Strings loaded from sqlite database leading to out of scope objects - iphone

Question

I have a database manager which successfully loads a string from my sqlite database, and then uses it to create an object. I add multiple of these objects to an array and return it to which ever class I'm calling it from.
I have no problem using the returned array in the method I call it from, but when other methods in the class try to access it, the string element is out of scope.
Here is my relavent code.
In DBManager.m:
-(NSArray *)loadObjectData {
NSMutableArray *myArray = [[NSMutableArray alloc] init];
//prepare query and statement
NSString *query = [NSString stringWithFormat:#"SELECT * FROM object;"];
sqlite3_stmt *statement;
//perform query
if (sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, nil) != SQLITE_OK)
NSLog(#"Prepare Error. '%s'", sqlite3_errmsg(database));
//get data
while (sqlite3_step(statement) == SQLITE_ROW) {
//read values
int anInt = sqlite3_column_int(statement, 0);
NSString *aString = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 1)];
//add new object to list
[myArray addObject:[[Object alloc] initWithID:anInt Name:aString]];
}
if(sqlite3_finalize(statement) != SQLITE_OK)
NSLog(#"Finalize statement error.");
return [myArray autorelease];
}
In XViewController.h:
NSArray *listData;
SessionData *sessionData;
#property (nonatomic, retain) NSArray *listData;
#property (nonatomic, retain) SessionData *sessionData;
In XViewController.m:
- (void)viewDidLoad
{
dbMan = [DBManager sharedDBMananager]; //its a singleton
//Load objects to display in table
self.listData = [dbMan loadObjectData];
//if i try to use listData here, it works fine.
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//normal stuff cut out
// Configure the cell...
//the following line fails because the string in the object out of scope
cell.textLabel.text = [[listData objectAtIndex:[indexPath row]] aString];
//trying to access [[listData objectAtIndex:[indexPath row]] anInt] works fine though.
return cell;
}
If I replace the line (in my loadObjectData method):
NSString *aString = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 2)];
with this:
NSString *aString = #"String";
everything works fine.

Answer 1

Take a look at this question's accepted answer - What does assigning a literal string to an NSString with "=" actually do?
The string literal ( #"String" ) works because it is statically allocated and does not need to be retained/released. [NSString stringWithUTF8String:] creates an autoreleased string. If you are not retaining it in your initWithID:Name: method then it is being released which is why your code isn't working. In your initWithID:Name: method at a retain when you reassign the name to your object's instance variable.

Answer 2

In Object class have you retained this string if not then i think you should and release this string in dealloc