September 2003
Intermediate to advanced
624 pages
14h 27m
English
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1.9. Connecting to an Oracle Database
Problem
You want to connect to an Oracle database.
Solution
You can connect to an Oracle database using either the Oracle .NET data provider or the OLE DB .NET data provider.
The sample code contains two event handlers:
- Oracle
Button.Click Creates and opens a connection to an Oracle database using the Oracle .NET data provider. Information about the database is displayed from the properties of the
OracleConnectionobject.- OLE DB
Button.Click Creates and opens a connection to an Oracle database using the OLE DB .NET data provider. Information about the database is displayed from the properties of the
OleDbConnectionobject.
The C# code is shown in Example 1-7.
Example 1-7. File: ConnectOracleForm.cs
// Namespaces, variables, and constants using System; using System.Configuration; using System.Data.OleDb; using System.Data.OracleClient; // . . . private void oracleProviderButton_Click(object sender, System.EventArgs e) { // Connect to Oracle using Microsoft Oracle .NET data provider. OracleConnection conn = new OracleConnection( ConfigurationSettings.AppSettings["Oracle_Scott_ConnectString"]); resultTextBox.Text = "Connection with ORACLE Provider" + Environment.NewLine; try { conn.Open( ); resultTextBox.Text += "ConnectionState = " + conn.State + Environment.NewLine + "DataSource = " + conn.DataSource + Environment.NewLine + "ServerVersion = " + conn.ServerVersion + Environment.NewLine; } catch(OracleException ex) { resultTextBox.Text += "ERROR: " + ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.