ADO.NET Overview. Connected Architecture. SqlConnection, SqlCommand, DataReader class. Disconnected Architecture

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EEE-474 DATABASE PROGRAMMİNG FOR İNTERNET

1 Topics Data is Everywhere ADO.NET Overview Connected Architecture EEE-474 DATABASE PROGRAMMİNG FOR İNTERNET INTRODUCTION TO ADO.NET Mustafa Öztoprak ASSOC.PROF.DR. TURGAY İBRİKÇİ ÇUKUROVA UNİVERSTY ELECTRİCAL AND ELECTRONİCS ENGİNEERİNG SqlConnection, SqlCommand, DataReader class Disconnected Architecture SqlDataAdapter,Datatable,Dataset class 3-Tier Architecture Earlier the information was managed in files which were very difficult and time consuming process Data Security again a crucial thing With introduction of database system; information was computerized 1

2 ADO.NET comes in the picture Database: Collections of Tables. Tables: Collections of records in the form rows and cols IMPORTANCE OF DATABASES IN DIFFERENT SECTOR INTERNET RETAIL SALES 2

E-MARKETING ADO.NET Overview ADO.NET Overview Ado.

The source is database but it could also be a text file,spreadsheet or xml

net objects encapsulate all data operations and controls interactions with

ADO.NET Understanding ADO.net ADO.NET The Ado.net ObjectModel ADO.

net Framework,providing access to relational,xml, and application data. ADO.

3 E-MARKETING ADO.NET Overview ADO.NET Overview Ado.net is a set of libraries that allows interaction with data sources. The source is database but it could also be a text file,spreadsheet or xml file. Ado.net objects encapsulate all data operations and controls interactions with these objects to display data thus hiding the details of movement of data ADO.NET Understanding ADO.net ADO.NET The Ado.net ObjectModel ADO.NET Overview ADO.NET It is an integral part of the.net Framework,providing access to relational,xml, and application data. ADO.NET Overview ADO.NET ADO.NET supports a variety of development including needs, the creation of front-end database clients and middle-tier business objects used by applications, tools, languages, or Internet browsers. 3

ADO.NET Overview Introduction to ADO.NET : Data Providers ADO.NET and.

Provider Oracle For Oracle Databases It is similar to the internet connection which allows communication

NET connects application and data SQL Data Provider Sql For interacting with Microsoft SQL Server Borland

4 ADO.NET Overview Introduction to ADO.NET : Data Providers ADO.NET and.net Base Namespaces ProviderName APIprefix Data SourceDescription ODBC Data Provider Odbc Data Sources with an ODBC interface. Normally older data bases OleDb Data Provider OleDb Data Sources that expose an OleDb interface, i.e. Access or Excel Oracle Data Provider Oracle For Oracle Databases It is similar to the internet connection which allows communication between two different ends. Like a bridge which connects the two ends, ADO.NET connects application and data SQL Data Provider Sql For interacting with Microsoft SQL Server Borland Data Provider Bdp Generic access to many databases such as Interbase, SQL Server, IBM DB2, and Oracle ADO.NET IN NET FRAMEWORK As data processing increasingly uses multitier architectures,program mers are switching to a disconnected approach to provide better scalability for their applications ADO.NET Components The two main components of ADO.NET for accessing and manipulating data;these are: 1).NET Framework data providers and 2) The DataSet. 4

manipulation and fast, forward-only, read-only access to data. 1).

1).NET Framework data providers (b) The Command object enables access to database commands to

NET Framework data providers (c) The DataReader provides a highperformance stream of data from

NET Framework data providers (d) The DataAdapter provides the bridge between the DataSet object

5 1).NET Framework data providers The.NET Framework Data Providers are components that have been explicitly designed for data manipulation and fast, forward-only, read-only access to data. 1).NET Framework data providers (a) The Connection object provides connectivity to a data source. 1).NET Framework data providers (b) The Command object enables access to database commands to return data, modify data, run stored procedures, and send or retrieve parameter information. 1).NET Framework data providers (c) The DataReader provides a highperformance stream of data from the data source. 1).NET Framework data providers (d) The DataAdapter provides the bridge between the DataSet object and the data source. 2) The DataSet The ADO.NET DataSet is explicitly designed for data access independent of any data source. As a result, it can be used with multiple and differing data sources, used with XML data, or used to manage data local to the application. 5

Connected Architecture The architecture of ADO.

called as connected architecture Built on the classes connection, command, datareader and

doing smaller transactions Connected Data Access Model SqlConnection Class SqlConnection

Server database. This class cannot be inherited.

when connecting to a Microsoft SQL Server database.

the means of communication in between them.

