SQLite.swift in SwiftUI app will not compile - swift

Question

I'm trying to read a database and copy the rows into an array in swiftUI but I don't know the correct syntax to append the array. Here is my databaseHelper.swift
import Foundation
import SQLite
class DatabaseHelper {
var database: Connection!
var path: String
let buttonsTable = "Button"
var db: String
var english: String
var categoryID: Int
var indonesian: String
init() {
do {
let path = Bundle.main.path(forResource: "sga", ofType: "db")!
let database = try Connection(path, readonly: true)
self.database = database
print("Database initialized at path \(path)")
} catch {
print("error")
}
}
func queryDatabase() -> [ButtonData] {
var buttonVars = [ButtonData]()
do {
let buttons = try self.database.prepare(self.buttonsTable)
for user in buttons {
// print("English: \(user[self.english]), ID: \(user[self.ID]), Indonesian: \(user[self.indonesian])")
buttonVars.append(ButtonData(english: row[english], categoryID: row[categoryID], indonesian: row[indonesian]))
}
} catch {
print(error)
}
return buttonVars
}
}
struct ButtonData: Hashable {
let english: String
let categoryID: Int
let indonesian: String
}
I'm not sure what is really happening in append statement. I want to append columns in the row but it doesn't accept anything.
The error message I am getting is...
"Cannot subscript a value of type 'Statement.Element' (aka 'Array>') with an argument of type 'String'
Thanks in advance :)

Answer 1

buttonTable is a sqlite.swift table and needs to be more than a string.
At some point you need to define your table like this:
static let buttonsTable = Table("Button")
static let english = Expression<String>("english")
static let indonesian = Expression<String>("indonesian")
static let categoryID = Expression<Int>("categoryID")
Assuming your db already exists, you should then be able to access it.
This section looks correct:
init() {
do {
let path = Bundle.main.path(forResource: "sga", ofType: "db")!
let database = try Connection(path, readonly: true)
self.database = database
print("Database initialized at path \(path)")
} catch {
print("error")
}
}
But then you would access it like this:
func queryDatabase() -> [ButtonData] {
var buttonVars = [ButtonData]()
do {
let buttons = try self.database.prepare(self.buttonsTable)
for row in buttons {
buttonVars.append(ButtonData(english: row[english], categoryID: row[categoryID], indonesian: row[indonesian]))
}
} catch {
print(error)
}
return buttonVars
}
I'll often put my return stuff in a map, like this:
func queryDatabase() -> [ButtonData] {
do {
return try self.database.prepare(self.buttonsTable).compactMap { row in
ButtonData(english: row[english], categoryID: row[categoryID], indonesian: row[indonesian]))
}
} catch {
print(error)
}
// Return an empty array if we caught an error
return []
}