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Parameter description class
Source position: db.pas line 1141
type TParam = class(TCollectionItem) end; |
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public |
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constructor Create(); |
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Create a new parameter value |
procedure Assign(); override; |
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Assign one parameter instance to another |
procedure AssignField(); |
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Copy value from field instance |
procedure AssignToField(); |
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Assign parameter value to field |
procedure AssignFieldValue(); |
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Assign field value to the parameter. |
procedure AssignFromField(); |
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Copy field type and value |
procedure Clear; |
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Clear the parameter value |
procedure GetData(); |
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Get the parameter value from a memory buffer |
function GetDataSize; |
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Return the size of the data. |
procedure LoadFromFile(); |
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Load a parameter value from file |
procedure LoadFromStream(); |
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Load a parameter value from stream |
procedure SetBlobData(); |
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Set BLOB data |
procedure SetData(); |
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Set the parameter value from a buffer |
property AsBCD: Currency; [rw] |
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Get or set parameter value as BCD value |
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Return parameter value as a blob |
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property AsBoolean: Boolean; [rw] |
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Get/Set parameter value as a boolean value |
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Get or set parameter value as TBytes |
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property AsCurrency: Currency; [rw] |
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Get/Set parameter value as a currency value |
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Get/Set parameter value as a date (TDateTime) value |
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property AsDateTime: TDateTime; [rw] |
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Get/Set parameter value as a date/time (TDateTime) value |
property AsFloat: Double; [rw] |
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Get/Set parameter value as a floating-point value |
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Get/Set parameter value as an integer (32-bit) value |
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property AsLargeInt: LargeInt; [rw] |
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Get/Set parameter value as a 64-bit integer value |
property AsMemo: string; [rw] |
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Get/Set parameter value as a memo (string) value |
property AsSmallInt: LongInt; [rw] |
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Get/Set parameter value as a smallint value |
property AsString: string; [rw] |
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Get/Set parameter value as a string value |
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Get/Set parameter value as a time (TDateTime) value |
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Get/Set parameter value as a word value |
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property AsFMTBCD: TBCD; [rw] |
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Parameter value as a BCD value |
property Bound: Boolean; [rw] |
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Is the parameter value bound (set to fixed value) |
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Dataset to which this parameter belongs |
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property IsNull: Boolean; [r] |
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Is the parameter empty |
property NativeStr: string; [rw] |
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No description available |
property Text: string; [rw] |
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Read or write the value of the parameter as a string |
property AsWideString: WideString; [rw] |
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Get/Set the value as a widestring |
published |
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property DataType: TFieldType; [rw] |
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Data type of the parameter |
property Name: string; [rw] |
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Name of the parameter |
property NumericScale: Integer; [rw] |
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Numeric scale |
property ParamType: TParamType; [rw] |
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Type of parameter |
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Precision of the BCD value |
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Size of the parameter |
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property Value: Variant; [rws] |
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Value as a variant |
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Parameter description class |
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TParam is one item in a TParams collection. It describes the name (TParam.Name), type (ParamType) and value (TParam.Value) of a parameter in a parametrized query or stored procedure. Under normal circumstances, it should never be necessary to create a TParam instance manually; the TDataset descendent that owns the parameters should have created all necessary TParam instances.
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A collection of parameter values for SQL-based datasets |