6 Connected Architecture The architecture of ADO.net, in which connection must be opened to access the data retrieved from database is called as connected architecture Built on the classes connection, command, datareader and transaction This creates more traffic to the database but is normally much faster for doing smaller transactions Connected Data Access Model SqlConnection Class SqlConnection Class SqlConnection Class SqlConnection class It represents an open connection to a SQL Server database. This class cannot be inherited. SqlConnection is used together with SqlDataAdapter and SqlCommand to increase performance when connecting to a Microsoft SQL Server database. SqlConnection object act as a mediator between data source and application which provides the means of communication in between them. SqlConnection class if we want to share or retrieve information from web we need to have connection with internet. Similarly if we want to send or retrieve information from database we need to connect our application with database.. Connection between two ends SqlConnection object act as a switch can be made by telephone also between data source and application which provides connects the application like the SqlConnection object. and data server. 6

SqlConnection Class - SqlCommand Class SqlCommand class It represents a

database. This class cannot be inherited.

properties are set to their initial values.

gives command to execute the queries in Sql Server.

As the command prompt accepts and executes the given command, similarly

provides a way of reading a forward-only stream of rows from a SQL Server To

SqlCommand object, instead of directly using a constructor.

7 SqlConnection Class - SqlCommand Class SqlCommand class It represents a Transact- SQL statement or stored procedure to execute against a SQL Server database. This class cannot be inherited. SqlCommand Class When an instance of SqlCommand is created, the read/write properties are set to their initial values. As a teacher who gives command to the students, similarly SqlCommand object gives command to execute the queries in Sql Server. Robot follows every given command like the sqlcommand object. As the command prompt accepts and executes the given command, similarly SqlCommand object gives command to execute the queries in Sql Server. SqlCommand Class SqlDataReader Class SqlDataReader class It provides a way of reading a forward-only stream of rows from a SQL Server database. This class cannot be inherited. To create a SqlDataReader, user must call the ExecuteReader method of the SqlCommand object, instead of directly using a constructor. As a reader reads the book, similarly SqlDataReader object reads data stored in tables of Sql Server. SqlDataReader Class Like a cd drive which reads the data stored in the cd. As a card reader reads the data stored in the card, similarly SqlDataReader object reads data stored in tables of Sql Server. 7

8 SqlDataReader Class - SqlDataReader Class- Using Connected Architecture Connected Data Access Model Connected Data Access Model Connected Data Access Model 8

Disconnected Architecture The result set retrieved is kept in memory and the connection to the DB is no longer needed for

Method of retrieving a record set from the database and storing it giving the ability to do many Create, Read, Update and

Data Access Model SqlDataAdapter DataTable DataSet class SqlDataAdapter class SqlDataAdapter class SqlDataAdapter Class It

object to communicate application with Sql Server.

9 Disconnected Architecture The result set retrieved is kept in memory and the connection to the DB is no longer needed for traversal. Method of retrieving a record set from the database and storing it giving the ability to do many Create, Read, Update and Delete) operations on the data in memory, then it can be re- synchronized with the database when reconnecting Disconnected Data Access Model SqlDataAdapter DataTable DataSet class SqlDataAdapter class SqlDataAdapter class SqlDataAdapter Class It represents a set of data commands and a database connection that are used to fill the DataSet and update a SQL Server database. This class cannot be inherited. As a adapter connects the device and the power connection, similarly SqlDataAdapter object uses connection and dataset object to communicate application with Sql Server. SqlDataAdapter Class The SqlDataAdapter, serves as a bridge between a DataSet and SQL Server for retrieving and saving data. SqlDataAdapter is used in conjunction with SqlConnection and SqlCommand objects. As a router takes care of connection and data to be traveled, similarly SqlDataAdapter object uses connection and dataset object to communicate application with Sql Server. DATA ADAPTER ARCHITECTURE 9

