SAP HANA存储过程结果视图调用 沧海

ALTER SESSION SET CURRENT_SCHEMA = SqlScriptDocumentation;

DROP PROCEDURE addDiscount;
CREATE PROCEDURE addDiscount( IN it_books tt_sales_books, OUT ot_books tt_sales_books)
    LANGUAGE SQLSCRIPT READS SQL DATA AS
BEGIN
  ot_Books = SELECT title, CASE WHEN price > 300 THEN (price - (price / 30))
                                ELSE CASE WHEN price > 200 THEN (price - (price / 20))
                                          ELSE (price - (price / 10))
                                     END
                           END AS price, crcy
             FROM :it_books;
END;

DROP PROCEDURE getSalesBooks;
DROP VIEW addDiscount_RET;
CREATE PROCEDURE getSalesBooks( IN minPrice DECIMAL(5, 2), IN currency VARCHAR(3),
                                IN it_books books, OUT ot_sales tt_sales_books)
   LANGUAGE SQLSCRIPT READS SQL DATA WITH RESULT VIEW addDiscount_RET AS
BEGIN
  lt_expensive_books = SELECT title, price, crcy
                       FROM :it_books
                       WHERE price > :minPrice
                       AND crcy = :currency;

  CALL addDiscount(:lt_expensive_books, lt_on_sale);

  lt_cheap_books = SELECT title, price, crcy
                   FROM :it_books
                   WHERE price <= :minPrice
                   AND crcy = :currency;

  ot_sales = CE_UNION_ALL(:lt_on_sale, :lt_cheap_books);
END;

CALL getSalesBooks(1.5, '''EUR''', books, op_sales_books);
TRUNCATE table op_sales_books;
SELECT * FROM addDiscount_RET WITH PARAMETERS ( 'placeholder' = ('$$minprice$$', '1'),
                                     'placeholder' = ('$$currency$$', '''EUR'''),
                                     'placeholder' = ('$$it_books$$', 'books'),
                                     'placeholder' = ('$$ot_sales$$', 'op_sales_books'));
TRUNCATE table op_sales_books;