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{
This file is part of the Free Pascal run time library.
Copyright (c) 2008 by the Free Pascal development team
Abstract SQL scripting engine.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit SQLScript;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
Const
MinSQLSeps = 5; // Default, minimum number of standard SQL separators.
type
TSQLScriptStatementEvent = procedure(Sender: TObject; Statement: TStrings; var StopExecution: Boolean) of object;
TSQLScriptDirectiveEvent = procedure(Sender: TObject; Directive, Argument: AnsiString; var StopExecution: Boolean) of object;
TSQLScriptExceptionEvent = procedure(Sender: TObject; Statement: TStrings; TheException: Exception; var Continue: boolean) of object;
TSQLSkipMode = (smNone, smIfBranch, smElseBranch, smAll);
{ TCustomSQLScript }
TCustomSQLScript = class(TComponent)
private
FAutoCommit: Boolean;
FDollarStrings: Tstrings;
FLine: Integer;
FCol: Integer;
FDefines: TStrings;
FOnException: TSQLScriptExceptionEvent;
FSkipMode: TSQLSkipMode;
FIsSkipping: Boolean;
FSkipStackIndex: Integer;
FSkipModeStack: array[0..255] of TSQLSkipMode;
FIsSkippingStack: array[0..255] of Boolean;
FAborted: Boolean;
FUseDollarString: Boolean;
FUseSetTerm, FUseDefines, FUseCommit,
FCommentsInSQL: Boolean;
FTerminator: AnsiString;
FSQL: TStrings;
FCurrentStripped,
FCurrentStatement: TStrings;
FDirectives: TStrings;
FComment,
FEmitLine: Boolean;
FSeps : Array of string;
procedure SetDefines(const Value: TStrings);
function FindNextSeparator(ASeps: Array of string; Out IsExtended : Boolean): AnsiString;
procedure AddToStatement(value: AnsiString; ForceNewLine : boolean);
procedure SetDirectives(value: TStrings);
procedure SetDollarStrings(AValue: TStrings);
procedure SetSQL(value: TStrings);
procedure SetTerminator(AValue: AnsiString);
procedure SetUseDollarString(AValue: Boolean);
procedure SQLChange(Sender: TObject);
procedure DollarStringsChange(Sender : TObject);
Procedure RecalcSeps;
function GetLine: Integer;
protected
procedure ClearStatement; virtual;
procedure InternalStatement (Statement: TStrings; var StopExecution: Boolean); virtual;
procedure InternalDirective (Directive, Argument: String; var StopExecution: Boolean); virtual;
// Runs commit. If ComitRetaining, use CommitRetraining if possible, else stop/starttransaction
procedure InternalCommit(CommitRetaining: boolean=true); virtual;
Function ProcessConditional(Directive : String; Param : String) : Boolean; virtual;
function NextStatement: AnsiString; virtual;
procedure ProcessStatement; virtual;
function Available: Boolean; virtual;
procedure DefaultDirectives; virtual;
procedure ExecuteStatement (Statement: TStrings; var StopExecution: Boolean); virtual; abstract;
procedure ExecuteDirective (Directive, Argument: String; var StopExecution: Boolean); virtual; abstract;
// Executes commit. If possible and CommitRetaining, use CommitRetaining, else
procedure ExecuteCommit(CommitRetaining: boolean=true); virtual; abstract;
public
constructor Create (AnOwner: TComponent); override;
destructor Destroy; override;
procedure Execute; virtual;
protected
property Aborted: Boolean read FAborted;
property Line: Integer read GetLine;
Property AutoCommit : Boolean Read FAutoCommit Write FAutoCommit default false;
property CommentsInSQL: Boolean read FCommentsInSQL write FCommentsInSQL default true;
property UseSetTerm: Boolean read FUseSetTerm write FUseSetTerm default true;
property UseCommit: Boolean read FUseCommit write FUseCommit Default true;
property UseDefines: Boolean read FUseDefines write FUseDefines default true;
Property UseDollarString : Boolean Read FUseDollarString Write SetUseDollarString default false;
