Sql void函数抛出“查询没有结果数据的目标”错误
我有一个包含整个函数的void return type函数:Sql void函数抛出“查询没有结果数据的目标”错误,sql,postgresql,Sql,Postgresql,我有一个包含整个函数的void return type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
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;
如果我用如下select语句调用它:
SELECT insert_avg_prices(...);
我得到一个错误:
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.
CREATEFUNCTION语句没有错误。如何使其工作?在函数中有一个SELECT语句,但该语句没有地方放置其数据 如果是,则使用INTO子句将结果存储在局部变量中以进行处理 如果语句返回多行,请使用或的选项之一。 显然,错误在这里:
SELECT full_addresses.f_address_id FROM full_addresses WHERE ...
应该是哪一个
SELECT full_addresses.f_address_id INTO _address_id FROM full_addresses WHERE ...
注意PL/PGSQL是一种解释性语言,这意味着函数体不会像编译Pascal或C++的编译程序语言那样被评估。因此,您可以编写一个只在调用时才显示任何错误的函数。
这没有意义-即使在函数调用级别,为什么您会有一个函数在select中返回void?在任何情况下,许多错误只有在实际执行相关函数时才会出现——很明显,函数中的某个地方有一个select,它不会将结果存储在变量/参数中。此外,我还避免在函数中使用副作用作为一般规则。这太痛苦了。如果你要迁移到Postgres,你真的很想知道Postgres与你来自的地方有什么不同。这个错误是由函数中的一个命令引起的。显示整个函数体。请编辑问题下方的灰色链接以显示函数体。包括整个函数