在 PL/SQL 函数中返回表

Question

我正在处理一个 SQL 项目。我想创建一个返回表的 sql*Plus 函数。 我做了这样的东西，但它不起作用，我不知道为什么：

CREATE OR REPLACE FUNCTION changeNbPersonnes(recette IN int, nbPersonne IN int)
RETURN table_res TABLE
(
  idIngredient int NOT NULL,
  nomIngredient varchar(255) NOT NULL,
  quantite int NOT NULL
)
AS
  CURSOR curseur_etape IS
  SELECT * FROM IngredientRecette ir
  JOIN recette r
  ON ir.idrecette=r.idrecette
  JOIN ingredient i
  ON ir.idingredient=i.idingredient
  WHERE r.idrecette=recette;
BEGIN
  FOR row_ingredient IS
    INSERT INTO res(idIngredient,nomIngredient,quantite)
    VALUES(
      row_ingredient.idingredient,
      row_ingredient.Nom,
      row_ingredient.quantite
    );
  END FOR;
  RETURN res;
END;
/

你能帮帮我吗？ “RETURN table_res TABLE”有问题

Answer 1

您使用的语法肯定是 Oracle PLSQL 不支持的。在 oracle PLSQL 中，您需要执行以下操作：

-- Create Object of your table
CREATE TYPE TABLE_RES_OBJ AS OBJECT (
     IDINGREDIENT                  INT ,
     NOMINGREDIENT                 VARCHAR (255) ,
     QUANTITE                      INT 
);

--Create a type of your object 
CREATE TYPE TABLE_RES AS TABLE OF TABLE_RES_OBJ;
/

--Function Use the type created as Return Type
CREATE OR REPLACE FUNCTION CHANGENBPERSONNES (
     RECETTE      IN   INT,
     NBPERSONNE   IN   INT)
     RETURN TABLE_RES
AS
     CURSOR CURSEUR_ETAPE
     IS
          SELECT  TABLE_RES_OBJ (IR.*)
            FROM INGREDIENTRECETTE IR 
            JOIN RECETTE R ON IR.IDRECETTE =R.IDRECETTE
                 JOIN INGREDIENT I ON IR.IDINGREDIENT = I.IDINGREDIENT
           WHERE R.IDRECETTE = RECETTE;

     VAR       TABLE_RES:= TABLE_RES();
BEGIN
     OPEN CURSEUR_ETAPE;

     LOOP
          FETCH CURSEUR_ETAPE
          BULK COLLECT INTO VAR LIMIT 100;

          EXIT WHEN CURSEUR_ETAPE%NOTFOUND;
     END LOOP;

     CLOSE CURSEUR_ETAPE;

     RETURN VAR;
END;
/

或者按照@a_horse_with_no_name，使用PipeLine函数，可能如下：

CREATE OR REPLACE FUNCTION CHANGENBPERSONNES (RECETTE      IN INT,
                                              NBPERSONNE   IN INT)
   RETURN TABLE_RES
   PIPELINED
AS
   CURSOR CURSEUR_ETAPE
   IS
      SELECT *
        FROM INGREDIENTRECETTE IR
             JOIN RECETTE R ON IR.IDRECETTE = R.IDRECETTE
             JOIN INGREDIENT I ON IR.IDINGREDIENT = I.IDINGREDIENT
       WHERE R.IDRECETTE = RECETTE;
BEGIN
   FOR i IN CURSEUR_ETAPE
   LOOP
      PIPE ROW (TABLE_RES_OBJ (i.idingredient, i.Nom, i.quantite));
      EXIT WHEN CURSEUR_ETAPE%NOTFOUND;
   END LOOP;

   RETURN;
END;
/