What is the difference between a Dynaset and Snapshot and how would you create

What is the difference between a Dynaset and Snapshot and
how would you create one?

Question Posted / suresh

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What is the difference between a Dynaset and Snapshot and how would you create one?..

Answer / george

All Recordset objects are constructed using records (rows)
and fields (columns). There are five types of Recordset
objects:

Table-type Recordset ::
********************
representation in code of a base table that you can use to
add, change,or delete records from a single database table
(Microsoft Jet workspaces only).

Dynaset-type Recordset ::
**********************
the result of a query that can have updatable records. A
dynaset-type Recordset object is a dynamic set of records
that you can use to add, change, or delete records from an
underlying database table or tables.
A dynaset-type Recordset object can contain fields from one
or more tables in a database. This type corresponds to an
ODBC keyset cursor.

Snapshot-type Recordset ::
**********************
a static copy of a set of records that you can use to find
data or generate reports. A snapshot-type Recordset object
can contain fields from one or more tables in a database
but can't be updated. This type corresponds to an ODBC
static cursor.

Forward-only-type Recordset::
***************************
identical to a snapshot except that no cursor is provided.
You can only scroll forward through records. This improves
performance in situations where you only need to make a
single pass through a result set. This type corresponds to
an ODBC forward-only cursor.

Dynamic-type Recordset ::
**********************
a query result set from one or more base tables in which
you can add,change, or delete records from a row-returning
query. Further, records other users add, delete, or edit in
the base tables also appear in your Recordset. This type
corresponds to an ODBC dynamic cursor (ODBCDirect
workspaces only).

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What is the difference between a Dynaset and Snapshot and how would you create one?..

Answer / suresh

A dynaset-type Recordset object is a dynamic set of records
that can contain fields from one or more tables or queries
in a database and may be updatable. In an ODBCDirect
database, a dynaset-type Recordset object corresponds to an
ODBC keyset cursor.
Remarks
A dynaset-type Recordset object is a type of Recordset
object you can use to manipulate data in an underlying
database table or tables.
It differs from a snapshot-type Recordset object because
the dynaset stores only the primary key for each record,
instead of actual data. As a result, a dynaset is updated
with changes made to the source data, while the snapshot is
not. Like the table-type Recordset object, a dynaset
retrieves the full record only when it's needed for editing
or display purposes.

A snapshot-type Recordset object is a static set of records
that you can use to examine data in an underlying table or
tables. In an ODBCDirect database, a snapshot-type
Recordset object corresponds to a static cursor.
Remarks
To create a snapshot-type Recordset object, use the
OpenRecordset method on an open database, on another
dynaset- or snapshot-type Recordset object, or on a
QueryDef object.

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