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Massive cleanup of the code.

Browse Source 
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
This commit is contained in:
George Tasker
2001-02-03 17:52:58 +00:00
parent 5cf34cf07e
commit 049977d042
4 changed files with 385 additions and 241 deletions
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215
samples/db/dbtest.h
View File

@@ -29,17 +29,21 @@ enum DialogModes {mView,mCreate,mEdit,mSearch};
// this seems to be missing, Robert Roebling (?)
#ifndef MAX_PATH
#define MAX_PATH 200
#if defined(__WXMAC__)
#define MAX_PATH 260 /* max. length of full pathname */
#else /* _MAC */
#define MAX_PATH 256 /* max. length of full pathname */
#endif
#endif
// Name of the table to be created/opened
const wxChar CONTACT_TABLE_NAME[] = "contacts";
const wxChar CONTACT_TABLE_NAME[] = "contacts";
// Nuber of columns in the above table
const int CONTACT_NO_COLS = 12; // 0-11
// Number of columns in the CONTACT table
const int CONTACT_NO_COLS = 12; // 0-11
const wxChar PARAM_FILENAME[] = "dbtest.cfg";
// Global structure for holding ODBC connection information
struct wxDbConnectInf DbConnectInf;
enum Language {langENGLISH, langFRENCH, langGERMAN, langSPANISH, langOTHER};
@@ -47,26 +51,23 @@ enum Language {langENGLISH, langFRENCH, langGERMAN, langSPANISH, langOTHER};
class CeditorDlg;
class CparameterDlg;
const wxChar paramFilename[] = "dbtest.cfg";
/*
* This class contains the actual data members that are used for transferring
* data back and forth from the database to the program.
*
* NOTE: The object described in this class is just for example purposes, and has no
* real meaning other than to show each type of field being used by the database
*/
//
// This class contains the actual data members that are used for transferring
// data back and forth from the database to the program.
//
// NOTE: The object described in this class is just for example purposes, and has no
// real meaning other than to show each type of field being used by the database
//
class CstructContact : public wxObject
{
public:
wxChar Name[50+1]; // Contact's name
wxChar Addr1[50+1];
wxChar Addr2[50+1];
wxChar City[25+1];
wxChar State[25+1];
wxChar PostalCode[15+1];
wxChar Country[20+1];
wxChar Name[50+1]; // Contact's name
wxChar Addr1[50+1];
wxChar Addr2[50+1];
wxChar City[25+1];
wxChar State[25+1];
wxChar PostalCode[15+1];
wxChar Country[20+1];
TIMESTAMP_STRUCT JoinDate; // Date on which this person joined the wxWindows project
Language NativeLanguage; // Enumerated type indicating person's native language
bool IsDeveloper; // Is this person a developer for wxWindows, or just a subscriber
@@ -76,49 +77,62 @@ class CstructContact : public wxObject
//
// NOTE: Ccontact inherits wxDbTable, which gives access to all the database functionality
// The Ccontact class derives from wxDbTable, so we have access to all
// of the database table functions and the local memory variables that
// the database classes will store the data into (and read the data from)
// all combined in this one class.
//
class Ccontact : public wxDbTable, public CstructContact
{
private:
// Used to keep track of whether this class had a wxDb instance
// passed in to it or not. If an existing wxDb instance was not
// passed in at Ccontact creation time, then when the Ccontact
// instance is deleted, the connection will be freed as Ccontact
// created its own connection when it was created.
bool freeDbConn;
// Calls wxDbTable::SetColDefs() once for each column that is
// to be associated with some member variable for use with
// this database object.
void SetupColumns();
public:
// Used in places where we need to construct a WHERE clause to
// be passed to the SetWhereClause() function. From example,
// where building the WHERE clause requires using ::Printf()
// to build the string.
wxString whereStr;
wxString qryWhereStr; // Where string returned from the query dialog
// WHERE string returned from the query dialog
wxString qryWhereStr;
Ccontact(wxDb *pwxDb=NULL);
~Ccontact();
void Initialize();
// Contains all the index definitions and calls to wxDbTable::CreateIndex()
// required to create all the indexes we wish to define for this table.
bool CreateIndexes(void);
bool FetchByName(wxChar *name);
// Since we do not wish to have duplicate code blocks all over our program
// for a common query/fetch that we will need to do in many places, we
// include this member function that does it all for us in one place.
bool FetchByName(const wxString &name);
}; // Ccontact class definition
typedef struct Cparameters
{
// The length of these strings were arbitrarily picked, and are
// dependent on the OS and database engine you will be using.
wxChar ODBCSource[100+1];
wxChar UserName[25+1];
wxChar Password[25+1];
wxChar ODBCSource[SQL_MAX_DSN_LENGTH+1];
wxChar UserName[SQL_MAX_USER_NAME_LEN+1];
wxChar Password[SQL_MAX_AUTHSTR_LEN+1];
wxChar DirPath[MAX_PATH+1];
} Cparameters;
// Define a new application type
class DatabaseDemoApp: public wxApp
{
public:
Cparameters params;
bool OnInit();
}; // DatabaseDemoApp
DECLARE_APP(DatabaseDemoApp)
// Define a new frame type
class DatabaseDemoFrame: public wxFrame
{
@@ -137,7 +151,6 @@ class DatabaseDemoFrame: public wxFrame
void OnEditParameters(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void CreateDataTable(bool recreate);
void BuildEditorDialog();
void BuildParameterDialog(wxWindow *parent);
@@ -145,13 +158,73 @@ DECLARE_EVENT_TABLE()
}; // DatabaseDemoFrame
// Define a new application type
class DatabaseDemoApp: public wxApp
{
public:
// These are the parameters that are stored in the "PARAM_FILENAME" file
// that are read in at startup of the program that indicate the connection
// parameters to be used for connecting to the ODBC data source.
