postgresql無法打開INSERT查詢作爲光標

Question

我試圖生成動態查詢插入動態選擇結果到表中。我的代碼如下。

CREATE OR REPLACE FUNCTION public.report_get_result(
datekey integer) 
RETURNS setof public.logic_result_rcd 
LANGUAGE 'plpgsql' 
COST 100 
VOLATILE 
AS $BODY$ 

DECLARE 
    LogicID text; 
    SheetName text; 
    Row_ID text; 
    Column_ID text; 
    FromTable text; 
    Operation text; 
    Amount text; 
    CriteriaType_1 text; 
    Function_1 text; 
    Criteria_1 text; 
    CriteriaType_2 text; 
    Function_2 text; 
    Criteria_2 text; 
    CriteriaType_3 text; 
    Function_3 text; 
    Criteria_3 text; 
    sql text; 
    INC Integer; 

begin 
DROP TABLE IF EXISTS loans; 
create temp table loans as 
select * from loan.vfact_state_principal where "DateKey" = datekey; 
DECLARE cursor_logic REFCURSOR; 
BEGIN 
OPEN cursor_logic for SELECT "LogicID" FROM logic_table_rcd; 
LOOP 
    FETCH cursor_logic INTO INC; 
    if not found then exit; 
    end if; 
    BEGIN 

    select into LogicID "LogicID" from public.logic_table_rcd WHERE 
"LogicID" = 1; 
    select into SheetName "SheetName" from public.logic_table_rcd WHERE 
"LogicID" = 1; 
    select into Row_ID "Row_ID" from public.logic_table_rcd WHERE "LogicID" 
= 1; 
    select into Column_ID "Column_ID" from public.logic_table_rcd WHERE 
"LogicID" = 1; 
    select into FromTable "FromTable" from public.logic_table_rcd WHERE 
"LogicID" = 1; 
    select into Operation "Operation" from public.logic_table_rcd WHERE 
"LogicID" = 1; 
    select into Amount "Amount" from public.logic_table_rcd WHERE "LogicID" 
= 1; 
    select into CriteriaType_1 CASE WHEN "CriteriaType_1" <> '' OR 
"CriteriaType_1" is not null THEN (' WHERE "' || "CriteriaType_1" || '"') 
ELSE '' END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into Function_1 CASE WHEN "Function_1" is null THEN '' ELSE 
"Function_1" END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into Criteria_1 CASE WHEN "Criteria_1" is null THEN '' ELSE 
"Criteria_1" END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into CriteriaType_2 CASE WHEN "CriteriaType_2" <> '' OR 
"CriteriaType_2" is not null THEN ' AND "' || "CriteriaType_2" || '"' ELSE 
'' END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into Function_2 CASE WHEN "Function_2" is null THEN '' ELSE 
"Function_2" END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into Criteria_2 CASE WHEN "Criteria_2" is null THEN '' ELSE 
"Criteria_2" END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into CriteriaType_3 CASE WHEN "CriteriaType_3" <> '' or 
"CriteriaType_3" is not null THEN ' AND "' || "CriteriaType_3" || '"' ELSE 
'' END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into Function_3 CASE WHEN "Function_3" is null THEN '' ELSE 
"Function_3" END from public.logic_table_rcd WHERE "LogicID" = 1; 
    select into Criteria_3 CASE WHEN "Criteria_3" is null THEN '' ELSE 
"Criteria_3" END from public.logic_table_rcd WHERE "LogicID" = 1; 

sql:= 'INSERT INTO public.logic_result_rc SELECT ' || INC::text || ', 1, ' 
|| DateKey::text || ', ''' || 'RCD' || ''', ''' || SheetName::text || ''', ' 
|| Row_ID::text || ', ' 
|| Column_ID::text || ', ' || Operation || '("' || Amount || '")' || ' FROM 
' || FromTable 
    || CriteriaType_1 || ' ' || Function_1 || ' ' || Criteria_1 
    || CriteriaType_2 || ' ' || Function_2 || ' ' || Criteria_2 
    || CriteriaType_3 || ' ' || Function_3 || ' ' || Criteria_3; 

RETURN QUERY EXECUTE sql; 
END; 
END LOOP; 
CLOSE cursor_logic; 
END; 
END; 
$BODY$; 
ALTER FUNCTION public.report_get_result(integer) 
OWNER TO postgres; 

但執行後，我得到了一個錯誤：

cannot open INSERT query as cursor 

所有的變量都正確分配。可能是插入必須在光標外的其他地方？ INSERT INTO .... FETCH ALL聲明是否存在？

Answer 1

INSERT在默認情況下不返回任何行，所以沒有任何提取。您可以通過追加sql字符串與RETURNING *來解決這個問題，應該返回插入到public.logic_result_rc中的內容。

因此，這將是這樣的：RETURN QUERY EXECUTE concat(sql, ' RETURNING *');

基本語法是：

INSERT INTO table_name (column_name [, ...]) 
    VALUES () | query 
    RETURNING * --or list of columns, same syntax like for SELECT