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ADO Recordset Object


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The Recordset object provides a method of accessing our data. This recordset object depends opon the understanding of the Connection object.

A D V E R T I S E M E N T



ActiveX data Object(ADO) Recordset Objects represents the entire set of records from a base table or the results of an executed command. At any time, Recordset object refers to only a single record within the set as the current record.


Use the Recordset object to issue Structured Query Language (SQL) SELECT commands in folders.


For example:


Dim Conn as New ADODB.Connection
Dim Rs as New ADODB.Recordset
Conn.Provider = "ExOLEDB.DataSource"
Conn.Open RootFolderURL

Set Rs.ActiveConnection = Conn
"select ""DAV:displayname"" " _
& "from scope('shallow traversal of ""URL""')" _
& "Where ""DAV:ishidden"" = False"

'...
Conn.Close
Rs.Close
Set Conn = Nothing
Set Rs = Nothing


ActiveX Data Object(ADO) Recordset objects is used to manipulate data from a provider. When we use ADO, we manipulate data almost entirely using Recordset objects. All Recordset objects consist of records (rows) and columns (fields). Depending on the functional support by the provider, some Recordset methods or properties may not be available.


When we first open a Recordset, the current record pointer will point to the First record and the BOF and EOF properties are False. If there are no records are present, the BOF and EOF property are True.


There are two type of Updating that will supported by (ADO) Recordset objects :


1: Immediate updating

2: Batch updating


1: Immediate updating

When you call the Update method all changes are written immediately to the database .

2: Batch updating

The provider will cache the multiple changes and then send them to the record in the database with the UpdateBatch method.




What is Curser?

Curser is a database element that updatability of data ,controls record navigation, and the visibility of changes made to therecords in the database by other users.


There are four different cursor types defined in ADO:

1: Dynamic cursor

2: Keyset cursor

3: Static cursor

4: Forward-only cursor


1: Dynamic cursor

Allows us to additions ,view , changes, and deletions by the other users; it also allows all types of movement through the Recordset that does not rely on bookmarks; and allows bookmarks if the provider supports them.


2: Keyset cursor

Behaves like a dynamic cursor, except that it prevents us from seeing the records that the other users add, and prevents access to the records that other users delete. Data changes by other users will still be visible. It always supports bookmarks and therefore allows all types of movement through the Recordset.


3: Static cursor

Provides a static copy of a set of the records for us to use to find the data or generates that reports;it always allows bookmarks and therefore allows all types of movement through the Recordset. Additions,deletions or changes by other users will not be visible. This is the only type of cursor allowed when you open a client-side ADO Recordset object.


4: Forward-only cursor

Allows us to only scroll forward through the Recordset in the database. Changes,Additions or deletions by other users will not be visible. This improves performance in situations where you need to make only a single pass through a Recordset.




Properties of ADO Recordset Object.


Property Description
AbsolutePage

Sets or returns a value that specifies the page number in the Recordset object

AbsolutePosition

Sets or returns a value that specifies the ordinal position of the current record in the Recordset object

ActiveCommand

Returns the Command object associated with the Recordset

ActiveConnection

Sets or returns a definition for a connection if the connection is closed, or the current Connection object if the connection is open

BOF

Returns true if the current record position is before the first record, otherwise false

Bookmark

Sets or returns a bookmark. The bookmark saves the position of the current record

CacheSize Sets or returns the number of records that can be cached
CursorLocation Sets or returns the location of the cursor service
CursorType Sets or returns the cursor type of a Recordset object
DataMember

Sets or returns the name of the data member that will be retrieved from the object referenced by the DataSource property

DataSource

Specifies an object containing data to be represented as a Recordset object

EditMode Returns the editing status of the current record
EOF

Returns true if the current record position is after the last record, otherwise false

Filter Sets or returns a filter for the data in a Recordset object
Index

Sets or returns the name of the current index for a Recordset object

LockType

Sets or returns a value that specifies the type of locking when editing a record in a Recordset

MarshalOptions

Sets or returns a value that specifies which records are to be returned to the server

MaxRecords

Sets or returns the maximum number of records to return to a Recordset object from a query

PageCount Returns the number of pages with data in a Recordset object
PageSize

Sets or returns the maximum number of records allowed on a single page of a Recordset object

RecordCount Returns the number of records in a Recordset object
Sort Sets or returns the field names in the Recordset to sort on
Source

Sets a string value or a Command object reference, or returns a String value that indicates the data source of the Recordset object

State

Returns a value that describes if the Recordset object is open, closed, connecting, executing or retrieving data

Status

Returns the status of the current record with regard to batch updates or other bulk operations

StayInSync

Sets or returns whether the reference to the child records will change when the parent record position changes


Methods of ADO Recordset Object.


Methods Description
AddNew Creates a new record
Cancel Cancels an execution
CancelBatch Cancels a batch update
CancelUpdate Cancels changes made to a record of a Recordset object
Clone Creates a duplicate of an existing Recordset
Close Closes a Recordset
CompareBookmarks Compares two bookmarks
Delete Deletes a record or a group of records
Find Searches for a record in a Recordset that satisfies a specified criteria
GetRows Copies multiple records from a Recordset object into a two-dimensional array
GetString Returns a Recordset as a string
Move Moves the record pointer in a Recordset object
MoveFirst Moves the record pointer to the first record
MoveLast Moves the record pointer to the last record
MoveNext Moves the record pointer to the next record
MovePrevious Moves the record pointer to the previous record
NextRecordset

Clears the current Recordset object and returns the next Recordset object by looping through a series of commands

Open

Opens a database element that gives you access to records in a table, the results of a query, or to a saved Recordset

Requery

Updates the data in a Recordset by re-executing the query that made the original Recordset

Resync

Refreshes the data in the current Recordset from the original database

Save Saves a Recordset object to a file or a Stream object
Seek

Searches the index of a Recordset to find a record that matches the specified values

Supports

Returns a boolean value that defines whether or not a Recordset object supports a specific type of functionality

Update

Saves all changes made to a single record  in a Recordset object

UpdateBatch

Saves all changes in a Recordset to the database. Used when working in batch update mode


Events:


Events Description
EndOfRecordset

Triggered when you try to move to a record after the last record

FetchComplete

Triggered after all records in an asynchronous operation have been fetched

FetchProgress

Triggered periodically in an asynchronous operation, to state how many more records that have been fetched

FieldChangeComplete

Triggered after the value of a Field object change

MoveComplete

Triggered after the current position in the Recordset has changed

RecordChangeComplete Triggered after a record has changed
RecordsetChangeComplete Triggered after the Recordset has changed
WillChangeField Triggered before the value of a Field object change
WillChangeRecord Triggered before a record change
WillChangeRecordset Triggered before a Recordset change
WillMove Triggered before the current position in the Recordset changes


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Keywords:ADO Sort, ado recordset sort, adodb recordset sort, visual basic sort, recordset sort, visual basic ado

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