include/wx/dbtable.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        dbtable.h
   3 // Purpose:     Declaration of the wxDbTable class.
   4 // Author:      Doug Card
   5 // Modified by: George Tasker
   6 //              Bart Jourquin
   7 //              Mark Johnson
   8 // Created:     9.96
   9 // RCS-ID:      $Id$
  10 // Copyright:   (c) 1996 Remstar International, Inc.
  11 // Licence:     wxWindows licence, plus:
  12 // Notice:      This class library and its intellectual design are free of charge for use,
  13 //              modification, enhancement, debugging under the following conditions:
  14 //              1) These classes may only be used as part of the implementation of a
  15 //                 wxWindows-based application
  16 //              2) All enhancements and bug fixes are to be submitted back to the wxWindows
  17 //                 user groups free of all charges for use with the wxWindows library.
  18 //              3) These classes may not be distributed as part of any other class library,
  19 //                 DLL, text (written or electronic), other than a complete distribution of
  20 //                 the wxWindows GUI development toolkit.
  21 ///////////////////////////////////////////////////////////////////////////////
  22
  23 /*
  24 // SYNOPSIS START
  25 // SYNOPSIS STOP
  26 */
  27
  28 #ifndef DBTABLE_DOT_H
  29 #define DBTABLE_DOT_H
  30
  31 #include "wx/version.h"
  32
  33 #ifdef __GNUG__
  34   #pragma interface "dbtable.h"
  35 #endif
  36
  37 #include "wx/db.h"
  38
  39 #include "wx/variant.h"
  40 #include "wx/dbkeyg.h"
  41
  42 const int   wxDB_ROWID_LEN       = 24;  // 18 is the max, 24 is in case it gets larger
  43 const int   wxDB_DEFAULT_CURSOR  = 0;
  44 const bool  wxDB_QUERY_ONLY      = true;
  45 const bool  wxDB_DISABLE_VIEW    = true;
  46
  47 // Used to indicate end of a variable length list of
  48 // column numbers passed to member functions
  49 const int   wxDB_NO_MORE_COLUMN_NUMBERS = -1;
  50
  51 // The following class is used to define a column of a table.
  52 // The wxDbTable constructor will dynamically allocate as many of
  53 // these as there are columns in the table.  The class derived
  54 // from wxDbTable must initialize these column definitions in it's
  55 // constructor.  These column definitions provide inf. to the
  56 // wxDbTable class which allows it to create a table in the data
  57 // source, exchange data between the data source and the C++
  58 // object, and so on.
  59 class WXDLLEXPORT wxDbColDef
  60 {
  61 public:
  62     wxChar  ColName[DB_MAX_COLUMN_NAME_LEN+1];  // Column Name
  63     int     DbDataType;                         // Logical Data Type; e.g. DB_DATA_TYPE_INTEGER
  64     SWORD   SqlCtype;                           // C data type; e.g. SQL_C_LONG
  65     void   *PtrDataObj;                         // Address of the data object
  66     int     SzDataObj;                          // Size, in bytes, of the data object
  67     bool    KeyField;                           // true if this column is part of the PRIMARY KEY to the table; Date fields should NOT be KeyFields.
  68     bool    Updateable;                         // Specifies whether this column is updateable
  69     bool    InsertAllowed;                      // Specifies whether this column should be included in an INSERT statement
  70     bool    DerivedCol;                         // Specifies whether this column is a derived value
  71     SDWORD  CbValue;                            // Internal use only!!!
  72     bool    Null;                               // NOT FULLY IMPLEMENTED - Allows NULL values in Inserts and Updates
  73
  74     wxDbColDef();
  75
  76     bool    Initialize();
  77 };  // wxDbColDef
  78
  79
  80 class WXDLLEXPORT wxDbColDataPtr
  81 {
  82 public:
  83     void    *PtrDataObj;
  84     int      SzDataObj;
  85     SWORD    SqlCtype;
  86 };  // wxDbColDataPtr
  87
  88
  89 // This structure is used when creating secondary indexes.
