如何从存储过程返回字符串值

Question

Alter procedure S_Comp(@str1 varchar(20),@r varchar(100) out)
as
declare  @str2 varchar(100)
set @str2  ='welcome to sql server. Sql server is a product of Microsoft'
if(PATINDEX('%'+@str1 +'%',@str2)>0)
    return @str1+'present in the string'
else 
    return @str1+'not present'

我正在执行上面的存储过程.我收到以下错误:

消息245,级别16,状态1,过程S_Comp,行8将varchar值'Amruthanot present'转换为数据类型int时转换失败.

请帮我解决这个问题

Answer 1

您将结果放在RETURN值而不是传递的@r值中.

来自MSDN

(RETURN) 是返回的整数值.存储过程可以将整数值返回给调用过程或应用程序.

改变你的程序.

ALTER procedure S_Comp(@str1 varchar(20),@r varchar(100) out) as 

    declare @str2 varchar(100) 
    set @str2 ='welcome to sql server. Sql server is a product of Microsoft' 
    if(PATINDEX('%'+@str1 +'%',@str2)>0) 
        SELECT @r =  @str1+' present in the string' 
    else 
        SELECT @r = @str1+' not present'

调用程序

  DECLARE @r VARCHAR(100)
  EXEC S_Comp 'Test', @r OUTPUT
  SELECT @r

Answer 2

改变你的

return @str1+'present in the string' ;

至

set @r = @str1+'present in the string'