Key- Value Table help required

sagarshivam · Aug 29, 2011

Hi all!!

I am looking for some data structure which will store data in terms of key and value and where one key corresponds to one or more than one value.

So , something like:

KEY VALUE
key1 value1
key1 value2
key1 value3
key2 value4
key2 value5
...... ..........

and on query all VALUE for a particular KEY is obtained in array.

I tried implementing NSDictionary but I am able to save on one to one basis only Multiple values for one ley is not possible.

Kindly help

sagarshivam · Aug 29, 2011

or say that I have three keys (string type)like: key1,key2 and key3 and corresponding to each I have three arrays (NSarray type) array1, array2 and array3

So i want to map these as key and values:

key1 ---------> array1
key2----------> array2
key3----------> array3

So that from this structure, whenever VALUE for KEY (say key1) is queried, array1 (and so on) is returned.

Thanks in advance

Nethfel · Aug 29, 2011

If you're doing a single key refers to a single array, you can use an NSDictionary. NSDictionaries can contain NSArrays (or NSMutableArrays) - the problem arises if you want to use a single key to refer to multiple different arrays (which would make sense because then how would you know what array you really wanted?) which technically you still could do - You could have a key reference a mutable array in an ns dictionary, each entry in the mutable array is another array.

So it might look like:

Code:

Dict key1 ------------> Mutable Array of possibles
                                 |----> Mutable array 1
                                 |----> Mutable array 2
                                 |----> Mutable array 3
Dict key2 ------------> Mutable Array of possibles
                                 |----> Mutable array 1
                                 |----> Mutable array 2
                                 |----> Mutable array 3
Dict key3 ------------> Mutable Array of possibles
                                 |----> Mutable array 1
                                 |----> Mutable array 2
                                 |----> Mutable array 3

Of course, the other option is to use an SQLite database or CoreData

sagarshivam · Aug 31, 2011

Thanks a lot. you always have helped me in trying further with codes.

Key- Value Table help required

sagarshivam

sagarshivam

Nethfel

sagarshivam

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