Property DollarStrings : TStrings Read FDollarStrings Write SetDollarStrings;
property Defines : TStrings Read FDefines Write SetDefines;
property Directives: TStrings read FDirectives write SetDirectives;
property Script: TStrings read FSQL write SetSQL; // script to execute
property Terminator: AnsiString read FTerminator write SetTerminator;
property OnException : TSQLScriptExceptionEvent read FOnException write FOnException;
end;
{ TEventSQLScript }
TEventSQLScript = class (TCustomSQLScript)
private
FAfterExec: TNotifyEvent;
FBeforeExec: TNotifyEvent;
FOnCommit: TNotifyEvent;
FOnSQLStatement: TSQLScriptStatementEvent;
FOnDirective: TSQLScriptDirectiveEvent;
protected
procedure ExecuteStatement (SQLStatement: TStrings; var StopExecution: Boolean); override;
procedure ExecuteDirective (Directive, Argument: String; var StopExecution: Boolean); override;
procedure ExecuteCommit(CommitRetaining: boolean=true); override;
public
procedure Execute; override;
property Aborted;
property Line;
published
Property UseDollarString;
Property DollarStrings;
property Directives;
property Defines;
property Script;
property Terminator;
property CommentsinSQL;
property UseSetTerm;
property UseCommit;
property UseDefines;
property OnException;
property OnSQLStatement: TSQLScriptStatementEvent read FOnSQLStatement write FOnSQLStatement;
property OnDirective: TSQLScriptDirectiveEvent read FOnDirective write FOnDirective;
property OnCommit: TNotifyEvent read FOnCommit write FOnCommit;
property BeforeExecute : TNotifyEvent read FBeforeExec write FBeforeExec;
property AfterExecute : TNotifyEvent read FAfterExec write FAfterExec;
end;
ESQLScript = Class(Exception);
implementation
Resourcestring
SErrIfXXXNestingLimitReached = '#IFDEF nesting limit reached';
SErrInvalidEndif = '#ENDIF without #IFDEF';
SErrInvalidElse = '#ELSE without #IFDEF';
{ ---------------------------------------------------------------------
Auxiliary Functions
---------------------------------------------------------------------}
function StartsWith(S1, S2: AnsiString): Boolean;
var
L1,L2 : Integer;
begin
Result:=False;
L1:=Length(S1);
L2:=Length(S2);
if (L2=0) or (L1<L2) then
Exit;
Result:=(AnsiCompareStr(Copy(s1,1,L2),S2)=0);
Result := Result and ((L2 = L1) or (s1[L2+1] = ' '));
end;
function GetFirstSeparator(S: AnsiString; Sep: array of string): integer;
var
i, C, M: Integer;
begin
M:=length(S) + 1;
Result:=-1;
for i:=0 to high(Sep) do
begin
C:=Pos(Sep[i],S);
if (C<>0) and (C<M) then
begin
M:=C;
Result:=i;
end;
end;
end;
Function ConvertWhiteSpace(S : String) : String;
begin
Result:=StringReplace(S,#13,' ',[rfReplaceAll]);
Result:=StringReplace(Result,#10,' ',[rfReplaceAll]);
Result:=Trim(Result);
end;
{ ---------------------------------------------------------------------
TSQLScript
---------------------------------------------------------------------}
procedure TCustomSQLScript.SQLChange(Sender: TObject);
begin
FLine:=1;
FCol:=1;
end;
procedure TCustomSQLScript.DollarStringsChange(Sender: TObject);
begin
RecalcSeps;
end;
procedure TCustomSQLScript.RecalcSeps;
Var
L : Integer;
begin
L:=MinSQLSeps;
If UseDollarString then
L:=L+1+DollarStrings.Count;
SetLength(FSeps,L);
FSeps[0]:=FTerminator;
FSeps[1]:='/*';
FSeps[2]:='"';
FSeps[3]:='''';
FSeps[4]:='--';
If UseDollarString then
begin
FSeps[MinSQLSeps]:='$$';
For L:=0 to FDollarStrings.Count-1 do
FSeps[MinSQLSeps+1+L]:='$'+FDollarStrings[L]+'$';
end;
end;
procedure TCustomSQLScript.SetDirectives(value: TStrings);
var
i : Integer;
S : AnsiString;
begin
FDirectives.Clear();
if (Value<>Nil) then
begin
for i:=0 to value.Count - 1 do
begin
S:=UpperCase(ConvertWhiteSpace(value[i]));
if Length(S)>0 then
FDirectives.Add(S);
