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tony |
371 |
(*
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* Firebird Interface (fbintf). The fbintf components provide a set of
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* Pascal language bindings for the Firebird API. Although predominantly
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* a new development they include source code taken from IBX and may be
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* considered a derived product. This software thus also includes the copyright
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* notice and license conditions from IBX.
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*
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* Except for those parts dervied from IBX, contents of this file are subject
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* to the Initial Developer's Public License Version 1.0 (the "License"); you
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* may not use this file except in compliance with the License. You may obtain a
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* copy of the License here:
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*
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* http://www.firebirdsql.org/index.php?op=doc&id=idpl
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Initial Developer of the Original Code is Tony Whyman.
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*
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* The Original Code is (C) 2021 Tony Whyman, MWA Software
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* (http://www.mwasoftware.co.uk).
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*
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* All Rights Reserved.
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*
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* Contributor(s): ______________________________________.
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*
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*)
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unit FBNumeric;
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{$IFDEF MSWINDOWS}
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{$DEFINE WINDOWS}
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{$ENDIF}
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{$IFDEF FPC}
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{$mode delphi}
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{$codepage UTF8}
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{$interfaces COM}
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{$ENDIF}
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interface
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uses
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Classes, SysUtils, IB, FBActivityMonitor, FmtBCD;
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{ The IFBNumeric interface is a managed type to hold a fixed point integer
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as a 64-bit signed integer plus a scale factor. i.e. the scale factor is
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the base 10 exponent in
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Fixed Point Value = <64-bit signed integer> * 10^<scale factor>
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}
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tony |
381 |
function StrToNumeric(aValue: AnsiString): IFBNumeric;
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function DoubleToNumeric(aValue: double): IFBNumeric;
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function BCDToNumeric(aValue: TBCD): IFBNumeric;
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function CurrToNumeric(aValue: currency): IFBNumeric;
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function IntToNumeric(aValue: Int64): IFBNumeric;
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tony |
371 |
function NumericFromRawValues(aValue: Int64; aScale: integer): IFBNumeric;
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tony |
381 |
function NumericToDouble(aValue: Int64; aScale: integer): double;
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tony |
371 |
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function TryStrToNumeric(S: Ansistring; out Value: int64; out scale: integer): boolean;
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64 |
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function SafeSmallInt(aValue: Int64): Smallint;
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function SafeInteger(aValue: Int64): integer;
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tony |
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{Numeric Arithmetic}
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function NumericAdd(x,y: IFBNumeric): IFBNumeric; overload; {returns x + y}
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function NumericSubtract(x,y: IFBNumeric): IFBNumeric; overload; {returns x - y}
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function NumericMultiply(x,y: IFBNumeric): IFBNumeric; overload; {returns x * y}
