Download sqlite database from URL - objective-c

Question

I'm using this code the load the local sqlite database.
- (id)init
{
self = [super init];
if (self) {
NSString *path = [[NSBundle mainBundle] pathForResource:#"db" ofType:#"sqlite3"];
_db = [[MDDatabase alloc] initWithPath:path];
_HTMLRenderer = [[MDHTMLRenderer alloc] init];
}
return self;
}
I would like to put the database online and let the app download the database instead. I changed the code to:
NSData *dbFile = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://www.someurl.com/DatabaseName.sqlite"]];
NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:#"Documents"]];
NSString *filePath = [resourceDocPath stringByAppendingPathComponent:#"Database.sqlite"];
[dbFile writeToFile:filePath atomically:YES];
_db = [[MDDatabase alloc] initWithPath:filePath];
_HTMLRenderer = [[MDHTMLRenderer alloc] init];
Editted:
I changed my code to follow but it's crashed.
- (id)init
{
self = [super init];
if (self) {
[self performSelectorOnMainThread:#selector(downalod) withObject:nil waitUntilDone:YES];
NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:#"Documents"]];
NSString *filePath = [resourceDocPath stringByAppendingPathComponent:#"Database.sqlite"];
_db = [[MDDatabase alloc] initWithPath:filePath];
_HTMLRenderer = [[MDHTMLRenderer alloc] init];
}
return self;
}
-(void)download
{
NSData *dbFile = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:#"http://www.someurl.com/DatabaseName.sqlite"]];
NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:#"Documents"]];
NSString *filePath = [resourceDocPath stringByAppendingPathComponent:#"Database.sqlite"];
[dbFile writeToFile:filePath atomically:YES];
}

Answer 1

You have problem in your file. Check with correct url. Its an encoding issue. Try with this (It will work) : http://spaceflight.nasa.gov/gallery/images/apollo/apollo17/hires/s72-55482.jpg
Add App Transport Security Settings (Allow Arbitrary Loads YES) in your plist.
Enable background mode.
Declare this macro in .m
#define DocumentsDirectory [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]
Now call and you will have the file in your local.
Call like:
[self performSelectorOnMainThread:#selector(downalod) withObject:nil waitUntilDone:NO];
_db = [[MDDatabase alloc] initWithPath:filePath];
_HTMLRenderer = [[MDHTMLRenderer alloc] init];
-(void)download
{
NSString *stringURL =[NSString stringWithFormat: #"url"];
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:#"%#",[stringURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSString *filePath = [DocumentsDirectory stringByAppendingPathComponent:[url lastPathComponent]];
NSLog(#"success--222,%#", filePath);
[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
{
NSLog(#"success--222,%#", filePath);
if (error)
{
NSLog(#"success--not---Error,%#", [error localizedDescription]);
}
else
{
NSLog(#"success--yes... %#", [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]);
[data writeToFile:filePath atomically:YES];
}
}];
}

Answer 2

After long time search, finally I solved it myself:
- (id)init
{
self = [super init];
if (self) {
NSData *fetchedData = [NSData dataWithContentsOfURL:[NSURL URLWithString:#"http://www.someurl.com/db.sqlite3"]];
NSString *documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [documentsPath stringByAppendingPathComponent:#"db.sqlite3"];
[fetchedData writeToFile:filePath atomically:YES];
_db = [[MDDatabase alloc] initWithPath:filePath];
_HTMLRenderer = [[MDHTMLRenderer alloc] init];
}
return self;
}