end;
end;
DefaultDirectives;
end;
procedure TCustomSQLScript.SetDollarStrings(AValue: TStrings);
begin
if FDollarStrings=AValue then Exit;
FDollarStrings.Assign(AValue);
If FUseDollarString then
RecalcSeps;
end;
procedure TCustomSQLScript.SetSQL(value: TStrings);
begin
FSQL.Assign(value);
FLine:=1;
FCol:=1;
end;
procedure TCustomSQLScript.SetTerminator(AValue: AnsiString);
begin
if FTerminator=AValue then Exit;
FTerminator:=AValue;
if Length(FSeps)>0 then
FSeps[0]:=FTerminator;
end;
procedure TCustomSQLScript.SetUseDollarString(AValue: Boolean);
begin
if FUseDollarString=AValue then Exit;
FUseDollarString:=AValue;
RecalcSeps;
end;
function TCustomSQLScript.GetLine: Integer;
begin
Result:=FLine - 1;
end;
procedure TCustomSQLScript.AddToStatement(value: AnsiString;
ForceNewLine: boolean);
Procedure DA(L : TStrings);
begin
With L do
if ForceNewLine or (Count=0) then
Add(value)
else
Strings[Count-1]:=Strings[Count-1] + value;
end;
begin
DA(FCurrentStatement);
if Not FComment then
DA(FCurrentStripped);
end;
function TCustomSQLScript.FindNextSeparator(ASeps: array of string; out
IsExtended: Boolean): AnsiString;
var
S: AnsiString;
I : Integer;
begin
Result:='';
while (FLine<=FSQL.Count) do
begin
S:=FSQL.Strings[FLine-1];
if (FCol>1) then
begin
S:=Copy(S,FCol,length(S));
end;
I:=GetFirstSeparator(S,ASeps);
if (I=-1) then
begin
if FEmitLine then
AddToStatement(S,(FCol<=1));
FCol:=1;
FLine:=FLine+1;
end
else
begin
Result:=ASeps[i];
IsExtended:=I>=MinSQLSeps;
if FEmitLine then
AddToStatement(Copy(S,1,Pos(Result,S)-1),(FCol=1));
FCol:=(FCol-1)+Pos(Result,S);
break;
end;
end;
end;
function TCustomSQLScript.Available: Boolean;
begin
With FSQL do
Result:=(FLine<Count) or
(
( FLine = Count ) and
( FCol < Length(Strings[Count-1] ) )
);
end;
procedure TCustomSQLScript.InternalStatement(Statement: TStrings; var StopExecution: Boolean);
var
cont : boolean;
begin
try
ExecuteStatement(Statement, StopExecution);
except
on E : Exception do
begin
cont := false;
if assigned (FOnException) then
FOnException (self, Statement, E, cont);
if not cont then
Raise;
end;
end;
end;
procedure TCustomSQLScript.InternalDirective(Directive, Argument: String; var StopExecution: Boolean);
var
cont : boolean;
l : TStrings;
begin
try
ExecuteDirective(Directive, Argument, StopExecution);
except
on E : Exception do
begin
cont := false;
if assigned (FOnException) then
begin
l := TStringlist.Create;
try
L.Add(Directive);
if Argument <> '' then
L.Add(Argument);
FOnException (self, l, E, cont);
finally
L.Free;
end;
end;
if not cont then
Raise;
end;
end;
end;
procedure TCustomSQLScript.InternalCommit(CommitRetaining: boolean=true);
var
cont : boolean;
l : TStrings;
begin
try
ExecuteCommit(CommitRetaining);
except
on E : Exception do
begin
cont := false;
if assigned (FOnException) then
begin
l := TStringlist.Create;
try
L.Add('COMMIT');
FOnException (self, l, E, cont);
finally
L.Free;
end;
end;
if not cont then
Raise;
end;
end;
end;
procedure TCustomSQLScript.ClearStatement;
begin
FCurrentStatement.Clear;
FCurrentStripped.Clear;
end;
procedure TCustomSQLScript.ProcessStatement;
Var
S,
Directive : String;
I : longint;
begin
if (FCurrentStatement.Count=0) then
Exit;
S:=Trim(FCurrentStripped.Text);
I:=0;
Directive:='';
While (i<FDirectives.Count) and (Directive='') do
begin
If StartsWith(AnsiUpperCase(S), FDirectives[i]) Then
Directive:=FDirectives[i];
Inc(I);
end;
If (Directive<>'') then
begin
S:=Trim(Copy(S,Length(Directive)+1,length(S)));
If (Directive[1]='#') then
begin
if not FUseDefines or not ProcessConditional(Directive,S) then
if Not FIsSkipping then
InternalDirective (Directive, S, FAborted);
end
else If Not FIsSkipping then
begin
// If AutoCommit, skip any explicit commits.