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function NumericDivide(x,y: IFBNumeric): IFBNumeric; overload; {returns x / y}
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function NumericCompare(x,y: IFBNumeric): integer; overload; {returns -1: x < y; 0: x = y; 1: x > y}
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function NegateNumeric(x: IFBNumeric): IFBNumeric; overload; {returns -x}
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tony |
371 |
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tony |
381 |
{integer operations}
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function NumericAdd(x: IFBNumeric; y: int64): IFBNumeric; overload; {returns x + y}
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function NumericSubtract(x: IFBNumeric; y: int64): IFBNumeric; overload; {returns x - y}
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function NumericSubtract(x: int64; y: IFBNumeric): IFBNumeric; overload; {returns x - y}
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function NumericMultiply(x: IFBNumeric; y: int64): IFBNumeric; overload; {returns x * y}
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function NumericDivide(x: IFBNumeric; y: int64): IFBNumeric; overload; {returns x / y}
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function NumericDivide(x: int64; y: IFBNumeric): IFBNumeric; overload; {returns x / y}
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function NumericCompare(x: IFBNumeric; y: int64): integer; overload; {returns -1: x < y; 0: x = y; 1: x > y}
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{floating point operations}
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function NumericAdd(x: IFBNumeric; y: double): IFBNumeric; overload; {returns x + y}
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function NumericSubtract(x: IFBNumeric; y: double): IFBNumeric; overload; {returns x - y}
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function NumericSubtract(x: double; y: IFBNumeric): IFBNumeric; overload; {returns x - y}
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function NumericMultiply(x: IFBNumeric; y: double): IFBNumeric; overload; {returns x * y}
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function NumericDivide(x: IFBNumeric; y: double): IFBNumeric; overload; {returns x div y}
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function NumericDivide(x: double; y: IFBNumeric): IFBNumeric; overload; {returns x div y}
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function NumericCompare(x: IFBNumeric; y: double): integer; overload; {returns -1: x < y; 0: x = y; 1: x > y}
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tony |
371 |
implementation
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uses IBUtils, FBMessages, Math;
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type
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{ TIBNumeric }
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{ TFBNumeric }
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TFBNumeric = class(TFBInterfacedObject,IFBNumeric)
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private
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FValue: Int64;
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FScale: integer;
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public
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tony |
381 |
constructor Create(aValue: Int64; aScale: integer);
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constructor CreateFromInt(aValue: Int64);
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constructor CreateFromStr(aValue: AnsiString);
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constructor CreateFromDouble(aValue: double);
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constructor CreateFromCurr(aValue: Currency);
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constructor CreateFromBCD(aValue: TBCD);
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tony |
371 |
public
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{IFBNumeric}
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function getRawValue: Int64;
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118 |
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function getScale: integer;
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119 |
tony |
381 |
function AdjustScaleTo(aNewScale: integer): IFBNumeric;
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120 |
tony |
371 |
function getAsString: AnsiString;
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121 |
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function getAsDouble: double;
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122 |
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function getAsCurrency: Currency;
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123 |
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function getAsBCD: TBCD;
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124 |
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function getAsInt64: Int64; {scaled}
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125 |
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function getAsInteger: integer; {scaled - may be truncated}
