如何使 LIKE 子句不区分大小写? [英] How to make LIKE clause case-insensitive?

问题描述

我在 Ruby On Rails 中使用了 LIKE 子句.当我尝试通过键入 "more" 来搜索记录时，它不会返回任何内容，但是当我使用 "More" 进行搜索时，它会返回包含 More 关键字，因此它的行为似乎区分大小写.

I'm using a LIKE clause in Ruby On Rails. When I try to search for records by typing "more" it doesn't return anything, but when I do with "More", then it returns the records which contains More keyword, so it seems like it behaves in a case-sensitive way.

是否可以不区分大小写?

Is it possible to make this case-insensitive?

这是我目前使用的查询:

Here is the query I am using currently:

Job.where('title LIKE ? OR duration LIKE ?', "%#{params[:search]}%", "%#{params[:search]}%")

推荐答案

我假设您正在使用 Postgres.

I assume you're using Postgres.

您可以使用 ILIKE

Job.where('title ILIKE ? OR duration ILIKE ?', "%#{params[:search]}%", "%#{params[:search]}%")

或者一些棘手的黑客lower():

Job.where('lower(title) LIKE lower(?) OR lower(duration) LIKE lower(?)', "%#{params[:search]}%", "%#{params[:search]}%")

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