510 lines
17 KiB
ObjectPascal
510 lines
17 KiB
ObjectPascal
unit uDAMacroProcessors;
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{----------------------------------------------------------------------------}
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{ Data Abstract Library - Core Library }
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{ }
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{ compiler: Delphi 6 and up, Kylix 3 and up }
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{ platform: Win32, Linux }
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{ }
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{ (c)opyright RemObjects Software. all rights reserved. }
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{ }
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{ Using this code requires a valid license of the Data Abstract }
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{ which can be obtained at http://www.remobjects.com. }
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{----------------------------------------------------------------------------}
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{$I DataAbstract.inc}
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interface
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uses uDAEngine;
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(*
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Macros:
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-------------------- Date --------------------
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Returns the current date from the server
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Syntax: {Date()}
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Example: SELECT * FROM Table WHERE OrderDate>{Date()}
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Parameters: this macro has no parameters
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-------------------- Time --------------------
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Returns the current time from the server
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Syntax: {Time()}
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Example: SELECT * FROM Table WHERE OrderDate>{Time()}
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Parameters: this macro has no parameters
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-------------------- DateTime --------------------
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Returns the current datetime from the server
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Syntax: {DateTime()}
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Example: SELECT * FROM Table WHERE OrderDate>{DateTime()}
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Parameters: this macro has no parameters
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-------------------- AddTime --------------------
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Returns a new datetime value based on adding an interval to the specified date.
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Not all databases support this macro.
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Syntax: {AddTime(<date>, <interval>, <interval_type>)}
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Example: SELECT * FROM Table WHERE OrderDate>{AddTime(Date(), 2, day)}
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Parameters: <date>: a valid date
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<interval>: number of days, weeks, etc as per next parameter
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<interval_type>: day, week, year, hour, min, sec
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-------------------- FormatDateTime --------------------
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Formats the specified datetime to the datetime format used by the database
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Syntax: {FormatDateTime(<date>)}
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Example: SELECT * FROM Table WHERE OrderDate>{FormatDateTime('12/22/2003 15:22:34.123')}
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Parameters: <date>: a string expression representing a data in format MM/DD/YYYY HH24:MM:SS.MS
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-------------------- FormatDate --------------------
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Formats the specified date to the date format used by the database
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Syntax: {FormatDateTime(<date>)}
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Example: SELECT * FROM Table WHERE OrderDate>{FormatDate('12/22/2003')}
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Parameters: <date>: a string expression representing a data in format MM/DD/YYYY
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-------------------- Length --------------------
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Returns the length of the given string
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Syntax: {Length(<string>)}
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Example: SELECT * FROM Table WHERE {Length(CustomerID)}>3
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Parameters: <string>: a text string
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-------------------- LowerCase --------------------
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Converts the given string to lower case
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Syntax: {LowerCase(<string>)}
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Example: SELECT * FROM Table WHERE {LowerCase(CustomerID)}='alfki'
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Parameters: <string>: a text string
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-------------------- UpperCase --------------------
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Converts the given string to upper case
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Syntax: {UpperCase(<string>)}
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Example: SELECT * FROM Table WHERE {UpperCase(CustomerID)}='ALFKI'
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Parameters: <string>: a text string
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-------------------- TrimLeft --------------------
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Removes the leading spaces from a string
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Syntax: {TrimLeft(<string>)}
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Example: SELECT * FROM Table WHERE {TrimLeft(CustomerID)}='ALFKI'
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Parameters: <string>: a text string
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-------------------- TrimRight --------------------
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Removes the trailing spaces from a string
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Syntax: {TrimRight(<string>)}
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Example: SELECT * FROM Table WHERE {TrimRight(CustomerID)}='ALFKI'
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Parameters: <string>: a text string
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-------------------- Copy --------------------
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Returns <count> characters starting from <index> from <string>
