Calling Method To Do Executescalar With Parameters

Feb 15, 2008

I have a method like follows:

string EmpCount = null;

DateTime _dtstart = Convert.ToDateTime(txtStart.Text.Trim());

DateTime _dtend = Convert.ToDateTime(txtEnd.Text.Trim());SQLProvider sqlp = new SQLProvider(System.Configuration.ConnectionStrings["ConString"].ConnectionString);string SqlText = @"

select count(*) from employee

where activeemp=1 and startdate BETWEEN  @dtstart and @dtend;

using (sqlp.Connection) {

sqlpm [] param = {

 new sqlpm("dtStart", _dtstart),

 new SqlP("dtEnd", _dtend)

 };

 }EmpCount = sqlp.ExecuteScalar(SqlText, param).ToString();

return Convert.ToInt32(mbrCount);

 

Then the method I am calling is:public Object ExecuteScalar(String sqlText, Sqlp[] param)

{try

{

//Some Code here

}

}

So in the calling method (ExecuteScalar), the second parameter is defined as an array, is it ok to have an array in the called method too?

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Sample:
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Hello All,

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I'm trying to write an esqlc program that will run a stored procedure that returns several output parameters. I haven't been able to find any documentation to date that explains how to run the "EXEC SQL EXECUTE procname" command and specify the output parameters.

My stored procedure "aek_proc1" takes one input parameter (p1 - an 8-character string) and 3 output parameters (p2 - an integer; p3 - an 8-character string, and p4 a 40-character string).

My esqlc program contains the following code….

EXEC SQL BEGIN DECLARE SECTION;
char p1[9];
int p2;
char p3[9];
char p4[41];
WXEC SQL END DECLARE SECTION;

sprintf(&p1[0], "GL");
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sprintf(&p3[0], "");
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:p2 OUTPUT,
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I am getting errors at runtime about constants being passed for OUTPUT parameters.

I can run the same stored procedure in Query Analyser and it works beautifully (see below)

declare @p1 char(8)
declare @p2 integer
declare @p3 char(8)
declare @p4 char(40)

set @p1 = 'GL'

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I'd really appreciate any advice you can offer!!

I've spend hours browsing this newsgroup and found lots of examples of how to do this in VB and from Query Analyser but I can't find any examples for ESQL/C that work.

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I have a couple of questions that I hope someone might be able to provide some direction on.



1. Why can't you call a proc when the proc uses temp tables? I wrote a simple proc (select * from table) and the data subscription works perfect. I then take that same query and put it into a temp table and the data set can't be validated by the subscription, Why?



2. Why can't you pass a simple execute statement in a data subscription? (execute dbo.RptTakeTheLeadFLSDinnerCompetition @FiscalQuarter ='2007-Q3', @StoreRegionID = '9231', @StoreType = 'Full-Line Store') works perfect in SQL but once you try and validate in the data subscription is fails.



3. Another question, why if I dumb down the proc and the number of parameters does it work? Are there limitations on the number of parameters you can pass into a proc from a data driven subscription?



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This seems to be much more difficult than it was in DTS (or perhaps I just need to adjust to the new way of doing things).

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By the way, is this the best way to call a stored procedure with parameters?

I have pasted the stored procedure at the end of this posting because I have come accross a puzzling problem. The query as shown below works correctlly but if I un-comment the delete statement, the preview still works and the columns are still avilable for mapping but I get the following errors when the package is executed.


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At one stage the stored procedure used a temp table and later I also experimented with a table variable. In both cases I got similar errors at execution time. In the case of the temp table there was another problem in that, while the preview worked, there were no columns available for mapping. Using a table variable seemed to overcome this problem but I still got the run time error. eventually I found a way to avoid using either a temp table or a table variable and the package then worked correctly, copying the data into the desitnation table.

