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I would like to compare Sqlite databases with each other, both schema and data. I know that a rather crude method exists by comparing the database dumps with each other. But are ther any other methods as well? Especially from a command line environment. I know several tools for comparing databases exist, and I would like to know what sort of methodology they use.

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You want want to ask this over at DBA.SE instead. Maybe they have some interesting suggestions as well. –  haylem Jul 7 '12 at 18:26

4 Answers 4

If you only need rough precision, the dump method is crude but does get the job done.

If you want a lot of precision, I have done a similar task using Python's SQLite module. (http://docs.python.org/library/sqlite3.html) I grabbed and directly compared alike rows in each table and wrote out changes to a file, with further post-comparison and UPDATEs done after all comparison was done. You can do similar comparisons with the schema for each "*.db" file.

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RedGate offers a suite of tools to help with DB comparisons: http://www.red-gate.com/products/sql-development/sql-compare/

There is a tool to compare schemas from different DB's as well as a tool to compare the data from tables or from the result of a query. We use the data compare tool every time we update our database to ensure that queries often done by our product code return the same data in the same order, etc.

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I already know that tool, but I can't use it. I'm in a command line environment and cannot rely on existing tools and packages. What I'd really like to know is that methodology or technique it may possibly use in comparing dbs. –  Apophenia Overload Jul 6 '12 at 20:13
    
RedGate Sql Compare and Sql Data Compare do not work with SQLite –  Brent Jul 22 at 19:00

RedGate Sql Compare and Sql Data Compare do not work on SQLite unfortunately.

SQLite Compare Utility http://www.codeproject.com/Articles/220018/SQLite-Compare-Utility works decent for schema differences, but wasn't very helpful for data differences in my situation.

I would give my arm if Beyond Compare added support for Sql Server and SQLite comparison.

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Try using SchemaCrawler. SchemaCrawler is a free and open-source command-line tool that produces text (text, JSON, CSV, HTML) output that is designed to be diff-ed, using standard diff tools. It can compare both structure and data.

Sualeh Fatehi, SchemaCrawler

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Sualeh, thank you for disclosing your connection to SchemaCrawler. Not everyone does this. –  Kate Paulk Sep 22 at 11:00
    
One thing I will note is that this post is identical to another post. The posts appear to be perfectly legitimate, just be careful about copy/pasting =) That being said, Kate is being polite. In reality, almost no one does it... I would venture to say 4 of every 5 warnings issued are for undisclosed astroturfing, so it is certainly refreshing to see someone being honest about their affiliations! –  corsiKa Sep 22 at 23:41

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