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annotate PostgreSQL/Plugins/GetLastChangeIndex.sql @ 328:6a49c495c940

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 22 Jul 2021 20:20:26 +0200
parents 1012fe77241c
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1012fe77241c new extension implemented for PostgreSQL and SQLite: GetLastChangeIndex
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1 -- In PostgreSQL, the most straightforward query would be to run:
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3 -- SELECT currval(pg_get_serial_sequence('Changes', 'seq'))".
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5 -- Unfortunately, this raises the error message "currval of sequence
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6 -- "changes_seq_seq" is not yet defined in this session" if no change
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7 -- has been inserted before the SELECT. We thus track the sequence
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8 -- index with a trigger.
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9 -- http://www.neilconway.org/docs/sequences/
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11 INSERT INTO GlobalIntegers
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12 SELECT 6, CAST(COALESCE(MAX(seq), 0) AS BIGINT) FROM Changes;
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15 CREATE FUNCTION InsertedChangeFunc()
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16 RETURNS TRIGGER AS $body$
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17 BEGIN
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18 UPDATE GlobalIntegers SET value = new.seq WHERE key = 6;
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19 RETURN NULL;
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20 END;
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21 $body$ LANGUAGE plpgsql;
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24 CREATE TRIGGER InsertedChange
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25 AFTER INSERT ON Changes
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26 FOR EACH ROW
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27 EXECUTE PROCEDURE InsertedChangeFunc();