Working with Database in ASP ADO Object Model Database Connection Record Set Query Examples Update & Insertion Examples An Application Example

ADO is a Microsoft technology ADO stands for ActiveX Data Objects ADO Object Model ADO is a Microsoft technology ADO stands for ActiveX Data Objects ADO is a Microsoft Active-X component ADO is automatically installed with Microsoft IIS ADO is a programming interface to access data in a database ADO can be accessed from within your Active Server Pages

Relationships Among the Objects

Accessing a Database from an ASP Page The normal way to access a database from inside an ASP page is to: Create an ADO connection to a database Open the database connection Create an ADO recordset Open the recordset Extract the data you need from the recordset Close the recordset Close the connection

Database Connection The easiest way to connect to a database is to use a DSN-less connection. A DSN-less connection can be used against any Microsoft SQL database on your web site. If you have a database called "northwind " located in your SQL Server, you can connect to the database with the following ASP code:

Database Connection, cont. Create a file called “ADOConnection.asp” and type in the code below <% dim connobj dim connstr connstr = "Provider=SQLOLEDB;Data Source=MyServer;Database=Northwind;User Id=NorthUser;Password=abc;" set connobj = Server.CreateObject("ADODB.Connection") connobj.Open (connstr) connobj.Close set connobj = nothing %> 2. The ADO Connection object is used to create an open connection to a data source. Through this connection, you can access and manipulate a database.

Create an ADO Table Recordset 1.Create the file “ADORecordset.asp” and type in the code below <% dim connobj dim connstr dim recobj connstr = "Provider=SQLOLEDB;Data Source=MYSERVER;Database=Northwind;User Id=NorthUser;Password=abc;" set connobj = Server.CreateObject("ADODB.Connection") connobj.Open (connstr)'this part create and assign the recordset. set recobj = Server.CreateObject("ADODB.Recordset") 'open the table customer using connobj as the default connection. recobj.Open "Customers", connobj Response.Write("Table Customers opened.") connobj.Close recobj.close set recobj = nothing set connobj = nothing %>

Extract Data from the Recordset Create a file called “ADORecordset2.asp” and type in the code below: <% dim connobj dim connstr dim recobj connstr = "Provider=SQLOLEDB;Data Source=MYSERVER;Database=Northwind;User Id=NorthUser;Password=abc;" set connobj = Server.CreateObject("ADODB.Connection") connobj.Open (connstr) 'this part create and assign the recordset. set recobj = Server.CreateObject("ADODB.Recordset") 'open the table customer using connobj as the default connection. recobj.Open "Customers", connobj Response.Write("Table Customers opened.<br />") 'retrieve data

Extract Data from the Recordset, cont. for each x in recobj.fields response.write(x.name) response.write(" = ") response.write(x.value & "<br />") next connobj.Close recobj.Close set recobj = nothing set connobj = nothing %>

Closing Recordset and closing Connection 1.After using the recordset and connection object, it is important to properly close and destroy the objects. 2.Below is the 4 lines necessary to perform such operations. Recobj.close Connobj.close Set recobj = nothing Set connobj = nothing

Database Connection Examples ODBC source connection example: Set myDBConnection = Server.CreateObject( "ADODB.Connection" ) ConnStr = “DSN=airline db; uid=cis8490; pwd=test” myDBConnection.open connStr OLE connection example Set myDBConnection = Server.CreateObject( "ADODB.Connection " ) myDBConnection.Open “PROVAIDER=SQLOLEDB; DATA SOURCE = yourserver; UID=sa; PWD=secret; DATABASE=Pubs ” ODBC Driver For Trusted Connection security connection example myDBConnection.Open "Driver={SQL Server};" & _           "Server=MyServerName;" & _           "Database=myDatabaseName;" & _           "Uid=;" & "Pwd=;"

A Recordset object: the entire set of records Opened from a base table Recordset Objects A Recordset object: the entire set of records Opened from a base table Created by the results of an executed query Record object: an record in the recordset Current record Only a single record can be referenced at any time Field object: an attribute (field) in a record Can be referenced by the attribute name or by its position (index)