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wxWidgets/samples/db/listdb.cpp
George Tasker 049977d042 Massive cleanup of the code. 
More Unicode support added (though untested).
Added TONS of comments
Changed code to demonstrate the new wxDbConnectInf class
ODBC environment handle now managed via the wxDbConnectInf class
Fixed bug where editing a displayed record would not save if the user name was changed.
Other minor bug fixes


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9276 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
2001-02-03 17:52:58 +00:00

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///////////////////////////////////////////////////////////////////////////////
// Name: listdb.cpp
// Purpose: Data table lookup listbox code
// Author: George Tasker/Doug Card
// Modified by:
// Created: 1996
// RCS-ID: $Id$
// Copyright: (c) 1996 Remstar International, Inc.
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
/*
// SYNOPSIS START
Member functions for the classes defined in LISTDB.H
This class is used to present a generic ListBox lookup window for
use with any of the object creation/selection choice widgets. This
dialog window will present a (possibly) scrolling list of values
that come from a data table source. Based on the object type passed
in the constructor, a ListBox is built to present the user with a
single selection listbox.
The string selected from the list box is stored in the Global variable
"ListDB_Selection", and will remain set until another interation of this
routine is called.
For each object (database) type that is to be used, an overridden
constructor should be written to appropriately link to the proper
data table/object for building the list.
The data table record access is all handled through the routines
in this module, interfacing with the methods defined in wxDbTable.
All objects which use data table access must be initialized and
have opened the table prior to passing them in the dialog
constructor, and the 'where' query should already have been set
and performed before creating this dialog instance.
// SYNOPSIS STOP
*/
#ifdef __GNUG__
#pragma implementation "listdb.h"
#endif
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif //__BORLANDC__
#ifndef WX_PRECOMP
#include <wx/wx.h>
#endif //WX_PRECOMP
#include <wx/dbtable.h>
extern wxDbList WXDLLEXPORT *PtrBegDbList; /* from db.cpp, used in getting back error results from db connections */
#include "listdb.h"
//#include "dbtest.h"
// Used for passing the selected listbox selection back to the calling
// routine. This variable must be declared as 'extern' in the calling
// source module
wxChar ListDB_Selection[LOOKUP_COL_LEN+1];
// If the listbox contains two columns of data, the second column is
// returned in this variable.
wxChar ListDB_Selection2[LOOKUP_COL_LEN+1];
// Constants
const int LISTDB_NO_SPACES_BETWEEN_COLS = 3;
extern wxApp *DatabaseDemoApp;
/*
* This function will return the exact string(s) from the database engine
* indicating all error conditions which have just occured during the
* last call to the database engine.
*
* This demo uses the returned string by displaying it in a wxMessageBox. The
* formatting therefore is not the greatest, but this is just a demo, not a
* finished product. :-) gt
*
* NOTE: The value returned by this function is for temporary use only and
* should be copied for long term use
*/
const wxChar *GetExtendedDBErrorMsg2(wxChar *ErrFile, int ErrLine)
{
static wxString msg;
msg.Empty();
wxString tStr;
if (ErrFile || ErrLine)
{
msg += wxT("File: ");
msg += ErrFile;
msg += wxT(" Line: ");
tStr.Printf(wxT("%d"),ErrLine);
msg += tStr;
msg += wxT("\n");
}
msg.Append (wxT("\nODBC errors:\n"));
msg += wxT("\n");
/* Scan through each database connection displaying
* any ODBC errors that have occured. */
