However, primary key information is not included in the implicitly created schema unless the Data Adapter. When the Sql Data Adapter fills a Data Set, it creates the necessary tables and columns for the returned data if they do not already exist.If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site. encounters a change to a Data Row, it uses the Insert Command, Update Command, or Delete Command to process the change. Rows(0) category Row("Category Name") = "New Beverages" adapter. Write Line("Rows after update.") Dim row As Data Row For Each row In category Table. Write Line(": ", row(0), row(1)) Next End Using End Sub 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. This allows you to maximize the performance of your ADO. 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. By specifying a subset of rows to be updated, you can control the order in which inserts, updates, and deletes are processed. NET application by specifying command syntax at design time and, where possible, through the use of stored procedures. 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.
The Sql Command Builder object acts as a listener for Row Updating events, whenever the Data Adapter property is set. If it is included in the SELECT statement, the Td Command Builder will use the primary key column(s) to uniquely identify the target-row for an UPDATE or a DELETE statement. Refresh Schema if the Select Command property of the associated Td Data Adapter (Td Command Builder. Refresh Schema method updates the column information used to generate UPDATE, DELETE and INSERT statements in addition to updating the Td Connection and Td Transaction used for the Update.Otherwise, all columns returned by the SELECT statement are added to the WHERE clause Td Command Builder will register as a listener for Row Updating events generated by the associated Td Data Adapter (Td Command Builder. Td Command Builder will generate a new DML statement and set the Td Row Updating Event Args. DML statements are generated based on the columns that are changed (UPDATE) in an updated row or columns that are inserted (INSERT) into a brand new row (Td Row Updating Event Args. Therefore, UPDATE and INSERT statements are generated for each Row Updating event while the DELETE statement is static until the next call to Td Command Builder. Later, column information is used to generate UPDATE, DELETE or INSERT statements.
The target-row for an UPDATE or a DELETE statement is identified by The WHERE clause. Original Dim category Table As New Data Table adapter.