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Syntax: {Copy(<string>, <index>, <count>)}
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Example: SELECT * FROM Table WHERE OrderDate>{Date()}
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Parameters:
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<string>: a field name or a string
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<index>: the position from where to start copying
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<count>: the number of characters to copy
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-------------------- NoLockHint --------------------
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Returns (NOLOCK) for MSSQL server and empty string for other databases
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Syntax: {NoLockHint}
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Example: SELECT * FROM Table {NoLockHint}
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*)
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type { TDAMSSQLMacroProcessor }
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TDAMSSQLMacroProcessor = class(TDASQLMacroProcessor)
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protected
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function DateTime(Sender: TObject; const Parameters: array of string): string; override;
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function AddTime(Sender: TObject; const Parameters: array of string): string; override;
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function Length(Sender: TObject; const Parameters: array of string): string; override;
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function LowerCase(Sender: TObject; const Parameters: array of string): string; override;
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function UpperCase(Sender: TObject; const Parameters: array of string): string; override;
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function TrimLeft(Sender: TObject; const Parameters: array of string): string; override;
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function TrimRight(Sender: TObject; const Parameters: array of string): string; override;
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function Copy(Sender: TObject; const Parameters: array of string): string; override;
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function Nolock(Sender: TObject; const Parameters: array of string): string; override;
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public
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constructor Create;
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end;
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TMSSQLMacroProcessor = TDAMSSQLMacroProcessor;
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{ TDAIBMacroProcessor }
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TDAIBMacroProcessor = class(TDASQLMacroProcessor)
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protected
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function DateTime(Sender: TObject; const Parameters: array of string): string; override;
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function AddTime(Sender: TObject; const Parameters: array of string): string; override;
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function Length(Sender: TObject; const Parameters: array of string): string; override;
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function LowerCase(Sender: TObject; const Parameters: array of string): string; override;
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function UpperCase(Sender: TObject; const Parameters: array of string): string; override;
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function TrimLeft(Sender: TObject; const Parameters: array of string): string; override;
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function TrimRight(Sender: TObject; const Parameters: array of string): string; override;
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function Copy(Sender: TObject; const Parameters: array of string): string; override;
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function Nolock(Sender: TObject; const Parameters: array of string): string; override;
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public
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constructor Create;
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end;
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TIBMacroProcessor = TDAIBMacroProcessor;
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{ TDAOracleMacroProcessor }
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TDAOracleMacroProcessor = class(TDASQLMacroProcessor)
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function DateTime(Sender: TObject; const Parameters: array of string): string; override;
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function AddTime(Sender: TObject; const Parameters: array of string): string; override;
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function Length(Sender: TObject; const Parameters: array of string): string; override;
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function LowerCase(Sender: TObject; const Parameters: array of string): string; override;
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function UpperCase(Sender: TObject; const Parameters: array of string): string; override;
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function TrimLeft(Sender: TObject; const Parameters: array of string): string; override;
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function TrimRight(Sender: TObject; const Parameters: array of string): string; override;
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function Copy(Sender: TObject; const Parameters: array of string): string; override;
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function FormatDate(Sender: TObject; const Parameters: array of string): string; override;
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function FormatDateTime(Sender: TObject; const Parameters: array of string): string; override;
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function Nolock(Sender: TObject; const Parameters: array of string): string; override;
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public
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constructor Create;
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end;
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TOracleMacroProcessor = TDAOracleMacroProcessor;
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{ TDADBISAMMacroProcessor }
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TDADBISAMMacroProcessor = class(TDASQLMacroProcessor)
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function DateTime(Sender: TObject; const Parameters: array of string): string; override;
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function AddTime(Sender: TObject; const Parameters: array of string): string; override;
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function Length(Sender: TObject; const Parameters: array of string): string; override;
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function LowerCase(Sender: TObject; const Parameters: array of string): string; override;