wxDbList *pDbList;
for (pDbList = PtrBegDbList; pDbList; pDbList = pDbList->PtrNext)
{
// Skip over any free connections
if (pDbList->Free)
continue;
// Display errors for this connection
for (int i = 0; i < DB_MAX_ERROR_HISTORY; i++)
{
if (pDbList->PtrDb->errorList[i])
{
msg.Append(pDbList->PtrDb->errorList[i]);
if (wxStrcmp(pDbList->PtrDb->errorList[i],wxT("")) != 0)
msg.Append(wxT("\n"));
// Clear the errmsg buffer so the next error will not
// end up showing the previous error that have occurred
wxStrcpy(pDbList->PtrDb->errorList[i],wxT(""));
}
}
}
msg += wxT("\n");
return /*(wxChar*) (const wxChar*) msg*/msg.c_str();
} // GetExtendedDBErrorMsg
// Clookup constructor
Clookup::Clookup(wxChar *tblName, wxChar *colName, wxDb *pDb, const wxString &defDir)
: wxDbTable(pDb, tblName, 1, wxT(""), !wxDB_QUERY_ONLY,
defDir)
{
SetColDefs (0, colName, DB_DATA_TYPE_VARCHAR, lookupCol, SQL_C_CHAR, LOOKUP_COL_LEN+1, FALSE, FALSE);
} // Clookup()
// Clookup2 constructor
Clookup2::Clookup2(wxChar *tblName, wxChar *colName1, wxChar *colName2,
wxDb *pDb, const wxString &defDir)
: wxDbTable(pDb, tblName, (1 + (wxStrlen(colName2) > 0)), wxT(""),
!wxDB_QUERY_ONLY, defDir)
{
wxASSERT(pDb);
wxASSERT(tblName);
wxASSERT(colName1);
wxASSERT(colName2);
int i = 0;
SetColDefs (i, colName1, DB_DATA_TYPE_VARCHAR, lookupCol1, SQL_C_CHAR, LOOKUP_COL_LEN+1, FALSE, FALSE);
if (wxStrlen(colName2) > 0)
SetColDefs (++i, colName2, DB_DATA_TYPE_VARCHAR, lookupCol2, SQL_C_CHAR, LOOKUP_COL_LEN+1, FALSE, FALSE);
} // Clookup2()
BEGIN_EVENT_TABLE(ClookUpDlg, wxDialog)
EVT_BUTTON(LOOKUP_DIALOG_OK, ClookUpDlg::OnButton)
EVT_BUTTON(LOOKUP_DIALOG_CANCEL, ClookUpDlg::OnButton)
EVT_CLOSE(ClookUpDlg::OnClose)
END_EVENT_TABLE()
// This is a generic lookup constructor that will work with any table and any column
ClookUpDlg::ClookUpDlg(wxWindow *parent, wxChar *windowTitle, wxChar *tableName,
wxChar *colName, wxChar *where, wxChar *orderBy,
wxDb *pDb, const wxString &defDir)
: wxDialog (parent, LOOKUP_DIALOG, wxT("Select..."), wxPoint(-1, -1), wxSize(400, 290))
{
wxBeginBusyCursor();
wxStrcpy(ListDB_Selection,wxT(""));
widgetPtrsSet = FALSE;
lookup = 0;
lookup2 = 0;
noDisplayCols = 1;
col1Len = 0;
pLookUpSelectList = new wxListBox(this, LOOKUP_DIALOG_SELECT, wxPoint( 5, 15), wxSize(384, 195), 0, 0, wxLB_SINGLE|wxLB_ALWAYS_SB, wxDefaultValidator, wxT("LookUpSelectList"));
pLookUpOkBtn = new wxButton(this, LOOKUP_DIALOG_OK, wxT("&Ok"), wxPoint(113, 222), wxSize( 70, 35), 0, wxDefaultValidator, wxT("LookUpOkBtn"));
pLookUpCancelBtn = new wxButton(this, LOOKUP_DIALOG_CANCEL, wxT("C&ancel"), wxPoint(212, 222), wxSize( 70, 35), 0, wxDefaultValidator, wxT("LookUpCancelBtn"));
widgetPtrsSet = TRUE;
// Query the lookup table and display the result set
if (!(lookup = new Clookup(tableName, colName, pDb, defDir)))
{
wxMessageBox(wxT("Error allocating memory for 'Clookup'object."),wxT("Error..."));
Close();
return;
}
if (!lookup->Open())
{
wxString tStr;
tStr.Printf(wxT("Unable to open the table '%s'."),tableName);
wxMessageBox(tStr,wxT("ODBC Error..."));
Close();
return;
}
lookup->SetOrderByClause(orderBy);
lookup->SetWhereClause(where);
if (!lookup->Query())
{
wxMessageBox(wxT("ODBC error during Query()"),wxT("ODBC Error..."));
Close();
return;
}
// Fill in the list box from the query result set
while (lookup->GetNext())
pLookUpSelectList->Append(lookup->lookupCol);
// Highlight the first list item
pLookUpSelectList->SetSelection(0);
// Make the OK activate by pressing Enter
if (pLookUpSelectList->Number())
pLookUpOkBtn->SetDefault();
else
{
pLookUpCancelBtn->SetDefault();
pLookUpOkBtn->Enable(FALSE);
}
// Display the dialog window
SetTitle(windowTitle);
Centre(wxBOTH);
wxEndBusyCursor();
ShowModal();
} // Generic lookup constructor
//
// This is a generic lookup constructor that will work with any table and any column.