if FUseCommit
and ((Directive = 'COMMIT') or (Directive = 'COMMIT WORK' {SQL standard}))
and not FAutoCommit then
InternalCommit(false) //explicit commit, no commit retaining
else if FUseCommit
and (Directive = 'COMMIT RETAIN') {at least Firebird syntax}
and not FAutoCommit then
InternalCommit(true)
else if FUseSetTerm
and (Directive = 'SET TERM' {Firebird/Interbase only}) then
begin
FTerminator:=S;
RecalcSeps;
end
else
InternalDirective (Directive,S,FAborted)
end
end
else
if (not FIsSkipping) then
begin
InternalStatement(FCurrentStatement,FAborted);
If FAutoCommit and not FAborted then
InternalCommit;
end;
end;
procedure TCustomSQLScript.Execute;
begin
FSkipMode:=smNone;
FIsSkipping:=False;
FSkipStackIndex:=0;
Faborted:=False;
DefaultDirectives;
Repeat
NextStatement();
if Length(Trim(FCurrentStripped.Text))>0 then
ProcessStatement;
Until FAborted or Not Available;
end;
function TCustomSQLScript.NextStatement: AnsiString;
var
pnt: AnsiString;
b,isExtra: Boolean;
begin
ClearStatement;
while FLine <= FSQL.Count do
begin
pnt:=FindNextSeparator(FSeps,isExtra);
if (pnt=FTerminator) then
begin
FCol:=FCol + length(pnt);
break;
end
else if pnt = '/*' then
begin
FComment:=True;
if FCommentsInSQL then
AddToStatement(pnt,false)
else
FEmitLine:=False;
FCol:=FCol + length(pnt);
pnt:=FindNextSeparator(['*/'],b);
if FCommentsInSQL then
AddToStatement(pnt,false)
else
FEmitLine:=True;
FCol:=FCol + length(pnt);
FComment:=False;
end
else if pnt = '--' then
begin
FComment:=True;
if FCommentsInSQL then
AddToStatement(Copy(FSQL[FLine-1],FCol,Length(FSQL[FLine-1])-FCol+1),False);
Inc(Fline);
FCol:=1;
FComment:=False;
end
else if pnt = '"' then
begin
AddToStatement(pnt,false);
FCol:=FCol + length(pnt);
pnt:=FindNextSeparator(['"'],b);
AddToStatement(pnt,false);
FCol:=FCol + length(pnt);
end
else if pnt = '''' then
begin
AddToStatement(pnt,False);
FCol:=FCol + length(pnt);
pnt:=FindNextSeparator([''''],b);
AddToStatement(pnt,false);
FCol:=FCol + length(pnt);
end
else if IsExtra then
begin
AddToStatement(pnt,false);
FCol:=FCol + length(pnt);
pnt:=FindNextSeparator([pnt],b);
AddToStatement(pnt,false);
FCol:=FCol + length(pnt);
end;
end;
while (FCurrentStatement.Count > 0) and (trim(FCurrentStatement.Strings[0]) = '') do
FCurrentStatement.Delete(0);
while (FCurrentStripped.Count > 0) and (trim(FCurrentStripped.Strings[0]) = '') do
FCurrentStripped.Delete(0);
Result:=FCurrentStatement.Text;
end;
constructor TCustomSQLScript.Create(AnOwner: TComponent);
Var
L : TStringList;
begin
inherited;
L:=TStringList.Create;
With L do
begin
Sorted:=True;
Duplicates:=dupIgnore;
end;
FDefines:=L;
FCommentsInSQL:=True;
FTerminator:=';';
L:=TStringList.Create();
L.OnChange:=@SQLChange;
FSQL:=L;
L:=TStringList.Create();
L.OnChange:=@DollarStringsChange;
FDollarStrings:=L;
ReCalcSeps;
FDirectives:=TStringList.Create();
FCurrentStripped:=TStringList.Create();
FCurrentStatement:=TStringList.Create();
FLine:=1;
FCol:=1;
FEmitLine:=True;
FUseCommit := true;
FUseDefines := True;
FUseSetTerm := True;
DefaultDirectives;
end;
destructor TCustomSQLScript.Destroy;
begin
FreeAndNil(FCurrentStripped);
FreeAndNil(FCurrentStatement);