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function UpperCase(Sender: TObject; const Parameters: array of string): string; override;
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function TrimLeft(Sender: TObject; const Parameters: array of string): string; override;
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function TrimRight(Sender: TObject; const Parameters: array of string): string; override;
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function Copy(Sender: TObject; const Parameters: array of string): string; override;
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function Nolock(Sender: TObject; const Parameters: array of string): string; override;
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public
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constructor Create;
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end;
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TDBISAMMacroProcessor = TDADBISAMMacroProcessor;
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implementation
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uses SysUtils;
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{ TDAMSSQLMacroProcessor }
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constructor TDAMSSQLMacroProcessor.Create;
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begin
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inherited Create('yyyy-mm-dd', 'yyyy-mm-dd hh:nn:ss.zzz', FALSE, '@');
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end;
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function TDAMSSQLMacroProcessor.AddTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('dateadd(%s, %s, %s)', [Parameters[2], Parameters[1], Parameters[0]]);
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end;
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function TDAMSSQLMacroProcessor.Copy(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('substring(%s, %s, %s)', [Parameters[0], Parameters[1], Parameters[2]]);
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end;
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function TDAMSSQLMacroProcessor.DateTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'GetDate()';
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end;
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function TDAMSSQLMacroProcessor.Length(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'len(' + Parameters[0] + ')'
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end;
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function TDAMSSQLMacroProcessor.LowerCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'lower(' + Parameters[0] + ')'
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end;
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function TDAMSSQLMacroProcessor.TrimLeft(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'ltrim(' + Parameters[0] + ')'
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end;
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function TDAMSSQLMacroProcessor.TrimRight(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'rtrim(' + Parameters[0] + ')'
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end;
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function TDAMSSQLMacroProcessor.UpperCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'upper(' + Parameters[0] + ')'
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end;
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function TDAMSSQLMacroProcessor.Nolock(Sender: TObject; const Parameters: array of string): string;
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begin
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result := ' (NOLOCK) ';
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end;
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{ TDAIBMacroProcessor }
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constructor TDAIBMacroProcessor.Create;
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begin
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inherited Create('yyyy-mm-dd', 'yyyy-mm-dd hh:mm:ss.zzz', FALSE);
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end;
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function TDAIBMacroProcessor.AddTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := '???'
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end;
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function TDAIBMacroProcessor.Copy(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('substring(%s from %s for %s)', [Parameters[0], Parameters[1], Parameters[2]]);
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end;
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function TDAIBMacroProcessor.DateTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := '(select current_timestamp from rdb$database)';
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end;
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function TDAIBMacroProcessor.Length(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('char_length(%s)', [Parameters[0]]);
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end;
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function TDAIBMacroProcessor.LowerCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'lower(' + Parameters[0] + ')'
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end;
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function TDAIBMacroProcessor.TrimLeft(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'trim ( leading from ' + Parameters[0] + ')'
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end;
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function TDAIBMacroProcessor.TrimRight(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'trim ( trailing from ' + Parameters[0] + ')'
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end;
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function TDAIBMacroProcessor.UpperCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'upper(' + Parameters[0] + ')'
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end;
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function TDAIBMacroProcessor.Nolock(Sender: TObject; const Parameters: array of string): string;
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begin
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result := '';
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end;
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{ TDAOracleMacroProcessor }
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constructor TDAOracleMacroProcessor.Create;
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begin
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inherited Create('MM/DD/YYYY', 'MM/DD/YYYY HH:MM:SS.ZZZ', FALSE);
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end;
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function TDAOracleMacroProcessor.FormatDate(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := StringReplace('TO_DATE(''' + Parameters[0] + ''', ''MM/DD/YYYY'')', '''''', '''', [rfReplaceAll]);
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end;
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function TDAOracleMacroProcessor.FormatDateTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := StringReplace('TO_DATE(''' + Parameters[0] + ''', ''MM/DD/YYYY HH24:MI:SS.FF3'')', '''''', '''', [rfReplaceAll]);
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end;