// It extends the capabilites of the lookup dialog in the following ways:
//
// 1) 2 columns rather than one
// 2) The ability to select DISTINCT column values
//
// Only set distinctValues equal to true if necessary. In many cases, the constraints
// of the index(es) will enforce this uniqueness. Selecting DISTINCT does require
// overhead by the database to ensure that all values returned are distinct. Therefore,
// use this ONLY when you need it.
//
// For complicated queries, you can pass in the sql select statement. This would be
// necessary if joins are involved since by default both columns must come from the
// same table.
//
// If you do query by sql statement, you must pass in the maximum lenght of column1,
// since it cannot be derived when you query using your own sql statement.
//
// The optional database connection can be used if you'd like the lookup class
// to use a database pointer other than wxGetApp().READONLY_DB. This is necessary if
// records are being saved, but not committed to the db, yet should be included
// in the lookup window.
//
ClookUpDlg::ClookUpDlg(wxWindow *parent, wxChar *windowTitle, wxChar *tableName,
wxChar *dispCol1, wxChar *dispCol2, wxChar *where, wxChar *orderBy,
wxDb *pDb, const wxString &defDir, bool distinctValues,
wxChar *selectStmt, int maxLenCol1, bool allowOk)
: wxDialog (parent, LOOKUP_DIALOG, wxT("Select..."), wxPoint(-1, -1), wxSize(400, 290))
{
wxBeginBusyCursor();
wxStrcpy(ListDB_Selection,wxT(""));
wxStrcpy(ListDB_Selection2,wxT(""));
widgetPtrsSet = FALSE;
lookup = 0;
lookup2 = 0;
noDisplayCols = (wxStrlen(dispCol2) ? 2 : 1);
col1Len = 0;
wxFont fixedFont(12,wxMODERN,wxNORMAL,wxNORMAL);
// this is done with fixed font so that the second column (if any) will be left
// justified in the second column
pLookUpSelectList = new wxListBox(this, LOOKUP_DIALOG_SELECT, wxPoint(5, 15), wxSize(384, 195), 0, 0, wxLB_SINGLE|wxLB_ALWAYS_SB, wxDefaultValidator, wxT("LookUpSelectList"));
pLookUpSelectList->SetFont(fixedFont);
pLookUpOkBtn = new wxButton(this, LOOKUP_DIALOG_OK, wxT("&Ok"), wxPoint(113, 222), wxSize(70, 35), 0, wxDefaultValidator, wxT("LookUpOkBtn"));
pLookUpCancelBtn = new wxButton(this, LOOKUP_DIALOG_CANCEL, wxT("C&ancel"), wxPoint(212, 222), wxSize(70, 35), 0, wxDefaultValidator, wxT("LookUpCancelBtn"));
widgetPtrsSet = TRUE;
// Query the lookup table and display the result set
if (!(lookup2 = new Clookup2(tableName, dispCol1, dispCol2, pDb, defDir)))
{
wxMessageBox(wxT("Error allocating memory for 'Clookup2' object."),wxT("Error..."));
Close();
return;
}
if (!lookup2->Open())
{
wxString tStr;
tStr.Printf(wxT("Unable to open the table '%s'."),tableName);
tStr += GetExtendedDBErrorMsg2(__FILE__,__LINE__);
wxMessageBox(tStr,wxT("ODBC Error..."));
Close();
return;
}
// If displaying 2 columns, determine the maximum length of column1
int maxColLen;
if (maxLenCol1)
maxColLen = col1Len = maxLenCol1; // user passed in max col length for column 1
else
{
maxColLen = LOOKUP_COL_LEN;
if (wxStrlen(dispCol2))
{
wxString q = wxT("SELECT MAX({fn LENGTH(");
q += dispCol1;
q += wxT(")}), NULL");
q += wxT(" FROM ");
