Question

我想使用函数在表中添加多行但无法通过F1（thebook book[]）。如有任何解决方案，请提供帮助。

CREATE TABLE book
(
  id smallint NOT NULL DEFAULT 0,       
  bname text,       
  btype text,
  bprices numeric(11,2)[],
  CONSTRAINT key PRIMARY KEY (id )
);

CREATE OR REPLACE FUNCTION save_book(thebook book)
  RETURNS text AS
  $BODY$
DECLARE 
  myoutput text :='Nothing has occured';
BEGIN

  update book set 
  bname=thebook.bname,
  btype=thebook.btype,bprices=thebook.bprices  WHERE id=thebook.id;

  IF FOUND THEN
    myoutput:= 'Record with PK[' || thebook.id || '] successfully updated';
    RETURN myoutput;
  END IF;

  BEGIN
    INSERT INTO book values(thebook.id,thebook.bname,thebook.btype, thebook.bprices);
    myoutput:= 'Record successfully added';           
  END;
  RETURN myoutput;

END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;

SELECT save_book(row(111,'the art of living','ABC', array[190,220])::book);

Answer 1

最多100行，为方便起见，请使用VARIADIC参数。这样，您可以列出单个行，但没有弄清楚行数组的复杂语法。该参数仍然作为函数内的数组可见。详细说明：
- Return rows matching elements of input array in plpgsql function
- PL/pgSQL Array of Rows
在Postgres中使用新的UPSERT实施 9.5 + INSERT ... ON CONFLICT UPDATE：
使用unnest()

CREATE OR REPLACE FUNCTION save_book(VARIADIC thebook book[])
  RETURNS void AS
$func$
BEGIN

INSERT INTO book(id, bname, btype, bprices)  -- spell out target columns!
SELECT *
FROM   unnest(thebook) t
ON     CONFLICT (id) DO UPDATE
SET    bname = excluded.bname                -- excluded key word!
     , btype = excluded.btype
     , bprices = excluded.bprices;

END
$func$  LANGUAGE plpgsql;

呼叫：

SELECT save_book('(111,"the art of living",ABCX, "{190,220}")'
               , '(112,"the art of living",ABCY, "{190,220}")');

如何添加表数据类型数组作为IN参数？

1 个答案: