/////////////////////////////////////////////////////////////////////////////// // 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 #endif //WX_PRECOMP #include 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 char *GetExtendedDBErrorMsg2(wxDb *pDb, char *ErrFile, int ErrLine) { static wxString msg; msg = wxT(""); wxString tStr; if (ErrFile || ErrLine) { msg += wxT("File: "); msg += ErrFile; msg += wxT(" Line: "); tStr.Printf(wxT("%d"),ErrLine); msg += tStr.c_str(); msg += wxT("\n"); } msg.Append (wxT("\nODBC errors:\n")); msg += wxT("\n"); // Display errors for this connection int i; for (i = 0; i < DB_MAX_ERROR_HISTORY; i++) { if (pDb->errorList[i]) { msg.Append(pDb->errorList[i]); if (wxStrcmp(pDb->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(pDb->errorList[i],wxT("")); } } msg += wxT("\n"); return 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 lookup = new Clookup(tableName, colName, pDb, defDir); if (!lookup) { 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->GetCount()) 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 lookup2 = new Clookup2(tableName, dispCol1, dispCol2, pDb, defDir); if (!lookup2) { 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(pDb,__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->GetCount()) 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 **********************************