sql-server – SQL Server – 声明变量但仍然说“必须声明标量变量”

我试图在Microsoft sql Server上运行这套sql命令,但是我收到这个错误：

Msg 137,Level 15,State 1,Line 1
Must declare the scalar variable “@dbstatus”.

我以为我已经声明了变量,所以我不知道为什么它仍然抛出错误？

DECLARE @dbname nvarchar(100) 
DECLARE @dbstatus varchar(500) 
DECLARE @sqlCommand NVARCHAR(1000) 
create table #temptable (dbname nvarchar(100),status varchar(500))

DECLARE c1 CURSOR READ_ONLY 
FOR 
   SELECT '[' + name + ']'   FROM sys.databases WHERE name = 'EDDS1084543'

OPEN c1  
FETCH NEXT FROM c1 INTO @dbname 

WHILE @@FETCH_STATUS = 0 
BEGIN            
      SET @sqlCommand = 'SET @dbstatus = (SELECT Status FROM ' + @dbname + '.[EDDSDBO].[dtSearchIndex])'   

      EXECUTE sp_executesql @sqlCommand

      INSERT INTO #tempTable(dbname,[status])VALUES (@dbname,@dbstatus)

      FETCH NEXT FROM c1 INTO @dbname   
END   

CLOSE c1 
DEALLOCATE c1

解决方法

EXEC / sp_executesql向sql Server创建一个新的连接(SPID),而不是您当前的会话,因此无法看到该变量.检查 the documentation.

基本上,您必须声明要传入该调用的参数,并给它一个值.在这种情况下,两者必须包括OUTPUT说明符.

EXECUTE sp_executesql @sqlCommand,'@dbstatus varchar(500) output',@dbstatus output