如何存储 EXEC sys.sp_executesql 的结果

Question

如何将 exec 的结果存储到变量中？

这是我将数据存储在变量中的尝试：

DECLARE @oltp VARCHAR(50) SET @oltp = 'emp'
DECLARE @wh VARCHAR(25) SET @wh = '_wh'
DECLARE @DatabaseName SYSNAME = @oltp + @wh;
DECLARE @oltp_data_days NVARCHAR(500)
DECLARE @Params NVARCHAR(500)
DECLARE @vi int

SET @oltp_data_days = N'(SELECT datediff(DAY, MIN(business_date), GETDATE()) AS keep_days
        FROM '+QUOTENAME(@DatabaseName)+'..sales 
        WHERE business_date > ''1/1/2000 00:00:00'')'

EXEC sp_executesql  @oltp_data_days  = @oltp_data_days
      , @Params = N'@vi INT OUTPUT'
      , @vi = @vi OUTPUT

我得到的结果为 Null。

Answer 1

像这样：

declare @sql nvarchar(max) = N'set @vi = (select 3 as keep_days)'
declare @vi int

exec sp_executesql @sql, N'@vi int output', @vi = @vi output

select @vi

如何存储 EXEC sys.sp_executesql 的结果

How to store result of EXEC sys.sp_executesql

sql

tsql

sql-server

stored-procedures

exec