  90 class WXDLLEXPORT wxDbIdxDef
  91 {
  92 public:
  93     wxChar  ColName[DB_MAX_COLUMN_NAME_LEN+1];
  94     bool    Ascending;
  95 };  // wxDbIdxDef
  96
  97
  98 class WXDLLEXPORT wxDbTable
  99 {
 100 private:
 101     ULONG       tableID;  // Used for debugging.  This can help to match up mismatched constructors/destructors
 102
 103     // Private member variables
 104     UDWORD      cursorType;
 105     bool        insertable;
 106
 107     // Private member functions
 108     bool        initialize(wxDb *pwxDb, const wxString &tblName, const UWORD numColumns,
 109                        const wxString &qryTblName, bool qryOnly, const wxString &tblPath);
 110     void        cleanup();
 111
 112     bool        bindParams(bool forUpdate);  // called by the other 'bind' functions
 113     bool        bindInsertParams(void);
 114     bool        bindUpdateParams(void);
 115
 116     bool        bindCols(HSTMT cursor);
 117     bool        getRec(UWORD fetchType);
 118     bool        execDelete(const wxString &pSqlStmt);
 119     bool        execUpdate(const wxString &pSqlStmt);
 120     bool        query(int queryType, bool forUpdate, bool distinct, const wxString &pSqlStmt=wxEmptyString);
 121
 122 #if !wxODBC_BACKWARD_COMPATABILITY
 123 // these were public
 124     // Where, Order By and From clauses
 125     wxString    where;               // Standard SQL where clause, minus the word WHERE
 126     wxString    orderBy;             // Standard SQL order by clause, minus the ORDER BY
 127     wxString    from;                // Allows for joins in a wxDbTable::Query().  Format: ",tbl,tbl..."
 128
 129     // ODBC Handles
 130     HENV        henv;           // ODBC Environment handle
 131     HDBC        hdbc;           // ODBC DB Connection handle
 132     HSTMT       hstmt;          // ODBC Statement handle
 133     HSTMT      *hstmtDefault;   // Default cursor
 134     HSTMT       hstmtInsert;    // ODBC Statement handle used specifically for inserts
 135     HSTMT       hstmtDelete;    // ODBC Statement handle used specifically for deletes
 136     HSTMT       hstmtUpdate;    // ODBC Statement handle used specifically for updates
 137     HSTMT       hstmtInternal;  // ODBC Statement handle used internally only
 138     HSTMT      *hstmtCount;     // ODBC Statement handle used by Count() function (No binding of columns)
 139
 140     // Flags
 141     bool        selectForUpdate;
 142
 143     // Pointer to the database object this table belongs to
 144     wxDb       *pDb;
 145
 146     // Table Inf.
 147     wxString    tablePath;                                 // needed for dBase tables
 148     wxString    tableName;                                 // Table name
 149     wxString    queryTableName;                            // Query Table Name
 150     UWORD       noCols;                                    // # of columns in the table
 151     bool        queryOnly;                                 // Query Only, no inserts, updates or deletes
 152
 153     // Column Definitions
 154     wxDbColDef *colDefs;         // Array of wxDbColDef structures
 155 #endif
 156 public:
 157 #if wxODBC_BACKWARD_COMPATABILITY
 158     // Where, Order By and From clauses
 159     char       *where;          // Standard SQL where clause, minus the word WHERE
 160     char       *orderBy;        // Standard SQL order by clause, minus the ORDER BY
 161     char       *from;           // Allows for joins in a wxDbTable::Query().  Format: ",tbl,tbl..."
