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Convert SQL Server DB to SQLite DB

, 13 Jan 2013
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A C# utility to automatically do conversion from a SQL Server DB to a SQLite DB
convsqlservertosqlite/converter.png

Introduction

I needed to convert the existing SQL server databases to SQLite databases as part of a DB migration program and did not find any decent free converter to do the job.

This is my attempt to solve the problem. I should warn you though that I did not have much time to test it on too many databases. In any case - the source code is very well documented and easy to understand, so if you do have a problem it should be relatively easy to fix. (Please send me the fixed source code. If you do so, I can update the software so that everybody can enjoy it.)

Using the Code

The code is split between a dataaccess project (class library) that contains the conversion code itself and a converter project (WinForms) that drives the conversion code and provides a simple UI for user interaction.

The main class that performs the conversion is the sqlservertosqlite class. It does the conversion by doing the following steps:

  1. Reading the designated SQL server schema and preparing a list of tableschema objects that contain the schema for each and every SQL server table (and associated structures like indexes).
  2. Preparing an empty sqlite database file with the schema that was read from SQL server. In this step, the code may alter few SQL-server types that are not supported directly in sqlite.
  3. Copying rows for each table from the SQL server database to the sqlite database.

Basically, that's it!

Points of Interest

In order to read the SQL server DB schema, I was mainly using the pseudo information_schema.table table. You can find more information about it on the Internet if you want.

History

  • 13th June, 2008: Initial version
  • 08th July, 2008: v 1.2
    • Fixed a bug that caused unique indexes to be generated as non-unique in some cases
  • 08th July, 2008: v 1.3
    • Fixed a bug that caused the utility to crash sometimes when processing index information
  • 17th July, 2008: v 1.4
    • Fixed a bug that caused wrong columns to become primary keys on rare occasions and improved conversion performance
  • 20th July, 2008: v 1.5
    • Added support for case-insensitive columns (COLLATE NOCASE)
  • 22nd July, 2008: v 1.6
    • Added support for encrypting the resulting DB file (using the built-in encryption support that exists in the SQLite .NET provider)
  • 05th October, 2008: v 1.7
    • Fixed information_schema references to use UPPER-CASE in order to resolve international character set issues (Turkish)
  • 14th December 2008: v1.8
    • Integrated support for foreign keys from the revised version made by Yogesh Jagota
    • Merged support for selective table import
  • 21st February 2009: v1.9
    • Added contribution from johnny dickson cano that allows to select using SQL server integrated security or using user name /password instead
    • Added support for converting IDENTITY columns to AUTOINCREMENT in SQLite (suggestion by Paul Shaffer)
  • 04th March 2009: v1.10
    • Fixed a bug that caused the converter to crash when encountering a datetime field in the original SQL server schema. Thanks to bmcclint for sending me the bug with the correct bugfix.
  • 23rd May 2009: v1.11
    • Added support for simulating foreign keys using triggers (contributed by Martijn Muurman)
    • Added a small bugfix so that now an 'int' type is always converted to 'integer' type in sqlite. This was needed because sqlite will autoincrement only on 'integer' column types.
  • 04th June 2009: v1.12
    • Fixed a bug in trigger generation code that caused schema generation to fail when more than a single column is referencing the same column in a foreign table
  • 20th September 2009: v1.13
    • Fixed AUTOINCREMENT bug suggested by MAEP
    • Fixed 64 bit support problem (thanks to Murry Gammash)
    • Added support for converting SQL Server views (suggested by Richard Thurgood)
  • 22nd September 2009: v1.14
    • Fixed a critical bug that caused the conversion process to fail on some SQL Server databases that used the [dbo] notation.
  • 25th September 2009: v1.15
    • Fixed a critical bug that caused the primary keys to be discarded
    • Fixed trigger generation bug
  • 4th December 2009: v1.16
    • Fixed generation code to create GUID types for SQL-Server's uniqueidentifier type (instead of nvarchar as it was until now)
    • Updated the solution to use the latest SQLite .NET provider library
  • 24th March, 2011
    • Attached compiled version of the project for anyone that doesn't have Visual Studio and still needs to use the utility
  • 1st July, 2011
    • Updated binary zip as the earlier one was missing the DLL file needed by the application
  • 15th Nov 2011: v1.17
    • Fixed a bug that caused the software to crash when encountering NULL values in some of SQL Server meta data tables
  • 19th June 2012: v1.19
    • Added support for ignoring views when creating the DB schema, Added support for blank characters inside column names.
  •  14th January 2013: v1.20
    • Fixed problem with column names
    • Added more width to the database names combo box. 

License

This article, along with any associated source code and files, is licensed under A Public Domain dedication

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About the Author

liron.levi
Software Developer Arineta Cardio Imaging
Israel Israel
My name is Liron Levi and I'm developing software for fun & profit for 15 years already. I'm now working for Arineta Cardio Imaging as a software developer (the company develops a CT machine).
 
I can be contacted directly at liron.levi@outlook.com or via linkedin at http://www.linkedin.com/pub/liron-levy/1/578/ab5

Comments and Discussions

 
QuestionTnx very much PinmemberMember 454708710-Aug-14 5:25 
Questionconverter is not working PinmemberMember 1094752815-Jul-14 1:19 
AnswerRe: converter is not working Pinpremiumliron.levi15-Jul-14 2:05 
QuestionHaving problem in conversion from Sql express 2005 to sqlite PinmemberRahul saraswat24-Jun-14 19:26 
GeneralNice Work Pinmemberwh_ghost19-Jun-14 0:50 
GeneralRe: Nice Work Pinpremiumliron.levi19-Jun-14 1:53 
QuestionConverting to .s3db format Pinmembernirav savla5-Jun-14 19:40 
Questionconvetor error PinmemberMember 1036978730-May-14 3:48 
AnswerRe: convetor error Pinpremiumliron.levi31-May-14 0:15 
GeneralRe: convetor error PinmemberMember 1036978731-May-14 4:01 
GeneralRe: convetor error Pinpremiumliron.levi31-May-14 5:33 
GeneralRe: convetor error PinmemberMember 1036978731-May-14 5:54 
GeneralRe: convetor error Pinpremiumliron.levi31-May-14 21:42 
GeneralRe: convetor error PinmemberMember 103697871-Jun-14 0:27 
GeneralThanks a lot ... Pinmembercg12114-May-14 7:43 
QuestionCannot convert datetimeoffset. PinmemberPriyakaran1013-May-14 1:34 
AnswerRe: Cannot convert datetimeoffset. PinmemberMember 265583229-May-14 8:35 
QuestionThanks PinmemberThillairaja9-Apr-14 8:47 
QuestionReply For Thanks Pingroupsayyedtanveer25-Mar-14 22:22 
QuestionPerformance PinmemberHardy_Smith18-Mar-14 7:29 
QuestionSolution to: "The process cannot access the file .." with newer System.Data.SQLite versions PinmemberMember 354318414-Feb-14 1:32 
Questionupdates Pinmemberkiquenet.com21-Jan-14 9:08 
QuestionIMPRESSIVE! PinmemberRhefew9-Dec-13 8:45 
QuestionSQL Server Management Studio PinprofessionalMember 1040253520-Nov-13 10:38 
AnswerRe: SQL Server Management Studio Pinmemberliron.levi20-Nov-13 11:12 

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