stephencelis/SQLite.swift

Like does not work with Russian symbols? (ICU support)

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#1025 opened on Oct 8, 2020

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help wantedquestion

Description

Hello. I use like with lowercaseString and Russian symbols but LOWER doesn't convert them to lowercase in the query. I tried to create my own function but it didn't work for me. How to solve this problem? Thanks.

// in name value: ПРИВЕТ from database let search_name = "Привет" user.filter(name.lowercaseString.like("%" + search_name.lowercased() + "%"))

Contributor guide

Tech stack
swiftsql
Domain
database
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Swift basicsSQLite queriesUnicode case insensitive comparison
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate SQLite's ICU support: by default, LOWER() only handles ASCII. The user needs a case insensitive LIKE for Cyrillic. Options include using SQLite's ICU extension (requires loading the ICU extension) or registering a custom collation. In SQLite.swift, custom functions can be added via Connection.createFunction. The user attempted this but failed. Check the GitHub issue comments for details. Also review SQLite.swift documentation on custom functions and collations. Potential fix: provide an example or modify the implementation to support Unicode case insensitive matching.