JET_OBJECTINFO Structure

Artikkel
08/26/2021

Applies to: Windows | Windows Server

JET_OBJECTINFO Structure

The JET_OBJECTINFO structure holds information about an object. Tables are the only object types that are currently supported.

    typedef struct {
      unsigned long cbStruct;
      JET_OBJTYP objtyp;
      JET_DATESERIAL dtCreate;
      JET_DATESERIAL dtUpdate;
      JET_GRBIT grbit;
      unsigned long flags;
      unsigned long cRecord;
      unsigned long cPage;
    } JET_OBJECTINFO;

Members

cbStruct

The size, in bytes, of the JET_OBJECTINFO structure.

objtyp

Holds the JET_OBJTYP of the structure. Currently only tables will be returned (that is, JET_objtypTable).

dtCreate

Obsolete. Do not use.

dtUpdate

Obsolete. Do not use.

grbit

A group of bits that contain the options that are available for this call, which include zero or more of the following.

Value	Meaning
JET_bitTableInfoBookmark	The table can have bookmarks.
JET_bitTableInfoRollback	The table can be rolled back.
JET_bitTableInfoUpdatable	The table can be updated.

flags

A bit field that contains zero or more of the following flags.

Value	Meaning
JET_bitObjectSystem	The table is a System Table and is for internal use only.
JET_bitObjectTableDerived	The table inherited DDL from a template table.
JET_bitObjectTableFixedDDL	The DDL for the table cannot be modified.
JET_bitObjectTableNoFixedVarColumnsInDerivedTables	Used in conjunction with JET_bitObjectTableTemplate to disallow fixed or variable columns in derived tables (so that fixed or variable columns can be added to the template in the future). Windows XP: This value is introduced in Windows XP.
JET_bitObjectTableTemplate	The table is a template table.

cRecord

The number of records in the table.

This value is retrieved only if JET_OBJECTINFO was passed to JetGetObjectInfo.

cPage

The number of pages that are being used by the table.

This value is retrieved only if JET_OBJECTINFO was passed to JetGetObjectInfo.

Remarks

A JET_OBJECTINFO structure gets populated by a call to JetGetObjectInfo or JetGetTableInfo. If the API call does not succeed, the contents of the structure are undefined.

If applicable, the table statistics include the number of records and the number of pages that are in the clustered index (that is, the index containing the record data). The index statistics are accessed separately by name, using JetGetIndexInfo or JetGetTableIndexInfo.

Requirements

Requirement	Value
Client	Requires Windows Vista, Windows XP, or Windows 2000 Professional.
Server	Requires Windows Server 2008, Windows Server 2003, or Windows 2000 Server.
Header	Declared in Esent.h.

Del via

JET_OBJECTINFO Structure