Exception thrown with SQLite result from Column with NULL value

Question

Hi,

when selecting a column that can contains a NULL value I get an exception thrown on this statement.

self.DirectionFromCity = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 8)];

How should I go about setting these attributes as NULL values are OK for the Database.

Answer 1

As per docs NSString throws an exception if the bytes are null

What you need to do is check the returned value and only create the string if it is not null

char *localityChars = sqlite3_column_text(compiledStatement, 8);

if (localityChars == nil) {
     self.DirectionFromCity = nil;
} else {
     self.DirectionFromCity = [NSString stringWithUTF8String: localityChars];
}

In response to the comment below re code growing with the extra checking, you can shrink it down using

self.DirectionFromCity = localityChars != nil?[NSString stringWithUTF8String: localityChars]:nil;

or push it out to a method that will do the same functionality

self.DirectionFromCity = [self getSQLiteColumn:compiledStatement];