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ALTER procedure [dbo].[usp_ValveStatusForDay]

(

@dateTime DateTime,

@reportName VarChar(100)

)

AS

BEGIN

DECLARE @day VarChar(10)

DECLARE @month VarChar(10)

DECLARE @year VarChar(10)

DECLARE @start VarChar(25)

DECLARE @end VarChar(25)

SET @day = Convert(Varchar(10),DatePart(day, @dateTime))

SET @month = Convert(VarChar(10), DatePart(month, @dateTime))

SET @year = Convert(VarChar(10), DatePart(year, @dateTime))

IF @month = '1' SET @month = 'Jan'

IF @month = '2' SET @month = 'Feb'

IF @month = '3' SET @month = 'Mar'

IF @month = '4' SET @month = 'Apr'

IF @month = '5' SET @month = 'May'

IF @month = '6' SET @month = 'Jun'

IF @month = '7' SET @month = 'Jul'

IF @month = '8' SET @month = 'Aug'

IF @month = '9' SET @month = 'Sep'

IF @month = '10' SET @month = 'Oct'

IF @month = '11' SET @month = 'Nov'

IF @month = '12' SET @month = 'Dec'

SET @start = @day + ' ' + @month + ' ' + @year + ' 00:00:00'

SET @end = @day + ' ' + @month + ' ' + @year + ' 23:59:59'

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exec dbo.usp_ValveStats_ReportName @reportName, @start, @end, '1h'

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Hi

This is the code which I have written in code window.

Public Shared Function CalcLocalFactor(ByVal CalcLifeCode As Integer, ByVal CalcFiscalAge As Integer, ByVal CalcLifeYearsUsed As Double, ByVal CalcLocConvention As String, ByVal CalcSRate As Integer) As Double
Dim locCalcFiscalAge As Integer = 0
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Dim REM1 As Integer = 1
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Dim YR As Integer
Dim HALF_YEAR As Double
Dim LINEAR As Double
Dim MACR As Double
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How can I dynamically change the parameter values of the function?

Parameter is not accepting directly the field names, hence I used other parameter to initialize the field and used that parameter for this.

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Other parameter: FieldInDate (internal) FieldName : InDate

While initializing the new parameter CalcPurchDate,, I used an expression for this: Parameters!CalcFiscalAge.Value

=iif(Parameters!FieldPurchDate.Value is nothing, Parameters!FieldInDate.Value,Parameters!FieldPurchDate.Value)

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These are some of the things , I am doing ....

Please let me know how to fix this issue...

Thanks in advance

Regards,

Radhika

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Getting GUID Value From StoredProcedure.ExecuteScalar()

Jun 12, 2008

I need to execute stored procedure which is suppose to return GUID to my IF statement and if it is Nothing I execute other Stored procedures else some other procedures. My problem is that even though by looking at the data I know that after the execution of the procedure it should return some guid value it doesn't anybody who had the same issue??? That is the code block where I am trying to return guid from my stored procedure:   getGroupID.Parameters("@GroupName").Value = dr.Item("Group ID").ToString()            If getGroupID.ExecuteScalar() = Nothing Then                'Find Group by IP address if input Data Table doesn't have group                getGroupIDByIP.Parameters("@IP").Value = dr.Item("IP").ToString()                If getGroupIDByIP.ExecuteScalar() = Nothing Then                    insertGroup.Parameters("@GroupID").Value = Guid.NewGuid                    insertGroup.Parameters("@Group").Value = dr.Item("Group ID")                    insertGroup.Parameters("@ACCID").Value = getAccID.ExecuteScalar()                    insertGroup.ExecuteNonQuery()                    command.Parameters("@Group_ID").Value = getGroupID.ExecuteScalar()                Else                    command.Parameters("@Group_ID").Value = getGroupIDByIP.ExecuteScalar()                End If            Else                command.Parameters("@Group_ID").Value = getGroupID.ExecuteScalar()            End If Thank you 

