Question

我在存储过程中获取了一些参数。在对这些参数进行操作之前，我想验证它们，如果参数不符合要求，那么我想从存储过程中退出并显示错误消息。

示例代码：

   create proc abcd
    (
       zip   varchar(20),
       name   varchar(20),
       network varchar(1)
    )

    -- validation section
    IF (len(zip)<>5 OR LEN(zip)<>9)
    begin
          print "The zip must be of 5 or 9 characters"
          <---- how to exit from here--->
    end
    IF (len(name)<2)
    begin
          print "The name must be of at least 2 characters"
          <---- how to exit from here--->
    end

---- main code

如上所述，如果出现错误，如何退出程序？

Answer 1

您可以使用return命令，如下所示

-- validation section
IF (len(zip)<>5 OR LEN(zip)<>9)
begin
      print "The zip must be of 5 or 9 characters"
      return 1
end
IF (len(name)<2)
begin
      print "The name must be of at least 2 characters"
      return 2
end

return 0 -- on the end of procedure

要捕获结果，您可以使用此代码：

declare @ProcResult int
execute @ProcResult = abcd @Zip = ..., @name...  
select @ProcResult

Answer 2

让我建议一些改变：

create procedure abcd
       @zip     varchar(20),
       @name    varchar(20),
       @network varchar(1)
AS
    -- validation section
    IF (len(@zip)<>5 AND LEN(@zip)<>9)
    begin
          -- print "The zip must be of 5 or 9 characters"
          raiserror 20000 "The zip must be of 5 or 9 characters"
          return 1
    end
    IF (len(@name)<2)
    begin
          -- print "The name must be at least 2 characters"
          raiserror 20001 "The name must be at least 2 characters"
          return 2
    end

raiserror有很多选项，但这应该指向正确的方向。

编辑：添加了返回语句

退出sybase中的存储过程

2 个答案: