Borland C Builder 6

Borland/!Builderv

BDE, InterBase Express, ADO Express (dbGo) dbExpress -

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ISBN 5-93772-094-6

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ISBN 5-93772-094-6 .., 2003 , 2003 77.99.6.953..438.2.9. 04.02.1999

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Database Desktop 26 26

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35 36 Items 37 40 (Fields) 47 50 60 66 67 70 TDataSource 72

TField 75, TField 78 . 82 (Calculated Fields) 85

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TSession 114 TSession 115 Paradox dBASE.... 117 119 121

128 128, 130 ( TDBChart) 131 TDBCtrlGrid 135 ( TDBGrid) 136 Columns. TColumn 136 144 149 OnTitleClick 149

OnDrawColumnCell 153 TQuery 159

SQL 159 160

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(DML) 161 (Select) 161

Select 161 From 762 Where 765 Group By. 768 Having 768 Order By 769

(Delete) 169 (Insert) 169 (Update) 170 (Union) 170 171 SQL 171 (DDL) 173 (Create Table) 173 (Alter Table) 175 (Drop Table) 175 (Create Index) 175 (Drop Index) 176

SQL TQuery. (SQL Builder) 176

RequestLive 179 180 182

TUpdateSQL 182 TBatchMove 189 192 193

4. - 195 Interbase 196

Interbase (IBConsole) 197 ISQL 202

Interbase 204 , Interbase 204 SQL 205 206


(Domains) 209 211 216

(Generators), (Triggers) (Stored Procedures) 277

(Views) 226 (Exceptions) 229 230

232 233 dbExpress 234 IBExpress 237 dbGo (ADO) 240 dbExpress 245 TSQLTable 246 TSQLQuery, TSQLStoredProc TSQLDataSet 260 TSQLCIientDataSet 263 TSQLMonitor 270

273

5. 275 QuickReport 275

276 279 TQuickRep 282 291 Quick Report 296

Decision Cube 297 302

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Category, . . . , Category, Category. : 1 , i. , Long Integer ; Autoincrement.

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voidvoidvoidvoid

_fastcall_fastcall_fastca!1fastcall

Fi rst(void)Prior(void)Next(void);Last(void) ;

int fastcall MoveBy(int Distance);property bool Bof = (read = FBof, nodefault};property bool Eof = (read=FEof, nodefault};

//

//

. MoveBy Distance - . Distance , . -

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Distance. , ,

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Bof (Begin of file) Eof (End of file) , - . Bof true :

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Prior, ;Q SetRange .

/ false. Eof, true :G ;G Last; Next, ;1_1 SetRange .

/ Eof . -, , .

(, AfterScroll TTable) / Eof, , , .

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(Bof = = true + Prior) (Eof ' = = true + Next) .

Bof Eof TTable, . , VCL TPanel. TPanel - , Caption. ,

, Bevellnner - bvRaised, BevelOuter bvLowered.

, , ( TButton). Name ( ): BFirst, BPrior, BNext BLast, Caption First, Prior, Next Last . Tag 1 (BFirst), 2 (BPrior), 3 (BNext) 4 (BLast) , ,

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TEdit, TButton. BMoveBy ( Name) (Caption) MoveBy. TEdit Text. ( ):EPlan EReally. . , , TEdit (TLabel). (Caption): Bof Eof ( ). TEdit Text : EBofu EEof. , , .

( TDBGrid(DBGridl)), TDataSource (DataSourcel) TTable (Tablet). , - . Table 1 Items, Active false. , - . 2.8.

2. 43

*: i Fffrfj Pnpfj Ne j^: 1!I ' ; i ~% McveByj j

. 2.8. , Bof Eof

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. BFirst, Events OnClick. C++ Builder BFirstClick. - OnClick ( ). :

void fastcall TForml::BFirstCl ick(TObject *Sender)TButton * Temp;Temp=dynamic_cast(Sender);if(Temp)

switch(Temp->Tag)case 1:

case 2 :

case 3:

case 4:

Tablel->First(); break;Tablel->Prior(); break;Tablel->Next(); break;Tablel->Last(); break;

BFirst->Enabled=!Tablel->Bof;BPrior->Enabled=!Tablel->Bof;BNext->Enabled=!Tablel->Eof;Blast->Enabled=!Tablel->Eof;

Temp TButton.

TButton Sender. ,


(, ). , :

. , !Tag . , Tag 1 4. , , . ! / 0/ . /, BFirst BPrior , !Eof BNext BLast. Bofvam Eof ' false, .

BMoveBy EPlan EReally. , -

EPlan BMoveBy, , ,

EReally. , OnClick BMoveBy :

void fastcall TForml::BMoveByClick(TObject *Sender){

EReally->Text=IntToStr(Tablel->MoveBy(StrToIntDef(EPlan->Text,0))) ;

} StrToIntDef

EPlan->Text AnsiString . - StrToIntDef , . , MoveBy, AnsiString EReally.

EPlan Enter. , - OnKeyPress EPlan :

void fastcall TForml::EPlanKeyPress(TObject Sender, char &Key){

if(Key == VK_RETURN) BMoveByClick(NULL);} , ,

(. . , ASCII) , . , Enter(VK_RETURN , Enter), BMoveBy NULL.

/ / , , / Eof TTable. , A/terScroll - TTable. , , , ( , ). - AfterScroll :

2. 45

void fastcall TForml::TablelAfterScroll(TDataSet *DataSet)if(DataSet->Bof) EBof->Text="true";else EBof->Text="false";if(DataSet->Eof) EEof->Text="true";else EEof->Text="false";

AfterScroll - DataSet. .So/ ./ , / EEof. , ,

: BFirst BPrior ( ). OnCreate Forml:

void fastcall TForml::FormCreate(TObject *5ender)

Tablel->0pen();BFirst->Enabled=false;BPrior->Enabled=false;

} ( NavMethods) -

. -

.

2.1 2.2. 2.1. NavMethods

#ifndef UnitlH#defme UnitlH

#include #include #include #include #include #include #include #include #include #include

class TForml : public TForm

published: // IDE-managed CdmponentsTTable *Tablel;TDataSource *DataSourcel;TDBGrid *DBGridl;TButton *BFirst;TButton *BPrior;


TButton *BNext;TButton *BLast;TPanel *Panell;TPanel *Panel2;TButton *BMoveBy;TEdit *EPlan;TEdit *EReally;TPanel *Panel3;TEdit *EBof;TLabel *Labell;TLabel *Label2;TEdit *EEof;void _ fastcall FormCreate(TObject *Sender) ;void _ fastcall BFi rstClick(TObject *Sender) ;void _ fastcall BMoveByClick(TObject *Sender);void _ fastcall EPlanKeyPress(TObject *Sender, char &Key)void _ fastcall TablelAf terScroll (TDataSet *DataSet);

private: // User declarationspublic: // User declarations

_ fastcall TForml(TComponent* Owner);

extern PACKAGE TForml *Forml;//-- ........ -#endif

2.2. NavMethods

#include #pragma hdrstop

#include "Unitl.h"

#pragma package(smart_init)#pragma resource "*.dfm"TForml *Forml;

_fastcall TForml : :TForml(TComponent* Owner): TForm(Owner)

void _ fastcall TForml : :FormCreate(TObject *Sender){

Tablel->0pen() ;BFi rst->Enabled=false;BPrior->Enabled=false;

void _ fastcall TForml : :BFirstClick(TObject *Sender)

2. 47TButton * Temp;

Temp=dynamic_cast(Sender);

if(Temp)

switch(Temp->Tag)/

case 1:

case 2:

case 3:

Tablel->First(); break;

Tablel->Prior(); break;

Tablel->Next(); break;case 4:

Tablel->Last(); break;

BFirst->Enabled=!Tablel->Bof ;BP r i or ->Enabled=! Table l->Bof;BNex t->Enabled=! Table! ->Eof;Bias t->Enabled=! Table!- >Eof ;

void _ fastcall TForml: :BMoveByClick(TObject *Sender)t

EReally->Text=IntToStr(Tablel->MoveBy(StrToIntDef (EPlan->Text ,0)

void _ fastcall TForml : :EPlanKeyPress(TObject *Sender, char &Key){

if (Key == VK_RETURN) BMoveByClick(NULL) ;

void _ fastcall TForml: :TablelAf terScroll (TDataSet *DataSet)

i f(DataSet->Bof)elseif (DataSet->Eof)else

EBof->Text="true";EBof->Text="false"EEof->Text="true";EEof->Text="false"

(Fields) Fields.

