how can write select query for retrieve row count using parameterized query in vb.net

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4.50/5 (2 votes)

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i am using visual studio 2010 and sql server 2008..
My problem is that how can i write the following queries using parameterized query

VB

Call openconnection()
       Dim temp As String
       temp = "pending for client approval"
       Dim a As Integer
       str = "select Count(*) a from Mastertable where CaseStatus='" & temp & "'  "
       cmd = New SqlCommand(str, cn)
       dr = cmd.ExecuteReader
       If dr.Read Then
           tb_countNumber.Text = dr.Item(a).ToString
       End If
       cn.Close()

Can i write this code using parameterized query and for that what changes should i have to do..?
Thankx in advance..

Posted 18-Sep-12 0:23am

neldesai

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2 solutions

Solution 1

ExecuteScalar will do...

VB

tb_countNumber.Text = Convert.ToString(cmd.ExecuteScalar())

Posted 18-Sep-12 0:36am

Kuthuparakkal

Comments

Kuthuparakkal 18-Sep-12 10:41am

why downvote, plz add some comments!

Kschuler 18-Sep-12 12:28pm

Oops...I mean to give that a 3 stars not 2. I fixed. And it was just because the question was how to do parameters. I agree that the execute scalar is a lot easier to use than the reader.

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Kschuler · Accepted Answer · 2012-09-18T04:49:00

This is a very common question, and the answer can easily be found on google.[^]

Basically it will look something like this:

VB

str = "select Count(*) a from Mastertable where CaseStatus=@parmCaseStatus"
cmd = New SqlCommand(str, cn)
cmd.Parameters.Add(New SqlParamater("@parmCaseStatus", temp))

Then, instead of a reader you can use the cmd.ExecuteScalar like Kuthuparakkal suggested in the other solution. like this

VB

Dim strResult as String = cmd.ExecuteScalar()