FreeAndNil(FSQL);
FreeAndNil(FDirectives);
FreeAndNil(FDefines);
FreeAndNil(FDollarStrings);
inherited Destroy;
end;
procedure TCustomSQLScript.SetDefines(const Value: TStrings);
begin
FDefines.Assign(Value);
end;
procedure TCustomSQLScript.DefaultDirectives;
Procedure Add(S : String);
begin
if FDirectives.IndexOf(S)=-1 then
FDirectives.Add(S);
end;
begin
// Insertion order matters as testing for directives will be done with StartsWith
if FUseSetTerm then
Add('SET TERM');
if FUseCommit then
begin
Add('COMMIT WORK'); {SQL Standard, equivalent to commit}
Add('COMMIT RETAIN'); {Firebird/Interbase; probably won't hurt on other dbs}
Add('COMMIT'); {Shorthand used in many dbs, e.g. Firebird}
end;
if FUseDefines then
begin
Add('#IFDEF');
Add('#IFNDEF');
Add('#ELSE');
Add('#ENDIF');
Add('#DEFINE');
Add('#UNDEF');
Add('#UNDEFINE');
end;
end;
function TCustomSQLScript.ProcessConditional(Directive: String; Param: String
): Boolean;
Procedure PushSkipMode;
begin
if FSkipStackIndex=High(FSkipModeStack) then
Raise ESQLScript.Create(SErrIfXXXNestingLimitReached);
FSkipModeStack[FSkipStackIndex]:=FSkipMode;
FIsSkippingStack[FSkipStackIndex]:=FIsSkipping;
Inc(FSkipStackIndex);
end;
Procedure PopSkipMode;
begin
if FSkipStackIndex = 0 then
Raise ESQLScript.Create(SErrInvalidEndif);
Dec(FSkipStackIndex);
FSkipMode := FSkipModeStack[FSkipStackIndex];
FIsSkipping := FIsSkippingStack[FSkipStackIndex];
end;
Var
Index : Integer;
begin
Result:=True;
if (Directive='#DEFINE') then
begin
if not FIsSkipping then
FDefines.Add(Param);
end
else if (Directive='#UNDEF') or (Directive='#UNDEFINE') then
begin
if not FIsSkipping then
begin
Index:=FDefines.IndexOf(Param);
if (Index>=0) then
FDefines.Delete(Index);
end;
end
else if (Directive='#IFDEF') or (Directive='#IFNDEF') then
begin
PushSkipMode;
if FIsSkipping then
begin
FSkipMode:=smAll;
FIsSkipping:=true;
end
else
begin
Index:=FDefines.IndexOf(Param);
if ((Directive='#IFDEF') and (Index<0)) or
((Directive='#IFNDEF') and (Index>=0)) then
begin
FSkipMode:=smIfBranch;
FIsSkipping:=true;
end
else
FSkipMode := smElseBranch;
end;
end
else if (Directive='#ELSE') then
begin
if (FSkipStackIndex=0) then
Raise ESQLScript.Create(SErrInvalidElse);
if (FSkipMode=smIfBranch) then
FIsSkipping:=false
else if (FSkipMode=smElseBranch) then
FIsSkipping:=true;
end
else if (Directive='#ENDIF') then
PopSkipMode
else
Result:=False;
end;
{ TEventSQLScript }
procedure TEventSQLScript.ExecuteStatement(SQLStatement: TStrings;
var StopExecution: Boolean);
begin
if assigned (FOnSQLStatement) then
FOnSQLStatement (self, SQLStatement, StopExecution);
end;
procedure TEventSQLScript.ExecuteDirective(Directive, Argument: String;
var StopExecution: Boolean);
begin
if assigned (FOnDirective) then
FOnDirective (Self, Directive, Argument, StopExecution);
end;
procedure TEventSQLScript.ExecuteCommit(CommitRetaining: boolean=true);
begin
if assigned (FOnCommit) then
FOnCommit (Self);
end;
procedure TEventSQLScript.Execute;
begin
if assigned (FBeforeExec) then
FBeforeExec (Self);
inherited Execute;
if assigned (FAfterExec) then
FAfterExec (Self);
end;
end.
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