TFields , TField. TField . TField , . TField , -

Fields.


, TFields , , .

TFields:property int Count = {read=GetCount, nodefault};

_property TDataSet* DataSet = {read=FDataSet};property TField* Fieldsfint Index] =

{read=GetField, write=SetField}; . DataSe

, Fields. - . Count : TField, . . Fields - :

[].

TFields . , (, TCIientDataSet), .

AggFields.

TFields , - (TField). :

TField* operator [] (int Index) { return Fields[Index] ; }TField* fastcall FieldByNumber(int FieldNo);TField* fastcall FieldByName(const AnsiString FieldName); [] -

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Items 0 ItemNo, 1 Item, Price - 5. Count 6. : ItemNo 0, Item \ ..

. (Fields Editor), - .

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Description , , . ,

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Add fields. - , Description ( , - Ctrl) . , Description.

2. 49

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/7 FieldByNumber. , . FieldByNumber -, , [] - .

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, ( TLabel), TListView, . -. Items MyData. , - , -

( Description ). TListView. ,

: Index, Fieldsflndex] FieldByNumber [Index]. , ViewStyle vsReport. OnCreate :

void _ fastcall TForml: :FormCreate(TObject *Sender){

Tablel->0pen();Labell->Caption=" Items " +IntToStr(Tablel->Fields->Count)+ " : " ;

TListltem *Temp;

for(int i=0;iFields->Count;i++)

Temp=ListViewl->Items->Add() ;Temp->Caption=i ;Temp- > Subl terns ->Add (Table l->Fi eld s->Fi elds [i] ->FieldName) ;Temp- >SubI terns ->Add (Table l->Fi elds ->FieldByNumber (i+1) ->FieldName) ;

.

[] FieldByNumber (. . 2.9).

Count TF/e/ds , . , ,

Items, Tab/e7->F/e/ds->Count 5, . F/eldCount (, TDataSet). , ,

FieldByName. TField, . ,


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FieldByName,

Tablel->FieldByName("Item") ' // ItemTablel->FieldByName("Description") // Description

Hems cc

: temNo l(?.rr''4'0: Item Iten

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4 . Price i Index5

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void fastcall ApplyRange(void);void fastcall CancelRange(void);void fastcall EditRangeEnd(void);void fastcall EditRangeStart(void);void fastcall SetRange(const System::TVarRec * StartValues,const int StartValues_Size, const System::TVarRec * EndValues,

const int EndValues_Size);void fastcall SetRangeEnd(void);void fastcall SetRangeStart(void); , , TDataSet. ,

() , .Q ,

. IndexFieldNames, IndexName. IndexFieldNames AnsiString, - , .

IndexName, , , . , ,

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Q , - .

2. 51

SetRangeStart SetRangeEnd. - EditRangeStart EditRangeEnd.

Q , ApplyRange. CancelRange - .

, Items Category. , Paradox . Items, Category 3 5.

Table1 ->DatabaseName="MyData";Tablel->TableName="Items.db";Tablel->IndexFieldNames="Category";Tablel->0pen();Tablel->SetRangeStart();Tablel->FieldByName("Category")->AsInteger=3;Tablel->SetRangeEnd();Table!->FieldByName("Category")->AsInteger=5;Tablel->ApplyRange(); SetRangeStart SetRangeEnd ApplyRange -

SetRange, . SetRange- ( ) - . :

Tablel->DatabaseName="MyData";Tablel->TableName="Items.db";Tablel->IndexFieldNames="Category";Tablel->0pen() ;Tablel->SetRange(OPENARRAY(TVarRec,(3)), OPENARRAY(TVarRec,(5)));

OPENARRAY , , .

, OPENARRAY(TVarRec,(3)) SetRange, OPENARRAY(TVarRec,(5)) - . / Open/Array Object Pascal, .

, C++ , VCL, Object Pascal, . OPENARRAY ARRAYOFCONST Borland C++ Builder.

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TDBGrid, TDataSource, Items , . , . (TPanel). (TButton). : BPriorCat, BNextCat, BPriorRec, BNextRec, : Prior Category, NextCategory, Prior Record, Next Record. (TEdii),

52 Borland C++ Builder 6. (TLabel) . BApply, BCancel Apply Rang: Cancel Range . ECat Text Category. . 2.10.

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2. 53

Unit 1. :void fastcall TForml::SetFilterCat(long int Cat){

if(Cat == 0) return;Tablel->SetRangeStart();Tablel->FieldByName("Category")->AsInteger=Cat;Tablel->SetRangeEnd();Tablel->FieldByName("Category")->AsInteger=Cat;Tablel->ApplyRange();ECat->Text=IntToStr(Cat);BApply->Enabled=false;BCancel->Enabled=true;

} SetFilterCat , .

Cat 0, . . SetFilterCat ECat -

Apply Range Cancel Range. , TDBGrid , . Aslnteger TField - Integer. Aslnteger TField , .

.

KeyExclusive boo/; .

,

. ,

, 4 5.Tablel->SetRangeStart();Tablel->FieldByName("Category")->AsInteger=3;Tablel->KeyExclusive=false;Tablel->SetRangeEnd();Tablel->FieldByName("Category")->AsInteger=5;Tablel->ApplyRange();

, , -

OnClick. BPriorCat OnClick Tablel->First(), BNextCat Tablel->Last(), BPriorRec BNextRec Tablel->Prior() Tablel->Next(). , (. . - / Eof true) , .

OnClick (BPriorCat, BNextCat, BPriorRec BNextRec) -


Enabled ,

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OnClick , . , ^

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. 2.3 2.4.

2.3. ApplyRangeDemo// -#ifndef UnitlH#define UnitlH//#include #include #include #include #include #include #include ^include

2. 55

private: // User declarationsvoid _ fastcall SetFiUerCat(long int Cat);

public: // User declarations_fastcall TForml(TComponent* Owner);

extern PACKAGE TForml *Forml;//#endif

2.4. ApplyRangeDemo

#include #pragma hdrstop#include "Unitl.h"

#pragma package(smart_ini t)#pragma resource "*.dfm"TForml *Forml;long int Cat;

_fastcall TForml: :TForml(TComponent* Owner): TForm(Owner)

void _ fastcall TForml: :FormCreate(TObject *Sender){

Tablel->IndexFieldNames="Category" ;Tablel->0pen() ;Cat=l;SetFilterCat(l);BPriorCat->Enabled=f alse;BPriorRec->Enabled=false;

void _ fastcall TForml: :BPriorCatClick(TObject *Sender){

Tablel->First() ;if (Cat != 0){

if(Cat > 1) Cat--;SetFilterCat(Cat);ECat->Text=IntToStr(Cat) ;Tablel->Last() ;

