This document provides an introduction to using ActiveX Data Objects (ADO) in ASP to access and process data from various database sources. It discusses ADO objects like Connection and Recordset that are used to connect to databases and retrieve data. It also covers making database connections through connection strings, executing SQL commands and stored procedures, and retrieving and updating data using a Recordset object. Examples are given for connecting to Access and SQL Server databases using both ODBC and OLE DB providers.

1. Introduction to ASPIntroduction to ASP
(Day 2)(Day 2)
JoniJoni
ATL - Bina NusantaraATL - Bina Nusantara

2. Agenda
• Database Processing using ADO in ASP

3. ADO - ActiveX Data Object
• A high-level data access API to access any data
source
• Relational database: Access, MSSQL, Oracle and any
ODBC compliant database
• Non-relational: e.g. Microsoft Index Server, Active
Directory Service
• Dual-interface COM interface
• Can be used in any scripting language (e.g. VBScript
in ASP) and compiled language (e.g. in Delphi).

4. ADO - ActiveX Data Object
• A high-level data access API to access any data
source
• Relational database: Access, MSSQL, Oracle and any
ODBC compliant database
• Non-relational: e.g. Microsoft Index Server, Active
Directory Service
• Dual-interface COM interface
• Can be used in any scripting language (e.g. VBScript
in ASP) and compiled language (e.g. in Delphi).

5. A Generic API...
• ADO provides a generic API for data
access. But the underlying data source
may not support some properties /
methods.
• Check the documentation of ADO and
the data provider.

6. Important ADO Objects
• Connection
• RecordSet
• Command
• How to report error

7. Making Connection
Dim conn
Dim ConnectionString
ConnectionString = "DSN=Pubs;UID=sa;PWD=pwd;"
Set conn =
Server.CreateObject(“ADODB.Connection”)
conn.Open ConnectionString
‘Now you can use conn to issue SQL command
‘...
conn.Close
Set conn = Nothing

8. Connection String (ODBC)
"DSN=Pubs;UID=sa;PWD=pwd;”"DSN=Pubs;UID=sa;PWD=pwd;”
“PROVIDER=MSDASQL; DRIVER={Microsoft Access
Driver (*.mdb)};DBQ=C:NWind.mdb; UID=admin;
PWD=;”
“PROVIDER=MSDASQL; DRIVER={Microsoft Access
Driver (*.mdb)};DBQ=C:NWind.mdb; UID=admin;
PWD=;”
“driver={SQL Server};server=srv;
uid=sa;pwd=pwd;database=pubs”
“driver={SQL Server};server=srv;
uid=sa;pwd=pwd;database=pubs”
Using DSN
DSNless, to MS SQL server
DSNless, to Access MDB
DSNless connection
is a bit faster
DSNless connection
is a bit faster

9. Connection String (OLE DB)
“Provider=Microsoft.Jet.OLEDB.3.51; Data
Source=c:inetpubwwwrootusers.mdb”
“Provider=SQLOLEDB; Data Source=myMachine;
Initial Catalog=pubs; User ID=sa;
Password=pwd”
OLE DB, to MS SQL server
OLE DB, to Access MDB
Direct OLE DB connection is faster than
ODBC connection in both connection
establishment and record retrieval.
Direct OLE DB connection is faster than
ODBC connection in both connection
establishment and record retrieval.

10. Executing SQL
You’ll need to use ADODB.Command ...
•If your update statement is executed many
times, you should consider using prepared
command for efficiency.
•If you call stored procedure with parameters,
use ADODB.Parameter with ADODB.Command
•If your update statement has BLOB objects, use
Property.AddChunk
You’ll need to use ADODB.Command ...
•If your update statement is executed many
times, you should consider using prepared
command for efficiency.
•If you call stored procedure with parameters,
use ADODB.Parameter with ADODB.Command
•If your update statement has BLOB objects, use
Property.AddChunk
‘assume conn is a live connection
strCommand = “UPDATE, INSERT or DELETE SQL”
conn.Execute strCommand, nRecordsAffected

11. Retrieving Data using RecordSet
‘assume conn is a live connection
strQuery = “select * from Employee”
Set rs =
Server.CreateObject(“ADODB.RecordSet”)
rs.Open strQuery, conn, cursorType, lockType
Do While Not rs.EOF
‘access the current record by
rs(“fieldname”)
‘or rs(fieldnum)
rs.MoveNext
Loop
rs.Close
Set rs = Nothing
cursorType and lockType
are optional. The default
values are
adOpenForwardOnly and
adLockReadOnly
cursorType and lockType
are optional. The default
values are
adOpenForwardOnly and
adLockReadOnly

12. Retrieving Data using RecordSet
‘assume conn is a live connection
conn.BeginTrans
conn.Execute strCommand1
conn.Execute strCommand2
‘...
conn.CommitTrans
‘or conn.RollbackTrans

13. Demo