Cparameters params;
// Pointer to the main frame used by the App
DatabaseDemoFrame *DemoFrame;
// Pointer to the main database connection used in the program. This
// pointer would normally be used for doing things as database lookups
// for user login names and passwords, getting workstation settings, etc.
//
// ---> IMPORTANT <---
//
// For each database object created which uses this wxDb pointer
// connection to the database, when a CommitTrans() or RollBackTrans()
// will commit or rollback EVERY object which uses this wxDb pointer.
//
// To allow each table object (those derived from wxDbTable) to be
// individually committed or rolled back, you MUST use a different
// instance of wxDb in the constructor of the table. Doing so creates
// more overhead, and will use more database connections (some DBs have
// connection limits...), so use connections sparringly.
//
// It is recommended that one "main" database connection be created for
// the entire program to use for READ-ONLY database accesses, but for each
// table object which will do a CommitTrans() or RollbackTrans() that a
// new wxDb object be created and used for it.
wxDb *READONLY_DB;
// Contains the ODBC connection information used by
// all database connections
wxDbConnectInf *DbConnectInf;
bool OnInit();
// Read/Write ODBC connection parameters to the "PARAM_FILENAME" file
bool ReadParamFile(Cparameters &params);
bool WriteParamFile(Cparameters &params);
void CreateDataTable(bool recreate);
}; // DatabaseDemoApp
DECLARE_APP(DatabaseDemoApp)
// *************************** CeditorDlg ***************************
class CeditorDlg : public wxPanel
{
private:
// Used to indicate whether all of the widget pointers (defined
// below) have been initialized to point to the memory for
// the named widget. Used as a safeguard from using the widget
// before it has been initialized.
bool widgetPtrsSet;
// Used when the EDIT button has been pressed to maintain the
// original name that was displayed in the editor before the
// EDIT button was pressed, so that if CANCEL is pressed, a
// FetchByName() can be done to retrieve the original data
// to repopulate the dialog.
wxString saveName;
// Pointers to all widgets on the dialog
@@ -167,9 +240,16 @@ class CeditorDlg : public wxPanel
wxStaticText *pNativeLangMsg;
public:
// Indicates if the editor dialog has been initialized yet (used to
// help trap if the Initialize() function failed to load all required
// resources or not.
bool initialized;
enum DialogModes mode;
Ccontact *Contact; // this is the table object that will be being manipulated
// Pointer to the wxDbTable instance that is used to manipulate
// the data in memory and in the database
Ccontact *Contact;
CeditorDlg(wxWindow *parent);
@@ -179,14 +259,32 @@ class CeditorDlg : public wxPanel
void OnActivate(bool) {}; // necessary for hot keys
bool Initialize();
// Sets wxStaticText fields to be editable or not depending
// on the current value of 'mode'
void FieldsEditable();
// Sets the editor mode, determining what state widgets
// on the dialog are to be in based on the operation
// being performed.
void SetMode(enum DialogModes m);
// Update/Retrieve data from the widgets on the dialog
bool PutData();
bool GetData();
// Inserts/updates the database with the current data
// retrieved from the editor dialog
bool Save();
// Database functions for changing the data that is to
// be displayed on the dialog. GetNextRec()/GetPrevRec()
// provide database independent methods that do not require
// backward scrolling cursors to obtain the record that
// is prior to the current record in the search sequence.
bool GetNextRec();
bool GetPrevRec();
bool GetRec(wxChar *whereStr);
bool GetRec(const wxString &whereStr);
DECLARE_EVENT_TABLE()
}; // CeditorDlg
@@ -238,9 +336,19 @@ DECLARE_EVENT_TABLE()
class CparameterDlg : public wxDialog
{
private:
// Used to indicate whether all of the widget pointers (defined
// below) have been initialized to point to the memory for
// the named widget. Used as a safeguard from using the widget
// before it has been initialized.
bool widgetPtrsSet;
enum DialogModes mode;
// Have the parameters been saved yet, or do they
// need to be saved to update the params on disk
bool saved;
// Original params
Cparameters savedParamSettings;
// Pointers to all widgets on the dialog
@@ -258,9 +366,16 @@ class CparameterDlg : public wxDialog
void OnCommand(wxWindow& win, wxCommandEvent& event);
void OnActivate(bool) {}; // necessary for hot keys
// Update/Retrieve data from the widgets on the dialog
bool PutData();
bool GetData();
// Stores the defined parameter for connecting to the selected ODBC
// data source to the config file name in "PARAM_FILENAME"
bool Save();
// Populates the 'pParamODBCSourceList' listbox with the names of all
// ODBC datasource defined for use at the current workstation
void FillDataSourceList();
DECLARE_EVENT_TABLE()
@@ -313,13 +428,17 @@ wxChar * const langQRY_BETWEEN = "column BETWEEN value AND value";
class CqueryDlg : public wxDialog
{
private:
wxDbColInf *colInf; // Column inf. returned by db->GetColumns()
wxDbTable *dbTable;
wxChar *masterTableName;
wxChar *pWhere; // A pointer to the storage for the resulting where clause
wxDbColInf *colInf; // Column inf. returned by db->GetColumns()
wxDbTable *dbTable; // generic wxDbTable object for attaching to the table to query
wxChar *masterTableName; // Name of the table that 'dbTable' will be associated with
wxChar *pWhere; // A pointer to the storage for the resulting where clause
wxDb *pDB;
public:
// Used to indicate whether all of the widget pointers (defined
// below) have been initialized to point to the memory for
// the named widget. Used as a safeguard from using the widget
// before it has been initialized.
bool widgetPtrsSet;
// Widget pointers