}if(Cat < 2) BPriorCat->Enabled=false;if (BNextCat->Enabled == false) BNextCat->Enabled=true;if (BNextRec->Enabled == false) BNextRec->Enabled=true;


void _ fastcall TForml : : BNextCatClick(TObject *Sender){

Tablel->Last() ;if(Cat != 0){

if (Cat 12) Cat++;SetFilterCat(Cat) ;ECat->Text=IntToStr(Cat) ;

}if(Cat == 12) BNextCat->Enabled=false;if (BPriorCat->Enabled == false) BPriorCat->Enabled=true;if (BPriorRec->Enabled == false) BPriorRec->Enabled=true;

void _ fastcall TForml : :BNextRecClick(TObject 'Sender){

Tablel->Next();if (Tablel->Eof){

if ((Cat == 12) | | (Cat == 0)){

BNextRec->Enabled=false;BNextCat->Enabled=false;

}if(Cat != 0){

if(Cat 12) Cat++;SetFilterCat(Cat) ;ECat->Tex.t = IntToStr(Cat) ;

if (BPn'orRec->Enabled == false) BPriorRec->Enabled=true;if((Cat == 2) && (BPriorCat->Enabled == false))

BPriorCat->Enabled=true;if((Cat == 12) && (BNextCat->Enabled == true))

BNextCat->Enabled=false;

void _ fastcall TForml : :BPriorRecClick(TObject *Sender){

Tablel->Prior() ;if(Tablel->Bof){

if(Cat < 2) BPriorRec->Enabled=false;else{

if (Cat > 1) Cat--;SetFilterCat(Cat) ;ECat->Text=IntToStr(Cat) ;Tablel->Last() ;

2. 57

if(BNextRec->Enabled == false) BNextRec->Enabled=true;if((Cat == 11) && (BNextCat->Enabled == false))

BNextCat->Enabled=true;if((Cat == 1) && (BPriorCat->Enabled == true^)

BPriorCat->Enabled=false;

void fastcall TForml::5etFilterCat(long int Cat)

if(Cat == 0) return;

Tablel->SetRangeStart();Tablel->FieldByName("Category")->AsInteger=Cat;Tablel->SetRangeEnd();Tablel->FieldByName("Category")->AsInteger=Cat;Tablel->ApplyRange();

ECat->Text=IntToStr(Cat);BApply->Enabled=false;BCancel->Enabled=true;

void fastcall TForml::BCancelClick(TObject *5ender)Cat=0;Tablel->CancelRange();BApply->Enabled=true;BCancel->Enabled=false;ECat->Text="All";BPriorCat->Caption="Fi rst Record";BNextCat->Caption="Last Record";

void fastcall TForml::BApplyClick(TObject Sender)Cat=StrToIntDef(ECat->Text,0);if ((Cat < 1) || (Cat > 12)) Cat=l;SetFilterCat(Cat);BPriorCat->Caption="Prior Category";BNextCat->Caption="Next Category";

Filter, Filtered FilterOptions. TBDEDataSet, - TDataSet . Filter Filtered , , , . .

.

Filter , - , . -

58 Borland C++ Builder 6. :

= .

, Category=3, Filter, , , 3. - , , ,

. , -

, .

, : [ ]. :

(), (>), (

2. 59

OnCreate OnClose :

void fastcall TForml::FormCreate(TObject *5ender){

Tablel->0pen();}void fastcall TForml::FormClose(TObject *Sender,

TCloseAction &Action){

Tablel->Close();} , , :

Tablel , . OnClick BApply BCancei.

void fastcall TForml::BApplyClick(TObject *Sender){

Tablel->Filter=ECriteria->Text;if(CBCaseInsensitive->Checked)

Table1->FiIterOptions foCaselnsensitive;else Tablel->FilterOptions foCaselnsensitive;if(CBNoPartialCompare->Checked)

Table1->FiIterOptions foNoPartialCompare;else Tablel->FilterOptions foNoPartialCompare;Tablel->Filtered=true;

}void fastcall TForml::BCancelClick(TObject *Sender){

Tablel->Filtered=false;} BCancei Filtered -

false', . BApply , ECriteria, , ECriteria, Filter, , CBCasefnsensitive CBNoPartialCompare, FilterOption. , Filtered true.

! , .

. . 2.11 Items, Item. , Case Insensitive , No Partial Compare. -

. -

. 2.11 , Item sam Sam ( ) (, ).


OnFilterRecord . TDataSet :

typedef void _ fastcall ( _ closure *TFilterRecordEvent)(TDataSet* DataSet, bool &Accept) ;

( ) DataSet , Filtered tru> , ,

Accept - false. OnFilterRecon

pax . Edit Edit2.

void _ fastcall TForml: :TablelFilterRecord(TDataSet *DataSet,bool &Accept)

{Accept=(DataSet->FieldValues["Price"J >= StrToIntDef (Edi tl->Text ,0))&&(DataSet->FieldValues["Price"] Text, 1000)) ;

,

. SetKey ( EditKey GotoKey . - :

void _ fastcall SetKey(void) ;void _ fastcall Edi tKey (void) ;bool __ fastcall GotoKey (void) ;void _ fastcall GotoNearest(void) ; , , -

.

IndexFieldNames ( , ), - IndexName ( ). , : Field '_ ' is not indexed and cannot be modified ('_ ' ). - SetKey. , dsSetKey. -

. , -

,

IndexFieldNames IndexName. GotoKey .

() , true . - , GotoKey ^/^.

EditKey , SetKey, -

2. 61

, .

, , , ,

. SetKey , , , ,

. GotoKey , EditKey , , . GotoKey , - , , .

, Item Items.

Tablel->IndexName="ItemNDX";Tablel->SetKey();Tablel->FieldByName("Item")->AsString=ESample->Text;Tablel->GotoKey();Tablel->IndexName=""; ,

. , Items Item ItemNDX. SetKey, , Item , ESample. GotoKey ,

. .

, IndexName ItemNDX, Item , ItemNDX ( ). - , ,

, .

-

(. . -). , , , -

IndexName. , ,

GotoKey GotoNearest. - ,

.

. GotoNearest , - , .

, GotoKey GotoNearest, -. FindKey FindNearest. :

bool fastcall FindKey(const System::TVarRec * KeyValues,const int KeyValues_Size);

void fastcall FindNearest(const System::TVarRec * KeyValues,const int KeyValues_Size);

(- ), . . , -


OPENARRAY ARRAYOFCONST. FindKey FindNearest SetKey , , . , ,

, :

Tablel->IndexName="ItemNDX";Tablel->FindKey(OPENARRAY(TVarRec,(ESample->Text)));Tablel->IndexName="";

Locate. TBDEDataSet ( , TDataSet) :

virtual bool fastcall Locate(const AnsiString KeyFields,const System::Variant &KeyValues, Db::TLocateOptions Options); , ?

TBDEDataSet (TTable, TQuery, TStoredProc). ,

Locate AnsiString, . .

Variant. , .

Variant VarArrayOf. TLocateOptiom. loCaselnsensitive ( ) loPartialKey ( - ). Options .

, -

Locate.

void fastcall TForml::BLocateClick(TObject *Sender){

TLocateOptions SearchOptions;SearchOptions.ClearQ;if(CBCaselnsensitive->Checked) SearchOptions loCaselnsensitive;if(CBPartialKey->Checked) SearchOptions loPartialKey:Tablel->Locate(EField->Text, ESample->Text, SearchOptions);

} CBCaselnsensitive CBPartialKey -

. -

EField, ESample.Lookup , ,

.

TBDEDataSet :

virtual System::Variant fastcall Lookup(const AnsiString KeyFields,const System::Variant SKeyValues, const AnsiString ResultFields);

Lookup , , - .

