Updating database using vb net
Updating database using vb net - bank consolidating student loans
As you saw in the Data Table, Data Row, and Data Column sections at the beginning of this article, you can use the Delete method of a Data Row to delete a row.The Add New method of the Data Table adds a row to a Data Table.
Table Adapter uses the key column in the Where clause of its Update and Delete statements so if the value of key column changes, things get messy. Then I have a separate "Update" button that the users pushes to start the update process.As you can see from the code, I called the Find method to find the row and called the Delete method of the Data Row.After that I called the Data Adapter's Update method to save the changes to the database table. I would like to give users the ability to update from the datagridview and have the program immediately update the sql server table. Now I am wondering which events to use to validate and update the database, wheter to enable/disable the validating events? The problem is that I'm trying to edit, validate and update behind the scenes by allowing the user to make changes directly to the grid.My questions related to this are: On which events should I be editing the changed data? How will I need to keep track when user has changed a key column and an update would no longer work? I usually code the data adpater, dataset, and connection string rather than from the toolbox and using an xsd and I usually do not update directly to the datagridview.That way you could edit many rows and just have one update going on to handle all of the actions.
Data graye: Your solution is closer to what I'm looking for and you will get most of the points.You can write an event handler for when a user is attempting to change to another row.Then you could query the Data Grid View to see if anything has changed, and then perform an update to the backend database.etc Get me started, please Code Cruiser: Your comment was helpful but not what I'm looking for. I was trying to get straight when to validate, when to update, whether I have to code to handle if user changes a key column?If the code is not available just answer those questions and I'll go from there.The way the architecture works with the Data Adapter is that you can make any changes you want to the filled Data Set, and it won't affect the database until you call the Update method.