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126 |
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function getAsSmallInt: SmallInt; {scaled - may be truncated}
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127 |
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end;
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128 |
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129 |
tony |
381 |
function StrToNumeric(aValue: AnsiString): IFBNumeric;
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130 |
tony |
371 |
begin
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131 |
tony |
381 |
Result := TFBNumeric.CreateFromStr(aValue);
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132 |
tony |
371 |
end;
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133 |
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134 |
tony |
381 |
function DoubleToNumeric(aValue: double): IFBNumeric;
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135 |
tony |
371 |
begin
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136 |
tony |
381 |
Result := TFBNumeric.CreateFromDouble(aValue);
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137 |
tony |
371 |
end;
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138 |
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139 |
tony |
381 |
function BCDToNumeric(aValue: TBCD): IFBNumeric;
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140 |
tony |
371 |
begin
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141 |
tony |
381 |
Result := TFBNumeric.CreateFromBCD(aValue);
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142 |
tony |
371 |
end;
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143 |
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144 |
tony |
381 |
function CurrToNumeric(aValue: currency): IFBNumeric;
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145 |
tony |
371 |
begin
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146 |
tony |
381 |
Result := TFBNumeric.CreateFromCurr(aValue);
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147 |
tony |
371 |
end;
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148 |
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149 |
tony |
381 |
function IntToNumeric(aValue: Int64): IFBNumeric;
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150 |
tony |
371 |
begin
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151 |
tony |
381 |
Result := TFBNumeric.CreateFromINT(aValue);
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152 |
tony |
371 |
end;
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153 |
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154 |
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function NumericFromRawValues(aValue: Int64; aScale: integer): IFBNumeric;
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155 |
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begin
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156 |
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Result := TFBNumeric.Create(aValue,aScale);
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157 |
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end;
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158 |
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159 |
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function TryStrToNumeric(S: Ansistring; out Value: int64; out scale: integer): boolean;
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160 |
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var i: integer;
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161 |
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ds: integer;
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162 |
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exponent: integer;
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begin
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164 |
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Result := false;
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ds := 0;
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exponent := 0;
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S := Trim(S);
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168 |
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Value := 0;
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scale := 0;
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if Length(S) = 0 then
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Exit;
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172 |
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{$IF declared(DefaultFormatSettings)}
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with DefaultFormatSettings do
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174 |
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{$ELSE}
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{$IF declared(FormatSettings)}
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with FormatSettings do
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177 |
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{$IFEND}
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178 |
