SQLite Swift db.prepare Optional() in statement values - sqlite.swift

Question

In the SQLite Swift documentation there is reference to getting statement results directly. I have a lot of SQL queries prepared and I don't really want to refactor them. I would sooner use them as they are using db.prepare, as per below.
Statements with results may be iterated over.
let stmt = try db.prepare("SELECT id, email FROM users")
for row in stmt {
print("id: \(row[0]), email: \(row[1])")
// id: Optional(1), email: Optional("alice#mac.com")
}
The return values always have the "Optional()" around them. Is there a way we can just get the raw row values back without this?

Answer 1

Unwrap the values using ! after the variable as #stephencelis said:
let stmt = try db.prepare("SELECT id, email FROM users")
for row in stmt {
print("id: \(row[0]!), email: \(row[1]!)")
}

Answer 2

You may want to use https://github.com/groue/GRDB.swift. It lets you extract optionals or non-optionals, just as you wish:
for row in Row.fetch(db, "SELECT id, email FROM users") {
let id: Int64 = row.value(atIndex: 0)
let email: String = row.value(atIndex: 1)
print(id, email)
}

Answer 3

The type-safe API lets you declare expressions of non-optional types that, when pulled back from a statement, are not wrapped.
From the README:
let users = Table("users")
let id = Expression<Int64>("id")
let name = Expression<String?>("name")
let email = Expression<String>("email")
try db.run(users.create { t in
t.column(id, primaryKey: true)
t.column(name)
t.column(email, unique: true)
})
// CREATE TABLE "users" (
// "id" INTEGER PRIMARY KEY NOT NULL,
// "name" TEXT,
// "email" TEXT NOT NULL UNIQUE
// )
let insert = users.insert(name <- "Alice", email <- "alice#mac.com")
let rowid = try db.run(insert)
// INSERT INTO "users" ("name", "email") VALUES ('Alice', 'alice#mac.com')
for user in db.prepare(users) {
println("id: \(user[id]), name: \(user[name]), email: \(user[email])")
// id: 1, name: Optional("Alice"), email: alice#mac.com
}
Note that both id and email, which are non-optional, are returned as such.