我有一个带有void返回类型的函数(包括整个函数):
CREATE OR REPLACE FUNCTION insert_avg_prices(p_county character varying, p_municipality character varying, p_district character varying, p_neighbourhood character varying, p_street character varying, p_number character varying, p_avg_rent decimal, p_avg_sale decimal)
RETURNS VOID AS
$BODY$
DECLARE
_precint_id integer;
_city_id integer;
_parish_id integer;
_county_id integer;
_address_id integer;
BEGIN
SELECT place_precint.precint_id INTO _precint_id FROM place_precint WHERE place_precint.name = p_neighbourhood;
SELECT place_city.city_id INTO _city_id FROM place_city WHERE place_city.name = p_district;
SELECT place_parish.parish_id INTO _parish_id FROM place_parish WHERE place_parish.name = p_municipality;
SELECT place_county.county_id INTO _county_id FROM place_county WHERE place_county.name = p_county;
SELECT full_addresses.f_address_id FROM full_addresses
WHERE full_addresses.county_id = _county_id AND
full_addresses.parish_id = _parish_id AND
full_addresses.city_id = _city_id AND
full_addresses.precint_id = _precint_id AND
full_addresses.street_name = p_street AND
full_addresses.number = p_number;
IF _address_id IS NULL THEN
INSERT INTO full_addresses(f_address_id,
county_id,
parish_id,
city_id,
precint_id,
street_name,
number)
VALUES (nextval('full_addresses_f_address_id_seq'),
_county_id,
_parish_id,
_city_id,
_precint_id,
p_street,
p_number);
SELECT currval('full_addresses_f_address_id_seq') INTO _address_id;
END IF;
INSERT INTO building_prices(building_id,
address_id,
avg_sau_sale_price,
avg_sau_rent_price)
VALUES (nextval('building_prices_building_id_seq'),
_address_id,
p_avg_sale,
p_avg_rent);
RETURN;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
如果我用这样的select语句调用它:
SELECT insert_avg_prices(...);
我收到错误:
ERROR: query has no destination for result data
HINT: If you want to discard the results of a SELECT, use PERFORM instead.
CONTEXT: PL/pgSQL function insert_avg_prices(character varying,character varying,character varying,character varying,character varying,character varying,numeric,numeric) line 16 at SQL statement
********** Error **********
ERROR: query has no destination for result data
SQL state: 42601
Hint: If you want to discard the results of a SELECT, use PERFORM instead.
我的CREATE FUNCTION语句没有错误。如何使它工作?
答案 0 :(得分:3)
在你的函数中你有一个SELECT
语句,但该语句无处可放。
INTO
子句将结果存储在本地变量中进行处理CURSOR
中的一个选项。显然错误在这里:
SELECT full_addresses.f_address_id FROM full_addresses WHERE ...
应该是
SELECT full_addresses.f_address_id INTO _address_id FROM full_addresses WHERE ...
请注意,PL / pgSQL是一种解释型语言,这意味着函数体不会像在Pascal或C ++等编译编程语言中那样评估语法完整性。因此,您可以编写一个函数,该函数仅在调用时显示任何错误。