 162
 163     // ODBC Handles
 164     HENV        henv;           // ODBC Environment handle
 165     HDBC        hdbc;           // ODBC DB Connection handle
 166     HSTMT       hstmt;          // ODBC Statement handle
 167     HSTMT      *hstmtDefault;   // Default cursor
 168     HSTMT       hstmtInsert;    // ODBC Statement handle used specifically for inserts
 169     HSTMT       hstmtDelete;    // ODBC Statement handle used specifically for deletes
 170     HSTMT       hstmtUpdate;    // ODBC Statement handle used specifically for updates
 171     HSTMT       hstmtInternal;  // ODBC Statement handle used internally only
 172     HSTMT      *hstmtCount;     // ODBC Statement handle used by Count() function (No binding of columns)
 173
 174     // Flags
 175     bool        selectForUpdate;
 176
 177     // Pointer to the database object this table belongs to
 178     wxDb       *pDb;
 179
 180     // Table Inf.
 181     char        tablePath[wxDB_PATH_MAX];                  // needed for dBase tables
 182     char        tableName[DB_MAX_TABLE_NAME_LEN+1];        // Table name
 183     char        queryTableName[DB_MAX_TABLE_NAME_LEN+1];   // Query Table Name
 184     UWORD       noCols;                                    // # of columns in the table
 185     bool        queryOnly;                                 // Query Only, no inserts, updates or deletes
 186
 187     // Column Definitions
 188     wxDbColDef *colDefs;         // Array of wxDbColDef structures
 189 #endif
 190     // Public member functions
 191     wxDbTable(wxDb *pwxDb, const wxString &tblName, const UWORD numColumns,
 192               const wxString &qryTblName="", bool qryOnly = !wxDB_QUERY_ONLY,
 193               const wxString &tblPath="");
 194
 195     // DEPRECATED
 196     wxDbTable(wxDb *pwxDb, const wxString &tblName, const UWORD numColumns,
 197               const wxChar *qryTblName="", bool qryOnly = !wxDB_QUERY_ONLY,
 198               const wxString &tblPath="");
 199
 200     virtual ~wxDbTable();
 201
 202     bool            Open(bool checkPrivileges=false, bool checkTableExists=true);
 203     bool            CreateTable(bool attemptDrop=true);
 204     bool            DropTable(void);
 205     bool            CreateIndex(const wxString &idxName, bool unique, UWORD noIdxCols,
 206                                 wxDbIdxDef *pIdxDefs, bool attemptDrop=true);
 207     bool            DropIndex(const wxString &idxName);
 208
 209     // Accessors
 210
 211     // The member variables returned by these accessors are all
 212     // set when the wxDbTable instance is created and cannot be
 213     // changed, hence there is no corresponding SetXxxx function
 214     wxDb           *GetDb()              { return pDb; }
 215     const wxString &GetTableName()       { return tableName; }
 216     const wxString &GetQueryTableName()  { return queryTableName; }
 217     const wxString &GetTablePath()       { return tablePath; }
 218
 219     UWORD           GetNumberOfColumns() { return noCols; }  // number of "defined" columns for this wxDbTable instance
 220
 221     const wxString &GetFromClause()      { return from; }
 222     const wxString &GetOrderByClause()   { return orderBy; }
 223     const wxString &GetWhereClause()     { return where; }
 224
 225     bool            IsQueryOnly()        { return queryOnly; }
 226 #if wxODBC_BACKWARD_COMPATABILITY
 227     void            SetFromClause(const char *From) { from = (char *)From; }
 228     void            SetOrderByClause(const char *OrderBy) { orderBy = (char *)OrderBy; }
 229     void            SetWhereClause(const char *Where) { where = (char *)Where; }
 230 #else
 231     void            SetFromClause(const wxString &From) { from = From; }
 232     void            SetOrderByClause(const wxString &OrderBy) { orderBy = OrderBy; }
 233     bool            SetOrderByColNums(UWORD first, ...);
