AppendChunk Method

Appends data to a large text or binary data Field or Parameter object.

Syntax

{field | parameter}.AppendChunk Data

The AppendChunk method syntax has these parts.

Part

Description

field

An object variable representing a Field object in the Fields collection of an open Recordset object.

parameter

An object variable representing a Parameter object in the Parameters collection of a Command object.

Data

A Variant containing the data you want to append to field or parameter.

Remarks

Use the AppendChunk method on a Field or Parameter object to fill it with long binary or character data. In situations where system memory is limited, you can use the AppendChunk method to manipulate long values in portions rather than in their entirety.

Field

If the adFldLong bit in the Attributes property of a Field object is set to true, you can use the AppendChunk method for that field.

The first AppendChunk call on a Field object writes data to the field, overwriting any existing data. Subsequent AppendChunk calls add to existing data. If you are appending data to one field and then you set or read the value of another field in the current record, ADO assumes that you are done appending data to the first field. If you call the AppendChunk method on the first field again, ADO interprets the call as a new AppendChunk operation and overwrites the existing data. Accessing fields in other Recordset objects (that are not clones of the first Recordset object) will not disrupt AppendChunk operations.

If there is no current record when you call AppendChunk on a Field object, an error occurs.

Parameter

If the adFldLong bit in the Attributes property of a Parameter object is set to true, you can use the AppendChunk method for that parameter.

The first AppendChunk call on a Field object writes data to the field, overwriting any existing data. Subsequent AppendChunk calls on a Parameter object add to existing parameter data. An AppendChunk call that passes a Null value generates an error; you must manually set the Value property of the Parameter object to a zero-length string ("") in order to clear its value.

Applies To