FMDB not inserting into DB - iphone

Question

I am trying to use FMDB to insert a few queries into the DB.
When I check the query for insert it is saying that it is inserting.
Later I can actually read the data from the Tables.
But what happens is that if I try to read the information from the DB, it comes back as null. When I checked the DB in the Xcode Project, not seems to have updated.
It kind of confusing me. Any suggestion what the problem could be?

Answer 1

Your code is wrong. This is what I use to write:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:#"db.sqlite"];
FMDatabase *db = [FMDatabase databaseWithPath:dbPath];
[db open];
[db executeUpdate:#"INSERT INTO foo (bar) VALUES (?)", bar];
[db close];
And to read:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:#"db.sqlite"];
FMDatabase *db = [FMDatabase databaseWithPath:dbPath];
[db open];
NSMutableArray *bar = [[[NSMutableArray alloc] init] autorelease];
FMResultSet *s = [db executeQuery:#"select * from foo"];
while ([s next]) {
[bar addObject:[s stringForColumn:#"bar"]];
}
NSLog(#"%#", bar);
[db close];
Also checkout where I located the db. I think doing your way will work on simulator but not on the device because of sandboxing and all.
Good luck!
EDIT:
Put this in your app delegate:
- (void)createEditableCopyOfDatabaseIfNeeded {
// First, test for existence.
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:#"db.sqlite"];
success = [fileManager fileExistsAtPath:writableDBPath];
if (success) return;
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"db.sqlite"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success) {
NSAssert1(0, #"Failed to create writable database file with message '%#'.", [error localizedDescription]);
}
}
And run that method from application:didFinishLaunchingWithOptions with:
[self performSelector:#selector(createEditableCopyOfDatabaseIfNeeded) withObject:nil];
Be sure that you put your database in your projecttree first.