I have an iOS app that uses sqlite, the sqlite database file is preconfigured and added in xcode. Everything works great until I need to add a new table named "activities" in this sqlite file, so I added the table for the database file, replaced the database file in xcode, and now while running on either simulator or real iOS device, it keeps complaing "no such table: activities". Even if I delete the previously installed app on my device or simulator doesn't work. What is happening there? By the way, below is the code I deal with the database file everytime I instantiate my DatabaseManager:
- (instancetype)initWithDatabaseFilename:(NSString *)dbFilename {
self = [super init];
if (self) {
// Set the documents directory path to the documentsDirectory property.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
self.documentsDirectory = [paths objectAtIndex:0];
// Keep the database filename.
self.databaseFilename = dbFilename;
// Copy the database file into the documents directory if necessary.
[self copyDatabaseIntoDocumentsDirectory];
}
return self;
}
- (void)copyDatabaseIntoDocumentsDirectory {
// Check if the database file exists in the documents directory.
NSString *destinationPath = [self.documentsDirectory stringByAppendingPathComponent:self.databaseFilename];
if (![[NSFileManager defaultManager] fileExistsAtPath:destinationPath]) {
NSLog(#"file not exists");
// The database file does not exist in the documents directory, so copy it from the main bundle now.
NSString *sourcePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:self.databaseFilename];
NSError *error;
[[NSFileManager defaultManager] copyItemAtPath:sourcePath toPath:destinationPath error:&error];
// Check if any error occurred during copying and display it.
if (error != nil) {
NSLog(#"%#", [error localizedDescription]);
}
} else {
NSLog(#"file is already there");
}
}
Delete database file from document directory through terminal path generated in copyDatabaseIntoDocumentsDirectory method drag and drop database file in project.make sure tables are created through terminal.
Related
I am saving video/image in document directory.Now once the image is saved in document directory I want to save its reference in my local database.So I am thinking I can save URL of the image in the local database.
So is it constant throughout my app?
It's not constant, i have observed every time you launch the app it'll be different, but your data is moved to this new path. You can save your file name in your database, and dynamically append this file name to NSDocument directory.
- (NSString *)documentsFilePath:(NSString *)fileName {
NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docsDir = [dirPaths firstObject];
NSString *filePath = [docsDir stringByAppendingPathComponent:fileName];
return filePath;
}
- (void)storeFile:(NSString *)fileName {
NSString *filePath = [self documentsFilePath:fileName];
// create if needed
if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
// Write your data to file system here...
}
}
- (void)deleteFile:(NSString *)fileName {
NSString *filePath = [self documentsFilePath:fileName];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
NSError *deleteErr = nil;
[[NSFileManager defaultManager] removeItemAtPath:filePath error:&deleteErr];
if (deleteErr) {
NSLog(#"Can't delete %#: %#", filePath, deleteErr);
}
}
}
Please handle nil checks and store only filename in DB
No, it's not constant. Whenever your app reinstall or updated on device the document directory will change, because when app installed on device os made an directory for app with some random id and each install this random it get changed by OS.
So, you need to make it dynamic own your own, like store the file name only and append the document directory path while using it.
I would suggest only saving the filename or subdirectory/filename (if you have a subdirectory) in the database and then only attaching that to the NSDocumentDirectory.
This will ensure that you always know where the file is...
NSDocumentDirectory is however consistent accross updates, so the files should remain in the document directory even if you update...
I have an iOS app where i copy a mp3 file from the bundle to a directory within Application Support Folder (Btw same thing happens if i use the Documents folder), and later user's download more mp3 files they are also stored there. Everything works fine until an update is published (or i install another instance using Xcode during dev), where the app says the files do not exist at the path. I have tried everything and i am stumped why do my files always get deleted after an update or overwrite install using Xcode.
Here is my code:
//folder being created here
NSString *libraryPath = [[NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:#"Tracks"];
[[NSFileManager defaultManager] createDirectoryAtPath:libraryPath
withIntermediateDirectories:YES
attributes:nil
error:&error];
if (error != nil) {
NSLog(#"error creating directory: %#", error);
}
//file about to be copied
NSString *sourcePath = [[NSBundle mainBundle] pathForResource:#"Evening-Visualization-vph" ofType:#"mp3"];
libraryPath = [libraryPath stringByAppendingPathComponent:#"Evening-Visualization-vph.mp3"];
if(![[NSFileManager defaultManager] copyItemAtPath:sourcePath
toPath:libraryPath
error:&error]){
NSLog(#"Error Copying File from Bundle to Library");
}
NSURL * fileURL;
fileURL = [NSURL fileURLWithPath:libraryPath];
//file being marked so its not backed up to iCloud
if (![fileURL setResourceValue:[NSNumber numberWithBool: YES] forKey:NSURLIsExcludedFromBackupKey error:nil]) {
NSLog(#"Do not backup marked FAILED");
}
track.trackLocalPath = libraryPath;
The only solution i have left now is to manually check on each launch whether files exist at those path and mark my file list DB accordingly.
