iOS - 如何使用SQLite.swift進行變音不敏感搜索？

Question

我正在使用SQLite.swift。 有沒有辦法在SQLite中做一個不符號的LIKE查詢？例如，下面的查詢：

SELECT * FROM users WHERE name LIKE "thu%" 

將返回：

thử 
thu 
thư 
etc. 

Answer 1

從the documentation：

We can create custom collating sequences by calling createCollation on a database connection.

try db.createCollation("NODIACRITIC") { lhs, rhs in 
    return lhs.compare(rhs, options: .DiacriticInsensitiveSearch) 
} 

We can reference a custom collation using the Custom member of the Collation enumeration.

restaurants.order(collate(.Custom("NODIACRITIC"), name)) 
// SELECT * FROM "restaurants" ORDER BY "name" COLLATE "NODIACRITIC" 

在你的情況，你可以執行事後以下查詢：

SELECT * FROM users WHERE name COLLATE NODIACRITIC LIKE 'thu%'