Pass In Null Value For Boolean Data Type In VB

May 5, 2004

What is the syntax to pass in null value for boolean data type in VB in the stored procedure?

This is what I tried and it doesn't work.
.Parameters.Append .CreateParameter("@disposition", adBoolean, adParamInput, 1, vbNull)

Thank you.

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This is nutty.  I never got this error on my local machine.  The only lower case m in the sql is by near the variable Ratingsum like in line 59.
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 Here is my button click sub in its entirety:
 1 Sub btnRating_Click(ByVal Src As Object, ByVal E As EventArgs)
2 'Variable declarations...
3 Dim articleid As Integer
4 articleid = Request.QueryString("aid")
5 Dim strSelectQuery, strInsertQuery As String
6 Dim strCon As String
7 Dim conMyConnection As New System.Data.SqlClient.SqlConnection()
8 Dim cmdMyCommand As New System.Data.SqlClient.SqlCommand()
9 Dim dtrMyDataReader As System.Data.SqlClient.SqlDataReader
10 Dim MyHttpAppObject As System.Web.HttpContext = _
11 System.Web.HttpContext.Current
12 Dim strRemoteAddress As String
13 Dim intSelectedRating, intCount As Integer
14 Dim Ratingvalues As Decimal
15 Dim Ratingnums As Decimal
16 Dim Stars As Decimal
17 Dim Comments As String
18 Dim active As Boolean = False
19 Me.lblRating.Text = ""
20 'Get the user's ip address and cast its type to string...
21 strRemoteAddress = CStr(MyHttpAppObject.Request.UserHostAddress)
22 'Build the query string. This time check to see if IP address has already rated this ID.
23 strSelectQuery = "SELECT COUNT(*) As RatingCount "
24 strSelectQuery += "FROM tblArticleRating WHERE Itemid=" & articleid
25 strSelectQuery += " AND ip = '" & strRemoteAddress & "'"
26 'Open the connection, and execute the query...
27 strCon = System.Web.Configuration.WebConfigurationManager.ConnectionStrings("sqlConnectionString").ConnectionString
28 conMyConnection.ConnectionString = strCon
29 conMyConnection.Open()
30 cmdMyCommand.Connection = conMyConnection
31 cmdMyCommand.CommandType = System.Data.CommandType.Text
32 cmdMyCommand.CommandText = strSelectQuery
33 intCount = cmdMyCommand.ExecuteScalar()
34 intSelectedRating = Int(Me.rbRating.Text)
35 conMyConnection.Close()
36 'Close the connection to release these resources...
37
38 If intCount = 0 Then 'The user hasn't rated the article
39 'before, so perform the insert...
40 strInsertQuery = "INSERT INTO tblArticleRating (rating, ip, itemID, comment, active) "
41 strInsertQuery += "VALUES ("
42 strInsertQuery += intSelectedRating & ", '"
43 strInsertQuery += strRemoteAddress & "', "
44 strInsertQuery += articleid & ", '"
45 strInsertQuery += comment.Text & "', '"
46 strInsertQuery += active & "'); "
47 cmdMyCommand.CommandText = strInsertQuery
48 conMyConnection.Open()
49 cmdMyCommand.ExecuteNonQuery()
50 conMyConnection.Close()
51 Me.lblRating.Text = "Thanks for your vote!"
52 Comments = comment.Text.ToString
53
54 If Len(Comments) > 0 Then
55 emailadmin(comment.Text, articleid)
56 End If
57 'now update the article db for the two values but first get the correct ratings for the article
58 strSelectQuery = _
59 "SELECT SUM(rating) As RatingSum, COUNT(*) As RatingCount "
60 strSelectQuery += "FROM tblArticleRating WHERE Itemid=" & articleid
61 conMyConnection.Open()
62 cmdMyCommand.CommandText = strSelectQuery
63 dtrMyDataReader = cmdMyCommand.ExecuteReader()
64 dtrMyDataReader.Read()
65 Ratingvalues = Convert.ToDecimal(dtrMyDataReader("RatingSum").ToString)
66 Ratingnums = Convert.ToDecimal(dtrMyDataReader("RatingCount").ToString)
67 Stars = Ratingvalues / Ratingnums
68 conMyConnection.Close()
69 'Response.Write("Values: " & Ratingvalues)
70 'Response.Write("Votes: " & Ratingnums)
71
72 UpdateRating(articleid, Stars, Ratingnums)
73 Else 'The user has rated the article before, so display a message...
74 Me.lblRating.Text = "You've already rated this article"
75 End If
76 strSelectQuery = _
77 "SELECT SUM(rating) As RatingSum, COUNT(*) As RatingCount "
78 strSelectQuery += "FROM tblArticleRating WHERE Itemid=" & articleid
79 conMyConnection.Open()
80 cmdMyCommand.CommandText = strSelectQuery
81 dtrMyDataReader = cmdMyCommand.ExecuteReader()
82 dtrMyDataReader.Read()
83 Ratingvalues = Convert.ToDecimal(dtrMyDataReader("RatingSum").ToString)
84 Ratingnums = Convert.ToDecimal(dtrMyDataReader("RatingCount").ToString)
85 Stars = Ratingvalues / Ratingnums
86 If (Ratingnums = 1) And (Stars <= 1) Then
87 lblRatingCount.Text =" (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Vote"
88 ElseIf (Ratingnums = 1) And (Stars > 1) Then
89 lblRatingCount.Text = " (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Vote"
90 ElseIf (Ratingnums > 1) And (Stars <= 1) Then
91 lblRatingCount.Text =" (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Votes"
92 ElseIf (Ratingnums > 1) And (Stars > 1) Then
93 lblRatingCount.Text = " (" & (String.Format("{0:f2}", Stars)) & ") / " & dtrMyDataReader("RatingCount") & " Votes"
94 End If
95
96 'Response.Write(String.Format("{0:f2}", Stars))
97 'Response.Write("Values: " & Ratingvalues)
98 'Response.Write("Votes: " & Ratingnums)
99 If (Stars > 0) And (Stars <= 0.5) Then
100 Me.Rating.ImageUrl ="./images/rating/05star.gif"
101 ElseIf (Stars > 0.5) And (Stars < 1.0) Then
102 Me.Rating.ImageUrl = "./images/rating/05star.gif"
103 ElseIf (Stars >= 1.0) And (Stars < 1.5) Then
104 Me.Rating.ImageUrl = "./images/rating/1star.gif"
105 ElseIf (Stars >= 1.5) And (Stars < 2.0) Then
106 Me.Rating.ImageUrl = "./images/rating/15star.gif"
107 ElseIf (Stars >= 2.0) And (Stars < 2.5) Then
108 Me.Rating.ImageUrl = "./images/rating/2star.gif"
109 ElseIf (Stars >= 2.5) And (Stars < 3.0) Then
110 Me.Rating.ImageUrl = "./images/rating/25star.gif"
111 ElseIf (Stars >= 3.0) And (Stars < 3.5) Then
112 Me.Rating.ImageUrl = "./images/rating/3star.gif"
113 ElseIf (Stars >= 3.5) And (Stars < 4.0) Then
114 Me.Rating.ImageUrl = "./images/rating/35star.gif"
115 ElseIf (Stars >= 4.0) And (Stars < 4.5) Then
116 Me.Rating.ImageUrl = "./images/rating/4star.gif"
117 ElseIf (Stars >= 4.5) And (Stars < 5.0) Then
118 Me.Rating.ImageUrl = "./images/rating/45star.gif"
119 ElseIf (Stars >= 4.5) And (Stars <= 5.0) Then
120 Me.Rating.ImageUrl = "./images/rating/5star.gif"
121 End If
122 dtrMyDataReader.Close()
123 conMyConnection.Close()
124 End Sub
 
