JET_SETINFO Structure

Artikkel
08/26/2021

Applies to: Windows | Windows Server

JET_SETINFO Structure

The JET_SETINFO structure contains optional input parameters for JetSetColumn. A NULL pointer can be passed where a pointer to this structure would otherwise be passed. The meaning of passing a NULL is the same as passing JET_SETINFO with cbStruct set to sizeof(JET_SETINFO), ibLongValue set to 0 (zero) and itagSequence set to 1.

typedef struct {
  unsigned long cbStruct;
  unsigned long ibLongValue;
  unsigned long itagSequence;
} JET_SETINFO;

Members

cbStruct

The size, in bytes, of the JET_SETINFO. This value confirms the presence of the following fields.

ibLongValue

The offset to the first byte to be set in a column of type JET_coltypLongBinary or JET_coltypLongText.

itagSequence

Describes the sequence number of value in a multi-valued column to be set. The array of values is one-based. The first value is sequence 1, not 0 (zero). If the record column has only one value then 1 should be passed as the itagSequence if that value is being replaced. A value of 0 (zero) means to add a new column value instance to the end of the sequence of column values.

With a column that can contain multiple values, it is only possible to use a sequence number larger than 1 in JetSetColumn and JetRetrieveColumn or 0 in JetSetColumn. In the current implementation of the engine, any column that was created with JET_bitColumnTagged can contain multiple values. Columns created with JET_bitColumnMultiValued differ from multi-valued tagged columns only in the way that they are indexed. See JET_INDEXCREATE for more information.

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_SETINFO Structure