JetGetIndexInfo Function

Artikkel
08/26/2021

Applies to: Windows | Windows Server

JetGetIndexInfo Function

The JetGetIndexInfo function retrieves information about an index.

    JET_ERR JET_API JetGetIndexInfo(
      __in          JET_SESID sesid,
      __in          JET_DBID dbid,
      __in          const tchar* szTableName,
      __in          const tchar* szIndexName,
      __out         void* pvResult,
      __in          unsigned long cbResult,
      __in          unsigned long InfoLevel
    );

Parameters

sesid

The database session context to use for the API call.

dbid

The database identifier to use for the API call.

szTableName

The name of the table containing the index with the information to retrieve.

szIndexName

The name of the index with the information to retrieve.

pvResult

Pointer to a buffer that will receive the desired information. The buffer should be aligned to hold the type required. The type of the buffer is dependent on the InfoLevel parameter.

cbResult

The size, in bytes, of the buffer passed as pvResult.

InfoLevel

The information that will be stored in pvResult. The following options can be used for this parameter.

Value	Meaning
JET_IdxInfo	pvResult is interpreted as a JET_INDEXLIST structure. On success, the JET_INDEXLIST structure receives information about the index. On failure, the contents of pvBuffer are undefined.
JET_IdxInfoCount	pvResult is interpreted as a ULONG. On success, the ULONG holds the count of indexes on the specified table. szIndexName is ignored. On failure, the contents of pvBuffer are undefined.
JET_IdxInfoIndexId	pvResult is interpreted as a JET_INDEXID. On success, the JET_INDEXID structure receives information about the index. On failure, the contents of pvBuffer are undefined.
JET_IdxInfoLangid	JET_IdxInfoLangid is deprecated. Use JET_IdxInfoLCID and the LANGIDFROMLCID macro instead.
JET_IdxInfoLCID	pvResult is interpreted as an LCID. On success, the LCID holds the Locale Identifier of the index. On failure, the contents of pvBuffer are undefined. Windows XP: JET_IdxInfoLCID is introduced in Windows XP.
JET_IdxInfoList	pvResult is interpreted as a JET_INDEXLIST structure. On success, the JET_INDEXLIST structure receives information about the index. On failure, the contents of pvBuffer are undefined.
JET_IdxInfoOLC	JET_IdxInfoOLC is obsolete.
JET_IdxInfoResetOLC	JET_IdxInfoResetOLC is obsolete.
JET_IdxInfoSpaceAlloc	pvResult is interpreted as a ULONG. On success, the ULONG holds the space usage of the index. On failure, the contents of pvBuffer are undefined.
JET_IdxInfoSysTabCursor	JET_IdxInfoSysTabCursor is obsolete.
JET_IdxInfoVarSegMac	pvResult is interpreted as a USHORT. On success, the USHORT holds the value of cbVarSegMac used when the index was created. See JET_INDEXCREATE for a description of cbVarSegMac. On failure, the contents of pvBuffer are undefined.
JET_IdxInfoKeyMost	pvResult is interpreted as a USHORT. On success, the USHORT holds the value of cbKeyMost used when the index was created. See JET_INDEXCREATE for a description of cbKeyMost. On failure, the contents of pvBuffer are undefined. Windows Vista: JET_IdxInfoKeyMost is introduced in Windows Vista.
JET_IdxInfoCreateIndex	pvResult is interpreted as a JET_INDEXCREATE structure. On failure, the contents of pvBuffer are undefined. Windows 7: JET_IdxInfoCreateIndex is introduced in Windows 7.
JET_IdxInfoCreateIndex2	pvResult is interpreted as a JET_INDEXCREATE2 structure. On failure, the contents of pvBuffer are undefined. Windows 7: JET_IdxInfoCreateIndex2 is introduced in Windows 7.

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_errIndexNotFound	The specified index cannot be found in the specified table.
JET_wrnBufferTruncated	The buffer passed in as pvResult was too small. The contents of the buffer are undefined.

Remarks

JetGetIndexInfo and JetGetTableIndexInfo retrieve identical information about an index. The difference is in how the table is specified. JetGetIndexInfo expects a database (dbid) and name of a table (szTableName), while JetGetTableIndexInfo expects a table identifier (tableid).

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.
Library	Use ESENT.lib.
DLL	Requires ESENT.dll.
Unicode	Implemented as JetGetIndexInfoW (Unicode) and JetGetIndexInfoA (ANSI).

Del via

JetGetIndexInfo Function