2. 63

.

Locate (. ). - AnsiString. , . , - Items, , :

EField->Text=Tablel->Lookup("Item","HP LaserJet 1200","Index"); , -

FindFirst, FindPrior, FindNext FindLast. , , ,

, , , -

. -

, Find... . FindFirst, FindPrior, FindNext FindLast TDataSet :

bool fastcall FindFirst(void);bool fastcall FindPrior(void);bool fastcall F indNext(void);bool fastcall F indLast(void); true

false . OnFilterRecord , . Filtered false.

. , -

OnFilterRecord, .

Find... OnFilterRecord, -. , -

TDBGrid, TTable TDataSource, . Items MyData. (: EField ESample), (: Field Sample) (:BFindFirst, BFindPrior, BFindNext, FindLast; , : Find First, FindPrior, Find Next, Find Last; Tag, : 1,2,3, 4). , . 2.12.

BFindFirst OnClick - OnClick . :

TButton* Temp=dynamic_cast(Sender);if(Temp){

swi tch(Temp->Tag){

case 1: Tablel->FindF1rst(); break;case 2: Tablel->FindPrior(); break;case 3: Tablel->FindNext(); break;

64 Borland C++ Builder 6. case 4: Tablel->FindLast(); break;

};DBGrid l->SetFocus() ;

] ,

.

Sender TButton *, , , Tag, !( ). TDBGrid.

OnFilterRecord:

Accept=(DataSet->Fields->FieldByName(EField->Text)->As5tring.AnsiPos(ESample->Text) 0) ; ,

EField. AsString AnsiString. AnsiPos AnsiString , , ESample, !. , AnsiPos , ( Accept true, Find... , true. FindPrior FindNext nonet , .

5^ *SfjlSHum :JFC-PGA - V.FiBdtosr;;::.! ' FBiti^ fe

LJ

63 Socket A GIGA-BYTE GA-7ZXE63 Socket A GIGA-BYTE GA-7ZX Rev. 5X6< Socket A ChaJnTBchCT-7AJA2 '65 Socket A GIGA-BYTE GA-7ZMMM66 Socket A ASUS A7V133-C

HJfl Socket 370 FC PGA/PPGA Canvon 6LEBMS68 Socket 370 FC-PGA/PPGA Canyon SLEBMS-T69 Socket 370 FC-PGA/PPGA Menli 8997C Socket 370 FC-PGA/PPOA PC ParlnerT205C71 Socket 37C FC-PGA/PPOA FoslFame 3SLAP72 Socket 370 FC-PGA/'PPGA PC Partner C203T . :-?-GetBookmark();}void fastcall TForml: :BGotoBockmarkClick(TObject *Sender){

Tablel->GotoBookmark(MyTBookmark);Tablel->FreeBookmark(MyTBookmark);MyTBookmark=NULL;

} BGotoBookmark

FreeBookmark , MyTBookmark GetBookmark. MyTBookmark NULL. , , BGetBookmark . - OnClose :

if(MyTBookmark) Tablel->FreeBookmark(MyTBookmark); ,

MyTBookmark. NULL, , FreeBookmark.

, ,

.

BookmarkValid, TBDEDataSet :

virtual bool fastcall BookmarkValid(void * Bookmark); TBDEDataSet, -

, TQuery. TBookmark, , , BookmarkValid - true.

, , -

. , (unidirectional)


. ,

, IsUniDirectional.

TDataSource , ,

. , Post , ,

: Dataset not in edit or insert mode ( ). -, Post, , .

State. TDataSet :

property TDataSetState State = {read=F5tate, nodefault}; State, , .

TDataSetState:

dslnactive , - -.

dsBrowse . .

dsEdit . , , .

, , .

, Post ( ) Cancel ( ). dsBrowse.

G dslnsert , -, Insert Append. ,

. dsEdit, - ( , ) Post Cancel dsBrowse.

dsSetKey - . , ,

SetRange. dsSetKey - TClientDataSet.

dsCalcFields OnCalcFields (. . ( ) - ). () .

Q dsFilter - State OnFilter-Record. . .

2. BDE 73

U dsNewValue, dsOldValue dsCurVahie. , - BDE . - TField NewValue, OldValue CurValue.

dsBlockRead - , .

, -

.

Q dslnternalCalc BDE , ( FieldKind)fklnternalCalc. Tvm&fklnternalCalc , , - irniufkCalculated, . ( TField) .

Q dsOpening. - , .

State . TDataSource State TDataSetState, , TDataSource. -, TDataSource. , , TDataSource.

TDataSource - , -

. , C++ Builder, TDataSource (conduit) - . ,

, TDataSource, . ,

TDataSource, ,

(Data-aware Controls) - . -

, TDataSource -- ( / (Master/Detail)).

TDataSource : State, AutoEdit, DataSet Enabled. State TDataSetState . State TDataSource , Enabled false - DataSet, State dslnactive .

Enabled , .

false . DataSet TDataSet, TDataSource. , , Enabled true, DataSet


TDataSet (, , :, ).

, ;TDBGrid , TDBGrid, (dsEdit). (- Options TDBGrid) dgAlwaysShowEditor Enter F2, ; .

, AutoEdit TDataSource true. AutoEdit - false, Edit. .

TDataSource, , : IsLinkedTo Edit. Edit TDataSource , . - AutoEdit. true, - . (dsBrowse), Edit . , Edit TDataSource ,

.

IsLinkedTo , TDataSource TDataSet. - .

TDataSource. : OnDataChange, OnStateChange OnUpdateData. TNotifyEvent, - OnDataChange :

typedef void fastcall ( closure *TDataChangeEvent)(TObject* Sender, TField* Field);

OnDataChange , , -

(, ). , Field NULL. To - Field , . .

, , , -

,

.

OnUpdateData , , BeforePost. - -

.

, , OnStateChange , , -

. -

2. BDE 75

, , ,

.

OnStateChange, ModifyRec, . IDE C++ Builder - TStatusBar. ( Align alBottom). SimplePanel TStatusBar true SimpleText - .

OnStateChange - :

void fastcall TForml::DataSourcelStateChange(TObject *Sender)AnsiString StatusText;

switch(DataSoureel->State)

case dslnactive: { StatusText="Inactive"; break; }case dsBrowse: { StatusText="Browse"; break; }case dsEdit: { StatusText="Edit"; break; }case dslnsert: { StatusText="Insert"; break; }case dsSetKey: { StatusText="SetKey"; break; }case dsCalcFields: { StatusText="CalcFields"; break; }case dsFilter: { StatusText="Filter"; break; }case dsNewValue: { StatusText="NewValue"; break; }case dsOldValue: { StatusText="01dValue"; break; }case dsCurValue: { StatusText="CurValue"; break; }case dsBlockRead: { StatusText="BlockRead"; break; }case dsInternalCalc: { StatusText="InternalCalc"; break; }case dsOpening: { StatusText="Opening"; break; }default: 5tatusText="Unknown" ;

StatusBarl->SimpleText="DataSet Status: " + StatusText;

, .

.

.

,

.

TField TField (,

..). , - . TField -, , ,

C++ Builder. , 2.1.


2.1. TField

TADTField

TAggregateFi eld

TArrayField

TAutoIncField

TBCDField

TBinaryField

TBlobField

TBooleanField

TBytesField

TCurrencyField

TDataSetField

TDateField

TObjectField. ADT (Abstract Data Type). ADT (), - . -

ADT. TField. - . -

.

, , -

.

TObjectField. . -

.

(, ), (, ADT). TInteger Field, , ,

TNumericField. . TNumericField. - - (Binary CodedDecimal). BCD - ,

.

TField. .