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{$IFEND}
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begin
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180 |
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for i := length(S) downto 1 do
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181 |
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begin
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182 |
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if S[i] = AnsiChar(DecimalSeparator) then
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183 |
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begin
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184 |
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if ds <> 0 then Exit; {only one allowed}
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185 |
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ds := i;
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186 |
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dec(exponent);
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187 |
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system.Delete(S,i,1);
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188 |
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end
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189 |
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else
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190 |
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if S[i] in ['+','-'] then
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191 |
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begin
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192 |
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if (i > 1) and not (S[i-1] in ['e','E']) then
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193 |
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Exit; {malformed}
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194 |
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end
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195 |
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else
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196 |
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if S[i] in ['e','E'] then {scientific notation}
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197 |
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begin
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198 |
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if ds <> 0 then Exit; {not permitted in exponent}
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199 |
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if exponent <> 0 then Exit; {only one allowed}
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200 |
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exponent := i;
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201 |
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end
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202 |
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else
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203 |
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if not (S[i] in ['0'..'9']) then
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204 |
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{Note: ThousandSeparator not allowed by Delphi specs}
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205 |
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Exit; {bad character}
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206 |
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end;
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207 |
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208 |
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if exponent > 0 then
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209 |
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begin
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210 |
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Result := TryStrToInt(system.copy(S,exponent+1,maxint),Scale);
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211 |
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if Result then
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212 |
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begin
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213 |
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{adjust scale for decimal point}
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214 |
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if ds <> 0 then
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215 |
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Scale := Scale - (exponent - ds);
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216 |
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Result := TryStrToInt64(system.copy(S,1,exponent-1),Value);
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217 |
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end;
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218 |
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end
