[jira] [Commented] (IGNITE-4904) .NET: DML via LINQ

["Pavel Tupitsyn (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-4904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019722#comment-16019722 ] 

Pavel Tupitsyn commented on IGNITE-4904:
----------------------------------------

{{CompiledQuery}} won't support this directly, since {{DeleteAll}} returns {{int}}, but we can invent something like {{CompileDelete}} as a separate task.

> .NET: DML via LINQ
> ------------------
>
>                 Key: IGNITE-4904
>                 URL: https://issues.apache.org/jira/browse/IGNITE-4904
>             Project: Ignite
>          Issue Type: New Feature
>          Components: platforms
>    Affects Versions: 1.9
>            Reporter: Pavel Tupitsyn
>            Assignee: Pavel Tupitsyn
>              Labels: .NET, LINQ
>             Fix For: 2.1
>
>
> Perform bulk update operations via LINQ: {{UPDATE WHERE}}, {{DELETE WHERE}}. Insert can already be done on object level with {{ICache.PutAll}}.
> 1) {{DELETE WHERE}}. This is quite simple. We can provide an extension method like this:
> {code}
> public static int DeleteAll<K, V>(this ICache<K, V> cache, IQueryable<ICacheEntry<K, V>> items);
> {code}
> 2) {{UPDATE WHERE}}. This is tricky, because LINQ only works with expression trees, and multi-line methods are not supported. We should come up with a way to provide a list of columns and values, something like
> {code}
> public static int UpdateAll<K, V>(this ICache<K, V> cache, IQueryable<ICacheEntry<K, V>> items, params UpdateAction[] actions);
> {code}
> where UpdateAction can consist of a MemberExpression and a value for that member.
> We should probably do delete as a separate task first.



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