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ex_money

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Money functions for operations on and localization of a money data type with support for ISO 4217 currencies and ISO 24165 digial tokens (crypto currencies).

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Activity
ex_money priv SQL postgres define_aggregate_functions.sql
Raw

priv/SQL/postgres/define_aggregate_functions.sql 

CREATE OR REPLACE FUNCTION money_state_function(agg_state money_with_currency, money money_with_currency)

RETURNS money_with_currency

IMMUTABLE

STRICT

LANGUAGE plpgsql

AS $$

  DECLARE

    expected_currency char(3);

    aggregate numeric(20, 8);

    addition numeric(20,8);

  BEGIN

    if currency_code(agg_state) IS NULL then

      expected_currency := currency_code(money);

      aggregate := 0;

    else

      expected_currency := currency_code(agg_state);

      aggregate := amount(agg_state);

    end if;



    IF currency_code(money) = expected_currency THEN

      addition := aggregate + amount(money);

      return row(expected_currency, addition);

    ELSE

      RAISE EXCEPTION

        'Incompatible currency codes. Expected all currency codes to be %', expected_currency

        USING HINT = 'Please ensure all columns have the same currency code',

        ERRCODE = '22033';

    END IF;

  END;

$$;





CREATE AGGREGATE sum(money_with_currency)

(

  sfunc = money_state_function,

  stype = money_with_currency

);