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219 |
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else
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220 |
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begin
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221 |
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if ds > 0 then
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222 |
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begin
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223 |
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{remove trailing zeroes}
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224 |
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while (ds < length(S)) and (S[length(S)] = '0') do {no need to check length as ds > 0}
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225 |
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system.delete(S,Length(S),1);
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226 |
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scale := ds - Length(S) - 1;
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227 |
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end;
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228 |
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Result := TryStrToInt64(S,Value);
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229 |
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end;
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230 |
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end;
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231 |
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end;
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232 |
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233 |
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function NumericToDouble(aValue: Int64; aScale: integer): double;
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234 |
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begin
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235 |
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Result := aValue * IntPower(10,aScale);
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236 |
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end;
|
237 |
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238 |
|
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function SafeSmallInt(aValue: Int64): Smallint;
|
239 |
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begin
|
240 |
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if aValue > High(smallint) then
|
241 |
|
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IBError(ibxeIntegerOverflow,[]);
|
242 |
|
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if aValue < Low(smallint) then
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243 |
|
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IBError(ibxIntegerUnderflow,[]);
|
244 |
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Result := aValue;
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245 |
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end;
|
246 |
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247 |
|
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function SafeInteger(aValue: Int64): integer;
|
248 |
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begin
|
249 |
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if aValue > High(integer) then
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250 |
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IBError(ibxeIntegerOverflow,[]);
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251 |
|
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if aValue < Low(integer) then
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252 |
|
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IBError(ibxIntegerUnderflow,[]);
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253 |
|
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Result := aValue;
|
254 |
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end;
|
255 |
|
|
|
256 |
tony |
381 |
{AdjustScale returns a raw int64 value derived from x but with aNewScale}
|
257 |
tony |
371 |
|
258 |
tony |
381 |
function AdjustScale(x: IFBNumeric; aNewScale: integer): int64;
|
259 |
|
|
var rValue: double;
|
260 |
tony |
371 |
begin
|
261 |
tony |
381 |
rValue := x.getrawValue;
|
262 |
|
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Result := Round(rValue * IntPower(10,x.getScale-aNewScale));
|
263 |
|
|
end;
|
264 |
|
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|
265 |
|
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function CompareInt(a,b: integer): integer;
|
266 |
|
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begin
|
267 |
|
|
if a < b then
|
268 |
|
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Result := -1
|
269 |
tony |
371 |
else
|
270 |
tony |
381 |
if a = b then
|
271 |
|
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Result := 0
|
272 |
tony |
371 |
else
|
273 |
tony |
381 |
Result := 1;
|
274 |
|
|
end;
|
275 |
tony |
371 |
|
276 |
tony |
381 |
function NumericAdd(x, y: IFBNumeric): IFBNumeric;
