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Comparing ibx/trunk/fbintf/IBUtils.pas (file contents):
Revision 47 by tony, Mon Jan 9 15:31:51 2017 UTC vs.
Revision 118 by tony, Mon Jan 22 13:58:14 2018 UTC

# Line 32 | Line 32
32   {************************************************************************}
33  
34   unit IBUtils;
35 + {$IFDEF MSWINDOWS}
36 + {$DEFINE WINDOWS}
37 + {$IF CompilerVersion >= 28}
38 + {Delphi XE7 onwards}}
39 + {$define HASREQEX}
40 + {$IFEND}
41 + {$ENDIF}
42  
43   {$IFDEF FPC}
44   {$Mode Delphi}
45   {$codepage UTF8}
46 + {$define HASREQEX}
47   {$ENDIF}
48  
49 +
50   interface
51  
52 < uses
44 < {$IFDEF WINDOWS }
45 <  Windows,
46 < {$ELSE}
47 <  unix,
48 < {$ENDIF}
49 <  Classes, SysUtils;
52 > uses Classes, SysUtils;
53  
54   const
55    CRLF = #13 + #10;
# Line 258 | Line 261 | const
261  
262   function Max(n1, n2: Integer): Integer;
263   function Min(n1, n2: Integer): Integer;
264 < function RandomString(iLength: Integer): String;
264 > function RandomString(iLength: Integer): AnsiString;
265   function RandomInteger(iLow, iHigh: Integer): Integer;
266 < function StripString(st: String; CharsToStrip: String): String;
267 < function FormatIdentifier(Dialect: Integer; Value: String): String;
268 < function FormatIdentifierValue(Dialect: Integer; Value: String): String;
269 < function FormatIdentifierValueNC(Dialect: Integer; Value: String): String;
270 < function ExtractIdentifier(Dialect: Integer; Value: String): String;
271 < function QuoteIdentifier(Dialect: Integer; Value: String): String;
272 < function QuoteIdentifierIfNeeded(Dialect: Integer; Value: String): String;
273 < function Space2Underscore(s: string): string;
271 < function SQLSafeString(const s: string): string;
266 > function StripString(st: AnsiString; CharsToStrip: AnsiString): AnsiString;
267 > function ExtractIdentifier(Dialect: Integer; Value: AnsiString): AnsiString;
268 > function QuoteIdentifier(Dialect: Integer; Value: AnsiString): AnsiString;
269 > function QuoteIdentifierIfNeeded(Dialect: Integer; Value: AnsiString): AnsiString;
270 > function Space2Underscore(s: AnsiString): AnsiString;
271 > function SQLSafeString(const s: AnsiString): AnsiString;
272 > function IsSQLIdentifier(Value: AnsiString): boolean;
273 > function ExtractConnectString(const CreateSQL: AnsiString; var ConnectString: AnsiString): boolean;
274  
275   implementation
276  
277 + {$IFDEF HASREQEX}
278 + uses RegExpr;
279 + {$ENDIF}
280 +
281   function Max(n1, n2: Integer): Integer;
282   begin
283    if (n1 > n2) then
# Line 288 | Line 294 | begin
294      result := n2;
295   end;
296  
297 < function RandomString(iLength: Integer): String;
297 > function RandomString(iLength: Integer): AnsiString;
298   begin
299    result := '';
300    while Length(result) < iLength do
# Line 302 | Line 308 | begin
308    result := Trunc(Random(iHigh - iLow)) + iLow;
309   end;
310  
311 < function StripString(st: String; CharsToStrip: String): String;
311 > function StripString(st: AnsiString; CharsToStrip: AnsiString): AnsiString;
312   var
313    i: Integer;
314   begin
# Line 313 | Line 319 | begin
319    end;
320   end;
321  
322 < function FormatIdentifier(Dialect: Integer; Value: String): String;
317 < begin
318 <  Value := Trim(Value);
319 <  if Dialect = 1 then
320 <    Value := AnsiUpperCase(Value)
321 <  else
322 <    if (Value <> '') and (Value[1] = '"') then
323 <      Value := '"' + StringReplace (TrimRight(Value), '"', '""', [rfReplaceAll]) + '"'
324 <    else
325 <      Value := AnsiUpperCase(Value);
326 <  Result := Value;
327 < end;
322 > {Extracts SQL Identifier typically from a  Dialect 3 encoding}
323  
324 < function FormatIdentifierValue(Dialect: Integer; Value: String): String;
324 > function ExtractIdentifier(Dialect: Integer; Value: AnsiString): AnsiString;
325   begin
326    Value := Trim(Value);
327    if Dialect = 1 then
# Line 345 | Line 340 | begin
340    Result := Value;
341   end;
342  
343 < function FormatIdentifierValueNC(Dialect: Integer; Value: String): String;
349 < begin
350 <  Value := Trim(Value);
351 <  if Dialect = 1 then
352 <    Value := AnsiUpperCase(Value)
353 <  else
354 <  begin
355 <    if (Value <> '') and (Value[1] = '"') then
356 <    begin
357 <      Delete(Value, 1, 1);
358 <      Delete(Value, Length(Value), 1);
359 <      Value := AnsiUpperCase(StringReplace (Value, '""', '"', [rfReplaceAll]));
360 <    end
361 <    else
362 <      Value := AnsiUpperCase(Value);
363 <  end;
364 <  Result := Value;
365 < end;
343 > {Returns true if "w" is a Firebird SQL reserved word}
