Samuele Locatelli
42 lines
1013 B
SQL
42 lines
1013 B
SQL
CREATE PROCEDURE stp_counterGetNextBlock(
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IN pYear INT,
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IN pName VARCHAR(100),
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IN pCount INT,
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OUT pStart INT
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)
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LANGUAGE SQL
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NOT DETERMINISTIC
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CONTAINS SQL
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SQL SECURITY DEFINER
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COMMENT 'Ritorna il prossimo valore di contatore per il flusso richiesto'
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BEGIN
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DECLARE vOld INT;
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DECLARE vNew INT;
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-- Leggo il valore precedente (se esiste)
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SELECT Counter INTO vOld
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FROM utils_counter
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WHERE RefYear = pYear AND CountName = pName
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FOR UPDATE;
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IF vOld IS NULL THEN
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-- Primo inserimento
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SET vOld = 0;
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SET vNew = pCount;
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INSERT INTO utils_counter (RefYear, CountName, Counter)
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VALUES (pYear, pName, vNew)
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ON DUPLICATE KEY UPDATE Counter = VALUES(Counter);
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ELSE
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-- Incremento esistente
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SET vNew = vOld + pCount;
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UPDATE utils_counter
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SET Counter = vNew
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WHERE RefYear = pYear AND CountName = pName;
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END IF;
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-- pStart = primo valore del blocco
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SET pStart = vOld + 1;
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END; |