SetOption Method

    Example    Applies To

Temporarily overrides values for the Microsoft Jet database engine keys in the Windows Registry (Microsoft Jet workspaces only).

Syntax

VOIDSetOption(LONG lOptions,

LPVARIANT pvValue );

Parameters

Type Argument Description
LONG lOptions A Long which specifies the registry key. Possible values are described in Remarks.
LPVARIANT pvValue A pointer to a variant which specifies a new value for the registry key.

Settings

Each constant refers to the corresponding registry key in the path Jet\3.5\Engines\Jet 3.5\ (that is, dbSharedAsyncDelay corresponds to the key Jet\3.5\Engines\Jet 3.5\SharedAsyncDelay, and so on.).

Constant Description
dbPageTimeout The PageTimeout key
dbSharedAsyncDelay The SharedAsyncDelay key
dbExclusiveAsyncDelay The ExclusiveAsyncDelay key
dbLockRetry The LockRetry key
dbUserCommitSync The UserCommitSync key
dbImplicitCommitSync The ImplicitCommitSync key
dbMaxBufferSize The MaxBufferSize key
dbMaxLocksPerFile The MaxLocksPerFile key
dbLockDelay The LockDelay key
dbRecycleLVs The RecycleLVs key
dbFlushTransactionTimeout The FlushTransactionTimeout key

Remarks

Use the SetOption method to override registry values at run-time. New values established with the SetOption method remain in effect until changed again by another SetOption call, or until the DBEngine object is closed.

For further details on what the registry keys do, and appropriate values to set them to, see Initializing the Microsoft Jet 3.5 Database Engine.

Usage

#include <afxole.h>
#include <dbdao.h>

CdbDBEngine      dben;
COleVariant      vExclusiveAsyncDelay(10, VT_I2),
               vSharedAsyncDelay(15, VT_I2);
...
dben.SetOption(dbExclusiveAsyncDelay, &vExclusiveAsyncDelay);
dben.SetOption(dbSharedAsyncDelay,  &vSharedAsyncDelay);
...