TField. -, BLOB (Binary Large Object). TField. .

TBinaryField. Byte.

TFloatField, - TNumericField. Currency. TObjectField. , ,

(nested) . TDateTimeField. , .

2. 77

TDateTimeField

TFloatField

TFMTBCDField

TGraphicField

TGuidField

TIDispatchField

TIntegerField

TInterfaceField

TLargelntField

TMemoField

TReferenceField

TSmalllntField

TSQLTimeStampField

TStringField

TTimeField

TVarBytesField

TField. , .

TNumericField. , .

TNumericField. - BCD (BinaryCoded Decimal). TFMTBCDField - TBCDField -. C++ Builder 6. TBlobField. , .

TStringField. ,

(GU1D Globally Unique Identifier). TInterfaceField. , IDispatch. TNumericField. .

TField. , , -

(lUnknown). TNumericField. large integer. TBlobField. MEMO. TObjectField. , .

TIntegerField, -, , TNumericField. small integer. TField. Date/Time dbExpress. - C++ Builder 6. TField. .

TDateTimeField. , .

TBytesField, , , TBinaryField. -

.


TVariantField

TWideStringField

TWordField

TField. Variant. TStringField. WideString. TInteger Field, TNumericField. Word.

TField . , , -

, ,

, -

,

. TField -

. , -

. , , TField, , TStringField, FixedChar Transliterate, .

--

TField: . - , ,

.

, TField TField . -

, , .

C++ Builder. TField -

. As - , .

, .

.

Ansi String Price=Tablel->FieldByName("Price")->AsString;int IntPrice=Tablel->FieldByName("Price")->AsInteger;Currency CurPrice=Tablel->FieldByName("Price")->AsCurrency; .

.

CurValue, OldValue NewValue ( ) , , , .

,

TClientDataSet (cachedupdates). , ( Post) . OnUpdateError OnReconcileError CurValue, OldValue NewValue,

2. 79

.

Value, DisplayText Text. Value / - ( ) . . , TCurrencyField, - Value Currency. DisplayText Text AnsiString , -

. Text - . Text DisplayText OnGetText , .

DataType FieldKind . DataType - . DataType TFieldType. 2.1 -- TField. , TIntegerField ftlnteger, .. FieldKind TFieldKind:

fkData , . jkCalculated . -

OnCalcFields. fkLookup . -

.

JklnternalCalc , , /kData. , SQL, , BDE - , RequestLive true.

jkAggregate . . Calculated, Lookup,

LookupCache, LookupDataSet, KeyFields, LookupKeyFields, LookupList LookupResultField. true Calculated , , . . - OnCalcFields . - . .

AutoGenerateValue. , , -

. ,

. -

( Post) . AutoGenerateValue. , ,

. AutoGenerate Value TAutoRefreshFlag: arNone ( ), arAutoInc( ), arDefault ( ). , AutoGenerateValue,

, .


DefaultExpression. , SQL, -|. ,

, , 'No Item' '15:45'. *DefaultExpression, , ; ,

.

TField , (). , . CustomConstraint, ImportedConstraintConstraintErmrMessage HasConstraint. CustomConstraint - , -

, . -

, CustomConstraint, , ConstraintErmrMessage.

ImportedConstraint -, . , ImportedConstraint . . ImportedConstraint, , , -

, .

, , ImportedConstraint, ,

. ConstraintErrorMessage , .

HasConstraint . true, . , : CustomConstraint, ImportedConstraint DefaultExpression.

FieldKind - fkData, FieldName ,

.

TField . Islndex true, () . IsNull true, - . EditMask TEditMask ( AnsiString) .

TEditMask C++ Builder.

TField . BDE. , , Assign Clear. Assign Value - .

. , TablelDateO->Assign(TablelDatel) DateO - Table 1 Datel . , Date. TablelDescription->Assign(Memol->Lines) Description Tablel, Memo, -

2. BDE

Memol, . Clear , Value NULL.

TField , . OnChange, OnGetText, OnSetText OnValidate. OnChcmge , .

-

,

. OnChange - OnValidate, . OnChange - , ,

. OnChange - , .

OnValidate - .

, . OnValidate

. , -

( throw). OnChange .

OnGetText OnSetText :

typedef void fastcall ( closure *TFieldGetTextEvent)(TField* Sender,AnsiString &Text, bool DisplayText);

typedef void fastcall ( closure *TFieldSetTextEvent)(TField* Sender,const AnsiStr ing T e x t ) ;

OnGetText DisplayText Text TField. , , . -

TDBGrid OnGetText , . Sender , , Text AnsiString.

-

, Text . , -

TDBGrid, OnGetText, . , -

OnGetText, Text. , Text AsString . OnGetText -,:

void fastcall TForml::TablelItemGetText(TField *Sender,AnsiString &Text, bool DisplayText)

{Text=Sender->AsString;

82 Borland C++ Builder .

OnGetText DisplayText. , , Text .

- .

OnSetText , Text . Text, const, Text . Text . ^ OnGetText - , OnSetText .

.

(Dynamic fields), (Persistent fields). , .

. -

. -

, . ,

, .

.

,

. -

.

, - ,

. , -

.

FieldDefs . TFieldDefs , . FieldDefs , , ,

. FieldDefs - , (CalculatedFields). ( IndexDefs), .

(Persistentfields) , (Fields Editor). - , ,

, , . -

,

, , .

, -

, .

TField ( ) .

2. 83 , ( ) -

. , ,

. ,

. , -

.

, .

, ,

. ,

,- , -

.

, , -

, , .

, , -

.

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, ,

.

.

. , Name FielName. FieldName , , Name . HMCI ,

. , Tablelhem. . ,

Table!->FieldByName(Item). ,

. ; ( , ) . , Item Items TStringField, Price TCurrencyField. ] ,

, .

Delete.

(Attribute Sets). ! , SQL Explorer. SQL Explorer, . -

Associate attributes. - , .

Dictionary SQL Explorer Attribute Sets, .

, . ,

, -

, .. , -

, , . -

, Unassociate attributes. ,

.

- ,

: Save attributes, Save attributesas Retrieve attributes. Save attributes , , , .

Save attributes as . Retrieve attributes .

-

, . -

.

2.

, ,

. ,

. ,

( ) TDBEdit, , , TDBImage. ,

( Tlabel), . , ,

.

.

(Calculated Fields)-

(CalculatedFields), .. , , - . , -

, ,

, .

,

, .

.

.

OnCalcFields , . ,

,

, ,

. , -

, ,

Visible false. OnCalcFields -

.->1-. OnCalcFields . , -

, . OnCalcFields - :

Q , ;Q ( dsEdif);G (, ).

, AutoCalcFields true, OnCalcFields

(TDBGrid) . ,

, AutoCalcFields false, .

, -

86 Borland C++ Builder . MyData, , . . Database Desktop Paradox 7. , 2.2.

2.2. Employees

(Field Name)EmployeeNo ()LName ()FName ()MName ()HireDate ( )FireDate ( )Description ()Photo ()Birthday ( )

()Autoincrement (+)Alpha (A)Alpha (A)Alpha (A)Date (D)Date (D)Memo (M)Graphic (G)Date (D)

(Size)

502025

240

(Key)*

LName HireDate Required field - . Table properties Secondary Indexes Define. LName, FName MName ( ) NameNDX. , , Employees. , - . , Employees .

, - . -

, . (EmployeeNo) .

. , -

, ,

Employees. , - , .

TDBGrid, TTable TDataSource, . , , DBGridl DataSourcel, a Data-Sourcel Tablel. Tablel Employees MyData.

: , -

, , .

, .

