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Recordset Object

A Recordset object represents the entire set of records from a base table or the results of an executed command. At any time, the Recordset object only refers to a single record within the set as the current record.



Collections

Fields, Properties

Properties

AbsolutePage, AbsolutePosition, ActiveConnection, BOF, Bookmark, CacheSize, CursorType, EditMode, EOF, Filter, LockType, MaxRecords, PageCount, PageSize, RecordCount, Source, Status

Methods

AddNew, CancelBatch, CancelUpdate, Clone, Close, Delete, GetRows, Move, MoveFirst, MoveLast, MoveNext, MovePrevious, NextRecordset, Open, Requery, Resync, Supports, Update, UpdateBatch

Remarks

You can create Recordset objects independently of a previously defined Connection object by passing a connection string with the Open method. ADO still creates a Connection object, but it doesn't assign that object to an object variable. However, if you are opening multiple Recordset objects over the same connection, you should explicitly create and open a Connection object; this assigns the Connection object to an object variable. If you do not use this object variable when opening your Recordset objects, ADO creates a new Connection object for each new Recordset object, even if you pass the same connection string.

You use Recordset objects to manipulate data from a provider at the record level. When you use ADO, you manipulate data almost entirely using Recordset objects. All Recordset objects are constructed using records (rows) and fields (columns). Depending on the functionality the provider exposes, some collections, methods, or properties of a Recordset object may not be available.

You can use one of four different cursor types when opening a Recordset object:

· Dynamic cursor ¾ allows you to view additions, changes, and deletions by other users, and allows all types of movement through the Recordset that don't rely on bookmarks; allows bookmarks if the provider supports them.

· Keyset cursor ¾ behaves like a dynamic cursor, except that it prevents you from seeing records that other users add, and prevents access to records that other users delete from your recordset; always allows bookmarks and therefore allows all types of movement through the Recordset. Data changes by other users will still be visible.

· Static cursor ¾ provides a static copy of a set of records for you to use to find data or generate reports; always allows bookmarks and therefore allows all types of movement through the Recordset. Additions, changes, or deletions by other users will not be visible.

· Forward-only cursor ¾ behaves identically to a static cursor except that it allows you to scroll only forward through records. This improves performance in situations where you need to make only a single pass through a recordset.

Set the CursorType property prior to opening the Recordset object to choose the cursor type of the Recordset object. You can also pass a CursorType argument with the Open method.

If you don't specify a cursor type, ADO opens a forward-only cursor by default.

You can create as many Recordset objects as needed. Different Recordset objects can access the same tables and fields without conflicting.

When you create a Recordset object, the current record is positioned to the first record (if any) and the BOF and EOF properties are set to False. If there are no records, the RecordCount property setting is 0, and the BOF and EOF property settings are True. If the Recordset is closed, most properties and methods will generate an error. Check (what???) before useing.

You can use the MoveFirst, MoveLast, MoveNext, and MovePrevious methods, as well as the Move method, and the AbsolutePosition, AbsolutePage, and Filter properties to reposition the current record, assuming the provider supports the relevant functionality. Forward-only Recordset objects support only the MoveNext method. When you use the Move methods to visit each record (or enumerate the Recordset), you can use the BOF and EOF properties to see if you've moved beyond the beginning or end of the Recordset object.

Recordset objects may support two types of updating: immediate and batched. In immediate updating, all changes to data are written immediately to the underlying data source once you call the Update method. You can also pass arrays of values as parameters with the AddNew and Update methods and simultaneously update several fields in a record.

If a provider supports batch updating, you can have the provider cache changes to more than one record and then transmit them in a single call to the database with the UpdateBatch method. This applies to changes made with the AddNew, Update, and Delete methods. After you call the UpdateBatch method, you can use the Status property to check for any data conflicts in order to resolve them.

Note You should use batch updating only with either a keyset or static cursor.

See Also

Connection

See also:


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