Updating database with datagrid dating personal site
You can avoid building Command objects manually by using Command Builder.
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.
That worked fine for updates, but then I found that three records were inserted into the database when I added a new row to the Data Grid View (the data gets inserted, then a null value, then the data again).
After digging around on the web for most of the day, I found that the , but would when using a click on a save button (since all the Data Grid View events would complete before the button click event fires).
Listing 5-46 Creates a new Data Row, sets the data of Data Row members, and adds rows to the table using the Add method of Data Table. Listing 5-48 show the code on the Insert Command button-click event.
As you can see from listing 5-48, I created a filled Data Set and created a new Data Row using the Data Table. After creating a Data Row, I set its column values and called the Data Adapter's Update method and displayed data in the Data Grid.
When a database receives a SQL statement, it determines if the statement has already been executed and stored in memory.
If the statement does exist in memory, Oracle Database can reuse it and skip the task of parsing and optimizing the statement.
I tried in conjunction with my update sub, but none of those would update the database when the focus left the edited row. Surley it's possible to commit the changes made on the Data Grid View to the database when the focus is moved off the edited/new row.Using bind variables makes the statement reusable with different input values.Using bind variables also improves query performance in the database, eliminates the need for special handling of literal quotation marks in the input, and protects against SQL injection attacks.The Add New method of the Data Table adds a row to a Data Table.To change an existing row's data, you can directly assign a row's value. Delete() In this example, I'll show you how to add edit, and remove, data from the Northwind database.
The following code shows a typical contains a client copy of the database data.