RAD Studio VCL Reference
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TParam.AsBlob Property
TParam Class | TParam Members | DB Namespace | Description | See Also
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Specifies the value of the parameter when it represents a binary large object (BLOB) field.

Pascal
property AsBlob: TBlobData;
C++
__property TBlobData AsBlob;
Description

Set AsBlob to assign the value for a Blob field to the parameter. AsBlob takes a TBlobData (Delphi) or an AnsiString (C++) value, which can act as an untyped string of bytes. Setting AsBlob sets the DataType property to ftBlob. 

For example, if the variable Buffer is of type PChar and contains binary data read from a file, the contents of Buffer are directly assigned to the BLOB parameter using the AsBlob property:  

Copy Code
Query1.Params[0].AsBlob := Buffer;

Note: Applications seldom need to read AsBlob because Blob fields can't be used as output parameters.
 

See Also
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