, .. , FireDate () . - , ,

FireDate NULL. Filter - : FireDate=NULL. ,

Employees NameNDX ( - IndexName).

2. 87

() , : Name ( ), Age (), Standing (). (, )., New field , - .

Name, ( _). String Name Smalllnt Age Standing. Size 50 Name, . Field type Calculated. . 2.14 Standing.

. 2.14. Standing Name, Age Standing

LName, FName, MName, HireDate Birthday. , FireDate, ( - ). Add fie Ids. - . Visible false, . ,

false Visible ., OnCalcFields :

void _fastcall TForml: :TablelCalcFields(TDataSet *DataSet)

AnsiString FI.SI;unsigned short yearl, yearO, month, day;

if (!TablelFName->IsNull)FI=" " + (TablelFName->Value). SubString(0, 1) + "." ;

if((!Table!MName->IsNuU) && ( ! (FI . IsEmpty ()) ))SI=" " + (TablelMName->Value) . SubString(0, 1) + "." ;

TablelName->Value=TablelLName->Value + FIDate() .DecodeDate(&yearl, &month, &day) ;(TablelBirthday->Value) .DecodeDate(&year0,TablelAge->Value=yearl-year0;(TablelHireDate->Value) .DecodeDate(&year0,TablelStanding->Value=yearl-year0;

+ SI;

&month, &day) ;&month, &day) ;


.

FI SI AnsiString. , i FName . , IsNull. FNar , FI , , . Substring AnsiString. , , . ,

SI, , , ]: , . ,

AnsiString IsEmpty.

.

. 2.15. ,

Value Name , . : i , Name .

OnCalcFields (Age Standing. ( Age) , . ( Standing) - .

Date, TDateTime. TDateTime DecodeDat , .

OnCreate :

void fastcall TForml::FormCreate(TObject *Sender){

Tablel->0pen();Tablel->Filtered=true;

} .

. . 2.15 .

TDataSet TQuery. !TQuery -.

2. BDE

(Lookup Fields) (Lookup Fields)

.

.

,

, ,

. , Items Category, Category. , - - . ,

.

,

.

Category Items. , ,

TDBGrid, TTable TDataSource, . - , Tablel Items MyData. Active Tablel true, . -

Category. (2) .

. ,

Tablel. Add all fields, . , -

.

New field. , Field properties, (Name) ( Category , CategoryName), () (Size) ( - Category, String 25).

Field type Lookup, , . Lookup definition : Key Fields Dataset. Key Fields , , . -

. Key Fields, , . -

Category. Dataset

TDataSet ( : Tablel Table!). , .

Tablel, -, (- ). 2. : Lookup Keys Result Field.


: Field ptoperties: : |CrtegoiyJome

Type:.. ' . 'Sting

; Field - '

Component |ToblelC3tegoryName2 ;.,;

^J Site: |re

''. gey field*: ' JGategoi

Lookup Keys: jCainqoiyNo _Tj Besuft Field; fCotegoi

. 2.16. CategoryName Lookup Keys ;

(Lookup DataSei). , Lookup Keys, , < Key Fields. > .

1

, KtFields. CategoryNo.

Lookup definition Result Field. , Result Fieh ,

. Category. . 2.1 New Field, CategoryName.

Tablel , . Category, , , Visible //. CategoryName , Item. , : . : DisplayLabt CategoryName Category. .

.

. 2.17.

1

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10 HP LaserJet 122011 HP LaserJet 3200

J

< GDI, 2 , 600 dpi. . J

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. 2.17. , Category

2. 91

CategoryName , . , -

New field . FieldKind JkLookup, - Field type. Lookup definition , , KeyFields,LookupDataSet, LookupKeyFields LookupResultField. , , ,

, .

,

, -

. LookupCache. true, .

, -

.

, -

.

,

,

, .

, -

,- /(Master/Detail). : , , -

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TDBLookupComboBox, TDBGrid. , TTable (Tablel 2) TDataSource (DataSourcel DataSource2). DataSourcel DataSource2 Tablel 2 . Tablel Category MyData, 2 Items -. , Tablel (Category), 2 , (Items).

92 Borland C++ Builder 6. DBGridl DataSource2. DBLookupComboBoxl

. ListSource DataSourcel, ListField Category, KeyField CategoryNo. , : DBLookupComboBoxl DataSource( Category), Category 1 ( ), DBLookupComboBoxl CategoryNo ( CategoryNo, ( KeyField), .

, : Categor Table] DataSourcel :DBLookupComboBoxl, Items 2 DataSource! DBGridl. , Tablel 2.

2, ;, MasterSource DataSourcel, . < , MasterField Field Link Designer ( ) Available Indexes (). , . ? Items Primary ( ), Category ( ) ItemNDX (- ). Category.

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Available Indexes . Detail Fields , -. Category. Master Fields . ,

Detail Fields Category, Master Fields CategoryNo, Add. Joined Fields (. . 2.18). -

2.

. MasterFields CategoryNo.

, , . -

OnCreate :

void _fastcall TForml::FormCreate(TObject *Sender){

DBLookupComboBoxl->KeyValue=Tablel->Field ByName("CategoryNo")->Value;

} -

DBLookupComboBoxl. , - . KeyValne DBLookupComboBoxl , CategoryNo. CategoryNo Tablel, .

, Active true, - . -

. 2.19. , TDBGrid , - .

BDE, , , , . (Cached Updates Mode) , , ,

, .

,

, MB, ,Dell.MB Del2.MB. , . .

BDE : - (TDatabase), ( TQuery), ( TBDEClientDataSef). .

,

TBDEClientDataSet. - TDatabase (TQuery). TDatabase TBDE-ClientDataSet , - .

,

CachedUpdates true. ( Post) , , ,

(, cache). ,

ApplyUpdates, CancelUpdates.


ApplyUpdates ], , TDatabase, ! , ApplyUpdates CommitUpdate CancelUpdates , , ApplyUpdates CancelUpdati( ).

( 6asi ) - TI.

. , ApplyUpdates .

, ,

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ApplyUpdates CancelUpdates . ,

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TBDEDataSet , - :

typedef void fastcall ( closure *TUpdateRecordEvent)(Db::TDataSet* DataSet, Db::TUpdateKind UpdateKind,TUpdateAction &UpdateAction);

typedef void fastcall ( closure *TUpdateErrorEvent)(Db::TDataSet* DataSet, b::EDatabaseError * E,Db::TUpdateKind UpdateKind, TUpdateAction &Upd'ateAction) ;

, .. ApplyUpdates - . OnUpdateRecord TUpdateRecordEvent , , .

, -

,

.

DataSet, OnUpdateRecord . UpdateKind TUpdateKind, ,

2. 95

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- UpdateAction - OnUpdateRecord. , UpdateAction TUpdateAction. - : uaAbort ( -), uaApplied ( , . . ),uaFail ( , ),uaSkip ( , ). uaRetry ( ), - OnUpdateRecord. , UpdateAction uaFail. , , , -

, .

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OnUpdateRecord UpdateAction uaApplied. - , -

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, ,

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Q (TCheckBox) (TLabef). CBUpdatesPending Caption. : . .

, , .

Q () . ButtonApply , ButtonCancel . - , .

Q - (TLabel). , : LIns : 0, LDel : 0, LMod - : 0, LErr : 0. ,

, .

96 Borland C++ Builder 6. . 2.20.

,

;CBUpdatesPending. Post, AfterPost Table! :

CBUpdatesPending->Checked=Tael->UpdatesPending; Post CBUpdatesPending -

UpdatesPending.

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- CancelUpdates. CBUpdatesPending, CommitUpdates, CancelUpdates . , -

, AfterPost. ButtonApply ButtonCancel

, -

.