 234     void            SetWhereClause(const wxString &Where) { where = Where; }
 235     void            From(const wxString &From) { from = From; }
 236     void            OrderBy(const wxString &OrderBy) { orderBy = OrderBy; }
 237     void            Where(const wxString &Where) { where = Where; }
 238     const wxString &Where()   { return where; }
 239     const wxString &OrderBy() { return orderBy; }
 240     const wxString &From()    { return from; }
 241 #endif
 242     int             Insert(void);
 243     bool            Update(void);
 244     bool            Update(const wxString &pSqlStmt);
 245     bool            UpdateWhere(const wxString &pWhereClause);
 246     bool            Delete(void);
 247     bool            DeleteWhere(const wxString &pWhereClause);
 248     bool            DeleteMatching(void);
 249     virtual bool    Query(bool forUpdate = false, bool distinct = false);
 250     bool            QueryBySqlStmt(const wxString &pSqlStmt);
 251     bool            QueryMatching(bool forUpdate = false, bool distinct = false);
 252     bool            QueryOnKeyFields(bool forUpdate = false, bool distinct = false);
 253     bool            Refresh(void);
 254     bool            GetNext(void)   { return(getRec(SQL_FETCH_NEXT));  }
 255     bool            operator++(int) { return(getRec(SQL_FETCH_NEXT));  }
 256
 257     /***** These four functions only work with wxDb instances that are defined  *****
 258      ***** as not being FwdOnlyCursors                                          *****/
 259     bool            GetPrev(void);
 260     bool            operator--(int);
 261     bool            GetFirst(void);
 262     bool            GetLast(void);
 263
 264     bool            IsCursorClosedOnCommit(void);
 265     UWORD           GetRowNum(void);
 266
 267     void            BuildSelectStmt(wxString &pSqlStmt, int typeOfSelect, bool distinct);
 268     void            BuildSelectStmt(wxChar *pSqlStmt, int typeOfSelect, bool distinct);
 269
 270     void            BuildDeleteStmt(wxString &pSqlStmt, int typeOfDel, const wxString &pWhereClause="");
 271     void            BuildDeleteStmt(wxChar *pSqlStmt, int typeOfDel, const wxString &pWhereClause="");
 272
 273     void            BuildUpdateStmt(wxString &pSqlStmt, int typeOfUpd, const wxString &pWhereClause="");
 274     void            BuildUpdateStmt(wxChar *pSqlStmt, int typeOfUpd, const wxString &pWhereClause="");
 275
 276     void            BuildWhereClause(wxString &pWhereClause, int typeOfWhere, const wxString &qualTableName="", bool useLikeComparison=false);
 277     void            BuildWhereClause(wxChar *pWhereClause, int typeOfWhere, const wxString &qualTableName="", bool useLikeComparison=false);
 278
 279 #if wxODBC_BACKWARD_COMPATABILITY
 280 // The following member functions are deprecated.  You should use the BuildXxxxxStmt functions (above)
 281     void            GetSelectStmt(char *pSqlStmt, int typeOfSelect, bool distinct)
 282                            { BuildSelectStmt(pSqlStmt,typeOfSelect,distinct); }
 283     void            GetDeleteStmt(char *pSqlStmt, int typeOfDel, const char *pWhereClause = NULL)
 284                            { BuildDeleteStmt(pSqlStmt,typeOfDel,pWhereClause); }
 285     void            GetUpdateStmt(char *pSqlStmt, int typeOfUpd, const char *pWhereClause = NULL)
 286                            { BuildUpdateStmt(pSqlStmt,typeOfUpd,pWhereClause); }
 287     void            GetWhereClause(char *pWhereClause, int typeOfWhere,
 288                                    const char *qualTableName = NULL, bool useLikeComparison=false)
 289                            { BuildWhereClause(pWhereClause,typeOfWhere,qualTableName,useLikeComparison); }
 290 #endif
 291     bool            CanSelectForUpdate(void);
 292     bool            CanUpdByROWID(void);
 293     void            ClearMemberVar(UWORD colNo, bool setToNull=false);
