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Base class for BLOB field data
Source position: db.pas line 795
type TBlobField = class(TField) |
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protected |
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procedure FreeBuffers; override; |
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function GetAsString; override; |
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function GetAsVariant; override; |
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function GetBlobSize; virtual; |
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function GetIsNull; override; |
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procedure GetText(); override; |
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procedure SetAsString(); override; |
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procedure SetText(); override; |
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procedure SetVarValue(); override; |
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function GetAsWideString; override; |
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procedure SetAsWideString(); override; |
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public |
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constructor Create(); override; |
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Create a new instance of a TBlobField class. |
procedure Clear; override; |
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Clear the BLOB field's contents |
public |
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class function IsBlob; override; |
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Is the field a blob field |
public |
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procedure LoadFromFile(); |
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Load the contents of the field frop a file |
procedure LoadFromStream(); |
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Load the field's contents from stream |
procedure SaveToFile(); |
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Save field contents to a file |
procedure SaveToStream(); |
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Save the field's contents to stream |
procedure SetFieldType(); override; |
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Set field type |
property BlobSize: LongInt; [r] |
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Size of the current blob |
property Modified: Boolean; [rw] |
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Has the field's contents been modified. |
property Value: String; [rw] |
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Return the field's contents as a string |
property Transliterate: Boolean; [rw] |
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Should the contents of the field be transliterated |
published |
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Type of blob |
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property Size; |
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Size of the blob field |
end; |
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Base class for BLOB field data |
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Provide access to the contents of a single field in a record |
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TBLobField is the class used when a dataset must manage BLOB data. (TField.DataType equals ftBLOB). It initializes some of the properties of the TField class, and overrides some of its methods to be able to work with BLOB fields. It also serves as parent class for some specialized blob-like field types such as TMemoField, TWideMemoField or TGraphicField
It should never be necessary to create an instance of TBlobField manually, a field of this class will be instantiated automatically for each BLOB field when a dataset is opened.
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Base class for records-based data-access |
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Provide access to the contents of a single field in a record |
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Base class for MEMO (text BLOB) field data |
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Field class for wide MEMO (widestring text BLOB) field data |
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Field class for graphical BLOB field data |
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