I am new to iOS development, I am making changes in an application which is using Sqlite. I am to add some new fields in some tables, I browsed DB with software and added new fields in
inventory_db_src.sqlite but when I see in emulator it uses inventory_db.sqlite which is strange as there is no inventory_db.sqlite file in solution and neither code creating DB through SQL script. And If I debug code it gets inventory_db.sqlite path successfully and never executes inventory_db_src.sqlite line and put inventory_db.sqlite in emulator where my new fields are not present as I put these in inventory_db_src.sqlite. pLease help me
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:#"inventory_db.sqlite"];
// [fileManager removeItemAtPath:dbPath error:nil];
success = [fileManager fileExistsAtPath:dbPath];
success = NO;
if (success) {
int savedVersion = [[NSUserDefaults standardUserDefaults] integerForKey:kVERSION_KEY];
if (kCURRENT_DB_VERSION != savedVersion) {
[fileManager removeItemAtPath:dbPath error:nil];
success = NO;
}
}
if (!success) {
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"inventory_db_src.sqlite"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:&error];
if (!success) {
NSAssert1(0, #"Failed to create writable database file with message '%#'.", [error localizedDescription]);
}
}
_INVENTORY_DB = [[FMDatabase alloc] initWithPath:dbPath];
Line 6 in your code above is showing the name as inventory_db.sqlite, so that is the file your app will be using. You need to modify that to use the new database name. Be aware, that by modifying your database, you might have unexpected results so you will need to manage what DB version your app is using and make data corrections as needed. This is one nice feature that Core Data can assist in.
According to your statement it seems that old DB is cached in to your Emulator. please reset you Emulator by
iOS Simulator -> Reset content and settings
And it should work ...
I have a bunch of images stored in an images directory within my Supported Files directory in Xcode. I want to be able to show one of those images. What is the best way to obtain a path to that image? Do I have to copy them to the Documents directory first? If so, how can I do that?
EDIT: I've tried the following to copy the image from Supporting Files to the Documents folder in the app. It successfully copies, but I can't get the image to show:
-(void)findImage:(NSString *)imageName
{
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *appImagePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.jpg",imageName]];
success = [fileManager fileExistsAtPath:appImagePath];
if (success)
{
return;
}
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultImagePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.jpg",imageName]];
success = [fileManager copyItemAtPath:defaultImagePath toPath:appImagePath error:&error];
if (!success)
{
NSAssert1(0, #"Failed to create writable database file with message '%#'.", [error localizedDescription]);
}
self.imageDisplay.image = [UIImage imageNamed:appImagePath];
return;
}
This should do the trick:
[UIImage imageNamed:#"someImageName"];
EDIT:
Some additional information:
-imageNamed: will look through the entire main bundle of the application for an imagefile (preferrably an png) with the filename of "someImageName". You need not worry about its location or its extension, since it will be searched for in the mainbundle. Files that you import through the import-file-dialogue in xcode will be added to he main bundle.
This means:
If i have imported a file called myImage.png, calling [UIImage imageNamed:#"myImage"];from anywhere in my code will get me a UIImage-Object containing that image. Its amazingly simple, and maybe that startled you a bit ;)
Look it up in the docs if you like:
http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImage_Class/Reference/Reference.html
I have a weird problem. My app works fine on my device but the sqlite database does not work on the simulator. The file "database.sqlite" exists in the same folder as my apps, it has the same name and the columns names are also correct.
So I assume there is something wrong with the configuration but I don't know what. Can someone please help me out.
Thanks
Here are some posts that seem to address the problem : http://forums.macrumors.com/showthread.php?t=484899
One reason might be because you should ensure the database is copied from your Supporting Files application directory (read only) to library or documents before you use it. Here's an ensurePrepared function from a sample of mine that uses sqlite that does just that. In this case, it's called contacts.db
- (BOOL)ensureDatabasePrepared: (NSError **)error
{
// already prepared
if ((_dbPath != nil) &&
([[NSFileManager defaultManager] fileExistsAtPath:_dbPath]))
{
return YES;
}
// db in main bundle - cant edit. copy to library if !exist
NSString *dbTemplatePath = [[NSBundle mainBundle] pathForResource:#"contacts" ofType:#"db"];
NSLog(#"%#", dbTemplatePath);
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
_dbPath = [libraryPath stringByAppendingPathComponent:#"contacts.db"];
NSLog(#"dbPath: %#", _dbPath);
// copy db from template to library
if (![[NSFileManager defaultManager] fileExistsAtPath:_dbPath])
{
NSLog(#"db not exists");
NSError *error = nil;
if (![[NSFileManager defaultManager] copyItemAtPath:dbTemplatePath toPath:_dbPath error:&error])
{
return NO;
}
NSLog(#"copied");
}
return YES;
}