I should have started this email with ... C# ... Firebird ADO.NET ...
FirebirdClient.5.8.0 ... Visual Studio 2013.
I tried entering
CREATE GENERATOR gen_t1_id;
SET GENERATOR gen_t1_id TO 0;
set term !! ;
CREATE TRIGGER T1_BI FOR T1
in my C# code ... the compiler complains. This appears to not be
relevant for C#.
What I need is the ability to add data and retrieve the primary key
which needs to be autoincremented ... see
http://stackoverflow.com/questions/42981872/why-the-executenonquery-catch-exception-validation-error-for-column-orgtable
for the current code.
On Fri, Mar 24, 2017 at 10:57 AM, Scott Morgan <bl...@blueyonder.co.uk> wrote:
> On 03/24/2017 03:09 PM, Clyde Eisenbeis wrote:
>> Using http://www.firebirdfaq.org/faq29/ as a reference.
>>
>> 1) If I understand this website, the CREATE GENERATOR is initiated only once?
>
> Yes. It's a global item like a table, so you just need to create it once
> (and commit that change to the DB,. Changes to tables and other global
> items like that all need to be committed before using them). It'll have
> an initial value of 0 and calls to GEN_ID will increment it by the
> specified value (usually 1)
>
>> 2) Likewise the CREATE TRIGGER is initiated only once?
>
> Yes. It's just associated with the table, ready to run whenever the
> specific event happens, so...
>
>> 3) When is the T1_BI used (CREATE TRIGGER T1_BI FOR T1)?
>
> The "ACTIVE BEFORE INSERT POSITION 0" specifies that. In this case
> 'BEFORE INSERT', so whenever a new item is inserted into the table, that
> trigger is run.
>
>> 4) I see the 'id' field in table t1. I see upper case 'ID' in the
>> TRIGGER. Are these two the same?
>
> Yes. (Bit of bad form in that FAQ there I'd say, mixing case) Unquoted
> identifiers (names of tables, columns, etc.) are stored in upper case.
> So id, ID, iD, and Id are all the same (ID).
>
>
> You'll get more detailed answers about this stuff on the main Firebird
> mailing list, and I highly recommend the Firebird Book by Helen Borrie,
> which covers all this clearly and in depth. It's things like triggers
> and foreign keys that make a proper DB so powerful, but it can take a
> bit of getting used to.
>
> Scott
>
>
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