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DOS/V Power Report 1997 May
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NDXREBU.CPP
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C/C++ Source or Header
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1997-02-14
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5KB
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151 lines
//----------------------------------------------------------------------------
//Borland C++Builder
//Copyright (c) 1987, 1997 Borland International Inc. All Rights Reserved.
//----------------------------------------------------------------------------
#include <vcl\vcl.h>
#pragma hdrstop
#include "ndxrebu.h"
//---------------------------------------------------------------------------
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormCreate(TObject *Sender)
{
// Set up the exception handler.
Application->OnException = HandleExceptions;
// Populate the Alias drop down with the currently defined aliases.
Screen->Cursor = crHourGlass;
try {
Session->GetAliasNames(cbAlias->Items);
cbAlias->ItemIndex = 0;
}
catch (...) {} // dummy catch block to guarantee we get here.
Screen->Cursor = crDefault;
// Now, get the table name for the first index in the list.
cbAliasChange(NULL);
}
//---------------------------------------------------------------------
void __fastcall TForm1::HandleExceptions(TObject *Sender, Exception *E)
{
if (E->Message.Length())
{
Screen->Cursor = crArrow;
MessageDlg(E->Message, mtError, TMsgDlgButtons() << mbOK, 0);
}
}
void __fastcall TForm1::cbAliasChange(TObject *Sender)
{
// Get the tables in the new index.
Screen->Cursor = crHourGlass;
try {
Session->GetTableNames(cbAlias->Items->Strings[cbAlias->ItemIndex],
"", True, False, cbTable->Items);
cbTable->Items->Insert(0, "<All Tables>");
cbTable->ItemIndex = 0;
}
catch (...) {} // dummy catch block to guarantee we get here.
Screen->Cursor = crDefault;
}
//---------------------------------------------------------------------
void __fastcall TForm1::BitBtn1Click(TObject *Sender)
{
AnsiString strTable;
int Counter;
int iNTables;
AnsiString strError;
char strMsg[1024];
strError = "";
if (cbTable->ItemIndex > 0)
{
if (!RebuildIndexes(cbAlias->Items->Strings[cbAlias->ItemIndex],
cbTable->Items->Strings[cbTable->ItemIndex],
strError)) {
wsprintf(strMsg,
"Unable to rebuild indexes for %s. Reason: %s",
cbTable->Items->Strings[cbTable->ItemIndex].c_str(),
strError.c_str());
MessageDlg(strMsg, mtError, TMsgDlgButtons() << mbOK, 0);
}
}
else
{
iNTables = cbTable->Items->Count;
for (Counter = 1; Counter <= cbTable->Items->Count - 1; Counter++) {
StatusBar1->Panels->Items[1]->Text = AnsiString(iNTables - Counter);
StatusBar1->Update();
if (!RebuildIndexes(cbAlias->Items->Strings[cbAlias->ItemIndex],
cbTable->Items->Strings[Counter],
strError)){
wsprintf(strMsg,
"Unable to rebuild indexes for %s. Reason: %s",
cbTable->Items->Strings[Counter].c_str(),
strError.c_str());
MessageDlg(strMsg, mtError, TMsgDlgButtons() << mbOK, 0 );
}
}
StatusBar1->Panels->Items[1]->Text = " ";
StatusBar1->Update();
}
}
//---------------------------------------------------------------------
bool __fastcall TForm1::RebuildIndexes(AnsiString strAlias, AnsiString strTable,
AnsiString& strError)
{
bool Result = False;
DBIResult bdeResult;
if (tblIndex->Active) tblIndex->Active = False;
tblIndex->DatabaseName = strAlias;
tblIndex->TableName = strTable;
Screen->Cursor = crHourGlass;
try {
WriteMsg("Opening " + strTable + "...");
tblIndex->Open();
}
catch (...) {}
Screen->Cursor = crDefault;
if (!tblIndex->Active)
strError = "The table could not be opened exclusively. It is " \
"probably being used by another user or application.";
else {
WriteMsg("Regenerating indexes for " + strTable + "...");
Screen->Cursor = crHourGlass;
try {
bdeResult = DbiRegenIndexes(tblIndex->Handle);
switch (bdeResult) {
case DBIERR_NONE: Result = True; break;
case DBIERR_INVALIDHNDL: strError = "Invalid table handle."; break;
case DBIERR_NEEDEXCLACCESS: strError = "Table is open in shared mode."; break;
case DBIERR_NOTSUPPORTED: strError = "Remote indexes cannot be rebuilt."; break;
default: strError = "Unexpected Error Returned by BDE.";
}
}
catch (...) {}
Screen->Cursor = crDefault;
}
WriteMsg("");
return Result;
}
void __fastcall TForm1::WriteMsg(AnsiString strWrite)
{
StatusBar1->Panels->Items[0]->Text = strWrite;
StatusBar1->Update();
}