Saving UIImage as Blob SQLite - ios

Question

I have the following code that pushes information to a database. It gives a successful insert but the "canvas" column (the one that contains the image blob) is NULL. I have modeled my use of sqlite3_prepare_v2 and sqlite3_bind_blob after other answers that I've been looking at on StackOverflow.
-(void) sendMoment: (Album *) alb moment:(Moment *) m
{
#try {
NSFileManager *fileMgr = [NSFileManager defaultManager];
// First, test for existence of writable file:
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:#"pictures.sqlite"];
BOOL success = [fileMgr fileExistsAtPath:writableDBPath];
if (!success){
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"pictures.sqlite"];
success = [fileMgr copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
if (!success) {
NSAssert1(0, #"Failed to create writable database file with message '%#'.", [error localizedDescription]);
}
}
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:#"yyy-MM-dd HH:mm:ss"];
NSString *dateString = [dateFormat stringFromDate: m.timestamp];
//add passed-in moment to the given album
sqlite3_stmt *sqlStatement;
NSData *imageData = UIImageJPEGRepresentation([m.moment firstObject], 1.0);
NSString *deleteSQL = [NSString stringWithFormat:#"DELETE FROM MomentTbl WHERE user = \"t-amkruz\""];
NSString *momentInsertSQL = [NSString stringWithFormat:#"INSERT INTO MomentTbl (momentID, albumID, title, timestamp, author, latitude, longitude, canvas) VALUES (NULL, %d, '%#', '%#', '%#', '%#', '%#', ?)", alb.ID, alb.title, dateString, #"user", m.latitude, m.longitude];
const char *query_stmt = [momentInsertSQL UTF8String];
const char *dbPath = [writableDBPath UTF8String];
int result = sqlite3_open(dbPath, &db);
if (SQLITE_OK == result) {
char *errInfo = nil;
sqlite3_prepare_v2(db, query_stmt, -1, &sqlStatement, NULL);
sqlite3_bind_blob(sqlStatement, 1, [imageData bytes], [imageData length], SQLITE_TRANSIENT);
result = sqlite3_exec(db, query_stmt, nil, nil, &errInfo);
if (SQLITE_OK == result) {
NSLog(#"Sucessful insert");
} else {
NSLog(#"Insert failed");
}
sqlite3_close(db);
}
else {
NSLog(#"Could not open database");
}
}
#catch (NSException *exception) {
NSLog(#"An exception occured: %#", [exception reason]);
}
}
Again, the only part that I have any problems with is the last column; values from every other column insert correctly. I've verified that imageData is non-nil. The prepare_v2 statement and the bind_blob statement both return 0 when I check them with NSLog. I would really appreciate help!

Answer 1

Turns out that I needed to replace the exec statement (and subsequent if statement) with the following:
if(sqlite3_step(sqlStatement) == SQLITE_OK){
NSLog(#"Sucessful insert");
}
else {
NSLog(#"Insert failed");
}
Hope this helps someone else.