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ExecuteScalar Returns Null

Oct 25, 2006

I am using the following C# code and T-SQL to get result object from aSQL Server database. When my application runs, the ExecuteScalarreturns "10/24/2006 2:00:00 PM" if inserting a duplicated record. Itreturns null for all other conditions. Does anyone know why? Doesanyone know how to get the output value? Thanks.------ C# -----aryParams = {'10/24/2006 2pm', '10/26/2006 3pm', 2821077, null};object oRtnObject = null;StoredProcCommandWrapper =myDb.GetStoredProcCommandWrapper(strStoredProcName ,aryParams);oRtnObject = myDb.ExecuteScalar(StoredProcCommandWrapper);------ T-SQL ---ALTER PROCEDURE [dbo].[procmyCalendarInsert]@pBegin datetime,@pEnd datetime,@pUserId int,@pOutput varchar(200) outputASBEGINSET NOCOUNT ON;select * from myCalendarwhere beginTime >= @pBegin and endTime <= @pEnd and userId = @pUserIdif @@rowcount <0beginprint 'Path 1'set @pOutput = 'Duplicated reservation'select @pOutput as 'Result'return -1endelsebeginprint 'Path 2'-- check if upperlimit (2) is reachedselect rtrim(cast(beginTime as varchar(30))) + ', ' +rtrim(cast(endTime as varchar(30))),count(rtrim(cast(beginTime as varchar(30))) + ', ' +rtrim(cast(endTime as varchar(30))))from myCalendargroup by rtrim(cast(beginTime as varchar(30))) + ', ' +rtrim(cast(endTime as varchar(30)))having count(rtrim(cast(beginTime as varchar(30))) + ', ' +rtrim(cast(endTime as varchar(30)))) =2and (rtrim(cast(beginTime as varchar(30))) + ', ' +rtrim(cast(endTime as varchar(30))) =rtrim(cast(@pBegin as varchar(20)))+ ', ' + rtrim(cast(@pEnd asvarchar(20))))-- If the @@rowcount is not equal to 0 then-- at the time between @pBegin and @pEnd the maximum count of 2 isreachedif @@rowcount <0beginprint 'Path 3'set @pOutput = '2 reservations are already taken for the hours'select @pOutput as 'Result'return -1endelsebeginprint 'Path 4'--safe to insertinsert dbo.myCalendar(beginTime, endTime,userId)values (@pBegin, @pEnd, @pUserId)if @@error = 0beginprint 'Path 4:1 @@error=' + cast(@@error as varchar(1))print 'Path 4:1 @@rowcount=' + cast(@@rowcount as varchar(1))set @pOutput = 'Reservation succeeded'select @pOutput as 'Result'return 0endelsebeginprint 'Path 4:2 @@rowcount=' + cast(@@rowcount as varchar(1))set @pOutput = 'Failed to make reservation'select @pOutput as 'Result'return -1endendendEND

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Getting NullReferenceException When Executing ExecuteScalar()

Nov 20, 2007

I'm trying to add user information to the database however I'm getting a NullReferenceException.

Here's the code:


SqlCommand UserAddCommand = new SqlCommand();

int AssignedUserID = 0;

UserAddCommand.CommandType = CommandType.StoredProcedure;

UserAddCommand.Connection = m_DBConnection;

UserAddCommand.CommandText = "SP_UserAdd";

UserAddCommand.Parameters.AddWithValue("@User_Name", DbType.String);

UserAddCommand.Parameters.AddWithValue("@Street_Address", DbType.String);

UserAddCommand.Parameters.AddWithValue("@City", DbType.String);

UserAddCommand.Parameters.AddWithValue("@State", DbType.AnsiStringFixedLength);

UserAddCommand.Parameters.AddWithValue("@Zip_Code", DbType.AnsiStringFixedLength);

UserAddCommand.Parameters.AddWithValue("@Email_Address", DbType.String);

UserAddCommand.Parameters.AddWithValue("@Phone_Number", DbType.AnsiStringFixedLength);

UserAddCommand.Parameters.AddWithValue("@User_Login_Name", DbType.String);

UserAddCommand.Parameters.AddWithValue("@User_Password", DbType.String);

UserAddCommand.Parameters.AddWithValue("@Referrer_Name", DbType.AnsiStringFixedLength);

UserAddCommand.Parameters.AddWithValue("@User_Type", DbType.AnsiStringFixedLength);

UserAddCommand.Parameters["@User_Name"].Value = UserInfo.Name;

UserAddCommand.Parameters["@Street_Address"].Value = UserInfo.StreetAddress;

UserAddCommand.Parameters["@City"].Value = UserInfo.City;

UserAddCommand.Parameters["@State"].Value = UserInfo.State;

UserAddCommand.Parameters["@Zip_Code"].Value = UserInfo.ZipCode;

UserAddCommand.Parameters["@Email_Address"].Value = UserInfo.EmailAddress;

UserAddCommand.Parameters["@Phone_Number"].Value = UserInfo.PhoneNumber;

UserAddCommand.Parameters["@User_Login_Name"].Value = UserInfo.UserName;

UserAddCommand.Parameters["@User_Password"].Value = UserInfo.UserPassword;

UserAddCommand.Parameters["@Referrer_Name"].Value = UserInfo.ReferrerName;

if ((int)UserInfo.User_Type == (int)ClassUserInfo.UserType.FAMILY)

