,' instead of [0] => 'COB', [1] => 'ISJ', [2] => 'NSJ' All help is appriciated.

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• How to insert / retrieve a file stored as a BLOB in a MySQL db using python

  - by Phage

  I want to write a python script that populates a database with some information. One of the columns in my table is a BLOB that I would like to save a file to for each entry. How can I read the file (binary) and insert it into the DB using python? Likewise, how can I retrieve it and write that file back to some arbitrary location on the hard drive?

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• Saving multiple select form data in db

  - by fl00r

  Hi. I've got form for some model A, which has got few fields: tile description ... colors colors are selected from multiple select and options are ['red', 'green', 'blue', 'yellow']. User can choose colors as many as he wants. I don't think that making Color model and has_many relationship is good solution here to store colors data in model A. So question is: How to store multiple data in db for such multiple select forms?

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• Java class in DB

  - by Debuger

  Hi! Can anyone explain why was idea to store Java class in Db? What it is good for? And how to create stored procedure with Java class? Best regards!

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• DB.Null equivalent in JDBC

  - by Fakrudeen

  Is there an equivalent of (ADO.NET) DB.Null in JDBC? Or do I simply pass null in the parameter? Particularly in the context of Mysql?

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• Databases: Migrate data between MS Access DB and MYSQL

  - by Dean

  Hello, I have 2 databases, one is MS Access DB from an old website, and the other one is MYSQL from the new Joomla+VirtueMart based website. I need to migrate existing products from MS Access to MYSQL. I thought of putting both on server and writing SQL queries in MYSQL workbench, untill I have a good script for that, but I'm very new to SQL, so I'd rather avoid that. I there a better way and more efficient for that?

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• SimpleDB as Denormalized DB

  - by Max

  In an environment where you have a relational database which handles all business transactions is it a good idea to utilise SimpleDB for all data queries to have faster and more lightweight search? So the master data storage would be a relational DB which is "replicated"/"transformed" into SimpleDB to provide very fast read only queries since no JOINS and complicated subselects are needed.

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• Restoring Typus plugin after changing DB Schema

  - by benoror

  I installed Typus plugin (http://intraducibles.com/projects/typus) for my app and I love it. But along the development of the app I frequently do migrations and change the DB Schema and relationships, and then the plugin fails. Is there a way to re-generate the plugin with the new schema? Thanks!

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• Which DB (SQL) is better supported in Erlang ?

  - by Konstantin

  Hello! What do you recommend me to use with Erlang -- MySQL or Postgres ? Which DB has better (more mature, more stable, faster) driver for Erlang ?

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• Check if db connection is closed - php

  - by Hamad

  Db connectivity is handled by an include. I want to run this command: mysql_close($con); Only if we currently have a connection. Something like isset()? Thanks Hamad

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• Dynamically Insert Variables into DB Table using PreparedStatement

  - by gran_profaci

  I was working with PreparedStatement today and noticed that it used setString() setTimestamp() etc. to insert variables into the DB. I basically have 20 tables each with at least 15 columns and it would not be feasible for me to manuallt write down all the setters. Considering that I have an ArrayList "Vals" which contains all the variables to be inputted in String format (obtained by getString() using PreparedStatement itself), is there any way I can do an insert without using expressly using the Setters? That would save me a lot of time.

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• Table in DB for generating primary keys?

  - by Sapphire

  Do you ever use a separate table for "generating" artificial primary keys for DB (and why)? What I mean is to have a table with two columns, table name and current ID - with which you could get new "ID" for some table by simply locking the row with that table name, getting the current value of the key, increment it by one, and unlock the row. Why would you prefer this over standard integer identity column? P.S. The "idea" is from Fowlers Patterns of Enterprise Application Architecture, btw...

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• How to syncronize merge subscription in Sql Compact DB (on a Mobile device emulator)

  - by Bero

  Using SQL ManagementStudio 2008 I created SQL 3.5 Compact DB (TestCompact.sdf) and I have created subscription to existing Publication. Using SQL Management Studio it is working. I have transfered TestCompact.sdf to Windows Mobile 5 emulator device and with QueryAnalyzer for Mobile I could query existing tables in TestCompact.sdf. I don't know how to start replication synchronization on that mobile device. Do I need to write some C# code or it is possible do it more simple?

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• How to store short date format to db?

  - by HelloWorld

  I use NSCoreData , I want to store this formatted date to db, field type is date, how can I do this? date formatted: 2010-10-31 I hope I explained my scenario. Sorry for my English. Greetings.

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• Running a sharded DB from a single machine

  - by ming yeow

  This sounds kinda dumb, but I have a sharded DB that I no longer think I need to run on 2 machines, and would like to run on one single machine instead. Any ideas on how that can potentially be done? There are lots of resources on how i can achieve the converse, but very little on how this can be done

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• Marking deleted records in DB tables

  - by Emanuil

  Sometimes you want to mark a DB table record as deleted instead of deleting it permanently, right? How do you do that? So far I've been using a boolean "deleted" field.

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• Last results submitted in mysql db

  - by Tapha

  How would i get the last 20 results submitted in a mysql db row. I need the 20 most recent user submitted results. Cheers.

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• Expand my knowledge in DB programming

  - by talgleichger

  Hi there, my name is Tal, Im working on a PHP Application the should have lots and lots of records, what DB should I use, and are there guides on the web that explains how to build efficient dbs and tables? Tnx!

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• CodeIgniter: is $_POST already clean for db input?

  - by Shishant

  Hello, This is my first app with CI and I want to know whether $_POST is clean and can I directly insert the data into db? I have enabled $config['global_xss_filtering'] = TRUE; Thank You.

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