使用PLPGSQL的`RETURN SETOF`與加盟

Question

我越來越麻煩PostgreSQL中返回值返回一個簡單的查詢，我創造了這樣的功能（編者）：

CREATE OR REPLACE FUNCTION GetComissionamento(pv varchar(50)) 
RETURNS SETOF tb_comissionamentos AS 
$$ 
BEGIN 
SELECT com.* FROM tb_vendas as vendas 
INNER JOIN tb_pagamentos as pg on vendas.id_venda = pg.id_venda 
INNER JOIN tb_comissionamentos as com on vendas.id_venda = com.id_venda 
    AND com.id_pagamento = pg.id_pagamento 
WHERE id_venda_imobiliaria = pv; 
END 
$$ 
LANGUAGE plpgsql; 

，我想返回查詢所說的表tb_comissionamento上的數據。 我該怎麼辦？當我打電話的功能，我得到了錯誤信息：

ERROR: query has no destination for result data 
HINT: If you want to discard the results of a SELECT, use PERFORM instead. 

Answer 1

這是不好的。

1. 這應該是一個VIEW而不是函數

這樣，

CREATE VIEW GetComissionamento AS 
SELECT com.* FROM tb_vendas as vendas 
    INNER JOIN tb_pagamentos as pg on vendas.id_venda = pg.id_venda 
    INNER JOIN tb_comissionamentos as com on vendas.id_venda = com.id_venda 
     AND com.id_pagamento = pg.id_pagamento; 

然後（其中$ PV是你的價值），

SELECT * 
FROM GetComissionamento 
WHERE id_venda_imobiliaria = $pv; 

1. 如果你打算把這個簡單的東西變成一個函數使用plpgsql

像這樣sql代替，

CREATE FUNCTION GetComissionamento(varchar(50)) 
RETURNS tb_comissionamentos AS $$ 
SELECT com.* FROM tb_vendas as vendas 
INNER JOIN tb_pagamentos as pg on vendas.id_venda = pg.id_venda 
INNER JOIN tb_comissionamentos as com on vendas.id_venda = com.id_venda 
    AND com.id_pagamento = pg.id_pagamento 
WHERE id_venda_imobiliaria = $1; 
$$ LANGUAGE SQL; 

如果你要保持它作爲一個PLPGSQL使用RETURN QUERY。

這樣，

CREATE OR REPLACE FUNCTION GetComissionamento (pv varchar(50)) 
RETURNS tb_comissionamentos AS $$ 
BEGIN 
    RETURN QUERY 
    SELECT com.* FROM tb_vendas as vendas 
    INNER JOIN tb_pagamentos as pg on vendas.id_venda = pg.id_venda 
    INNER JOIN tb_comissionamentos as com on vendas.id_venda = com.id_venda 
     AND com.id_pagamento = pg.id_pagamento 
    WHERE id_venda_imobiliaria = pv; 
    -- error checking or whatever 
    RETURN; 
END; 
$$ LANGUAGE plpgsql; 

Answer 2

燁，得到了錯誤，忘記返回查詢

CREATE OR REPLACE FUNCTION GetComissionamento(pv varchar(50)) 
RETURNS SETOF tb_comissionamentos AS 
$$ 
BEGIN 
RETURN QUERY SELECT com.* FROM tb_vendas as vendas 
INNER JOIN tb_pagamentos as pg on vendas.id_venda = pg.id_venda 
INNER JOIN tb_comissionamentos as com on vendas.id_venda = com.id_venda 
    AND com.id_pagamento = pg.id_pagamento 
WHERE id_venda_imobiliaria = pv; 
END 
$$ 
LANGUAGE plpgsql;