NSDocumentDirectory giving strange directory as output - objective-c

Question

I'm trying to open sqlite database from my documents directory:
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *dbFileName = [docDir stringByAppendingPathComponent:#"DatabaseName.sqlite"];
self.db = [FMDatabase databaseWithPath:dbFileName];
self.db.logsErrors = YES;
self.db = _db;
if ([self.db open]) {
NSLog(#"database opened");
}
NSLog(#"docDir = %#",[NSString stringWithFormat:#"%#%#",docDir,dbFileName]);
NSLog shows strange path docDir = /Users/userName/Documents/Users/userName/Documents/DatabaseName.sqlite instead of /Users/userName/Documents/DatabaseName.sqlite. While opening there are no errors or warnings.
After this I tried get count(*) from my table
NSString *queryString = [NSString stringWithFormat:#"SELECT count(*) FROM histories"];
FMResultSet *result = [self.db executeQuery:queryString];
NSLog(#"count = %i", [result intForColumnIndex:0]);
Database has more when 10k rows but NSLog shows 0. Application is not for iOS, only Command Line. Where can I find the problem?

Answer 1

You have
docDir = /Users/userName/Documents
dbFileName = /Users/userName/Documents/DatabaseName.sqlite
therefore in
NSLog(#"docDir = %#",[NSString stringWithFormat:#"%#%#",docDir,dbFileName]);
the docDir is printed twice (dbFileName already contains docDir).
Remark: The statement self.db = _db; looks suspicious, you might want to remove that.
Added: The FMDB documentation states:
You must always invoke -[FMResultSet next] before attempting to access
the values returned in a query, even if you're only expecting one.
So your code probably should look like this:
FMResultSet *result = [self.db executeQuery:queryString];
if ([result next]) {
NSLog(#"count = %i", [result intForColumnIndex:0]);
}