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Interbase sequences

Posted on 2001-08-07
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Last Modified: 2008-02-26
Does anyone know if interbase supports the concept of sequences? If not what is the best way to generate an integer primary key?

Thanks

J
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Question by:nnbbb09
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kretzschmar earned 75 total points
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the sequences known by oracle are called generators in interbase

to create a generator

create generator Aname;

to access the generator

gen_id(AName)

meikl ;-)
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by:kretzschmar
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a sample for an insert

insert into atable (id, afield) values (gen_id(aname), 'Something')
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see also
http://community.borland.com/article/0,1410,25167,00.html

i have missed somethig
to access use

gen_id(aname,1)

meikl ;-)
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or

Auto-Increment fields in InterBase - by Borland Developer Support Staff




Abstract:How to create an Auto-Increment field in InterBase
Question:
    I have an InterBase table, but I can?t figure out how to make an Auto-Increment field for it. How do I do this?
Answer:
    InterBase doesn?t have a convenient AutoInc datatype like Paradox, so we have to do a little bit of work to get this functionality. Start out by creating an Integer field that is appropriate for the size of the values you want in your AutoInc field. From there, we need a trigger to calculate the value for the field:


     CREATE TRIGGER autoinc FOR tablename
     BEFORE INSERT AS
     BEGIN
        NEW.autoinc_field_nane = GEN_ID(generator_name, 1);
     END

    We aren?t done yet. We need a persistent location to store the current AutoInc value. InterBase?s way to deal with this is called a generator:

     CREATE GENERATOR generator_name;
     SET GENERATOR generator_name TO x;

    GEN_ID() is a built-in InterBase function specially designed to increment the generator specified by the first parameter by the value in the second parameter. The SET GENERATOR statement initializes the generator to the value provided by x. This is useful if your database is based on something like a customer number, and you want this customer number to start at a specific value rather than zero.     And that is all there is to it. From here on, you can insert away and this trigger will stick the correct value into autoinc_field_name. For further information on how to work with Auto-Increment fields in your application, read the TI "Working With Auto-increment Field Types" at http://community.borland.com/article/0,1410,16123,00.html.
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by:nnbbb09
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Thanks Meikl. I'm new to Interbase so I may have a few more questions in the future!

Jo
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by:kretzschmar
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no problem i use a lot different databases,
except they from microsoft,
primary oracle, but also interbase

just ask, if you have a problem

well, glad to helped you in this case :-)
good luck again

meikl ;-)


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