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This message was discovered on ASPFriends.com 'aspngdata' list.


eoghan
-- Moved from [aspngfreeforall] to [aspngdata] by Tim Musschoot <Click here to reveal e-mail address> --

hi
how do i get the number of records returned by
a query in asp and ouput the result: eg.
query returned 50 records ?
thanks - eoghan
Reply to this message...
 
    
Brian W. Spolarich
The problem is that SQLDataReader only provides forward-only access, so there's not an easy way to count the result set before using it.

I found the following article that provides a good solution to this.

<http://www.bipinjoshi.com/displayarticle.aspx?id=105> http://www.bipinjoshi.com/displayarticle.aspx?id=105

Introduction

DataReader allows forwardonly and readonly data access. Many times we need to know the number of records returned after firing a SELECT query. DataReader do not offer this functionality. We can, however, use some trick to quickly and efficiently get this data. This How To is intended to show you just that.

Executing Batch Queries

The Command object can be used to fire batch of queries instead of single query. In this case we can execute action as well as select queries together. We can then call ExecuteReader method of the Command object. There can be multiple result sets obtained and those can be navigated using NextResult method of DataReader. Following code snippet shows how it works:
Dim cnn As New SqlConnection(Global.GetConnectionString)

Dim cmd As New SqlCommand()

Dim dr As SqlDataReader

cnn.Open()

cmd.CommandText = "select count(*) from employees;

select * from employees"

cmd.Connection = cnn

dr = cmd.ExecuteReader

dr.Read()

Label1.Text = dr.GetValue(0)

dr.NextResult()

DataGrid1.DataSource = dr

DataGrid1.DataBind()
Here, we have first declared objects of connection, command and DataReader. Note how the CommandText property of the command object is set to two SELECT queries separated by a ";". Next, the Command is executed and the output is assigned to DataReader. The DataReader contains two result sets matching our queries. First query gives us the number of records. The NextResult method shifts to the next result set and we can bind the actual data with the DataGrid.

-bws

| -----Original Message-----
| From: eoghan [ mailto:Click here to reveal e-mail address]
| Sent: Thursday, July 11, 2002 7:42 AM
| To: aspngdata
| Subject: [aspngdata] records
|
|
| -- Moved from [aspngfreeforall] to [aspngdata] by Tim
| Musschoot <Click here to reveal e-mail address> --
|
| hi
| how do i get the number of records returned by
| a query in asp and ouput the result: eg.
| query returned 50 records ?
| thanks - eoghan
| | [aspngdata] member Click here to reveal e-mail address = YOUR ID
| | http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| | http://www.asplists.com/search = SEARCH Archives
|
|
Reply to this message...
 
    
Collins, Mike
Well, I don't know about regular asp, but if you really meant asp.net, this
is how I did it.

First I put the returned recordset in to a dataset:
Dim myDataset As New DataSet
Dim recordCount AS Integer

objDataAdapter.Fill(myDataset, "tableName")
recordCount = myDataset.Tables("currDot Net Guruers").Rows.Count.ToString()

tableName above is just a name you give the dataset table. Not a table name
from the database.

Then just assign the record count to a control:

lblRowCount.text = recordCount

-----Original Message-----
From: eoghan [mailto:Click here to reveal e-mail address]
Sent: Thursday, July 11, 2002 7:42 AM
To: aspngdata
Subject: [aspngdata] records

-- Moved from [aspngfreeforall] to [aspngdata] by Tim Musschoot
<Click here to reveal e-mail address> --

hi
how do i get the number of records returned by
a query in asp and ouput the result: eg.
query returned 50 records ?
thanks - eoghan
| [aspngdata] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngdata.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

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System.Data.DataSet
System.Data.SqlClient.SqlCommand
System.Data.SqlClient.SqlConnection
System.Data.SqlClient.SqlDataReader
System.Web.UI.WebControls.DataGrid
System.Windows.Forms.DataGrid




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