NDel, NIns, NMod NErr. Unitl.cpp, :

TForml *Forml; :

int NDel, NIns, NMod, NErr; 0 (

). NDel, NIns, NMod NErr OnUpdateRecord OnUpdateError. . , - OnUpdateRecord UpdateKind , , 1. ,

2. BDE 97 UpdateAction uaApplied. - OnUpdateError 1 NErr, UpdateAction uaAbort.

bins, LDel, LMod LErr - UpdateLabel. NIns, NDel, NMod NErr Caption . , - . , UpdateLabel ButtonApply ButtonCancel.

- 2.7 2.8, . 2.20.

2.5. CachedUpdates11-#ifndef UnitlHdefine UnitlH/ / - .includeincludei ncludeincludeincludeincludeincludeincludei ncludeincludeincludei ncludeinclude/ / . .

class TForml : public TForm

published: // IDE-managed ComponentsTDBGrid DBGridl;TTable *Tablel;TDataSource *Data5ourcel;TButton *ButtonUpdate;TButton *ButtonCancel;TCheckBox *CBUpdatesPending;TPanel *Panell;TPanel *Panel2;TLabel *LIns;TLabel *Label2;TLabel *LDel;TLabel *LMod;TLabel *LErr;void fastcall ButtonUpdateClick(TObject Sender)void fastcall ButtonCancelClick(TObject Sender)void fastcall TablelAfterPost(TDataSet *DataSet)void fastcall TablelUpdateRecord(TDataSet DataSet,TUpdateKind UpdateKind, TUpdateAction &UpdateAction);void fastcall TablelUpdateError(TDataSet *DataSet,EDatabaseError *E, TUpdateKind UpdateKind,

4 . 319


TUpdateAction &UpdateAction) ;void _ fastcall FormCloseQuery(TObject *Sender, bool &CanClose)

private: // User declarationsvoid _ fastcall UpdateLabel(void) ;

public: // User declarations_ fastcall TForml (TComponent* Owner);

extern PACKAGE TForml *Forml;/ / - - -#endif

2.6. CachedUpdates

#include #pragma hdrstop

#include "Unitl.h"

#pragma package(smart_ini t)#pragma resource "*.dfm"TForml *Forml;int NDel, NIns, NMod, NErr;

_fastcall TForml::TForml(TComponent* Owner): TForm(Owner)

NDel=0; NMod=0;NIns=0; NErr=0;

void _ fastcall TForml: :ButtonUpdateClick(TObject Sender){

Tablel->ApplyUpdates() ;Tablel->CommitUpdates() ;CBUpdatesPending->Checked=Tablel->UpdatesPending;

UpdateLabeK) ;

void _ fastcall TForml : :ButtonCancelClick(TObject *5ender){

Tablel->CancelUpdates() ;CBUpdatesPending->Checked=Tablel->UpdatesPending;UpdateLabeK) ;

void _ fastcall TForml : :TablelAfterPost(TDataSet *DataSet){

CBUpda te s Pending->Checked=Tabl el ->Updates Pending;

void _ fastcall TForml : :TablelUpdateRecord(TDataSet *DataSet,TUpdateKind UpdateKind, TUpdateAction &UpdateAction)

2. BDE 99

UpdateAction=uaApplied;switch(UpdateKind)

case ukModify:{ NMod++; break; }case uklnsert:{ NIns++; break;}case ukDelete:{ NDel++; break; }

void fastcall TForml::TablelUpdateError(TDataSet *DataSet,EDatabaseError *E, TUpdateKind UpdateKind,TUpdateAction &UpdateAction)

NErr++;UpdateAction=uaAbort;

void fastcall TForml::UpdateLabel(void)

15->=" : " + IntToStr(NIns);NIns=0;1->11=" : " + IntToStr(NDel);NDel=0;1->=" : " + IntToStr(NMod);NMod=0;LErr->Caption="Oujn6oK : " + IntToStr(NErr);NErr=0;

void fastcall TForml::FormCloseQuery(TObject *Sender, bool &CanClose)if((Tablel->CachedUpdates) && (Tablel->UpdatesPending))

swi tch(Application->MessageBox(" ! ?","!", MB_YESNOCANCEL + MB_ICONQUESTION))

case IDYES:{ Tablel->ApplyUpdates();

Tablel->CommitUpdatesO ;break;}

case IDCANCEL:{ CanClose=false;

break; }case IDNO:{ Tablel->CancelUpdates();

break; }


. , RevertRecord , ! UpdateObject - TUpdateSQL, , . . ! , Using the BDto cache updates C++ Builder.

(Database Desktop ), , .

, , SQL. BDI .

,

, . AddAlia TSession. Session TSession , , BDE. !TSession . STANDARL(Paradox, dBASE, ) AddStandardAlias TSession, AddAHas. , MyDatal Paradox :

if ( !Sess ion->IsAl ias("MyData l" ) ) Session->AddStandardAl ias("MyDatal", " D : \ \ M y D a t a l " , "PARADOX");

AddStandardAlias , , .

AnsiString : "PARADOX""DBASE", "ASCUDRV" ( ). , ,

IsAlias TSession. , . ! , true.

new.

, delete:

* Tablel= new TTable(this);d e l e t e ( T a b l e l ) ; ,

:

Tablel->DatabaseName="MyDatal";Tablel->TableName="Itemsl.db";Tablel->TableType=ttParadox; . -

2. 101

FieldDefs IndexDefs . - , Clear. FieldDefs, AddFieldDef, - TFieldDef. , ,

. Item:NewFieldDef->Name="Item";NewFieldDef->DataType=ftString;NewFieldDef->Size=50;NewFieldDef->Requi red=true; .

MQToaAddlndexDef, TIndexDef. . ,

ItemNo:NewIndexDef->Name="";NewlndexDef->FieIds="ItemNo";NewIndexDef->Options=TIndexOptions() ixPrimary ixUnique

CreateTable. 2.7 - Item, .

2.7. Item

Table* Tablel= new TTable(this);if (!Session->IsAlias("MyDatal"

Session->AddStandardAlias("MyDatal", "D:\\MyDatal", "PARADOX");Tablel->DatabaseName="MyDatal";Tablel->TableName="Itemsl.db";Tablel->TableType=ttParadox;Tablel->FieldDefs->Clear();Tablel->IndexDefs->Clear();TFieldDef* NewFieldDef=Tablel->FieldDefs->AddFieldDef();NewFieldDef->Name="ItemNo";NewFieldDef->DataType=ftAutoInc;NewFieldDef=Tablel->FieldDefs->AddFieldDef();NewFieldDef->Name="Item";NewFieldDef->DataType=ftSt ing;NewFieldDef->Size=50;NewFieldDef->Requi red=true;NewFieldDef=Tablel->FieldDefs->AddFieldDef();NewFieldDef->Name="Category";NewFieldDef->DataType=ftlnteger;NewFieldDef->Requi red=true;NewFieldDef=Tablel->FieldDefs->AddFieldDef();NewFieldDef->Name="Description";


NewFieldDef->DataType=ftString;NewFieldDef->Size=100;NewFieldDef=Tablel->FieldDefs->AddFieldDef();NewFieldDef->Name="Index";NewFieldDef->DataType=ftString;NewFieldDef->Size=5;NewFieldDef->Requi red=true;NewFieldDef=Tablel->FieldDefs->AddFieldDef();NewFieldDef->Name="Price";NewFieldDef->DataType=ftCurency;NewFi eldDef->Required=true;

TIndexDef* NewIndexDef=Tablel->IndexDefs->Add!ndexDef();NewIndexDef->Name="";NewIndexDef->Fields="ItemNo";NewIndexDef->Options=TIndexOptions() ixllnique;NewIndexDef=Tablel->IndexDefs->AddIndexDef();NewIndexDef->Name="ItemNDX";NewIndexDef->Fields="Item";NewIndexDef->Options=TIndexOptions() ixUnique;Tablel->CreateTable();delete(Tablel); BDE

, TSession, TDatabase, TQuery, (Data Controls), .