If you want to reduplicate the error, click over here and try to submit a rating:
http://www.link-exchangers.com/view_full_article.aspx?aid=51
Thanks for helping me figure this out.

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Jul 12, 2007

Hi there,



I am using SQL Reporting Services to generate reports. I am calling the stored procedure from the reporting services. The procedure has parameters which take null. I am stuck with passing null to the parameter from the reporting services. I shows the error and the report is not generated. Could you please suggest the way to pass null to the stored procedure parameter from the SQL Reporting Services.



Kindly reply me with the possible solution ASAP.



Thanks in advance





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How To Pass Null Value To The Database If A Form Field Is Empty?

May 31, 2004

How can I pass into the database (@User_fax = null) if the fax form field is empty, from a command type Stored Procedure? For example:

Dim CmdUpdate As New SqlCommand("Form2_NewUser", strConnection)
CmdUpdate.CommandType = CommandType.StoredProcedure

CmdUpdate.Parameters.Add("@User_fax", SqlDbType.char, 9)
CmdUpdate.Parameters("@User_fax").Value = fax.Text()

...

strConnection.open()
CmdUpdate.ExecuteNonQuery
strConnection.close()



And, the stored procedure inside Sql server:

USE market1
GO
ALTER PROC Form2_NewUser
@User_id bigint, @User_fax char(9),...

AS

SET NOCOUNT ON
UPDATE Users
SET User_fax = @User_fax, ...

WHERE User_id = @User_id
SET NOCOUNT OFF
GO



Thank you,
Cesar

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