如何在動態SQL中返回一個值（通過設置一個變量）？

Question

DECLARE @sqlCommand nvarchar(1000) 

DECLARE @countnumber int = 0 

SET @sqlCommand = 'Set @countnumber = (SELECT count(*) from dsnv)' 

EXEC (@sqlCommand) 

print @countnumber ; 

，但我得到的錯誤

Answer 1

使用sp_executesql的輸出參數

DECLARE @countnumber int = 0 

SET @sqlCommand = 'Set @countnumber = (SELECT count(*) from dsnv)' 

exec sp_executesql @sqlCommand, N'@countnumber int OUTPUT', @countnumber OUTPUT 

print @countnumber ;