dbtable.h

浙江大学的悟空嵌入式系统模拟器

///////////////////////////////////////////////////////////////////////////////
// Name:        dbtable.h
// Purpose:     Declaration of the wxDbTable class.
// Author:      Doug Card
// Modified by: George Tasker
//              Bart Jourquin
//              Mark Johnson
// Created:     9.96
// RCS-ID:      $Id: dbtable.h,v 1.1 2005/03/16 06:48:51 kehc Exp $
// Copyright:   (c) 1996 Remstar International, Inc.
// Licence:     wxWindows licence, plus:
// Notice:      This class library and its intellectual design are free of charge for use,
//              modification, enhancement, debugging under the following conditions:
//              1) These classes may only be used as part of the implementation of a
//                 wxWindows-based application
//              2) All enhancements and bug fixes are to be submitted back to the wxWindows
//                 user groups free of all charges for use with the wxWindows library.
//              3) These classes may not be distributed as part of any other class library,
//                 DLL, text (written or electronic), other than a complete distribution of
//                 the wxWindows GUI development toolkit.
///////////////////////////////////////////////////////////////////////////////

/*
// SYNOPSIS START
// SYNOPSIS STOP
*/

#ifndef DBTABLE_DOT_H
#define DBTABLE_DOT_H

#include "wx/version.h"

#if defined(__GNUG__) && !defined(__APPLE__)
  #pragma interface "dbtable.h"
#endif

#include "wx/db.h"

#include "wx/variant.h"
#include "wx/dbkeyg.h"

const int   wxDB_ROWID_LEN       = 24;  // 18 is the max, 24 is in case it gets larger
const int   wxDB_DEFAULT_CURSOR  = 0;
const bool  wxDB_QUERY_ONLY      = TRUE;
const bool  wxDB_DISABLE_VIEW    = TRUE;

// Used to indicate end of a variable length list of
// column numbers passed to member functions
const int   wxDB_NO_MORE_COLUMN_NUMBERS = -1;

// The following class is used to define a column of a table.
// The wxDbTable constructor will dynamically allocate as many of
// these as there are columns in the table.  The class derived
// from wxDbTable must initialize these column definitions in it's
// constructor.  These column definitions provide inf. to the
// wxDbTable class which allows it to create a table in the data
// source, exchange data between the data source and the C++
// object, and so on.
class WXDLLEXPORT wxDbColDef
{
public:
    wxChar  ColName[DB_MAX_COLUMN_NAME_LEN+1];  // Column Name
    int     DbDataType;                         // Logical Data Type; e.g. DB_DATA_TYPE_INTEGER
    SWORD   SqlCtype;                           // C data type; e.g. SQL_C_LONG
    void   *PtrDataObj;                         // Address of the data object
    int     SzDataObj;                          // Size, in bytes, of the data object
    bool    KeyField;                           // TRUE if this column is part of the PRIMARY KEY to the table; Date fields should NOT be KeyFields.
    bool    Updateable;                         // Specifies whether this column is updateable
    bool    InsertAllowed;                      // Specifies whether this column should be included in an INSERT statement
    bool    DerivedCol;                         // Specifies whether this column is a derived value
    SDWORD  CbValue;                            // Internal use only!!!
    bool    Null;                               // NOT FULLY IMPLEMENTED - Allows NULL values in Inserts and Updates

    wxDbColDef();

    bool    Initialize();
};  // wxDbColDef


class WXDLLEXPORT wxDbColDataPtr
{
public:
    void    *PtrDataObj;
    int      SzDataObj;
    SWORD    SqlCtype;
};  // wxDbColDataPtr


// This structure is used when creating secondary indexes.
class WXDLLEXPORT wxDbIdxDef
{
public:
    wxChar  ColName[DB_MAX_COLUMN_NAME_LEN+1];
    bool    Ascending;
};  // wxDbIdxDef


class WXDLLEXPORT wxDbTable
{
private:
    ULONG       tableID;  // Used for debugging.  This can help to match up mismatched constructors/destructors

    // Private member variables
    UDWORD      cursorType;
    bool        insertable;

