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- (id)valueForUndefinedKey:(NSString *)name { NSArray * extra = [[self extras] allObjects]; for (int idx = 0; idx < [extra count]; idx++) { if ([name isEqualToString:[[extra objectAtIndex:idx] valueForKey:@"name"]]) { return [[extra objectAtIndex:idx] valueForKey:@"value"]; } } return nil; } - (void)setValue:(id)value forUndefinedKey:(NSString *)name { // Look for existing object for this name. If one exists, replace its value. NSArray * extra = [[self extras] allObjects]; for (int idx = 0; idx < [extra count]; idx++) { if ([name isEqualToString:[[extra objectAtIndex:idx] valueForKey:@"name"]]) { [[extra objectAtIndex:idx] setValue:value forKey:@"value"]; return; } } // If an object for this name does not exist, create one. NSManagedObject * eventExtra = [NSEntityDescription insertNewObjectForEntityForName:@"EventExtra" inManagedObjectContext:[self managedObjectContext]]; [eventExtra setValue:name forKey:@"name"]; [eventExtra setValue:value forKey:@"value"]; [self addExtrasObject:eventExtra]; }

In Exercise 3-1, Part I, you learned how to use the StreamWriter and StreamReader to create and write to a text file. The program you wrote was a good beginning for learning the bare-minimum code you need to write to a file. However, as a test utility, it will need some work to make it truly useful. Adding logic to determine when to append to the file versus rewriting the whole file

Single x = 1.23F; Double x = 1.23D; Decimal x = 1.23M;

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Think for a moment about what you can do with the Event entity now. Right now, its attributes are creationDate, latitude, and longitude. But suppose that one event is a child s birthday party and another is for Oktoberfest. In the first case, you can use code like this: [kidsEvent setObject:@"Bruno" forKey:@"clownName"]; For the second case, you can use code like this: [oktoberEvent setObject:[NSNumber numberWithInt:2] forKey:@"dancingBearsCount"]; So, in the first case, the entity seems to have the attributes creationDate, latitude, longitude, and clownName, and, in the second case, the entity seems to have the attributes creationDate, latitude, longitude, and dancingBearsCount. Does this seem a little silly Of course! But the point is that you can dynamically choose some new attribute for your Event entity and just stick the data in there, and it will work. You do, though, have a detail to consider. You have to override the method that you use to get your list of available attributes for an entity. You can start with the list of attributes for your entity that is supplied to you by Core Data, but that no longer gives you the entire story. Now you have to look at the contents of the EventExtra entity. You have to return the distinct list of attributes that exist, so you have to get all the name entries from

2 rows in set (0.00 sec) mysql> select * from ztest; +----+------+ | id | name | +----+------+ | 11 | alex | | 22 | bob | | 33 | mary | +----+------+ 3 rows in set (0.00 sec)

You may notice that there is not a lot of difference in the values being assigned to these different data types. Since Singles, Doubles, and Decimals can all hold values with a decimal point, you can help the computer understand what data type you mean by adding a character to the end of the number: F is used for Single or Floating point values. A Single can also be called a Float. D in C# is used for Double values. This is the default in VB .NET, so no letter is needed. D is used in VB .NET and M is used in C# for Decimal values. There are also many specialized data types included with .NET; three of the more common ones are the Boolean, Date, and Object data types (see Table B-4).

all of those objects, create a nonduplicative list of names from this, and add that to what you have gotten from Core Data. You can add this method to your Event.m:

import java.io.*; import java.sql.*; import javax.sql.*; import javax.sql.rowset.WebRowSet; import com.sun.rowset.WebRowSetImpl; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class WebRowSetMetaDataExample { WebRowSet webRS; public static void main(String[] args) { String dbVendor = args[0]; // {"mysql", "oracle", "odbc"} WebRowSetMetaDataExample wrse = new WebRowSetMetaDataExample(); Connection conn = null; try { conn = VeryBasicConnectionManager.getConnection(dbVendor); wrse.populateRowSet(conn); wrse.writeXml(); } catch (Exception e) { e.printStackTrace(); } finally { DatabaseUtil.close(conn); } } void populateRowSet(Connection conn) throws Exception { System.out.println("Querying database for metadata only..."); String sqlQuery = "SELECT * FROM ztest WHERE 1=0"; System.out.println("sqlQuery="+sqlQuery);

Values are either true or false. Holds dates and times. Can be used to reference all other data types

- ( NSArray *)attributeNames { NSEntityDescription * extrasEntity = [[[[self entity] managedObjectModel] entitiesByName] objectForKey:@"EventExtras"]; NSFetchRequest * request = [[NSFetchRequest alloc] init]; [request setEntity:extrasEntity]; NSArray * fetchResults = [[self managedObjectContext] executeFetchRequest:request error:nil]; NSMutableSet * extraAttributes = [[NSMutableSet alloc] initWithSet:[NSSet setWithArray:[[[self entity] attributesByName] allKeys]]]; NSArray * foundNames = [fetchResults valueForKey:@"name"]; for (int idx = 0; idx < [foundNames count]; idx++) { if ([foundNames objectAtIndex:idx] != [NSNull null]) [extraAttributes addObject:[foundNames objectAtIndex:idx]]; } return [extraAttributes allObjects]; }

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