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How to update a dataset from a table?
Calls the respective INSERT, UPDATE, or DELETE statements for each inserted, updated, or deleted row in the specified DataSet from a DataTable named “Table.” The DataSet used to update the data source. The number of rows successfully updated from the DataSet. The source table is invalid.
Which is dataset used to update the data source?
The DataSet used to update the data source. The number of rows successfully updated from the DataSet. The source table is invalid. An attempt to execute an INSERT, UPDATE, or DELETE statement resulted in zero records affected. The following example uses the derived class, OleDbDataAdapter, to Update the data source.
How are dataadapters used to update a table?
For example, the following code ensures that the deleted rows of the table are processed first, then the updated rows, and then the inserted rows. You can use a DataAdapter to retrieve and update the data. The sample uses DataAdapter.AcceptChangesDuringFill to clone the data in the database.
How does the DataAdapter update the rowstate property?
When an application calls the Update method, the DataAdapter examines the RowState property, and executes the required INSERT, UPDATE, or DELETE statements iteratively for each row, based on the order of the indexes configured in the DataSet.
What does the dataadapter.update ( dataset ) method do?
Calls the respective INSERT, UPDATE, or DELETE statements for each inserted, updated, or deleted row in the specified DataSet from a DataTable named “Table.” The DataSet used to update the data source.
How to delete row from DataTable and use stack overflow?
SqlCommand cmd = new SqlCommand (“TRUNCATE TABLE PasswoerterTable”, connection); cmd.ExecuteNonQuery (); PasswoerterDataTable.Rows.Clear (); // No need to call Fill again. Thanks for contributing an answer to Stack Overflow!
How does the update method in database work?
The Update method looks at the rows present in your PasswoerterDataTable and checks their RowState property. If it finds something to update then a command is executed to reflect the changes back to the database. But you have cleared the rows from PasswoerterDataTable so Update has nothing to update and your database table is left unchanged.