Dataadapter not updating


13-Mar-2015 15:05

By Dan Mabbutt Much of Microsoft's data technology, ADO. This object reads the database and creates an in-memory copy of that part of the database that your program needs. NET), it's a little (but only just a little) like the old Recordset object.

A Data Set object will usually correspond to a real database table or view (or perhaps several).

are generic templates that are automatically filled with individual values from every modified row through the parameters mechanism.

For every column that you propagate to the data source on Update, a parameter should be added to the Insert Command, Update Command, or Delete Command.

An Invalid Operation Exception will occur if the Fill method is called and the table contains a user-defined type that is not available on the client computer.

For more information, see Creating and Using User-Defined Types in SQL Server Books Online., and Sql Connection to select records from a database and populate a Data Set with the selected rows. To accomplish this, the method is passed an initialized Data Set, a connection string, and a query string that is a Transact-SQL SELECT statement.

(It's possible to create a Data Set using a data structure without involving a database.) But Data Set is a "disconnected" view of the database. NET creates a Data Set, there is no need for an active connection to the database and this helps a lot in scalability (when the amount of data that must be handled increases) because the program only has to connect with a database server for microseconds when reading or writing.

When the fills a Data Set, it creates the necessary tables and columns for the returned data if they do not already exist.

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Updates the values in the database by executing the respective INSERT, UPDATE, or DELETE statements for each inserted, updated, or deleted row in the specified array in the Data Set.(Inherited from Db Data Adapter.)Updates the values in the database by executing the respective INSERT, UPDATE, or DELETE statements for each inserted, updated, or deleted row in the Data Set with the specified Data Table name.(Inherited from Db Data Adapter.)Updates the values in the database by executing the respective INSERT, UPDATE, or DELETE statements for each inserted, updated, or deleted row in the specified Data Table.(Inherited from Db Data Adapter.) provides this bridge by mapping Fill, which changes the data in the Data Set to match the data in the data source, and Update, which changes the data in the data source to match the data in the Data Set, using the appropriate Transact-SQL statements against the data source. For every inserted, modified, and deleted row, the Update method determines the type of change that has been performed on it (Insert, Update, or Delete).

Depending on the type of change, the Insert, Update, or Delete command template executes to propagate the modified row to the data source.



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