error Domain=FMDatabase Code=8 "attempt to write a readonly database" - ios

Question

I'm using FMDatabase library to used prepped database sqlite.
I got this error:
Error Domain=FMDatabase Code=8 "attempt to write a readonly database" UserInfo={NSLocalizedDescription=attempt to write a readonly database}
2017-10-27 19:59:10.983238+0330 kashanmap[417:63718] Unknown error calling sqlite3_step (8: attempt to write a readonly database) eu
2017-10-27 19:59:10.983473+0330 kashanmap[417:63718] DB Query: insert into LocationInfoFa
it's my class:
import FMDB
class DatabaseManager {
private let dbFileName = "kashanmapDB_upgrade_3-4.db"
private var database:FMDatabase!
let TABLE_LOCATION_FA = "LocationInfoFa";
let TABLE_LOCATION_EN = "LocationInfoEn";
let TABLE_GREAT_PEOPLE_FA = "GreatPeopleInfoFa";
let TABLE_GREAT_PEOPLE_EN = "GreatPeopleInfoEn";
let TABLE_TAGS = "Tags";
let TABLE_RELATION_TAG_LOCATION = "RelationTagLocation";
let TABLE_NECESSARY_INFORMATION = "NecessaryInformation";
let TABLE_SLIDER_FA = "SliderFa";
let TABLE_SLIDER_EN = "SliderEn";
let DATABASE_VERSION = 4;
static var LANGUAGE = 1 ; //1:Fa , 2:En
var utilities = Utilities()
init() {
openDatabase()
if(utilities.getData(key: "lang") == "2")
{
DatabaseManager.LANGUAGE = 2
}
}
func openDatabase() {
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let dbPath = URL(fileURLWithPath: paths).appendingPathComponent(dbFileName)
let str_path = Bundle.main.resourceURL!.appendingPathComponent(dbFileName).path
let database = FMDatabase(path: str_path)
/* Open database read-only. */
if (!(database.open(withFlags: 2))) {
print("Could not open database at \(dbPath).")
} else {
print("opened database")
self.database = database;
}
}
func closeDatabase() {
if (database != nil) {
database.close()
}
}
path of my database:
my query:
do {
let db = database
let q = try db?.executeUpdate("insert into \(table) (catid,subcat_id,id,subcat_title,title,description,lat,lon,takhfif,images,wifi,apple_health,wc,full_time,pos,work_hours,phone,mobile,fax,website,email,address,facebook,instagram,linkedin,telegram,googleplus,twitter,publish,feature,manager,city,rating_sum,rate_count,lastip,parking,isMallID,mallID,discount_images,price_images,newProduct_images,services_images,order_online,out_upon,cat_title,cat_icon,last_modify,item_logo,cat_logo,rate_sum1,rate_sum2,rate_sum3,rate_count1,rate_count2,rate_count3,rate_title1,rate_title2,rate_title3,rate_enable,installments_text,installments_image) values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)", values:[ catid,subcat_id,id,subcat_title,title,description,lat,lon,takhfif,images,wifi,apple_health,wc,full_time,pos,work_hours,phone,mobile,fax,website,email,address,facebook,instagram,linkedin,telegram,googleplus,twitter,publish,feature,manager,city,rating_sum,rate_count,lastip,parking,isMallID,mallID,discount_images,price_images,newProduct_images,services_images,order_online,out_upon,cat_title,cat_icon,last_modify,item_logo,cat_logo,rate_sum1,rate_sum2,rate_sum3,rate_count1,rate_count2,rate_count3,rate_title1,rate_title2,rate_title3,rate_enable,installments_text,installments_image])
} catch {
print("\(error)")
}
there are some solutions in stack overflow but them don't accepted as true answer.
updated2
I got this error:
DB does not exist in documents folder
my code:
init() {
openDatabase()
if(utilities.getData(key: "lang") == "2")
{
DatabaseManager.LANGUAGE = 2
}
}
func copyDatabaseIfNeeded() {
// Move database file from bundle to documents folder
let fileManager = FileManager.default
let documentsUrl = fileManager.urls(for: .documentDirectory,
in: .userDomainMask)
guard documentsUrl.count != 0 else {
return // Could not find documents URL
}
let finalDatabaseURL = documentsUrl.first!.appendingPathComponent("kashanmapDB_upgrade_3-4.db")
if !( (try? finalDatabaseURL.checkResourceIsReachable()) ?? false) {
print("DB does not exist in documents folder")
let documentsURL = Bundle.main.resourceURL?.appendingPathComponent("kashanmapDB_upgrade_3-4.db")
do {
try fileManager.copyItem(atPath: (documentsURL?.path)!, toPath: finalDatabaseURL.path)
} catch let error as NSError {
print("Couldn't copy file to final location! Error:\(error.description)")
}
} else {
print("Database file found at path: \(finalDatabaseURL.path)")
}
}
func openDatabase() {
self.copyDatabaseIfNeeded()
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let dbPath = URL(fileURLWithPath: paths).appendingPathComponent(dbFileName)
let str_path = Bundle.main.resourceURL!.appendingPathComponent(dbFileName).path
let database = FMDatabase(path: str_path)
/* Open database read-only. */
if (!(database.open(withFlags: 2))) {
print("Could not open database at \(dbPath).")
} else {
print("opened database")
self.database = database;
}
}

Answer 1

You are facing this error because you are trying to write (update) the .db file in the bundle directory which is not allowed:
AppName.app:
This is the app’s bundle. This directory contains the app and all of
its resources. You cannot write to this directory. To prevent
tampering, the bundle directory is signed at installation time.
Writing to this directory changes the signature and prevents your app
from launching. You can, however, gain read-only access to any
resources stored in the apps bundle.
File System Basics - Table 1-1: Commonly used directories of an iOS app
If you are aiming to update the file, you should implement a logic to copy it -if it's not already has been copied before- into the documents directory, thus you'd be able to read/write transactions with the copied file.
Remark that for iOS 11 and above, you might want to copy the database file into the Application Support directory if you don't want to let be viewable to the end users when navigating to your app by the Files iOS app. For details, check the iOS Storage Best Practices Apple video session.
You'd notice that this logic should be applied to any file in the app main bundle, for instance it is also applicable for JSON files.