    // Private member functions
    bool        initialize(wxDb *pwxDb, const wxString &tblName, const UWORD numColumns,
                       const wxString &qryTblName, bool qryOnly, const wxString &tblPath);
    void        cleanup();

    bool        bindParams(bool forUpdate);  // called by the other 'bind' functions
    bool        bindInsertParams(void);
    bool        bindUpdateParams(void);

    bool        bindCols(HSTMT cursor);
    bool        getRec(UWORD fetchType);
    bool        execDelete(const wxString &pSqlStmt);
    bool        execUpdate(const wxString &pSqlStmt);
    bool        query(int queryType, bool forUpdate, bool distinct, const wxString &pSqlStmt=wxEmptyString);

#if !wxODBC_BACKWARD_COMPATABILITY
// these were public
    // Where, Order By and From clauses
    wxString    where;               // Standard SQL where clause, minus the word WHERE
    wxString    orderBy;             // Standard SQL order by clause, minus the ORDER BY
    wxString    from;                // Allows for joins in a wxDbTable::Query().  Format: ",tbl,tbl..."

    // ODBC Handles
    HENV        henv;           // ODBC Environment handle
    HDBC        hdbc;           // ODBC DB Connection handle
    HSTMT       hstmt;          // ODBC Statement handle
    HSTMT      *hstmtDefault;   // Default cursor
    HSTMT       hstmtInsert;    // ODBC Statement handle used specifically for inserts
    HSTMT       hstmtDelete;    // ODBC Statement handle used specifically for deletes
    HSTMT       hstmtUpdate;    // ODBC Statement handle used specifically for updates
    HSTMT       hstmtInternal;  // ODBC Statement handle used internally only
    HSTMT      *hstmtCount;     // ODBC Statement handle used by Count() function (No binding of columns)

    // Flags
    bool        selectForUpdate;

    // Pointer to the database object this table belongs to
    wxDb       *pDb;

    // Table Inf.
    wxString    tablePath;                                 // needed for dBase tables
    wxString    tableName;                                 // Table name
    wxString    queryTableName;                            // Query Table Name
    UWORD       noCols;                                    // # of columns in the table
    bool        queryOnly;                                 // Query Only, no inserts, updates or deletes

    // Column Definitions
    wxDbColDef *colDefs;         // Array of wxDbColDef structures
#endif
public:
#if wxODBC_BACKWARD_COMPATABILITY
    // Where, Order By and From clauses
    char       *where;          // Standard SQL where clause, minus the word WHERE
    char       *orderBy;        // Standard SQL order by clause, minus the ORDER BY
    char       *from;           // Allows for joins in a wxDbTable::Query().  Format: ",tbl,tbl..."

    // ODBC Handles
    HENV        henv;           // ODBC Environment handle
    HDBC        hdbc;           // ODBC DB Connection handle
    HSTMT       hstmt;          // ODBC Statement handle
    HSTMT      *hstmtDefault;   // Default cursor
    HSTMT       hstmtInsert;    // ODBC Statement handle used specifically for inserts
    HSTMT       hstmtDelete;    // ODBC Statement handle used specifically for deletes
    HSTMT       hstmtUpdate;    // ODBC Statement handle used specifically for updates
    HSTMT       hstmtInternal;  // ODBC Statement handle used internally only
    HSTMT      *hstmtCount;     // ODBC Statement handle used by Count() function (No binding of columns)

    // Flags
    bool        selectForUpdate;

    // Pointer to the database object this table belongs to
    wxDb       *pDb;

    // Table Inf.
    char        tablePath[wxDB_PATH_MAX];                  // needed for dBase tables
    char        tableName[DB_MAX_TABLE_NAME_LEN+1];        // Table name
    char        queryTableName[DB_MAX_TABLE_NAME_LEN+1];   // Query Table Name
    UWORD       noCols;                                    // # of columns in the table
    bool        queryOnly;                                 // Query Only, no inserts, updates or deletes

    // Column Definitions
    wxDbColDef *colDefs;         // Array of wxDbColDef structures
#endif
    // Public member functions