If the statement does exist in memory, Oracle Database can reuse it and skip the task of parsing and optimizing the statement.Using bind variables makes the statement reusable with different input values. Open() str SQL = "SELECT * FROM tbl_User" datest = New Ole Db. Stream Reader Dim str User Array() As String Dim new Row As Data Row Dim txt File As String = "\class.txt" Dim new ID As Integer If IO.
You can avoid building Command objects manually by using Command Builder.In this section, you will add a button that enables client data changes to be saved back to the database.The following section will show you how to test updating, inserting, and deleting the data.Note: The Tables member of Data Set represents all Data Table objects attached to a Data Set. Adding a Data Row to a Data Table In this example, I'll show you how to add edit, and remove, data from the Northwind database.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. I'll display the result of the Customers table in a Data Grid after adding, updating, and deleting data from the table.The following code makes a connection to the database, fills a dataset with the data from the database, reads a txt file with user name and passwords, and should update the dataset and then the database.