Re: Alias field names in foreign data wrapper?

On Fri, Mar 27, 2015 at 1:55 PM, Deven Phillips <deven(dot)phillips(at)gmail(dot)com>
wrote:

> Better example of the problem... My FDW table schema is:
>
> CREATE FOREIGN TABLE liquorstore_backendipaddress (
> id bigint NOT NULL,
> backend_network_id bigint,
> backend_virtual_interface_id bigint,
> address character varying(15) NOT NULL,
> is_gateway boolean NOT NULL,
> is_reserved boolean NOT NULL
> )
> SERVER edison
> OPTIONS (
> dbname 'edison',
> table_name 'liquorstore_backendvirtualinterface'
> );
>
>
> But when I run the following query:
>
> SELECT
> *
> FROM liquorstore_backendipaddress
>
> I get an error:
>
> ccedison=# SELECT * FROM liquorstore_backendipaddress;
> ERROR: failed to prepare the MySQL query:
> Unknown column 'backend_network_id' in 'field list'
>
> I still cannot figure out what the problem might be so any help would be
> GREATLY appreciated.
>
> Thanks,
>
> Deven
>
> On Fri, Mar 27, 2015 at 4:15 PM, Deven Phillips <deven(dot)phillips(at)gmail(dot)com>
> wrote:
>
>> I am trying out some ideas using FDW, and I have added some FDW tables
>> which access a backend MySQL DB... Unfortunately, I am getting some errors
>> because of fields names with reserved words. I was wondering if there is a
>> way to "alias" a field name when creating the foreign table?
>>
>> Thanks in advance!!!
>>
>> Deven
>>
>
>
​I'm not seeing where you've provided sufficient information for someone to
help you.​

From what I can tell there is not aliasing capability native to the FDW
implementation so anything would have to be defined in OPTIONS for the
table which is a wrapper-controlled structure.

Depending on the overall needs you typically can use reserved label as
identifiers if you surround them with double-quotes.

CREATE ... (
"troublesome column name here" bigint,
...
)

​David J.​