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function TDAOracleMacroProcessor.AddTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Parameters[0] + '+';
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if SameText(Parameters[2], 'DAY') then
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result := result + Parameters[1]
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else if SameText(Parameters[2], 'WEEK') then
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result := result + Parameters[1] + '*7'
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else if SameText(Parameters[2], 'YEAR') then
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result := result + Parameters[1] + '*365'
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else if SameText(Parameters[2], 'HOUR') then
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result := result + Parameters[1] + '/24'
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else if SameText(Parameters[2], 'MIN') then
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result := result + Parameters[1] + '/1440'
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else if SameText(Parameters[2], 'SEC') then
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result := result + Parameters[1] + '/86400';
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end;
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function TDAOracleMacroProcessor.Copy(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('SUBSTR(%s, %s, %s)', [Parameters[0], Parameters[1], Parameters[2]]);
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end;
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function TDAOracleMacroProcessor.DateTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'SYSDATE'
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end;
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function TDAOracleMacroProcessor.Length(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('LENGTH(%s)', [Parameters[0]]);
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end;
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function TDAOracleMacroProcessor.LowerCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('LOWER(%s)', [Parameters[0]]);
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end;
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function TDAOracleMacroProcessor.TrimLeft(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('TRIM(%s)', [Parameters[0]]);
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end;
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function TDAOracleMacroProcessor.TrimRight(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('TRIM(%s)', [Parameters[0]]);
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end;
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function TDAOracleMacroProcessor.UpperCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('UPPER(%s)', [Parameters[0]]);
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end;
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function TDAOracleMacroProcessor.Nolock(Sender: TObject; const Parameters: array of string): string;
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begin
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result := '';
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end;
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{ TDADBISAMMacroProcessor }
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constructor TDADBISAMMacroProcessor.Create;
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begin
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inherited Create('MM/DD/YYYY', 'MM/DD/YYYY HH:MM:SS.ZZZ', FALSE);
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end;
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function TDADBISAMMacroProcessor.AddTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Parameters[0] + '+';
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if SameText(Parameters[2], 'DAY') then
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result := result + Parameters[1]
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else if SameText(Parameters[2], 'WEEK') then
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result := result + Parameters[1] + '*7'
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else if SameText(Parameters[2], 'YEAR') then
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result := result + Parameters[1] + '*365'
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else if SameText(Parameters[2], 'HOUR') then
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result := result + Parameters[1] + '/24'
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else if SameText(Parameters[2], 'MIN') then
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result := result + Parameters[1] + '/1440'
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else if SameText(Parameters[2], 'SEC') then
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result := result + Parameters[1] + '/86400';
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end;
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function TDADBISAMMacroProcessor.Copy(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('SUBSTRING(%s FROM %s FOR %s)', [Parameters[0], Parameters[1], Parameters[2]]);
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end;
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function TDADBISAMMacroProcessor.DateTime(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := 'CURRENT_TIMESTAMP'
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end;
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function TDADBISAMMacroProcessor.Length(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('LENGTH(%s)', [Parameters[0]]);
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end;
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function TDADBISAMMacroProcessor.LowerCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('LOWER(%s)', [Parameters[0]]);
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end;
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function TDADBISAMMacroProcessor.TrimLeft(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('TRIM(LEADING '' '' FROM %s)', [Parameters[0]]);
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end;
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function TDADBISAMMacroProcessor.TrimRight(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('TRIM(TRAILING '' '' FROM %s)', [Parameters[0]]);
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end;
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function TDADBISAMMacroProcessor.UpperCase(Sender: TObject;
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const Parameters: array of string): string;
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begin
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result := Format('UPPER(%s)', [Parameters[0]]);
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end;
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function TDADBISAMMacroProcessor.Nolock(Sender: TObject; const Parameters: array of string): string;
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begin
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result := '';
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end;
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end.
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