[erlang-questions] Issues with ets:match_delete

[Sverker Eriksson]

Your ets:match_delete looks fine.
Are you sure the table is still alive? Try ets:info(table_name).

When you get an exception in the Erlang shell, the shell process will terminate and be restarted
losing all process specific resources such as ets tables.


/Sverker, Erlang/OTP


On tor, 2018-07-12 at 16:35 -0400, Code Wiget wrote:
Hey everyone,

Lets say you have an ets table with entries as shown below:

{table_name, key, {A, [B]}.

I am trying to delete all table entries matching A. I can create a match like so:

ets:match(table_name, {'_', '_', {Node, '$1'}})

and it returns the values for B. But when I run match_delete or select_delete, I get a badarg error…:

ets:match_delete(table_name, {'_', '_', {Node, '$1'}}).
** exception error: bad argument
     in function  ets:select_delete/2
        called as ets:select_delete(table_name,
                                    [{{'_','_',{{{192,168,1,104},9042},'$1'}},[],[true]}])
     in call from ets:match_delete/2 (ets.erl, line 726)
(NODE)16> ets:select_delete(table_name, {'_', '_', {Node, '$1'}}).
** exception error: bad argument
     in function  ets:select_delete/2
        called as ets:select_delete(table_name,{'_','_',{{{192,168,1,104},9042},'$1'}})

So I tried to match and object and delete it...

(NODE)17> ets:match_object(table_name, {'_', '_', {Node, '$1'}}).
[{table_name,'$primary_cluster',
                Info…]


(NODE)25> ets:delete_object(table_name, Info).
** exception error: bad argument
     in function  ets:delete_object/2
        called as ets:delete_object(table_name, …. )

I would like to avoid re-creating the table structure, as it is not from a project that I created and would take some time to fix all the code. How do I delete something from this table?

Thanks!



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