How to get sp_executesql result into a variable?

问题:

I have a piece of dynamic SQL I need to execute, I then need to store the result into a variable.

I know I can use sp_executesql but can\'t find clear examples around about how to do this.

回答1:

If you have OUTPUT parameters you can do

DECLARE @retval int   
DECLARE @sSQL nvarchar(500);
DECLARE @ParmDefinition nvarchar(500);

DECLARE @tablename nvarchar(50)  
SELECT @tablename = N\'products\'  

SELECT @sSQL = N\'SELECT @retvalOUT = MAX(ID) FROM \' + @tablename;  
SET @ParmDefinition = N\'@retvalOUT int OUTPUT\';

EXEC sp_executesql @sSQL, @ParmDefinition, @retvalOUT=@retval OUTPUT;

SELECT @retval;

But if you don\'t, and can not modify the SP:

-- Assuming that your SP return 1 value
create table #temptable (ID int null)
insert into #temptable exec mysp \'Value1\', \'Value2\'
select * from #temptable

Not pretty, but works.

回答2:

DECLARE @tab AS TABLE (col VARCHAR(10), colu2 varchar(10)) 
  INSERT into @tab EXECUTE  sp_executesql N\'SELECT 1 as col1, 2 as col2 union all SELECT 1 as col1, 2 as col2 union all SELECT 1 as col1, 2 as col2\'

  SELECT * FROM @tab

回答3:

DECLARE @vi INT
DECLARE @vQuery VARCHAR(1000)

SET @vQuery = \'SELECT @vi= COUNT(*) FROM <TableName>\'

EXEC SP_EXECUTESQL 
        @Query  = @vQuery
      , @Params = N\'@vi INT OUTPUT\'
      , @vi = @vi OUTPUT

SELECT @vi

回答4:

Declare @variable int

Exec @variable = proc_name

回答5:

Return values are generally not used to \"return\" a result but to return success (0) or an error number (1-65K). The above all seem to indicate that sp_executesql does not return a value, which is not correct. sp_executesql will return 0 for success and any other number for failure.

In the below, @i will return 2727

DECLARE @s NVARCHAR(500)
DECLARE @i INT;
SET @s = \'USE [Blah]; UPDATE STATISTICS [dbo].[TableName] [NonExistantStatisticsName];\';
EXEC @i = sys.sp_executesql @s
SELECT @i AS \'Blah\'

SSMS will show this Msg 2727, Level 11, State 1, Line 1 Cannot find index \'NonExistantStaticsName\'.

回答6:

If you want to return more than 1 value use this:

DECLARE @sqlstatement2      NVARCHAR(MAX);
DECLARE @retText            NVARCHAR(MAX);  
DECLARE @ParmDefinition     NVARCHAR(MAX);
DECLARE @retIndex           INT = 0;

SELECT @sqlstatement = \'SELECT @retIndexOUT=column1 @retTextOUT=column2 FROM XXX WHERE bla bla\';

SET @ParmDefinition = N\'@retIndexOUT INT OUTPUT, @retTextOUT NVARCHAR(MAX) OUTPUT\';

exec sp_executesql @sqlstatement, @ParmDefinition, @retIndexOUT=@retIndex OUTPUT, @retTextOUT=@retText OUTPUT;

returned values are in @retIndex and @retText

回答7:

DECLARE @ValueTable TABLE ( Value VARCHAR (100) )

                    SELECT @sql = N\'SELECT SRS_SizeSetDetails.\'+@COLUMN_NAME+\' FROM SRS_SizeSetDetails WHERE FSizeID = \'\'\'+@FSizeID+\'\'\' AND SRS_SizeSetID = \'\'\'+@SRS_SizeSetID+\'\'\'\';

                    INSERT INTO @ValueTable
                    EXEC sp_executesql @sql;

                    SET @Value=\'\';

                    SET @Value = (SELECT TOP 1  Value FROM @ValueTable)

                    DELETE FROM @ValueTable

回答8:

This was a long time ago, so not sure if this is still needed, but you could use @@ROWCOUNT variable to see how many rows were affected with the previous sql statement.

This is helpful when for example you construct a dynamic Update statement and run it with exec. @@ROWCOUNT would show how many rows were updated.

Here is the definition

回答9:

This worked for me:

DECLARE @SQL NVARCHAR(4000)

DECLARE @tbl Table (
    Id int,
    Account varchar(50),
    Amount int
) 

-- Lots of code to Create my dynamic sql statement

insert into @tbl EXEC sp_executesql @SQL

select * from @tbl