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Updating data sources with data adapters ado net

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When Update is called, the Data Adapter will attempt to execute each query (UPDATE, INSERT, DELETE) on every row of the Data Set that has been updated, inserted, and deleted.

For example, if you call Delete on a row on the Data Set, then when Update is called on the Data Adapter, the Delete Command of the Data Adapter will be called using the particular row in the Data Set.

You must explicitly set the commands before calling either by returning the auto-increment value as an output parameter of a stored procedure and mapping that to a column in a table, by returning the auto-increment value in the first row of a result set returned by a stored procedure or SQL statement, or by using the are sent to the data source is important.

For example, if a primary key value for an existing row is updated, and a new row has been added with the new primary key value as a foreign key, it is important to process the update before the insert.

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.

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Dim autogen As New Sql Command Builder(da) ' Load a data set. Fill(ds, "Categories") ' Get a reference to the "Categories" Data Table. This property contains an Sql Parameter Collection object that in turn contains one Sql Parameter object for each formal parameter.

There are certain types of connection manager that are compatable with this task so we cannot just create any connection manager and these are detailed in a few graphics time.

Double click on the task itself to take a look at the custom user interface provided to us for this task.

Whilst on the general tab, drop down the combobox next to the property.

In here you will see the types of connection manager which this task will accept.

The properties of the Sql Data Adapter Object update the database with the data modifications, that are run on a Data Set object.

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.

The Sql Parameter object's Parameter Name property matches the name of the formal parameter (including the ""), the Source Column property contains the name of the column from which the value is to come, and the Source Version property specifies the version of the value that is to be used. Add( _ New Sql Parameter("@Description", Sql Db Type.

encounters a change to a Data Row, it uses the Insert Command, Update Command, or Delete Command to process the change.

To propagate changes, additions, and deletions back to a data source, call the Sql Data Adapter class's Update method, passing the Data Set and the name of the table that is to be updated. Update(ds, "Categories") ' Close the database connection. Close( ) Step 5 forces the Sql Command Builder object to generate SQL statements for performing the database update, insert, and delete operations. Select("Category Name = 'Dairy Products'")(0) ' Change the value in the Description column.

For example, the following call to Update writes changes from the Data Table named Categories back to the SQL Server table of the same name: statement that was provided to the Sql Data Adapter object or can be explicitly provided to the Sql Data Adapter object. When the Update method is called, the Sql Data Adapter object notes that no values have been set for its Update Command, Insert Command, and Delete Command prperties, and therefore queries the Sql Command Builder object for these commands. row("Description") = "Milk and stuff" ' Perform the update. Update(ds, "Categories") ' Close the database connection.