Manipulate Products Sample - DML Operations on DataSet Through ODP.NET Using C#

Table of Contents

• Objective of the Sample Application
• Overview of the Sample Application
• User Notes with Screen Shots
• Required Software
• Extracting the Sample
• Database Setup
• Preparing and Running the sample
• Description of Sample Files

The purpose of this sample application is to demonstrate how Data Manipulation Language (DML) operations on DataSet can be done through Oracle Data Provider for .NET (ODP.NET) using C#.

ODP.NET offers faster and reliable access to Oracle Database by using Oracle Native APIs. ODP.NET provides features to access any .NET application. The data access through ODP.NET can be done using a collection of classes contained in Oracle.DataAccess assembly. Figure 1.1 describes how data is accessed using ODP.NET. 

DataSet is a major component of ADO .NET. It is an in-memory cache of the data retrieved from the database. OracleDataAdapter  represents a set of data commands and a database connection that are used to fill the DataSet based on the query given.  OracleCommand represents SQL statements to execute against datasource. OracleConnection is used to build the database connection. 

 When this C# sample is run, a list of existing products from database appears in a tabular format. The user can change product details by overwriting existing values. To insert new product details the user can navigate to the end of the table and enter new product details. When data in the DataGrid (Data displayed in tabular format) is changed, the changes can be saved by clicking the 'Save' button. The 'Update' method of the OracleDataAdapter is called to resolve changes from DataSet back to the data source, therefore commiting the changes. This demonstrates DML operations on a DataSet through Oracle Data Provider for .NET (ODP.NET).

User Notes with Screen Shots

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When this sample application is run, a list of Products from database is displayed as shown in figure 1.2,  The user can add new products by appending new data in the DataGrid displayed, also the user can update the existing data for products by overwriting the existing values. To commit changes the user can click the 'Save' button. On clicking the 'Close' button, the application gets closed. 

Figure 1.2: Screen shot for Manipulate Products Sample 

• Visual C# installed with MS Development Environment 7.0 version (MS Visual Studio .NET)  including MS .NET Framework 1.0 version  

• Oracle8i Database or later running SQL*Net TCP/IP listener (can be downloaded here )

• Oracle Data Provider for .NET (ODP.NET) (can be downloaded here )

Unzip DMLOperOnDS.zip using Winzip or command utility to your convenient directory referred to as <Extract_Dir>. Extraction of the zip file results in the creation of 'DMLOperOnDS' directory.  Refer Description of Sample Files section for more details.     

Connect to your database as any user and run the script <Extract_Dir>\DMLOperOnDS\Setup\DatabaseSetup.sql at the SQL prompt
SQL> @<Extract_Dir>\DMLOperOnDS\Setup\DatabaseSetup.sql

This script will prompt for the username, password and connectstring. You may choose any existing username. Products table will get created in specified users schema.

 

Preparing and Running the Sample

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1. Ensure that the Database setup has been completed. 

2. Open DMLOperOnDS.sln using Visual Studio .NET from <Extract_Dir>\DMLOperOnDS folder. 

3. Edit ConnectionParams.cs file to change the database connection parameters i.e.Username, Password, TNSName for database .You need to input the same values of connection parameters as given while doing the Database Setup . Save this file.

4. Ensure that the following .NET Component References have been added to DMLOperOnDS project: 
          System, 
          System.Data, 
          System.Drawing, 
          System.Windows.Forms, 
          System.XML,
          Oracle.DataAccess. 

To add the above .NET Components 
a)Go to Menu ->View-> Solution Explorer. 
b)Right click on DMLOperOnDS project, choose 'Add Reference'. 
c)Choose the above .NET Components from the list displayed. 
d)Click 'Select', then OK. 
e) The chosen .NET component gets added to the project. 

5. Build and run the sample.

Following is the directory structure of the DMLOperOnDS.zip :

Please enter your comments about this sample in the OTN Sample Code Discussion Forum.