BDE .

, .

: / , , -, , . ,

TDataSource TField. , TDataSource ! , -

, ..

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, -

. , (Calculated) (Lookup Fields).

(Master/Detail), , , .. .

BDE()

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SQL TQuery TUpdateSQL TBatchMove

Borland Database Engine(BDE) . - .

TDataSmirce TField. - -

BDE. , TDataSet - TQuery. TQuery , . -

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( TDataModule) , . ,

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, TDataSource, TQuery, TDatabase, TSession, TStoredProc .. Data Access,

104 Borland C++ Builder 6. , (BDE, dbExpress, ADCInterBase). , , , , TTimer, TOpenDialog, TSaveDialo^ Dialogs.

,

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. .2. (Diagram), , - Master/Detail

3. BDE () 105

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. Include Unit Hdr File. ->__, ,DModl->Tablel. - . ,

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Diagram . . 3.2 , Master/Detail Category Items.

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DatabaseName . , TDatabase,

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Editl->Text=Tablel->Database->DataSetCount; , MyData Tablel

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TDatabase TDatabase >

(alias). ! ( SQL Explorer BDE Administrator), , AliasName. DatabaseName DatabaseName .

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DriverName, , TDatabase. Params, ( TStrings). Params =. , > (. . ) , Params , - .

-

. STANDARD (Paradox dBASE)INTRBASE MSACCESS :

PATH=d:\MyData //STANDARDSERVER NAME=d:\IBase\MyIBase.gdb //INTRBASEDATABASE NAME=d:\Data\Northwind.mdb / / M S A C C E S S

, .

, Params , ,

, . .

ODBC SQL Links, BDE. , SQL, , , - .

3. () 107

. 3.3. Params TDatabase (Value List editor)

Params, TString, (Value List editor). Params. - , . Key , Value (.. 3.3). Code Editor..., , ,

( =, , ).

TDatabase , . , -

. . 3.4 - TDatabase photodatabase.gdb INTRBASE, Temp D:. TDatabase Name, Alias Name Driver Name. TDatabase DatabaseName, AliasName DriverName. DatabaseName - Name ( ). ( Alias Name), ( Driver Name), , .

j-jMyOOBEammeler overridesSERVER NAME'd\Temp\photodatabase gdbUSER NAME-SYSDBAP*SSWORD=rrmsterkey

Login prampt 17 beep inactive connection

. .4. TDatabase photodatabase.gdb INTRBASE


TDatabase MEMO, c< . ,

(Parameter overrides), Params 061 TDatabase. (, ). , :

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.

.

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true, false, . LoginPrompt false, :, Params ;TDatabase ( ).

, TDatabase ' .

TDatabase , (. ). TDatabase ! Connected. Connected true , false, . , Opei Close .

TDatabast ,

( DatabaseName ). } , , ! : ? - ? KeepConnection true, , () . - TDatabase . ! ,

.

TDatabase , . DataSets DataSetCount - (. . ) ,

3. () 109

TDatabase. . DataSetCount - , a DataSets - ( TDBDataSei). - , DataSetCount DataSets:

Memol->Clear();for (int i = 0; i < Databasel->DataSetCount; i++)

{TTabTe* MyTable;MyTable=dynamic_cast(Databasel->DataSets[i]);if(MyTable) Memol->Lines->Add(MyTable->TableName);}

,

(Memo!), TDatabase (Database!) - . .

, Memol. , Database!. - * (. . , ). , Memol , .

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, .

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. , , -

, , , -

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( ). ( ),


( ). - ().

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Q (Atomicity). - , , -

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(, , ), - , TDatabase.

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(cached updates):Databasel->StartTransaction() ;try{

Tablel->ApplyUpdates() ;Databasel->Commit() ;

}catch (...){

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}Tablel->Commi tUpdatesQ ;

3. ()

, Rollback th-row . ,

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tiDirtyRead . , .

Q tiReadCommitted SQL. (committed) .

Q tiRepeatableRead' . , .

STANDARD (Paradox, dBASE), tiDirtyRead. (ASCIIDRV) .

GetTableNames GetFieldNames TDatabase. :

void fastcall GetTableNames(Classes::TStrings* List,bool SystemTables = false);

void fastcall GetFieldNames(const AnsiString TableName,Classes::TStrings* List);

GetTableNames (TStrings*). TStrings , , TDatabase. (. . Connected false). SystemTables . - true, . (, Microsoft Access, Interbase .) (). SystemTables , .

GetFieldNames . ( AnsiString) . TString* ( ). .

, GetTableNames GetFieldNames, .

( TListView). ( File->New->Data Module) TDatabase. , DModl ( Name). Database! MyData ( - ).

112 Borland C++ Builder 6. Database! Forml, ] . Include Unit Hdr MI File. , (Unit2) . (Unitl) erpi ^include "Uni2.h". , .

ListViewl, , . ,

OnCreate:

void fastcall TForml::FormCreate(TObject *Sender){

DModl->Databasel->GetTableNames(ListBoxl->Iterns);ListBoxl->ItemIndex=0;DModl->Databasel->GetFieldNames(Li stBoxl->Iterns->Strings[ListBoxl->ItemIndex],ListBox2->Items);

} GetTableNames,

Items ListBoxl , Database!'. ( 0) GetFieldNames, Items ListView2 , (. . , ). , Database! -> DModl.

Category

Suppliers

EmployeeNoLNomeFNameMNomeHireDtfeFireDetaDescriptionPhotoBirthday

I

. .5. GetTableNames GetFieldNames

ListView. ListViewl. OnClick TListView. 1

, ; . OnClick ListViewl :

void fastcall TForml::ListBoxlClick(TObject *Sender){

DModl->Databasel->GetFieldNames(ListBoxl->Items->Strings[ListBoxl->ItemIndex] ,ListBox2->Items) ;

3. BDE () 113

, ,

(. . 3.5).

, -

:Access violation at address 00407C59 in module 'PROJECT! F.XE'. , OnCreate DModl. . , -

. Options Project. Project Options Forms. (Auto-create forms). - Form? - , FormJ. - ,

DModl . .

Project View Source. ^Project).. CreateForm Application. , :

Application->CreateForm( classid(TDModl), &DModl);Appl1cation->CreateForm( classld(TForml), &Forml);

TDatabase TDatabase ,

. -

TDatabase OnLogin. BeforeConnect, AfterConnect,BeforeDisconnect AfterDisconnect TCustomConnection, - TDatabase. TNotifyEvent, OnLogin :

typedef void fastcall ( closure *TDatabaseLoginEvent)(TDatabase* Database, Classes::TStrings* LoginParams);

OnLogin , , LoginPrompt true ( ). - ,

, , -

, Params TDatabase. LoginParams, TStrings. , OnLogin INTRBASE:

void fastcall TForml::DatabaselLogin(TDatabase *Database,TStrings *LoginParams)

{LoginParams->Add("USER NAME=SYSDBA");LoginParams->Add("PASSWORD=masterkey");


OnLogin , Params , .

BeforeConnect AfterConnect . -

- , . ,

,

BeforeConnect Params TDatabase. , .

, .

void fastcall TForml::DatabaselBeforeConnect(TObject *Sender){

Databasel->Params->Clear();Databasel->Params->Add("SERVER NAME=" + DBName);Databasel->Par

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