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Re: Possible to prevent transaction abort?

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I'm intrigued by this solution, Johan.  It might be just the ticket!  I'll do some benchmarks when I have time in a week or so.

Johan Nel wrote:
Adam B wrote:
Hello all,

Is it possible to prevent Postgre from aborting the transaction upon a constraint violation?
>From the help files maybe the following could get you on the right track:

This example uses exception handling to perform either UPDATE or INSERT, as appropriate:
CREATE TABLE db (a INT PRIMARY KEY, b TEXT);
CREATE FUNCTION merge_db(key INT, data TEXT) RETURNS VOID AS
$$
BEGIN
    LOOP
        -- first try to update the key
        UPDATE db SET b = data WHERE a = key;
        IF found THEN
            RETURN;
        END IF;
        -- not there, so try to insert the key
        -- if someone else inserts the same key concurrently,
        -- we could get a unique-key failure
        BEGIN
            INSERT INTO db(a,b) VALUES (key, data);
            RETURN;
        EXCEPTION WHEN unique_violation THEN
            -- do nothing, and loop to try the UPDATE again
        END;
    END LOOP;
END;
$$
LANGUAGE plpgsql;

HTH,

Johan Nel
Pretoria, South Africa.





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