DataSet Class DataSet Class DataSet Class Datasets are containers in

The DataSet consists of a collection of DataTable objects Dataset acts

Database. Like a suitcase which stores luggage temporary while travelling.

reflect in original data until its saved, similarly dataset contains a

DATASET ARCHITECTURE Using Disconnected Architecture DİSCONNECTED MODEL

Form { public Form1() { InitializeComponent(); } SqlConnection Con = new

10 DataSet Class DataSet Class DataSet Class Datasets are containers in which you can store data to use in your application. The DataSet consists of a collection of DataTable objects Dataset acts like a storage in which data is kept after taken from the Sql Server Database. Like a suitcase which stores luggage temporary while travelling. Just like in RAM data is stored temporarily and modification doesn't reflect in original data until its saved, similarly dataset contains a copy of data which can be modified and database get updated when saved. DATASET ARCHITECTURE Using Disconnected Architecture DİSCONNECTED MODEL EXAMPLE using System; using System.Data; using System.Data.SqlClient; using System.Windows.Forms; namespace WindowsFormsApplication26 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } SqlConnection Con = new SqlConnection("server=localhost;Database=student; user=sa;pwd=1234;"); private void Form1_Load(object sender, EventArgs e) { List(); DİSCONNECTED MODEL EXAMPLE } 10

DİSCONNECTED MODEL EXAMPLE DİSCONNECTED MODEL EXAMPLE 3 - Tier Architecture 3-Tier Architecture

: a=20; b=10; Store c; Presentation Layer also called User Interface. Computer, Mobile phone,etc. BLL C#.

g.: Ms Sqlserver Data Logic Layer Often has best performance Initially the fastest to write Inflexible

decisions to implementer Ties presentation layer to returned data format 3-Tier Architecture Business

to returned data format More complex to design and build Implicit changes may need to be cascaded

11 DİSCONNECTED MODEL EXAMPLE DİSCONNECTED MODEL EXAMPLE 3 - Tier Architecture 3-Tier Architecture Graphical representation of 3-Tier Architecture UI Asp.net MVC E.g.: a=20; b=10; Store c; Presentation Layer also called User Interface. Computer, Mobile phone,etc. BLL C#.net E.g.: c=a+b; Business Logic Layer Does all the logic operations DAL ADO.NET E.g.: Output c; Data Access Layer Communicate with the database Database E.g.: Ms Sqlserver Data Logic Layer Often has best performance Initially the fastest to write Inflexible to change Business logic not available Results in code duplication Error prone Leaves architecture decisions to implementer Ties presentation layer to returned data format 3-Tier Architecture Business Logic Layer Much more flexible to change Business logic is centralized Does not tie presentation layer to returned data format More complex to design and build Implicit changes may need to be cascaded through all layers Does not clearly address remoting issues Business Logic must still be aware of database classes 11

3-Tier Architecture References Presentation Layer Most flexible to change Most scalable (but decreased performance) Clearly provides remoting capabilities Business Logic does not need to be aware of

12 3-Tier Architecture References Presentation Layer Most flexible to change Most scalable (but decreased performance) Clearly provides remoting capabilities Business Logic does not need to be aware of database classes Most complex to design and build Implicit changes may need to be cascaded through all layers Presentation Layer QUESTİONS? 12

ADO.NET.NET Data Access and Manipulation Mechanism. Nikita Gandotra Assistant Professor, Department of Computer Science & IT

ADO.NET.NET Data Access and Manipulation Mechanism Nikita Gandotra Assistant Professor, Department of Computer Science & IT Overview What is ADO.NET? ADO VS ADO.NET ADO.NET Architecture ADO.NET Core Objects