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Dynamic database query generator

for the administrator. Ask user thetable, fields he wants to access.

Payal R. ChaudharyU07CO237Purvi R. Chaudhary

U07CO241SVNIT,Computer

department 1

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Topics covered

PLATFORM USED

WHAT IS ADO?

What is ODBC?

ADO, ODBC and OLE DB

What is ADODB?

Accessing a Database from an ASP Page

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PLATFORM

Operating system- Windows Xp

Back EndMicrosoft Office Access 2003 Database

Front EndASP

Access stores data in its own format based on the Access Jet DatabaseEngine

Jet is the Database Management System ( DBMS ) which underlies MicrosoftAccess

Data is stored in the form of .mdb files

(database engine or "storage engine" is the underlying software componentthat a (DBMS) uses to create, read, update and delete data from adatabase)

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ActiveX Data Objects (ADO)

ADO is Microsoft Technology

ADO stands for ActiveX Data Objects

ADO is a Microsoft ActiveX Component

ADO is automatically installed with Microsoft IIS

ADO is a programming interface to access data in a database

( without knowing how the Database is implemented )

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ADO Software Architecture

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VC++ VB Script Java

ADO

OLE DB

RDBMS E-mail Directory Services

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What is ODBC?

ODBC (Open Database Connectivity) is an API specification thatprovides a way for client programs (eg Visual Basic, Excel, Access, etc) to

access multiple database systems using SQL

ODBC-standardsoftware interface for accessing DBMS that uses SQL

The ODBC Driverresides between the ODBC Client and the DBMS

Any ODBC-compliant application can access any DBMS that has acorresponding driver.

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ADO, ODBC and OLE DB

ODBC was the MS wayof connecting to and using databases on theWindows platform

ADO is the strategic way for using ODBC data sources on the Windows

platform

OLE DB extends ODBC by using the concept of service providers to add the

ability to connect to other non-database data sources (MS Active Directory(LDAP), e-mail servers (Exchange)) that do not necessarily use SQL.

ODBC Data Sources; provider = MSDASQL

MS Index Server; provider = MSIDXS

MS Active Directory Server - provider = ADSD300Object

MS Jet databases - provider = Microsoft.Jet.OLEDB.3.51

MS SQL Server - provider = SQLOLEDB

Oracle Databases - provider = MSDAORA

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Confused !!!!....?

Lets go into little more detail

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Providers and Drivers

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ADO

JET SQL Oracle

JET SQL Oracle

ODBC

Access SQL Oracle Access SQL Oracle

OLE DB

Providers

ODBC

Drivers

Although ODBC drivers available for most popular DBMS,OLE DB is there

for limited set of popular DBMS.To provide programmers access to both

DBMS , Microsoft provided OLEDB provider for ODBC drivers Called

MSDASQL

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Cont.

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What the diagram explains?

OLE DB programming interface interacts with OLEDB data providers similarlyto the way the ODBC API interacts with ODBC drivers-both OLEDB dataprovider and ODBC drivers provide direct access to specific data stores.Although ODBC drivers available for most popular DBMS,OLE DB is there for limited set of popular DBMS.To provide programmers access to both DBMS ,MS provided OLEDBprovider for ODBC drivers.

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What is ADODB?

ADODB(ActiveX Data Objects for Database) is an abstraction library

adodb is a collection of methods to access the data from the Database

Application developed using Microsoft Visual Studio

ADODB supports-ADO,MYSQL,Oracle,MS SQL Sever,etc

- it uses SQL

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ADODB Objects

Connection RecordSet Command

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Accessing a Database from an ASP Page(Steps)

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

Steps explained in detail for clear understanding.

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STEP 1 :Creating instance of

ConnectionADODB Connection object- open up an ODBC/OLEDB

Connection to a database through database drivers so

you can do something with the database.

Server Object- ASP object used to access properties and

methods on the server

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Creating a Connection

Connection objects are created using the

CreateObject() function.

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Connection object required

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STEP 2 : Open up a database

How???!!!!!!

By using using1) a Connection String (DSN-less) or2) Data Source Name ( DSN )Usually used is Connection String

Establish a connection string and Open it Here we useDSN

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1) If ConnectionString is used

Once the ConnectionObject created ,we need to give it a

ConnectionString to logon to the datasource

ConnectionString specifies the :

provider

datasource name

userid (optional)

password (optional)

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Dim cnn

Dim str str = Provider=MSDASQL; Data Source=mydatasource;

User Id=;Password=

cnn.ConnectionString = str

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Open() and Close()

Once the connection established , the Connection must beopened before using it

Likewise it should be closed when done.

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Dim cnn

Dim str

Set cnn = CreateObject(ADODB.Connection)

str = Provider=MSDASQL.1,Data Source=mydatasource;

str = str & User ID=myuserid;Password=mypass

cnn.ConnectionString = str

cnn.Open

..cnn.Close

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2) If DSN is used . . .

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DSN-Data Source Name

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data structure that contains information about a specific database that an

ODBC driver needs in order to connect to it.(ex:- driver,directory,name as thedatabase,user ID)

A file DSN contains the relevant

information within a text file with a

.dsn file extension , and can be sharedby users of different computers who

have the same drivers installed.(unlike

system and user DSN)

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STEP 3 : CREATE AN ADO RECORDSET

Record set objects are the recipients of the result of a SQL query

create the Connection object then create a recordset object and associate

them

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Dim MyConn

Dim RS

set MyConn = CreateObject(ADODB.Connection)

set RS = CreateObject(ADODB.Recordset)

assocoate the record set with the connection

RS.ActiveConnection = MyConn

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Step 5 : Extract the data you need

from the recordset

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The record set is a collection of rows, each row containing the data

in the order that it was asked for in the SQL statement, each column

in the row can be accessed by its column name

User chooses table by simple radio botton, which gets passed to

next page stored in a variable

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Getting Data out

Displaying field names of table in checkboxesfor user to

Choose

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Displaying table with field names and values

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Code and Output (Screenshots)

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Page 1

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Page 2

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Page 3

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Page 1

Please Enter the Table to display:

Friends

Subjects

Family

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Page 2

Please Enter the fields to Display :

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Page 2

You choosed :

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Page 3

Here are my friends:

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Page 3 . . .

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!!Thank you!!

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