|
277 |
|
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begin
|
278 |
|
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case CompareInt(x.getScale,y.getScale) of
|
279 |
|
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0:
|
280 |
|
|
Result := NumericFromRawValues(x.getRawValue + y.getRawValue,x.getScale);
|
281 |
|
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1:
|
282 |
|
|
Result := NumericFromRawValues(AdjustScale(x,y.getscale) + y.getRawValue,y.getScale);
|
283 |
|
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else
|
284 |
|
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Result := NumericFromRawValues(AdjustScale(y,x.getscale) + x.getRawValue,x.getScale);
|
285 |
|
|
end;
|
286 |
|
|
end;
|
287 |
|
|
|
288 |
|
|
function NumericSubtract(x, y: IFBNumeric): IFBNumeric;
|
289 |
|
|
begin
|
290 |
|
|
case CompareInt(x.getScale,y.getScale) of
|
291 |
|
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0:
|
292 |
|
|
Result := NumericFromRawValues(x.getRawValue - y.getRawValue,x.getScale);
|
293 |
|
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1:
|
294 |
|
|
Result := NumericFromRawValues(AdjustScale(x,y.getscale) - y.getRawValue,y.getScale);
|
295 |
|
|
else
|
296 |
|
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Result := NumericFromRawValues(AdjustScale(y,x.getscale) - x.getRawValue,x.getScale);
|
297 |
|
|
end;
|
298 |
|
|
end;
|
299 |
|
|
|
300 |
|
|
function NumericMultiply(x, y: IFBNumeric): IFBNumeric;
|
301 |
|
|
begin
|
302 |
|
|
Result := NumericFromRawValues(x.getRawValue * y.getRawValue,x.getScale+y.getScale);
|
303 |
|
|
end;
|
304 |
|
|
|
305 |
|
|
function NumericDivide(x, y: IFBNumeric): IFBNumeric;
|
306 |
|
|
var z: double;
|
307 |
|
|
begin
|
308 |
|
|
{Compute actual value as a double}
|
309 |
|
|
z := (x.getRawValue / y.getRawValue) * IntPower(10, x.getScale - y.getScale);
|
310 |
|
|
{Return numeric at original no. of decimal places of numerator}
|
311 |
|
|
Result := DoubleTONumeric(z).AdjustScaleTo(x.getScale);
|
312 |
|
|
end;
|
313 |
|
|
|
314 |
|
|
function NumericCompare(x, y: IFBNumeric): integer;
|
315 |
|
|
begin
|
316 |
|
|
case CompareInt(x.getScale,y.getScale) of
|
317 |
|
|
0:
|
318 |
|
|
Result := CompareInt(x.getRawValue,y.getRawValue);
|
319 |
|
|
1:
|
320 |
|
|
Result := CompareInt(AdjustScale(x,y.getscale),y.getRawValue);
|
321 |
|
|
else
|
322 |
|
|
Result := CompareInt(x.getRawValue,AdjustScale(y,x.getscale));
|
323 |
|
|
end;
|
324 |
|
|
end;
|
325 |
|
|
|
326 |
|
|
function NegateNumeric(x: IFBNumeric): IFBNumeric;
|
327 |
|
|
begin
|
328 |
|
|
Result := NumericFromRawValues(-x.getRawValue,x.getScale);
|
329 |
|
|
end;
|
330 |
|
|
|
331 |
|
|
function NumericAdd(x: IFBNumeric; y: int64): IFBNumeric;
|
332 |
|
|
begin
|
333 |
|
|
Result := NumericAdd(x,IntToNumeric(y));
|
334 |
|
|
end;
|
335 |
|
|
|
336 |
|
|
function NumericSubtract(x: IFBNumeric; y: int64): IFBNumeric;
|
337 |
|
|
begin
|
338 |
|
|
Result := NumericSubtract(x,IntToNumeric(y));
|
339 |
|
|
end;
|
340 |
|
|
|
341 |
|
|
function NumericSubtract(x: int64; y: IFBNumeric): IFBNumeric;
|
342 |
|
|
begin
|
343 |
|
|
Result := NumericSubtract(IntToNumeric(x),y);
|
344 |
|
|
end;
|
345 |
|
|
|
346 |
|
|
function NumericMultiply(x: IFBNumeric; y: int64): IFBNumeric;
|
347 |
|
|
begin
|
348 |
|
|
Result := NumericMultiply(x,IntToNumeric(y));
|
349 |
|
|
end;
|
350 |
|
|
|
351 |
|
|
function NumericDivide(x: IFBNumeric; y: int64): IFBNumeric;
|
352 |
|
|
begin
|
353 |
|
|
Result := NumericDivide(x,IntToNumeric(y));
|
354 |
|
|
end;
|
355 |
|
|
|
356 |
|
|
function NumericDivide(x: int64; y: IFBNumeric): IFBNumeric;
|
357 |
|
|
begin
|
358 |
|
|
Result := NumericDivide(IntToNumeric(x),y);
|
359 |
|
|
end;
|
360 |
|
|
|
361 |
|
|
function NumericCompare(x: IFBNumeric; y: int64): integer;
|
362 |
|
|
begin
|
363 |
|
|
Result := NumericCompare(x,IntToNumeric(y));
|
364 |
|
|
end;
|
365 |
|
|
|
366 |
|
|
function NumericAdd(x: IFBNumeric; y: double): IFBNumeric;
|
367 |
|
|
begin
|
368 |
|
|
Result := NumericAdd(x,DoubleToNumeric(y));
|
369 |
|
|
end;
|
370 |
|
|
|
371 |
|
|
function NumericSubtract(x: IFBNumeric; y: double): IFBNumeric;
|
372 |
|
|
begin
|
373 |
|
|
Result := NumericSubtract(x,DoubleToNumeric(y));
|
374 |
|
|
end;
|
375 |
|
|
|
376 |
|
|
function NumericSubtract(x: double; y: IFBNumeric): IFBNumeric;
|
377 |
|
|
begin
|
378 |
|
|
Result := NumericSubtract(DoubleToNumeric(x),y);
|
379 |
|
|
end;
|
380 |
|
|
|
381 |
|
|
function NumericMultiply(x: IFBNumeric; y: double): IFBNumeric;
|
382 |
|
|
begin
|
383 |
|
|
Result := NumericMultiply(x,DoubleToNumeric(y));
|
384 |
|
|
end;
|
385 |
|
|
|
386 |
|
|
function NumericDivide(x: IFBNumeric; y: double): IFBNumeric;
|
387 |
|
|
begin
|
388 |
|
|
Result := NumericDivide(x,DoubleToNumeric(y));
|
389 |
|
|
end;
|
390 |
|
|
|
391 |
|
|
function NumericDivide(x: double; y: IFBNumeric): IFBNumeric;
|
392 |
|
|
begin
|
393 |
|
|
Result := NumericDivide(DoubleToNumeric(x),y);
|
394 |
|
|
end;
|
395 |
|
|
|
396 |
|
|
function NumericCompare(x: IFBNumeric; y: double): integer;
|
397 |
|
|
begin
|
398 |
|
|
Result := NumericCompare(x,DoubleToNumeric(y));
|
399 |
|
|
end;
|
400 |
|
|
|
401 |
tony |
371 |
constructor TFBNumeric.Create(aValue: Int64; aScale: integer);
|
