Lecture 6 VB.Net SQL Server

Contents SQL Vs. SQL Server SQL Server Vs. SQL Server Management Studio Copy Database from one drive to another Drive Connection Steps ADO.net Connection Command Data Adapter Data Set Data Binding to Gridview

SQL vs. SQL Server SQL (Structured Query Language) SQL Server Standard language designed to organize, manage, and retrieve data from a database. Programming language for relational databases SQL Server SQL Server is Microsoft's relational database management system (RDBMS). Handle 1000’s of users. Competitors: Oracle Database (DB) and MySQL. 

SQL Server & SQL Server Management Studio There are two steps for installation: SQL Server 2005 Relational Database Management System .exe extension (Execution File) SQL Server Management Studio Used for configuring, managing, and administering all components within Microsoft SQL Server. .msi extension (Microsoft Installer or Windows Installer) Similar to .exe but One .msi file installation can occur at a time

Copy Database from one drive to another Drive (Detach and Attach) Step 01: Open Microsoft SQL Server 2005 Right Click particular database to be copied (my_database)  Tasks  Detach (Remove) Click Ok on opened Dialog Box Step 02: Copy Database (Default Location: C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data)  Paste on target path. Step 03: Right click on main option of Databases  Attach  Click on Add Button in Open Dialog Box  Now select the location of relocated database (my_database)  Ok

ADO.net (ActiveX Data Object for .NET) Manages communication between your application and data source, through its classes and methods. The connection to the database is disconnected. Database is connected when any changes made to the copy of the database. ADO.net classes are contained in the 'System.Date' namespace. Following are some of the important classes used in ADO.net. Connection Command DataAdapter DataReader DataSet ActiveX: Microsoft-created technology enables different software applications to share information and functionality. 

ADO.net (Connection) The connection string contains the information that the provider need to know to be able to establish a connection to the database or the data file. The ADO.NET Connection class is used to establish a connection to the database. The Connection class uses a Connection String to identify the database server location, authentication parameters, and other information to connect to the database. SqlConnection class is used for MS-SQL server database.  OleDBConnection (Object Link Embedding & Database) is used for databases like Oracle and MS-Access.

System.Data and System.Data.SqlClient Imports System.Data It is a namespace which provides access to classes of ADO.NET architecture. Imports System.Data.SqlClient Can only be used for connecting to SQL Server 2000 and later.

ADO.net (Connection) Connection String example Connection String parts Dim connectionString As String = “ Data Source=.\SqlExpress;Initial Catalog=my_database;Integrated Security=True" Connection String parts .\SqlExpress  Database Server Name Initial Catalog  Database Name Integrated Security  Authentication Note: User Name and Password are optional Creating new instance for connection string Dim connection As New SqlConnection(connectionString)

ADO.net (Command) This class is used to provide the command to be executed on an database. The sql commands include select, update, insert and delete queries. Example: Dim sql As String = "SELECT * FROM Table_1“ Three major method used by this classes are:  ExecuteNonQuery execute commands that don’t return values. ExecuteScalar executes commands that returns a single value. ExecuteReader executes commands that returns a result set.

ADO.net (Data Adapter) This class acts as bridge between the databases and the copy of the database in the memory. Fill method is used to populate the datatset or datatable with data from the database. Update method is used to update the database after the dataset is manipulated. Example: Dim ds As New DataSet() connection.Open() dataadapter.Fill(ds, "Table_1") connection.Close()

ADO.net (Data Set) This class stores the copy of the database retrieved from the original Database. Example: Dim ds As New DataSet()

Connecting Gridview with database Set dataset with Data source of Gridview. DataGridView1.DataSource = ds Connect particular table with Gridview. DataGridView1.DataMember = "Table_1"

Connecting Gridview with database Dim connectionString As String = "Data Source=.\SqlExpress;Initial Catalog=my_database;Integrated Security=True" Dim connection As New SqlConnection(connectionString) Dim sql As String = "SELECT * FROM Table_1" Dim dataadapter As New SqlDataAdapter(sql, connection) Dim ds As New DataSet() connection.Open() dataadapter.Fill(ds, "Table_1") connection.Close() DataGridView1.DataSource = ds DataGridView1.DataMember = "Table_1"