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JetGetRecordSize Function

Windows

The JetGetRecordSize function retrieves record size information from the desired location.

Windows Vista:   JetGetRecordSize is introduced in Windows Vista.

JET_ERR JET_API JetGetRecordSize(
  __in          JET_SESID sesid,
  __in          JET_TABLEID tableid,
  __out         JET_RECSIZE* precsize,
  __in          const JET_GRBIT grbit
);

Parameters

sesid

Identifies the database session context that will be used for the API call.

tableid

Identifies the table or cursor that will be used for the API call. The cursor must be positioned on a record, or have an update prepared.

precsize

A pointer to an output buffer for the JET_RECSIZE structure.

grbit

This is one or more of the following values.

Value

Meaning

JET_bitRecordSizeInCopyBuffer

This retrieves the size of the record that is in the copy buffer prepared for update. Otherwise, the tableid or cursor must be positioned on a record, and that record will be used.

JET_bitRecordSizeRunningTotal

When this bit is specified, the JET_RECSIZE is not zeroed before filling the contents, effectively acting as an accumulation of the statistics for multiple records visited or updated.

JET_bitRecordSizeLocal

This causes the API to ignore non-intrinsic Long Values. For example, only the local record on the page will be used.

Return Value

This function returns the JET_ERR datatype with one of the following return codes. For more information about the possible ESE errors, see Extensible Storage Engine Errors and Error Handling Parameters.

Return code

Description

JET_errSuccess

The operation completed successfully.

JET_errInvalidGrbit

One of the requested options was invalid or not implemented. This error will be returned by the JetGetRecordSize function when an illegal grbit is specified.

JET_errNotInitialized

It is not possible to complete the operation because the instance associated with the session has not been initialized.

JET_errClientRequestToStopJetService

It is not possible to complete the operation because all activity on the instance associated with the session has ceased as a result of a call to JetStopService.

JET_errInstanceUnavailable

It is not possible to complete the operation because the instance associated with the session has encountered a fatal error that requires that access to all data be revoked to protect the integrity of that data.

Windows XP:  JET_errInstanceUnavailable will only be returned by Windows XP and later releases.

JET_errTermInProgress

It is not possible to complete the operation because the instance associated with the session is being shut down.

JET_errRestoreInProgress

It is not possible to complete the operation because a restore operation is in progress on the instance associated with the session.

JET_errSessionSharingViolation

It is illegal to use the same session from more than one thread at the same time.

Windows XP:  JET_errInstanceUnavailable will only be returned by Windows XP and later releases.

JET_errNoCurrentRecord

This can happen if the cursor was positioned incorrectly.

JET_errRecordDeleted

If the cursor was not positioned in a transaction, this can happen if another thread deletes the record out from under this session.

JET_errInvalidParameter

This can be returned if a NULLprecsize was passed.

Remarks

The size of the key accumulated in the cbOverhead field of JET_RECSIZE, is affected by JET_bitRecordSizeInCopyBuffer. If this bit is specified, the key size accumulated in the cbOverhead field is the full key size. If this bit is not used, then the key size accumulated will not include any size saved due to key prefix compression.

Requirements

Client

Requires Windows Vista.

Server

Requires Windows Server 2008.

Header

Declared in Esent.h.

Library

Use ESENT.lib.

DLL

Requires ESENT.dll.

See Also

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