Question

Conversion failed when converting date and/or time from character string.

Asked by: rwallacej

Hi
I wouldn't think this is difficult todo but I haven't found solution. Its to pick a column from table from a set period. I get error in title from stored procedure "Conversion failed when converting date and/or time from character string."

Thanks in advance for help.



ALTER PROCEDURE [dbo].[GetHistorianDataByField]
      @InputColumnName nvarchar(30),
      @StartDate datetime,
      @EndDate datetime
AS
BEGIN
      -- SET NOCOUNT ON added to prevent extra result sets from
      -- interfering with SELECT statements.
      SET NOCOUNT ON;
 
    -- Insert statements for procedure here
      DECLARE @sql nvarchar(max)
      SET @sql = 'SELECT ' + @InputColumnName + ' FROM HistorianData '
                 + ' WHERE [TIMESTAMP] >= ' + CONVERT(datetime, @StartDate,21) 
    EXEC(@sql)
END
 
 
DECLARE	@return_value int
 
EXEC	@return_value = [dbo].[GetHistorianDataByField]
		@InputColumnName = N'[PI353005]',
		@StartDate = N'2008-01-01 00:00:00',
		@EndDate = N'2009-01-01 00:00:00'
 
SELECT	'Return Value' = @return_value
 
GO

                                  
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Asked On
2009-04-30 at 09:41:53ID24369811
Topic

MS SQL Server

Participating Experts
4
Points
500
Comments
10

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Answers

 

by: aneeshattingalPosted on 2009-04-30 at 09:45:59ID: 24271869

     SET @sql = 'SELECT ' + @InputColumnName + ' FROM HistorianData '
                 + ' WHERE [TIMESTAMP] >= ''' + CONVERT(varchar, @StartDate,21) +''''

 

by: pcelbaPosted on 2009-04-30 at 09:52:15ID: 24271938

ALTER PROCEDURE [dbo].[GetHistorianDataByField]
      @InputColumnName nvarchar(30),
      @StartDate nvarchar(30),
      @EndDate nvarchar(30)
AS

etc.

     SET @sql = 'SELECT ' + @InputColumnName + ' FROM HistorianData '
                 + ' WHERE [TIMESTAMP] >= CONVERT(datetime, @StartDate,21) '

 

by: ezraaPosted on 2009-04-30 at 09:55:39ID: 24271965

I don't think you need to convert the date at all.  Just change the startdate and enddate to varchar instead:

alter PROCEDURE [dbo].[GetHistorianDataByField]
      @InputColumnName nvarchar(30),
      @StartDate varchar(21),
      @EndDate varchar(21)
AS
BEGIN
      -- SET NOCOUNT ON added to prevent extra result sets from
      -- interfering with SELECT statements.
      SET NOCOUNT ON;
 
    -- Insert statements for procedure here
      DECLARE @sql nvarchar(max)
      SET @sql = 'SELECT ' + @InputColumnName + ' FROM HistorianData '
                 + ' WHERE [TIMESTAMP] >= ''' + cast(@StartDate as varchar(21)) + ''''
     EXEC(@sql)
END
 
 
DECLARE @return_value int
 
EXEC    @return_value = [dbo].[GetHistorianDataByField]
                @InputColumnName = N'[PI353005]',
                @StartDate = N'2008-01-01 00:00:00',
                @EndDate = N'2009-01-01 00:00:00'
 
SELECT  'Return Value' = @return_value
 
GO
                                              
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by: pcelbaPosted on 2009-04-30 at 10:03:15ID: 24272040

Another question is TIMESTAMP data type. Is it the SQL timestamp or real datetime value?

And the conversion from Nvarchar to varchar is not necessary:

alter PROCEDURE [dbo].[GetHistorianDataByField]
      @InputColumnName nvarchar(30),
      @StartDate nvarchar(30),
      @EndDate nvarchar(30)
AS
BEGIN
      -- SET NOCOUNT ON added to prevent extra result sets from
      -- interfering with SELECT statements.
      SET NOCOUNT ON;
 
    -- Insert statements for procedure here
      DECLARE @sql nvarchar(max)
      SET @sql = 'SELECT ' + @InputColumnName + ' FROM HistorianData '
                 + ' WHERE [TIMESTAMP] >= ' + @StartDate
     EXEC(@sql)
END
 
 
DECLARE @return_value int
 
EXEC    @return_value = [dbo].[GetHistorianDataByField]
                @InputColumnName = N'[PI353005]',
                @StartDate = N'2008-01-01 00:00:00',
                @EndDate = N'2009-01-01 00:00:00'
 
SELECT  'Return Value' = @return_value
 
GO

                                              
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by: rwallacejPosted on 2009-04-30 at 10:38:45ID: 24272385

Thanks for help,

TIMESTAMP is the SQL datetime

 

by: rwallacejPosted on 2009-04-30 at 10:38:59ID: 24272388

I'll try these tomorrow

 

by: pcelbaPosted on 2009-04-30 at 10:43:01ID: 24272431

Almost alll our examples should work for you.

 

by: mark_willsPosted on 2009-04-30 at 11:41:21ID: 24273084

No need to convert @startdate to datetime - it is already a datetime, but to string it in, should be an understood character string...

e.g.



declare @sql varchar(1000)
declare @startdate datetime

set @startdate = getdate()

set @sql = 'select case when getdate() - 1 > '''   convert(varchar,@startdate,120)   ''' then ''more'' else ''less'' end'

print @sql
exec(@sql)

ALTER PROCEDURE [dbo].[GetHistorianDataByField]
      @InputColumnName nvarchar(30),
      @StartDate datetime,
      @EndDate datetime
AS
BEGIN
      -- SET NOCOUNT ON added to prevent extra result sets from
      -- interfering with SELECT statements.
      SET NOCOUNT ON;
 
    -- Insert statements for procedure here
      DECLARE @sql nvarchar(max)
      SET @sql = 'SELECT '   @InputColumnName   ' FROM HistorianData '
                   ' WHERE [TIMESTAMP] >= '''   CONVERT(varchar, @StartDate,120)  ''''
      EXEC(@sql)
END
GO 
 
DECLARE	@return_value int
 
EXEC	@return_value = [dbo].[GetHistorianDataByField]
		@InputColumnName = N'[PI353005]',
		@StartDate = N'2008-01-01 00:00:00',
		@EndDate = N'2009-01-01 00:00:00'
 
SELECT	'Return Value' = @return_value
 
GO
                                              
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by: mark_willsPosted on 2009-04-30 at 11:46:02ID: 24273121

Interesting, there were plus signs in that example and the attachment when I ran it before....

the two lines of particular interest are :

set @sql = 'select case when getdate() > '''   convert(varchar,@startdate,120)   ''' then ''more'' else ''less'' end'

and in the proc:

                   ' WHERE [TIMESTAMP] >= '''   CONVERT(varchar, @StartDate,120)  ''''


 

by: mark_willsPosted on 2009-04-30 at 11:47:06ID: 24273136

Did it again !!!

set @sql = 'select case when getdate() > ''' + convert(varchar,@startdate,120) + ''' then ''more'' else ''less'' end'

                 + ' WHERE [TIMESTAMP] >= ''' + CONVERT(varchar, @StartDate,120) +''''

20120131-EE-VQP-002

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