{

UserAddCommand.Parameters["@User_Type"].Value = "Family";

}

else if ((int)UserInfo.User_Type == (int)ClassUserInfo.UserType.FRIEND)

{

UserAddCommand.Parameters["@User_Type"].Value = "Friend";

}

else if ((int)UserInfo.User_Type == (int)ClassUserInfo.UserType.MANAGER)

{

UserAddCommand.Parameters["@User_Type"].Value = "Manager";

}

else if ((int)UserInfo.User_Type == (int)ClassUserInfo.UserType.OWNER)

{

UserAddCommand.Parameters["@User_Type"].Value = "Owner";

}

try

{

AssignedUserID = (int)UserAddCommand.ExecuteScalar(); this line of code produces the NullReferenceException

UserInfo.UserID = AssignedUserID;

m_UserInfo = UserInfo;

}

catch (Exception Ex)

{

Console.WriteLine(Ex.ToString());

}



Please help me figure out what I am doing wrong.

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Update Method Is Not Finding A Nongeneric Method!!! Please Help

Jan 29, 2008

Hi,
 I just have a Dataset with my tables and thats it
 I have a grid view with several datas on it
no problem to get the data or insert but as soon as I try to delete or update some records the local machine through the same error
Unable to find nongeneric method...
I've try to create an Update query into my table adapters but still not working with this one
Also, try to remove the original_{0} and got the same error...
 Please help if anyone has a solution
 
Thanks

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ExecuteScalar Returns 0 (null) But INSERT Is Successful.

Sep 25, 2007



I have code that has worked just fine for some time, and now all of the sudden I am having an issue. I have a simple INSERT statement built and then make the following call:


RecordID = cmd.ExecuteScalar


I have never had a problem with this before. The RecordID of the newly inserted record is returned into the RecordID Integer varibale. All of the sudden, the varibale has a value of 0 (null I assume is being returned), but yet the INSERT worked just fine. I can check the table in SQL and it is populated with no issues.

No exception is thrown of any type or anything. Does anybody know what may be happening?

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ExecuteScalar --&> How To Get The OrderID(Identity) From A Table To Another Table ??

Mar 23, 2006

I am new to asp.net and studying on book.. currently i am stuck with a problem which not understand what is it !! Can anyone help me ?? I trying a shopping cart "Check Out" method, and when i am done the process.. My order_lines Table can update the OrderID which just generated !! What wrong with the statement ??  
 
