CADOField.AppendChunkmethod
Appends data to a large text or binary data `Field`.
Syntax
FUNCTION AppendChunk (BYREF dvData AS DVARIANT) AS HRESULTParameters
| Name | Description | |
|---|---|---|
dvData | A Variant that contains the data to append to the object. |
Return value
S_OK (0) or an HRESULT code.
Description
Appends data to a large text or binary data Field.
Remarks
Use the AppendChunk method on a Field 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.
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 finished 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.
Note: The AppendChunk method does not operate on Field objects of a Record object. It does not perform any operation and will produce a run-time error.
Reference
- Include file
CADOField.inc - Defined in AfxNova/CAdoFields.inc:329
- Documented in Databases/ADO Classes/CAdoFields Class.md
- Topic: CAdoFields Class