Question

Parameters not being passed to stored procedure using vb.net

Asked by: TonyHearn

Below is my code which is attempting to pass two parameters to a stored procedure within a sql 2000 database. The parameters expected by the stored procedure are @dateTo and @dateFrom, they are both of type varchar(10).

When I execute my code, vb.net pops up an error to say that the stored procedure 'usp_createFocusView' expects parameter @dateFrom but it has not been supplied.

Where am I going wrong as the parameters are clearly not being passed thru vb.net to the stored procedure?

Many thanks

Dim dateFrom As String
        Dim dateTo As String
 
        dateFrom = dateFromPicker.Text
        dateTo = dateToPicker.Text
 
        Dim connString As String = "Driver={SQL Server};Server=10.10.10.4,1433;Database=UnauthdAbsence;Trusted_Connection=True"
 
        'Builds the Connection and Command object.
        Dim odbcConn As New Odbc.OdbcConnection(connString)
        Dim odbcComm As New Odbc.OdbcCommand("usp_createFocusView", odbcConn)
        odbcComm.CommandType = CommandType.StoredProcedure
 
        'Pass the parameters to the stored procedure
        Dim dateFromParam As New Odbc.OdbcParameter("@dateFrom", SqlDbType.VarChar)
        dateFromParam.Value = dateFrom
        odbcComm.Parameters.Add(dateFromParam)
 
        Dim dateToParam As New Odbc.OdbcParameter("@dateTo", SqlDbType.VarChar)
        dateToParam.Value = dateTo
        odbcComm.Parameters.Add(dateToParam)
 
        Dim odbcDA As New Odbc.OdbcDataAdapter(odbcComm)
 
        'Opens the DB Connection.
        odbcConn.Open()
 
        odbcComm.ExecuteNonQuery()
                                  
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Asked On
2009-09-22 at 02:43:29ID24750909
Tags

microsoft

,

vb.net

,

stored procedure

,

parameter

,

parameters

Topics

.Net Application Servers

,

Visual Basic Programming

,

SQL Query Syntax

Participating Experts
2
Points
250
Comments
13

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Answers

 

by: TonyHearnPosted on 2009-09-22 at 04:39:18ID: 25391619

Upped the points as 125 was a bit stingy

 

by: JerksonPosted on 2009-09-22 at 05:28:22ID: 25391967

Have you tried adding them in the order they appear in the stored procedure definition?

You state your stored proc wants TO and FROm but you're adding them in the order FROM and TO.

I just know Oracle is a little picky on these things, not sure about SQL server

 

by: TonyHearnPosted on 2009-09-22 at 06:06:36ID: 25392319

Hi Jerkson, they are in correct order (dateFrom, dateTo) in both the sproc and vb.net code. My opening question just has them round the wrong way unfortunately.

 

by: craisinPosted on 2009-09-23 at 06:17:10ID: 25402690

You have checked within debugger that "dateFrom" and "dateTo" contain values, heven't you?

If there is no value (empty string or Null) you will get that error message)

 

by: TonyHearnPosted on 2009-09-23 at 06:39:51ID: 25402901

They do indeed contain values, I have since moved from using Parameters.Add as I can't seem to get this to work. I now have the code below. The problem I'm having is now trying to pass the datetime from vb.net to the stored procedure. I get this error when running the code below;

ERROR [42000] [Microsoft][ODBC SQL Server Driver][SQL Server]Error converting data type varchar to datetime.

Which is bizarre as the variables used in vb.net are of type Date, and the stored procedure is expecting variables of type datetime

        Dim dateFrom As Date
        Dim dateTo As Date
 
        'fill variables with date picker values
        dateFrom = dateFromPicker.Value
        dateTo = dateToPicker.Value
 
        Dim connString As String = "Driver={SQL Server};Server=10.10.10.4,1433;Database=UnauthdAbsence;Trusted_Connection=True"
 
        'Builds the Connection and Command object.
        Dim odbcConn As New Odbc.OdbcConnection(connString)
        Dim odbcComm As New Odbc.OdbcCommand("usp_createFocusView '" + dateFrom + "', '" + dateTo + "'", odbcConn)
        odbcComm.CommandType = CommandType.StoredProcedure
        Dim odbcDA As New Odbc.OdbcDataAdapter(odbcComm)
 
        'Opens the DB Connection.
        odbcConn.Open()
 
        odbcComm.ExecuteNonQuery()
                                              
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by: JerksonPosted on 2009-09-23 at 07:18:29ID: 25403315

pass them as varchar and convert them to date on the stored procedure side.


 

by: craisinPosted on 2009-09-23 at 07:44:12ID: 25403650

The parameters MUST be passed as varChar and then converted within the Query's procedure side, as Jerkson has rightly pointed out (beat me to it).

 

by: TonyHearnPosted on 2009-09-23 at 07:47:47ID: 25403709

So what is the declaration in vb.net?

Dim dateFrom as varchar ?

 

by: JerksonPosted on 2009-09-23 at 07:57:20ID: 25403849

no, pass a string from .net into a varchar on the stored proc.

then convert the varcha to date in the stored proc.

 

by: TonyHearnPosted on 2009-09-23 at 08:01:07ID: 25403904

I see, I'll give that a go tomorrow as I'm finished for the day. Many thanks for the suggestions so far

 

by: craisinPosted on 2009-09-23 at 08:01:52ID: 25403915

You can try conversion:

CONVERT(dateFrom,VARCHAR(xx),xx)

I am not certain of the numbers you put in place of the "xx" above since I am not running VB.Net but if you convert the date variables to VarChar() you can then also convert them back within the Query Procedure

 

by: craisinPosted on 2009-09-23 at 08:06:41ID: 25403993

Or even within the query itself such as (an example not related to your code):

SELECT s.OrderNo,SDate,t.Symbol,t.Side,t.Quantity,t.Price
FROM settleTable s WITH (NOLOCK) JOIN ordertable t
ON s.OrderNo = t.OrderNo
WHERE SDate = @date
AND CONVERT(VARCHAR(8),t.timefield,112) = s.sdate
ORDER BY SDate

 

by: TonyHearnPosted on 2009-09-28 at 01:06:52ID: 31631801

Many thanks guys, I've split the points as you both contributed to the thread. Cheers

20120131-EE-VQP-002

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