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How to access SQL Server in Active Server Pages

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Summary

This article describes how to establish connections to SQL Server in an ASP script by using ActiveX Data Objects (ADO), while taking advantage of the connection pooling feature of ODBC 3.0.



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More Information

Connection Pooling

Enable ODBC connection pooling.
For additional information about connection pooling and for instructions about how to enable this feature, click the following article number to view the article in the Microsoft Knowledge Base:

164221 How to enable connection pooling in an ODBC application

ODBC DSN

Using the ODBC Administrator, create a System data source name (DSN) on the computer where Microsoft Internet Information Server (IIS) is installed. Specify the connection attribute one time, and then reuse it on every page. For example, in the Session_OnStart event in Global.asa file, define the connection attribute as:
   Session("ConnectionString") =
   "dsn=SQLSysDSN;uid=<username>;pwd=<strong password>;DATABASE=pubs;APP=ASP Script"
Make sure that all the following conditions are true:
  • The Trusted Connection box is not selected in the System DSN definition.
  • The SQL Server security mode is not Windows NT Integrated.
  • In the connection attribute, the uid is not blank.
Otherwise, a connection to SQL Server might fail, and you receive the following error message:

Microsoft OLE DB provider for ODBC Drivers error '80004005'
[Microsoft][ODBC SQL Server Driver][SQL Server]Login failed- User: _
Reason: Not defined as a valid user of a trusted SQL Server connection.

Global.asa

Use of the Global.asa file is optional. In its place, entries typically made in this file can be put on the first page called by the application. Assuming the ASP scripts are located in a folder that is not defined as a virtual directory in the Internet Service Manager, but below another virtual directory, the Global.asa file containing Session variables and DSN definitions must be kept in the virtual directory. Otherwise, you receive the following error message:

Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC Driver Manager] Data source name not found and no
default driver specified

Connections in the ASP Script

Take advantage of connection pooling by opening and closing the connection to the database on every active server page. To open the connection, type the following statements in the <Body> section of the page: 
   <%
   Set OBJdbConnection = Server.CreateObject("ADODB.Connection")
   OBJdbConnection.Open Session("ConnectionString")   %>
To close the connection, put the following immediately after the </Body> tag: 
   <%
   OBJdbConnection.Close
   Set OBJdbConnection = Nothing
   %>
You may receive the following two error messages if the connection settings are not correctly defined as outlined earlier in this article:


Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC SQL Server Driver][DBNMPNTW]Connection broken.
-or-

Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC SQL Server Driver]Communication link failure

Here is a sample application that consists of the Global.asa and the Authors.asp files. This sample application will return four columns and all the records in the pubs table named authors.

Note You must change UID <username> and pwd =<strong password> to the correct values before you run this code. Make sure that UID has the appropriate permissions to perform this operation on the database.

Global.asa
   <SCRIPT LANGUAGE=VBScript RUNAT=Server>
   Sub Session_OnStart
   Session("ConnectionString") =
   "DSN=SQLSysDSN;UID=<username>;PWD=<strong password>;DATABASE=pubs;APP=ASP script"
      Session("ConnectionTimeout") = 15
      Session("CommandTimeout") = 30
   End Sub

   Sub Session_OnEnd

   End Sub
   </SCRIPT>
Authors.asp
   <HTML>
   <HEAD>
   <TITLE>All Authors</TITLE>
   </HEAD>
   <BODY BGCOLOR="#FFFFFF">

   <% Set OBJdbConnection = Server.CreateObject("ADODB.Connection")
   OBJdbConnection.ConnectionTimeout = Session("ConnectionTimeout")
   OBJdbConnection.CommandTimeout = Session("CommandTimeout")
   OBJdbConnection.Open Session("ConnectionString")
   Set SQLStmt = Server.CreateObject("ADODB.Command")
   Set RS = Server.CreateObject ("ADODB.Recordset")
   %>

   <p>
   <table border="0" bordercolor="#000000">
   <%
   SQLStmt.CommandText = "select * from authors"
   SQLStmt.CommandType = 1
   Set SQLStmt.ActiveConnection = OBJdbConnection
   RS.Open SQLStmt

   Do While Not RS.EOF
   %>
   <TR>
      <TD Width = 150 ALIGN=LEFT>
         <FONT SIZE=+1>
         <%= RS("au_id") %>
         </FONT></TD>
      <TD></TD>
         <TD Width = 150 ALIGN=LEFT>
         <FONT SIZE=+1>
         <%= RS("au_lname")  %>
         </FONT></TD>
      <TD Width = 150 ALIGN=LEFT>
         <FONT SIZE=+1>
         <%= RS("au_fname")  %>
         </FONT></TD>
      <TD Width = 150 ALIGN=LEFT>
         <FONT SIZE=+1>
         <%= RS("phone")  %>
         </FONT></TD>
   </TR>
   <%
   RS.MoveNext
   Loop
   %>
   </table>
   <hr>
   <p>
   </BODY>
   <% OBJdbConnection.Close
   Set OBJdbConnection = Nothing
   %>
   </HTML>
For more information about Active Server Pages, see the Roadmap provided by the ASP setup program on the IIS server.

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Keywords: kbtshoot, kbinterop, kbhowto, kbenv, kbyukonsweep, kbappliestoyukon, kb, kbsqlsetup, kbdsupport

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Article Info
Article ID : 169377
Revision : 3
Created on : 4/18/2018
Published on : 4/19/2018
Exists online : False
Views : 756