402 |
|
|
begin
|
403 |
|
|
inherited Create;
|
404 |
|
|
FValue := aValue;
|
405 |
|
|
FScale := aScale;
|
406 |
|
|
end;
|
407 |
|
|
|
408 |
tony |
381 |
constructor TFBNumeric.CreateFromInt(aValue: Int64);
|
409 |
tony |
371 |
begin
|
410 |
|
|
inherited Create;
|
411 |
|
|
FValue := aValue;
|
412 |
|
|
FScale := 0;
|
413 |
|
|
end;
|
414 |
|
|
|
415 |
tony |
381 |
constructor TFBNumeric.CreateFromStr(aValue: AnsiString);
|
416 |
tony |
371 |
begin
|
417 |
|
|
inherited Create;
|
418 |
|
|
if not TryStrToNumeric(aValue,FValue,FScale) then
|
419 |
|
|
IBError(ibxeInvalidDataConversion,[aValue]);
|
420 |
|
|
end;
|
421 |
|
|
|
422 |
tony |
381 |
constructor TFBNumeric.CreateFromDouble(aValue: double);
|
423 |
|
|
|
424 |
|
|
function WithinLimits(a: double): boolean;
|
425 |
|
|
begin
|
426 |
|
|
a := abs(frac(a));
|
427 |
|
|
Result := (a > 0.001) and (a < 0.999); {avoid small rounding errors converting to decimal}
|
428 |
|
|
end;
|
429 |
|
|
|
430 |
|
|
var aScale: integer;
|
431 |
|
|
i: int64;
|
432 |
tony |
371 |
begin
|
433 |
tony |
381 |
aScale := 0;
|
434 |
|
|
while WithinLimits(AValue) do
|
435 |
tony |
371 |
begin
|
436 |
tony |
381 |
aValue := aValue * 10;
|
437 |
|
|
Inc(aScale);
|
438 |
|
|
end;
|
439 |
|
|
i := Round(aValue);
|
440 |
|
|
Create(i,-aScale);
|
441 |
tony |
371 |
end;
|
442 |
|
|
|
443 |
tony |
381 |
constructor TFBNumeric.CreateFromCurr(aValue: Currency);
|
444 |
tony |
371 |
begin
|
445 |
|
|
inherited Create;
|
446 |
|
|
Move(aValue,FValue,sizeof(Int64));
|
447 |
|
|
FScale := -4;
|
448 |
|
|
end;
|
449 |
|
|
|
450 |
tony |
381 |
constructor TFBNumeric.CreateFromBCD(aValue: TBCD);
|
451 |
tony |
371 |
var ScaledBCD: TBCD;
|
452 |
|
|
begin
|
453 |
|
|
inherited Create;
|
454 |
|
|
FScale := -BCDScale(aValue);
|
455 |
|
|
BCDMultiply(aValue,Power(10,-FScale),ScaledBCD);
|
456 |
|
|
FValue := BCDToInteger(ScaledBCD,true);
|
457 |
|
|
end;
|
458 |
|
|
|
459 |
|
|
function TFBNumeric.getRawValue: Int64;
|
460 |
|
|
begin
|
461 |
|
|
Result := FValue;
|
462 |
|
|
end;
|
463 |
|
|
|
464 |
|
|
function TFBNumeric.getScale: integer;
|
465 |
|
|
begin
|
466 |
|
|
Result := FScale;
|
467 |
|
|
end;
|
468 |
|
|
|
469 |
tony |
381 |
function TFBNumeric.AdjustScaleTo(aNewScale: integer): IFBNumeric;
|
470 |
tony |
371 |
begin
|
471 |
tony |
375 |
if FScale = aNewScale then
|
472 |
|
|
Result := TFBNumeric.Create(FValue,FScale)
|
473 |
|
|
else
|
474 |
tony |
381 |
Result := TFBNumeric.Create(AdjustScale(self,aNewScale),aNewScale);
|
475 |
tony |
371 |
end;
|
476 |
|
|
|
477 |
|
|
function TFBNumeric.getAsString: AnsiString;
|
478 |
|
|
var Scaling : AnsiString;
|
479 |
|
|
i: Integer;
|
480 |
|
|
begin
|
481 |
|
|
Result := IntToStr(FValue);
|
482 |
|
|
Scaling := '';
|
483 |
|
|
if FScale > 0 then
|
484 |
|
|
begin
|
485 |
|
|
for i := 1 to FScale do
|
486 |
|
|
Result := Result + '0';
|
487 |
|
|
end
|
488 |
|
|
else
|
489 |
|
|
if FScale < 0 then
|
490 |
|
|
{$IF declared(DefaultFormatSettings)}
|
491 |
|
|
with DefaultFormatSettings do
|
492 |
|
|
{$ELSE}
|
493 |
|
|
{$IF declared(FormatSettings)}
|
494 |
|
|
with FormatSettings do
|
495 |
|
|
{$IFEND}
|
496 |
|
|
{$IFEND}
|
497 |
|
|
begin
|
498 |
|
|
if Length(Result) > -FScale then
|
499 |
|
|
system.Insert(DecimalSeparator,Result,Length(Result) + FScale+1)
|
500 |
|
|
else
|
501 |
|
|
begin
|
502 |
|
|
Scaling := '0' + DecimalSeparator;
|
503 |
|
|
for i := -1 downto FScale + Length(Result) do
|
504 |
|
|
Scaling := Scaling + '0';
|
505 |
|
|
if FValue < 0 then
|
506 |
|
|
system.insert(Scaling,Result,2)
|
507 |
|
|
else
|
508 |
|
|
Result := Scaling + Result;
|
509 |
|
|
end;
|
510 |
|
|
end;
|
511 |
|
|
end;
|
512 |
|
|
|
513 |
|
|
function TFBNumeric.getAsDouble: double;
|
514 |
|
|
begin
|
515 |
|
|
Result := NumericToDouble(FValue,FScale);
|
516 |
|
|
end;
|
517 |
|
|
|
518 |
|
|
function TFBNumeric.getAsCurrency: Currency;
|
519 |
|
|
var value: int64;
|
520 |
|
|
begin
|
521 |
|
|
if FScale <> -4 then
|
522 |
|
|
begin
|
523 |
tony |
381 |
value := AdjustScaleTo(-4).GetRawValue;
|
524 |
tony |
371 |
Move(value,Result,sizeof(Currency));
|
525 |
tony |
375 |
end
|
526 |
tony |
371 |
else
|
527 |
|
|
Move(FValue,Result,sizeof(Currency));
|
528 |
|
|
end;
|
529 |
|
|
|
530 |
|
|
function TFBNumeric.getAsBCD: TBCD;
|
531 |
|
|
begin
|
532 |
|
|
Result := DoubleToBCD(getAsDouble);
|
533 |
|
|
end;
|
534 |
|
|
|
535 |
|
|
function TFBNumeric.getAsInt64: Int64;
|
536 |
|
|
var
|
537 |
|
|
Scaling : Int64;
|
538 |
|
|
i: Integer;
|
539 |
|
|
Val: Int64;
|
540 |
|
|
begin
|
541 |
|
|
Scaling := 1;
|
542 |
|
|
Val := FValue;
|
543 |
|
|
if FScale > 0 then begin
|
544 |
|
|
for i := 1 to FScale do Scaling := Scaling * 10;
|
545 |
|
|
result := Val * Scaling;
|
546 |
|
|
end else if FScale < 0 then begin
|
547 |
|
|
for i := -1 downto FScale do Scaling := Scaling * 10;
|
548 |
|
|
result := Val div Scaling;
|
549 |
|
|
end else
|
550 |
|
|
result := Val;
|
551 |
|
|
end;
|
552 |
|
|
|
553 |
|
|
function TFBNumeric.getAsInteger: integer;
|
554 |
|
|
begin
|
555 |
|
|
Result := SafeInteger(getAsInt64);
|
556 |
|
|
end;
|
557 |
|
|
|
558 |
|
|
function TFBNumeric.getAsSmallInt: SmallInt;
|
559 |
|
|
begin
|
560 |
|
|
Result := SafeSmallInt(getAsInt64);
|
561 |
|
|
end;
|
562 |
|
|
|
563 |
|
|
end.
|
564 |
|
|
|