Click here to Skip to main content
Click here to Skip to main content

Convert SQL Server DB to SQLite DB

, 13 Jan 2013
Rate this:
Please Sign up or sign in to vote.
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

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

 
QuestionMy vote of 5 Pinmemberfrazzle-me4-Apr-13 9:19 
AnswerRe: My vote of 5 Pinmemberliron.levi4-Apr-13 23:00 
GeneralMy vote of 5 PinmemberMember 805299226-Mar-13 0:04 
QuestionDatabase Encoding PinmemberRafael Vetrone20-Mar-13 4:34 
AnswerRe: Database Encoding Pinmemberliron.levi20-Mar-13 5:54 
GeneralRe: Database Encoding PinmemberRafael Vetrone21-Mar-13 9:02 
Questionsuperb program :) PinmemberJames loong10-Mar-13 17:54 
AnswerRe: superb program :) Pinmemberliron.levi10-Mar-13 21:09 
Answergood PinmemberMember 15605935-Feb-13 21:32 
QuestionGreat PinmemberWin32nipuh23-Jan-13 4:22 
AnswerRe: Great Pinmemberliron.levi26-Jan-13 19:53 
GeneralMy vote of 5 PinmemberEdo Tzumer14-Jan-13 1:42 
GeneralRe: My vote of 5 Pinmemberliron.levi14-Jan-13 4:12 
QuestionSelect DB Dropdown List Width PinmemberMember 975255913-Jan-13 6:58 
Any chance of making the dropdown list where you select the database wider? The list window is so narrow that I can't tell which database I'm selecting (many of our databases start with the same 20 characters... I'm hoping not to have to rename them). Other that this one minor issue, the program has been great!
 
I'd consider looking into this myself except that I don't have a Windows development environment.
 
Thanks,
Greg
AnswerRe: Select DB Dropdown List Width Pinmemberliron.levi13-Jan-13 20:07 
GeneralRe: Select DB Dropdown List Width PinmemberMember 975255914-Jan-13 16:02 
QuestionGreat!! PinmemberMember 358483425-Dec-12 20:06 
QuestionThanks.. Great. Pinmemberjutatip16-Dec-12 17:38 
QuestionForeign Key mismatch Problems Pinmembersekerg16-Dec-12 6:21 
QuestionGreat! PinmemberMember 770135722-Nov-12 22:02 
AnswerRe: Great! Pinmemberliron.levi23-Nov-12 3:49 
Questionunsuppoerted file error while connecting ? Pinmemberoguzkaygun26-Oct-12 8:20 
AnswerRe: unsuppoerted file error while connecting ? Pinmemberliron.levi26-Oct-12 21:52 
QuestionThank you!! PinmemberRablinz1-Oct-12 0:46 
BugSmall DDL error in Column Names? PinmemberTomtommit29-Sep-12 5:35 
GeneralRe: Small DDL error in Column Names? Pinmemberliron.levi29-Sep-12 7:14 
QuestionWhat to put in "SQL server address" ? PinmemberAlaeddine Ghribi27-Sep-12 12:10 
AnswerRe: What to put in "SQL server address" ? Pinmemberliron.levi28-Sep-12 4:13 
GeneralRe: What to put in "SQL server address" ? PinmemberAlaa Gh28-Sep-12 5:18 
GeneralRe: What to put in "SQL server address" ? Pinmemberliron.levi28-Sep-12 6:09 
GeneralRe: What to put in "SQL server address" ? PinmemberAlaa Gh28-Sep-12 6:12 
GeneralRe: What to put in "SQL server address" ? Pinmemberliron.levi28-Sep-12 8:42 
GeneralRe: What to put in "SQL server address" ? PinmemberAlaa Gh28-Sep-12 11:26 
GeneralRe: What to put in "SQL server address" ? Pinmemberliron.levi29-Sep-12 7:13 
GeneralRe: What to put in "SQL server address" ? PinmemberAlaa Gh29-Sep-12 7:31 
QuestionThank you. PinmemberMember 942873313-Sep-12 12:56 
GeneralExcellent! PinmemberFayu5-Sep-12 10:32 
GeneralRe: Excellent! Pinmemberliron.levi5-Sep-12 10:45 
GeneralMy vote of 1 Pinmemberhassan wasef17-Aug-12 11:50 
GeneralRe: My vote of 1 Pinmemberliron.levi1-Sep-12 9:12 
GeneralRe: My vote of 1 PinmemberMohamed Abdullah 827-Sep-12 10:56 
Generalgeometry PinmemberMember 25002935-Aug-12 8:30 
QuestionProblem with "UniqueIdentifier" Data Type! PinmemberTayyab Ali Shah16-Jul-12 22:52 
Questionwitch versione of sqlite is converting to Pinmembercicco17112-Jul-12 1:56 
AnswerRe: witch versione of sqlite is converting to Pinmemberliron.levi12-Jul-12 9:57 
QuestionThank you. Worked perfectly on MSSQL v7 Pinmemberbandanashop9-Jul-12 0:13 
SuggestionConversion scheduling Pinmemberlegend83627-Jun-12 0:00 
QuestionHas anybody tried encrypting the converted SQLite DB using SQLCipher? Pinmembersmeng22-Jun-12 6:21 
GeneralMy vote of 5 Pinmembersmeng21-Jun-12 23:31 
GeneralMy vote of 5 PinmemberRichard Males20-Jun-12 10:52 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

| Advertise | Privacy | Mobile
Web03 | 2.8.140721.1 | Last Updated 14 Jan 2013
Article Copyright 2008 by liron.levi
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid