RETURN在函數返回集中不能有參數;使用RETURN NEXT或接近「QUERY」的Postgres

Question

當我嘗試編譯此功能：我爲什麼會得到這個錯誤

CREATE OR REPLACE FUNCTION test_proc4(sr_num bigint) 
    RETURNS TABLE(sr_number bigint, product_serial_number varchar(35)) 
AS $$ 
    BEGIN 
     RETURN QUERY SELECT select sr_number,product_serial_number from temp_table where sr_number=sr_num 
    END; 
$$ 
LANGUAGE 'plpgsql' VOLATILE; 

？

RETURN在函數返回集中不能有參數;請在「QUERY」處或附近使用RETURN NEXT

我正在使用postgres版本8.4。

從一個錯字（你複製 select，而你沒有終止 RETURN語句用分號），我認爲你是相當接近

Answer 1

除了 - 只需要通過與臺限定它們的歧義查詢中的表列名稱。試試這個（希望重新格式化，以提高可讀性）：

CREATE OR REPLACE FUNCTION test_proc4(sr_num bigint) 
    RETURNS TABLE(sr_number bigint, product_serial_number varchar(35)) AS $$ 
    BEGIN 
    RETURN QUERY 
     SELECT 
     temp_table.sr_number, temp_table.product_serial_number 
     from temp_table 
     where temp_table.sr_number=sr_num; 
    END; 
$$ LANGUAGE 'plpgsql' VOLATILE; 

警告：我只在PG 9.4測試這一點，所以在您的版本沒有測試它，但（這是不再支持，我可以補充）。用我用虛擬數據填充表

CREATE OR REPLACE FUNCTION test_proc4(sr_num bigint) 
    RETURNS TABLE(sr_number bigint, product_serial_number varchar(35)) AS $$ 
    BEGIN 
    FOR sr_number, product_serial_number IN 
     SELECT 
     temp_table.sr_number, temp_table.product_serial_number 
     from temp_table 
     where temp_table.sr_number=sr_num 
    LOOP 
     RETURN NEXT; 
    END LOOP; 
    RETURN; 
    END; 
$$ LANGUAGE 'plpgsql' VOLATILE; 

一個小的完整性檢查：

postgres=# select * from temp_table; 
sr_number | product_serial_number 
-----------+----------------------- 
     1 | product 1 
     2 | product 2 
     2 | another product 2 
(3 rows) 

postgres=# select * from test_proc4(1); 
sr_number | product_serial_number 
-----------+----------------------- 
     1 | product 1 
(1 row) 

postgres=# select * from test_proc4(2); 
sr_number | product_serial_number 
-----------+----------------------- 
     2 | product 2 
     2 | another product 2 
(2 rows)