gerhobbelt / sqlean

The ultimate set of SQLite extensions

All the missing SQLite functions

SQLite has few functions compared to other database management systems. SQLite authors see this as a feature rather than a problem, because SQLite has an extension mechanism in place.

There are a lot of SQLite extensions out there, but they are incomplete, inconsistent and scattered across the internet. sqlean brings them together, neatly packaged into domain modules, documented, tested, and built for Linux, Windows and macOS.

We do not try to gather all the existing extensions into one giant pile — that would not be very useful. The goal is to create a well-thought set of domain modules with a convenient API. A kind of standard library for SQLite.

To achieve it, we split extensions that are too broad, merge the ones that are too narrow, refactor, add missing features, test, document, and do a ton of other small things.

The main set

These are the most popular functions. They are tested, documented and organized into the domain modules with clear API.

Think of them as the extended standard library for SQLite:

• crypto: secure hashes
• fileio: read and write files
• fuzzy: fuzzy string matching and phonetics
• ipaddr: IP address manipulation
• json1: JSON functions
• math: math functions
• re: regular expressions
• stats: math statistics
• text: string functions
• unicode: Unicode support
• uuid: Universally Unique IDentifiers
• vsv: CSV files as virtual tables

The incubator

These extensions haven't yet made their way to the main set. They may be untested, poorly documented, too broad, too narrow, or without a well-thought API.

Think of them as candidates for the standard library:

• array: one-dimensional arrays
• besttype: convert string value to numeric
• bloom: a fast way to tell if a value is already in a table
• btreeinfo, memstat, recsize and stmt: various database introspection features
• cbrt and math2: additional math functions and bit arithmetics
• classifier: binary classifier via logistic regression
• closure: navigate hierarchic tables with parent/child relationships
• compress and sqlar: compress / uncompress data
• cron: match dates against cron patterns
• dbdump: export database as SQL
• decimal, fcmp and ieee754: decimal and floating-point arithmetic
• define: create scalar and table-valued functions from SQL
• envfuncs: read environment variables
• eval: run arbitrary SQL statements
• isodate: additional date and time functions
• pearson: Pearson correlation coefficient between two data sets
• pivotvtab: pivot tables
• prefixes: generate string prefixes
• rotate: string obfuscation
• spellfix: search a large vocabulary for close matches
• stats2 and stats3: additional math statistics functions
• text2: additional string functions
• uint: natural string sorting and comparison
• unhex: reverse for hex()
• unionvtab: union similar tables into one
• xmltojson: convert XML to JSON string
• zipfile: read and write zip files
• zorder: map multidimensional data to a single dimension

Vote for your favorites! We'll refactor and merge popular ones into the main set.

Download

There are precompiled binaries for every OS:

• *.dll - for Windows
• *.so - for Linux
• *.dylib - for macOS

Binaries are 64-bit and require a 64-bit SQLite version. If you are using SQLite shell on Windows (sqlite.exe), its 64-bit version is available at https://github.com/nalgeon/sqlite.

Incubator extensions are also available.

Usage

CLI usage:

sqlite> .load ./stats
sqlite> select median(value) from generate_series(1, 99);

IDE usage:

select load_extension('c:\Users\anton\sqlite\stats.dll');
select median(value) from generate_series(1, 99);

In-app usage:

import sqlite3

connection = sqlite3.connect(":memory:")
connection.enable_load_extension(True)
connection.load_extension("./stats.so")
connection.execute("select median(value) from generate_series(1, 99)")
connection.close()

You can specify any other supported extension instead of stats.

Contributing

Contributions are welcome! Submit your own or third-party extension to the incubator:

• How to submit your extension
• How to submit a third-party extension

We want every extension to be self-contained. So we limit the project scope to extensions without external dependencies (other than the C standard library and SQLite itself).

Please note that we only accept extensions with permissive licenses (MIT License, Apache License etc) or public domain. Copyleft licenses like GPL won't do.

License

Copyright 2021+ Anton Zhiyanov, Contributors and Third-party Authors.

The software is available under the MIT License.

Stay tuned

Follow @ohmypy on Twitter to keep up with new features 🚀