Proper way to make a case-insensitive query on a string column?

I have an entity with a string column, and I’m importing external data into the table. I want to be able to do a case-insensitive query against the column, because it’s based on user input.

I’d like to know if there’s a way other than normalizing my data in the db to lowercase (which would be inconvenient because I need to display this string back to the user in its original case) and user query.

I’m using a Repository.find({stringColumn: userInput}) to fetch my data.

[manuhortet]

For those using postgres, the ILIKE operator perform case insensitive queries:

Entity.find({
    where: `"column" ILIKE 'keyword'` 
});

* Notice I’m using " " to specify the column and ' ' to specify the searched keyword. Double quotes are used for quoted identifiers and single quotes for string literals

This open issue is about including the ILIKE operator as a typeorm advanced option, which would be the ideal solution for postgres users.

[pleerock]

I guess you need something like this:

SELECT * FROM `post` WHERE LOWER(`title`) = LOWER("some title")

Can you try to do it following way:

const posts = await repository.createQueryBuilder("post")
     .where("LOWER(post.title) = LOWER(:title)", { title })
     .getMany();