Updating data sources with data adapter Dating site amora bucuresti
Select Command = sql Cmd d Set = New Data Set sql Dapter. If the question is: Why is it needed to specify the values twice (when the new Data Row is created and also when the parameters are defined): First, while adding a new Data Row: d Row(1) = "" Then the answer is "No, you don't need to indicate this twice".Fill(d Set, "My Table") d Table = New Data Table d Table = d Set. Specifying the values twice is not only a minor annoyance.
When an application calls the Update method, the Data Adapter examines the Row State property, and executes the required INSERT, UPDATE, or DELETE statements iteratively for each row, based on the order of the indexes configured in the Data Set.
Tables("My Table") sql Cmd = New Sql Command("INSERT INTO My Table (Col1, Col2) VALUES (@Val1, @Val2)", sql Conn) With sql Cmd . It might also mean a high risk for a Data Integrity bug like in this example where the data is set directly.
So if you would try to omit that line the changes doesn't reflect in your datasource as what you have noticed..
If the connection is open before Fill is called, it remains open.
The Fill operation then adds the rows to destination Data Table objects in the Data Set, creating the Data Table objects if they do not already exist.
For example, Update might execute a DELETE statement, followed by an INSERT statement, and then another DELETE statement, due to the ordering of the rows in the Data Table.