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This walkthrough supposes that you know how to connect to server, how to create the necessary objects on the server, and how to insert the data to the created tables. NET serve as a bridge between an application and a data source, and allow you to execute commands as well as to retrieve data by using a Data Reader or a Data Adapter. Print Dept(conn) ' updating records in Dept Module1.

Note that if you do not use design-time (specifically, if you do not place on a designer Oracle Connection component from toolbox), you have to embed license information manually. As we know, an original function of any database application is establishing a connection to a data source and working with data contained in it. Updating data involves using the Command and Data Adapter objects; and it may also involve using transactions. New Line) ' Always call Read before accesing data While reader. Modify Dept(conn) ' printing out the Dept table to console Module1. Read Line() End Try End Using End Sub End Module A traditional way for working with Data Table and Data Set assumes consecutive creating and initializing Connection, Command, Data Adapter, and Command Builder objects.

Scalability is related to performance, but it can't be identified exclusively with that.

Net is designed to operate as a "disconnected recordset" (using the older ADO terminology). Net does not hold a connection to the database and does not automatically send updates back to the database.

NET, don't interoperate with datasource immediately. These classes provide the ability to work off-line against your data storage: Data Set, Data Table, Data Column, Data Row, Constraints, Data Relation, Data View, and Data Row View. Public Sub Use Data Table() Dim my Data Table As Oracle Data Table _ As New Oracle Data Table("SELECT * FROM Dept", "User Id=Scott; Password=tiger; Data Source=Ora;") Try ' Fetch All=true means to retrieve data from server entirely when Data Table is opened.

The objects, which represent the disconnected model of ADO. ' Or put the reader in the using block to call Close implicitly. Execute Reader() ' printing the column names For i As Integer = 0 To reader. Here is a small sample that demonstrates usage of Oracle Data Table.

When changes are made to the dataset, the changes in the database are actually done by the data adapter. It is a disconnected, cached set of records that are retrieved from a database. Text = "tutorialspoint.com" End Sub Private Sub Button1_Click(sender As Object, e As Event Args) Handles Button1.

When a connection is established with the database, the data adapter creates a dataset and stores data in it. Click Dim connection As Sql Connection = New sqlconnection() connection.

Let's make some classification to get better understanding of ADO. There are two approaches to work with data: connected and disconnected models. Read() ' printing the table content For i As Integer = 0 To reader. Print Dept(conn) Catch ex As Oracle Exception Console. Devart Oracle Data Table and Oracle Data Set have advanced features that make work with data easier.

You can use classes of the connected model for establishing connection and setting transactions, for fetching data and updating datasources. Even more, with our components you can retrieve and manipulate data in design time.




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