Protected Sub Wizard1_FinishButtonClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.WizardNavigationEventArgs) Handles Wizard1.FinishButtonClick        ' Insert the order and order lines into the database        Dim conn As SqlConnection = Nothing        Dim trans As SqlTransaction = Nothing        Dim cmd As SqlCommand
        Try            conn = New SqlConnection(ConfigurationManager.ConnectionStrings("ConnectionString").ConnectionString)            conn.Open()            trans = conn.BeginTransaction            cmd = New SqlCommand()            cmd.Connection = conn            cmd.Transaction = trans
            ' set the order details            cmd.CommandText = "INSERT INTO Orders(MemberName, OrderDate, Name, Address, City, State, PostCode, Country, Total) VALUES (@MemberName, @OrderDate, @Name, @Address, @City,@State, @PostCode, @Country, @Total)"            cmd.Parameters.Add("@MemberName", Data.SqlDbType.VarChar, 50)            cmd.Parameters.Add("@OrderDate", Data.SqlDbType.DateTime)            cmd.Parameters.Add("@Name", Data.SqlDbType.VarChar, 50)            cmd.Parameters.Add("@Address", Data.SqlDbType.VarChar, 255)            cmd.Parameters.Add("@City", Data.SqlDbType.VarChar, 50)            cmd.Parameters.Add("@State", SqlDbType.VarChar, 50)            cmd.Parameters.Add("@PostCode", Data.SqlDbType.VarChar, 15)            cmd.Parameters.Add("@Country", Data.SqlDbType.VarChar, 50)            cmd.Parameters.Add("@Total", Data.SqlDbType.Money)
            cmd.Parameters("@MemberName").Value = User.Identity.Name            cmd.Parameters("@OrderDate").Value = DateTime.Now()            cmd.Parameters("@Name").Value = CType(Wizard1.FindControl("txtName"), TextBox).Text            cmd.Parameters("@Address").Value = CType(Wizard1.FindControl("txtAddress"), TextBox).Text            cmd.Parameters("@City").Value = CType(Wizard1.FindControl("txtCity"), TextBox).Text            cmd.Parameters("@State").Value = CType(Wizard1.FindControl("txtState"), TextBox).Text            cmd.Parameters("@PostCode").Value = CType(Wizard1.FindControl("txtPostCode"), TextBox).Text            cmd.Parameters("@Country").Value = CType(Wizard1.FindControl("txtCountry"), TextBox).Text            cmd.Parameters("@Total").Value = Profile.Basket.Total
            Dim OrderID As Integer            OrderID = Convert.ToInt32(cmd.ExecuteScalar())  <-- Is it wrong or need to add wat ?            ' change the query and parameters for the order lines            cmd.CommandText = "INSERT INTO OrderLines(OrderID, ProductID,Quantity, Price) VALUES (@OrderID, @ProductID, @Quantity, @Price)"            cmd.Parameters.Clear()            cmd.Parameters.Add("@OrderID", Data.SqlDbType.Int)            cmd.Parameters.Add("@ProductID", Data.SqlDbType.Int)            cmd.Parameters.Add("@Quantity", Data.SqlDbType.Int)            cmd.Parameters.Add("@Price", Data.SqlDbType.Money)            cmd.Parameters("@OrderID").Value = OrderID
            For Each item As CartItem In Profile.Basket.Items                cmd.Parameters("@ProductID").Value = item.ProductID                cmd.Parameters("@Quantity").Value = item.Quantity                cmd.Parameters("@Price").Value = item.UnitPrice                cmd.ExecuteNonQuery()            Next            ' commit the transaction            trans.Commit()        Catch SqlEx As SqlException            ' some form of error - rollback the transaction            ' and rethrow the exception            If trans IsNot Nothing Then                trans.Rollback()            End If            ' Log the exception            Throw
        Finally            If conn IsNot Nothing Then                conn.Close()            End If        End Try        ' we will only reach here if the order has been created successfully        ' so clear the cart        Profile.Basket.Items.Clear()    End Sub

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ADO.NET 2-VB 2005 Express Form1:Printing Output Of Returned Data/Parameters From The Parameters Collection Of A Stored Procedure

Mar 12, 2008

Hi all,
From the "How to Call a Parameterized Stored Procedure by Using ADO.NET and Visual Basic.NET" in http://support.microsft.com/kb/308049, I copied the following code to a project "pubsTestProc1.vb" of my VB 2005 Express Windows Application:


Imports System.Data

Imports System.Data.SqlClient

Imports System.Data.SqlDbType

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim PubsConn As SqlConnection = New SqlConnection("Data Source=.SQLEXPRESS;integrated security=sspi;" & "initial Catalog=pubs;")

Dim testCMD As SqlCommand = New SqlCommand("TestProcedure", PubsConn)

testCMD.CommandType = CommandType.StoredProcedure

Dim RetValue As SqlParameter = testCMD.Parameters.Add("RetValue", SqlDbType.Int)

RetValue.Direction = ParameterDirection.ReturnValue

Dim auIDIN As SqlParameter = testCMD.Parameters.Add("@au_idIN", SqlDbType.VarChar, 11)

auIDIN.Direction = ParameterDirection.Input

Dim NumTitles As SqlParameter = testCMD.Parameters.Add("@numtitlesout", SqlDbType.Int)

NumTitles.Direction = ParameterDirection.Output

auIDIN.Value = "213-46-8915"

PubsConn.Open()

Dim myReader As SqlDataReader = testCMD.ExecuteReader()

Console.WriteLine("Book Titles for this Author:")

Do While myReader.Read

Console.WriteLine("{0}", myReader.GetString(2))

Loop

myReader.Close()

Console.WriteLine("Return Value: " & (RetValue.Value))

Console.WriteLine("Number of Records: " & (NumTitles.Value))

End Sub

End Class

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
The original article uses the code statements in pink for the Console Applcation of VB.NET. I do not know how to print out the output of ("Book Titles for this Author:"), ("{0}", myReader.GetString(2)), ("Return Value: " & (RetValue.Value)) and ("Number of Records: " & (NumTitles.Value)) in the Windows Application Form1 of my VB 2005 Express. Please help and advise.

Thanks in advance,
Scott Chang

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