> While this solves the problem for an array of 'primitive' types. What if I
> want an array or collection of an arbitrary type like list<foo>, where foo is
> a user defined type?
Do you mean a custom Cassandra data type that sub classes AbstractType? I dont
think CQL can support those, I may be wrong though.
If you mean a basic client side data type you could serialise it and store as a
string or byte buffer in a CQL collection.
> What are the options to solve this type of array?
...
> arbitrary type like list<foo>,
Do you mean an array such as int[] or do you mean the equivalent of a java
List<T> with functions like remove that actually delete items and from the list?
If it's the former a CQL table such as below would work
CREATE TABLE vectors (
vector_name text,
index bigint,
object_property_1 text,
object_property_2 text,
PRIMARY_KEY (vector_name, index)
);
The problem is, if you delete a element at (vector, index) the remaining
indexes will be off.
If it's the later, a List<T>, then it depends a little on what features you
want to support. If you want a sorted list of objects the table is roughly the
same
CREATE TABLE List (
list_name text,
sort_key bigint,
object_property_1 text,
object_property_2 text,
PRIMARY_KEY (list_name, sort_key)
);
Hope that helps.
-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com
On 13/11/2012, at 9:46 AM, Kevin Burton <rkevinbur...@charter.net> wrote:
> While this solves the problem for an array of 'primitive' types. What if I
> want an array or collection of an arbitrary type like list<foo>, where foo is
> a user defined type? I am guessing that this cannot be done with
> 'collections'. What are the options to solve this type of array?
>
> On Nov 12, 2012, at 2:28 PM, aaron morton <aa...@thelastpickle.com> wrote:
>
>> This may help http://www.datastax.com/dev/blog/cql3_collections
>>
>>> I have gotten as far as feeling a need to understand a ‘super-column’
>> You can happily ignore them.
>>
>>
>> Cheers
>>
>> -----------------
>> Aaron Morton
>> Freelance Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 12/11/2012, at 8:35 PM, Kevin Burton <rkevinbur...@charter.net> wrote:
>>
>>> I am sorry if this is an FAQ. But I was wondering what the syntax for
>>> describing an array? I have gotten as far as feeling a need to understand a
>>> ‘super-column’ but I fail after that. Once I have the metadata in place to
>>> describe an array how do I insert data into the array? Get data from the
>>> array? Thank you.
>>>
>>
