[ios] Copy sqlite db from main bundle

gistfile1.h

NSString* docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString* dbPath = [docPath stringByAppendingPathComponent:@"mydatabase.db"];
NSFileManager *fm = [NSFileManager defaultManager];

// Check if the database is existed.
if(![fm fileExistsAtPath:dbPath])
{
	// If database is not existed, copy from the database template in the bundle            
	NSString* dbTemplatePath = [[NSBundle mainBundle] pathForResource:@"mydatabase" ofType:@"db"];
	NSError* error = nil;    
	[fm copyItemAtPath:dbTemplatePath toPath:dbPath error:&error];
	if(error){
		NSLog(@"can't copy db template.");
		assert(false);        
	}
}