59 lines
1.6 KiB
PL/PgSQL
59 lines
1.6 KiB
PL/PgSQL
-- Deploy camper:parse_price to pg
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-- requires: roles
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-- requires: schema_camper
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begin;
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set search_path to camper, public;
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create or replace function parse_price(price text, decimal_digits integer default 2) returns integer as
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$$
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declare
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parts text[];
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result int;
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frac_part text;
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sign int := 1;
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begin
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if price like '-%' Then
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sign := -1;
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price := substring(price from 2);
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end if;
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parts := string_to_array(price, '.');
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if array_length(parts, 1) > 2 then
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raise invalid_parameter_value using message = price || ' is not a valid price representation.';
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end if;
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result := parts[1]::integer;
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if result is null then
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raise invalid_parameter_value using message = price || ' is not a valid price representation.';
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end if;
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for d in 1..decimal_digits loop
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result := result * 10;
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end loop;
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if array_length(parts, 1) = 2 then
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frac_part := rtrim(parts[2], '0');
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if length(frac_part) > decimal_digits then
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raise invalid_parameter_value using message = price || ' has too many digits in the fraction part.';
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end if;
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frac_part := rpad(frac_part, decimal_digits, '0');
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result := result + frac_part::integer;
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end if;
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return sign * result;
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end;
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$$
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language plpgsql
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immutable;
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comment on function parse_price(text, integer) is
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'Converts the string representation of a price in decimal form to cents, according to the number of decimal digits passed.';
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revoke execute on function parse_price(text, integer) from public;
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grant execute on function parse_price(text, integer) to guest;
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grant execute on function parse_price(text, integer) to employee;
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grant execute on function parse_price(text, integer) to admin;
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commit;
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