1/12/2023 0 Comments Sqlite stored procedures![]() ![]() Since that scripting language almost certainly has a SQLite binding, you could then recursively define SQLite extension functions in the scripting language! as opposed to adding some SQL to a database.Įmbed your favorite scripting language into your app, then write the script chunks in that language, store them in the DB, and then execute them. It is therefore fast to make hundreds of individual queries. With SQLite, database calls are on the order of single-digit nanoseconds away, six orders of magnitude faster. Every round trip costs something on the order of milliseconds purely because of the network overhead, so you have a strong incentive to bundle up a bunch of operations on the server side to amortize that overhead over multiple SQL statements. I'm finding that feature (of MariaDB) incredibly useful.Ī huge reason why all of the major client-server RDBMSes have stored procedures is because they are client-server systems. Stored functions flip that, screwing up one of the primary value propositions of SQL, usually doing so with a terrible programming language on top of that. SQL isn't imperative, it's declarative: you say what you want accomplished, not how it must be accomplished. Since 'triggers' are essentially stored functions. You can create a loadable extension for this. This does add some deployment work: you will have to deploy the additional dll/ so/ dylib files with your application.Not "changing:" writing. This is easier and less work than you might think!Ī step-by-step guide is at. Compile short single-page C programs to program arbitrary functions.So you can do most things you would normally do with stored procs.įor how to program functions in a SQL View see. Create a View over a Recursive CTE to program arbitrary functions in pure SQL queries. ![]() Create temporary one-row tables called e.g.It would require two queries: first to INSERT data into the fake-sp-trigger-table, and the second to SELECT from the fake-sp-results-table, which could be empty, or have a message-field if something went wrong. temp) table (with name related to the fake-sp) to contain those results. The dedicated table rows contain the parameters for your fake sp, and if it needs to return results you can have a second (poss. Yet, it is possible to fake it using a dedicated table, named for your fake-sp, with an AFTER INSERT trigger. You can find the details at his blog post: Adding Stored Procedures to SQLite If you are still interested, Chris Wolf made a prototype implementation of SQLite with Stored Procedures. I've done this in C# using DevArt's SQLite to implement password hashing. You can then use these custom functions as part of any SQLite select/update/insert/delete. You can however extend SQLite with your own user defined functions in the host language (PHP, Python, Perl, C#, Javascript, Ruby etc). So it makes more sense to implement all your business logic including what would have been SP code in the host language. This makes sense for database engines designed to work as a network connected service but the imperative for SQLite is much less given that it runs as a DLL in your application process rather than in a separate SQL engine process. I think a key reason for having stored procs in a database is that you're executing SP code in the same process as the SQL engine. Source : Appropriate Uses For SQLite Solution 2 SQLite has had to sacrifice other characteristics that some people find useful, such as high concurrency, fine-grained access control, a rich set of built-in functions, stored procedures, esoteric SQL language features, XML and/or Java extensions, tera- or peta-byte scalability, and so forth
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