I'm new to SharePoint and I'm working with web parts.
I have learned how to create a basic webpart and how to deploy it...but I don't have any ideas about how to create a web part that adds updates and deletes records from a database.
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Making a Web Part that adds, updates or deletes item from a database is just standard ASP.NET programming. For instance if you want to insert a record to a database then you probably would like to add a button to your Web Part that has a click-handler method in which you make the database operations.