如何将代码从SQL Server转换为Oracle

Question

我在SQL Server中编写了此代码。我想为Oracle和PL/SQL编写此代码。任何人都可以帮助我如何做这份工作？

SQL服务器/ T-SQL：

ALTER TRIGGER [dbo].[checkBalance] 
    ON [dbo].[Orders] 
FOR insert 
AS 
BEGIN 
    IF (SELECT goodcount FROM goods WHERE id=(SELECT gid FROM Inserted)) < (SELECT gcount FROM Inserted) 
    BEGIN 
     RAISERROR ('Inventory is low',10,1) 
     rollback 
    END 

Answer 1

这将是这样的

CREATE OR REPLACE TRIGGER MySchema.checkBalance 
AFTER INSERT 
    ON MySchema.Orders FOR EACH ROW 
DECLARE 
    v_count pls_integer; 
BEGIN 
    SELECT goodcount INTO v_count FROM goods WHERE id = :new.gid; 
    If v_count < :new.gcount Then 
     raise_application_error (-20001,'Low inventory.'); 
    End If; 
END;