q += tableName;
if (wxStrlen(where))
{
q += wxT(" WHERE ");
q += where;
}
if (!lookup2->QueryBySqlStmt(q))
{
wxMessageBox(wxT("ODBC error during QueryBySqlStmt()"),wxT("ODBC Error..."));
Close();
return;
}
if (lookup2->GetNext())
maxColLen = col1Len = atoi(lookup2->lookupCol1);
else
wxMessageBox(wxT("ODBC error during GetNext()"),wxT("ODBC Error..."));
}
}
// Query the actual record set
if (selectStmt && wxStrlen(selectStmt)) // Query by sql stmt passed in
{
if (!lookup2->QueryBySqlStmt(selectStmt))
{
wxMessageBox(wxT("ODBC error during QueryBySqlStmt()"),wxT("ODBC Error..."));
Close();
return;
}
}
else // Query using where and order by clauses
{
lookup2->SetOrderByClause(orderBy);
lookup2->SetWhereClause(where);
if (!lookup2->Query(FALSE, distinctValues))
{
wxMessageBox(wxT("ODBC error during Query()"),wxT("ODBC Error..."));
Close();
return;
}
}
// Fill in the list box from the query result set
wxString s;
while (lookup2->GetNext())
{
s = lookup2->lookupCol1;
if (wxStrlen(dispCol2)) // Append the optional column 2
{
s.Append(wxT(' '), (maxColLen + LISTDB_NO_SPACES_BETWEEN_COLS - wxStrlen(lookup2->lookupCol1)));
s.Append(lookup2->lookupCol2);
}
pLookUpSelectList->Append(s);
}
// Highlight the first list item
pLookUpSelectList->SetSelection(0);
// Make the OK activate by pressing Enter
if (pLookUpSelectList->Number())
pLookUpOkBtn->SetDefault();
else
{
pLookUpCancelBtn->SetDefault();
pLookUpOkBtn->Enable(FALSE);
}
pLookUpOkBtn->Enable(allowOk);
// Display the dialog window
SetTitle(windowTitle);
Centre(wxBOTH);
wxEndBusyCursor();
ShowModal();
} // Generic lookup constructor 2
void ClookUpDlg::OnClose(wxCloseEvent& event)
{
widgetPtrsSet = FALSE;
GetParent()->Enable(TRUE);
if (lookup)
delete lookup;
if (lookup2)
delete lookup2;
SetReturnCode(1);
while (wxIsBusy()) wxEndBusyCursor();
event.Skip();
// return TRUE;
} // ClookUpDlg::OnClose
void ClookUpDlg::OnButton( wxCommandEvent &event )
{
wxWindow *win = (wxWindow*) event.GetEventObject();
OnCommand( *win, event );
}
void ClookUpDlg::OnCommand(wxWindow& win, wxCommandEvent& event)
{
wxString widgetName = win.GetName();
if (widgetPtrsSet)
{
// OK Button
if (widgetName == pLookUpOkBtn->GetName())
{
if (pLookUpSelectList->GetSelection() != -1)
{
if (noDisplayCols == 1)
wxStrcpy (ListDB_Selection, pLookUpSelectList->GetStringSelection());
else // 2 display columns
{
wxString s = pLookUpSelectList->GetStringSelection();
// Column 1
s = s.SubString(0, col1Len-1);
s = s.Strip();
wxStrcpy(ListDB_Selection, s);
// Column 2
s = pLookUpSelectList->GetStringSelection();
s = s.Mid(col1Len + LISTDB_NO_SPACES_BETWEEN_COLS);
s = s.Strip();
wxStrcpy(ListDB_Selection2, s);
}
}
else
{
wxStrcpy(ListDB_Selection,wxT(""));
wxStrcpy(ListDB_Selection2,wxT(""));
}
Close();
} // OK Button
// Cancel Button
if (widgetName == pLookUpCancelBtn->GetName())
{
wxStrcpy (ListDB_Selection,wxT(""));
wxStrcpy (ListDB_Selection2,wxT(""));
Close();
} // Cancel Button
}
}; // ClookUpDlg::OnCommand
// *********************************** listdb.cpp **********************************
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