344  
345 < function ExtractIdentifier(Dialect: Integer; Value: String): String;
368 < begin
369 <  Value := Trim(Value);
370 <  if Dialect = 1 then
371 <    Value := AnsiUpperCase(Value)
372 <  else
373 <  begin
374 <    if (Value <> '') and (Value[1] = '"') then
375 <    begin
376 <      Delete(Value, 1, 1);
377 <      Delete(Value, Length(Value), 1);
378 <      Value := StringReplace (Value, '""', '"', [rfReplaceAll]);
379 <    end
380 <    else
381 <      Value := AnsiUpperCase(Value);
382 <  end;
383 <  Result := Value;
384 < end;
385 <
386 < function IsReservedWord(w: string): boolean;
345 > function IsReservedWord(w: AnsiString): boolean;
346   var i: integer;
347   begin
348       Result := true;
# Line 393 | Line 352 | begin
352       Result := false;
353   end;
354  
355 < function QuoteIdentifier(Dialect: Integer; Value: String): String;
355 > {Format an SQL Identifier according to SQL Dialect}
356 >
357 > function QuoteIdentifier(Dialect: Integer; Value: AnsiString): AnsiString;
358   begin
359    if Dialect = 1 then
360      Value := AnsiUpperCase(Trim(Value))
361    else
362 <    Value := '"' + Value + '"';
362 >    Value := '"' + StringReplace (Value, '""', '"', [rfReplaceAll]) + '"';
363    Result := Value;
364   end;
365  
366 < function QuoteIdentifierIfNeeded(Dialect: Integer; Value: String): String;
366 > const
367 >  ValidSQLIdentifierChars = ['A'..'Z','a'..'z','0'..'9','_','$'];
368 >
369 > {Returns true if the value is a valid SQL Identifier - note lower case accepted}
370 >
371 > function IsSQLIdentifier(Value: AnsiString): boolean;
372 > var i: integer;
373 > begin
374 >  Result := false;
375 >  for i := 1 to Length(Value) do
376 >    if not (Value[i] in ValidSQLIdentifierChars) then Exit;
377 >  Result := true;
378 > end;
379 >
380 > {Extracts the Database Connect string from a Create Database Statement}
381 >
382 > {$IFDEF HASREQEX}
383 > function ExtractConnectString(const CreateSQL: AnsiString;
384 >  var ConnectString: AnsiString): boolean;
385 > var RegexObj: TRegExpr;
386 > begin
387 >  RegexObj := TRegExpr.Create;
388 >  try
389 >    {extact database file spec}
390 >    RegexObj.ModifierG := false; {turn off greedy matches}
391 >    RegexObj.ModifierI := true; {case insensitive match}
392 >    RegexObj.Expression := '^ *CREATE +(DATABASE|SCHEMA) +''(.*)''';
393 >    Result := RegexObj.Exec(CreateSQL);
394 >    if Result then
395 >      ConnectString := system.copy(CreateSQL,RegexObj.MatchPos[2],RegexObj.MatchLen[2]);
396 >  finally
397 >    RegexObj.Free;
398 >  end;
399 > end;
400 > {$ELSE}
401 > {cruder version of above for old versions of Delphi}
402 > function ExtractConnectString(const CreateSQL: AnsiString;
403 >  var ConnectString: AnsiString): boolean;
404 > var i: integer;
405 > begin
406 >  Result := false;
407 >  i := Pos('''',CreateSQL);
408 >  if i > 0 then
409 >  begin
410 >    ConnectString := CreateSQL;
411 >    delete(ConnectString,1,i);
412 >    i := Pos('''',ConnectString);
413 >    if i > 0 then
414 >    begin
415 >      delete(ConnectString,i,Length(ConnectString)-i+1);
416 >      Result := true;
417 >    end;
418 >  end;
419 > end;
420 > {$ENDIF}
421 >
422 > {Format an SQL Identifier according to SQL Dialect with encapsulation if necessary}
423 >
424 > function QuoteIdentifierIfNeeded(Dialect: Integer; Value: AnsiString): AnsiString;
425   begin
426    if (Dialect = 3) and
427 <    ((AnsiUpperCase(Value) <> Value) or IsReservedWord(Value)) then
428 <     Result := '"' + Value + '"'
427 >    (IsReservedWord(Value) or not IsSQLIdentifier(Value) or (AnsiUpperCase(Value) <> Value)) then
428 >     Result := '"' + StringReplace (TrimRight(Value), '"', '""', [rfReplaceAll]) + '"'
429    else
430      Result := Value
431   end;
432  
433 < function Space2Underscore(s: string): string;
433 > {Replaces unknown characters in a string with underscores}
434 >
435 > function Space2Underscore(s: AnsiString): AnsiString;
436   var
437     k: integer;
438   begin
439       Result := s;
440       for k := 1 to Length(s) do
441 <         if not (Result[k] in ['0'..'9','A'..'Z','_','$'])  then
441 >         if not (Result[k] in ValidSQLIdentifierChars)  then
442              Result[k] := '_';
443   end;
444  
445 < function SQLSafeString(const s: string): string;
445 > {Reformats an SQL string with single quotes duplicated.}
446 >
447 > function SQLSafeString(const s: AnsiString): AnsiString;
448   begin
449    Result := StringReplace(s,'''','''''',[rfReplaceAll]);
450   end;

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