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I'm new to firebird and I have verious issues. I want to insert various lines into a table selected from another table.
Here's the code:
The ID should autoincrement from 66 on. The posid should autoincrement from 1 on.
Actually it is not inserting anything.
I'm using Firebird Maestro and have just opened the SQL Script Editor (which doesnt throw any error message on executing the script).
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Can anybody help me?
Thanks!
Additional information:
The trigger should autoincrement the column 'ID' - but I dont know how exactly I can change it so it works. The ':posid' throws an error using it :posid but like this theres no error (I guess its interpretated as a string). But how do I use it right?
I dont get errors when I execute it. The table structure is easy. I have 2 tables:1.
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and the 2. other table
-> I want to insert all entries from the table BAS_ART which contain 'MyWord' in the column ARTCATEGORY into the MATERIAL table.
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2 Answers
I don't understand why you need the trigger at all.
This problem:
I want to insert all entries from the table BAS_ART which contain 'MyWord' into the MATERIAL table
Can be solved with a single
insert .. select
statement. This assumes that there is a second sequence (aka 'generator') that is named
a_horse_with_no_namea_horse_with_no_nameseq_mat_id
that provides the new id for the column material.id
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For most of my answer I will assume a very simple table:
Auto-increment identifier
Firebird (up to version 2.5) does not have an identity column type (this will be added in Firebird 3), instead you need to use a sequence (aka generator) and a trigger to get this.
Sequence
First you need to create a sequence using
CREATE SEQUENCE
:A sequence is atomic which means interleaving transactions/connections will not get duplicate values, it is also outside transaction control, which means that a
ROLLBACK
will not revert to the previous value. In most uses a sequences should always increase, so the value reset you do at the start of your question is wrong for almost all purposes; for example another connection could reset the sequence as well midway in your execution leaving you with unintended duplicates of POSID
.Trigger
To generate a value for an auto-increment identifier, you need to use a
BEFORE INSERT TRIGGER
that assigns a generated value to the - in this example - ID
How to update my gps. column.In this example I always assign a generated value, other examples assign a generated value only when the
ID
is NULL
.Getting the value
To get the generated value you can use the
RETURNING
-clause of the INSERT
-statement:INSERT INTO .. SELECT
Using
INSERT INTO .. SELECT
you can select rows from one table and insert them into others. The reason it doesn't work for you is because you are trying to assign the string value ':pos'
to a column of type INTEGER
, and that is not allowed.Assuming I have another table
MyOtherTable
with a similar structure as MyTable
I can transfer values using:Using
INSERT INTO .. SELECT
it is not possible to obtain the generated values unless only a single row was inserted.Guesswork with regard to POSID
It is not clear to me what
POSID
is supposed to be, and what values it should have. It looks like you want to have an increasing value starting at 1 for a single INSERT INTO .. SELECT
. In versions of Firebird up to 2.5 that is not possible in this way (in Firebird 3 you would be able to use ROW_NUMBER()
for this).If my guess is right, then you will need to use an
EXECUTE BLOCK
(or a stored procedure) to assign and increase the value for every row to be inserted.The execute block would be something like:
Without an
Mark RotteveelMark RotteveelORDER BY
with the SELECT
the value of posid is essentially meaningless, because there is no guaranteed order.65.2k1414 gold badges8686 silver badges126126 bronze badges