 294     void            ClearMemberVars(bool setToNull=false);
 295     bool            SetQueryTimeout(UDWORD nSeconds);
 296
 297     wxDbColDef     *GetColDefs() { return colDefs; }
 298     void            SetColDefs(UWORD index, const wxString &fieldName, int dataType,
 299                                void *pData, SWORD cType,
 300                                int size, bool keyField = false, bool upd = true,
 301                                bool insAllow = true, bool derivedCol = false);
 302     wxDbColDataPtr *SetColDefs(wxDbColInf *colInfs, UWORD numCols);
 303
 304     bool            CloseCursor(HSTMT cursor);
 305     bool            DeleteCursor(HSTMT *hstmtDel);
 306     void            SetCursor(HSTMT *hstmtActivate = (void **) wxDB_DEFAULT_CURSOR);
 307     HSTMT           GetCursor(void) { return(hstmt); }
 308     HSTMT          *GetNewCursor(bool setCursor = false, bool bindColumns = true);
 309 #if wxODBC_BACKWARD_COMPATABILITY
 310 // The following member function is deprecated.  You should use the GetNewCursor
 311     HSTMT          *NewCursor(bool setCursor = false, bool bindColumns = true) {  return GetNewCursor(setCursor,bindColumns); }
 312 #endif
 313
 314     ULONG           Count(const wxString &args="*");
 315     int             DB_STATUS(void) { return(pDb->DB_STATUS); }
 316
 317     bool            IsColNull(UWORD colNo) const;
 318     bool            SetColNull(UWORD colNo, bool set=true);
 319     bool            SetColNull(const wxString &colName, bool set=true);
 320 #if wxODBC_BACKWARD_COMPATABILITY
 321 // The following member functions are deprecated.  You should use the SetColNull()
 322     bool            SetNull(int colNo, bool set=true) { return (SetNull(colNo,set)); }
 323     bool            SetNull(const char *colName, bool set=true) { return (SetNull(colName,set)); }
 324 #endif
 325 #ifdef __WXDEBUG__
 326     ULONG           GetTableID() { return tableID; }
 327 #endif
 328
 329 //TODO: Need to Document
 330     typedef     enum  { WX_ROW_MODE_QUERY , WX_ROW_MODE_INDIVIDUAL } rowmode_t;
 331     virtual     void         SetRowMode(const rowmode_t rowmode);
 332     virtual     wxVariant    GetCol(const int Colno) const ;
 333     virtual     void         SetCol(const int ColNo, const wxVariant value);
 334     virtual     GenericKey   GetKey(void);
 335     virtual     void         SetKey(const GenericKey &key);
 336
 337     private:
 338         HSTMT      *m_hstmtGridQuery;
 339         rowmode_t   m_rowmode;
 340         size_t      m_keysize;
 341
 342 //      typedef enum {unmodified=0, UpdatePending, InsertPending } recStatus;
 343
 344 //      recStatus  get_ModifiedStatus() { return m_recstatus; }
 345
 346 //      void modify() {
 347 //          if (m_recstatus==unmodified)
 348 //              m_recstatus=UpdatePending;
 349 //      }
 350 //  protected:
 351 //      void insertify() {m_recstatus=InsertPending; }
 352 //      void unmodify() {m_recstatus=unmodified; }
 353 //      recStatus m_recstatus;
 354 //TODO: Need to Document
 355 };  // wxDbTable
 356
 357
 358 // Change this to 0 to remove use of all deprecated functions
 359 #if wxODBC_BACKWARD_COMPATABILITY
 360 //#################################################################################
 361 //############### DEPRECATED functions for backward compatability #################
 362 //#################################################################################
 363
 364 // Backward compability.  These will eventually go away
 365 typedef wxDbTable       wxTable;
 366 typedef wxDbIdxDef      wxIdxDef;
 367 typedef wxDbIdxDef      CidxDef;
 368 typedef wxDbColDef      wxColDef;
 369 typedef wxDbColDef      CcolDef;
 370 typedef wxDbColDataPtr  wxColDataPtr;
 371 typedef wxDbColDataPtr  CcolDataPtr;
 372
 373 const int   ROWID           = wxDB_ROWID_LEN;
 374 const int   DEFAULT_CURSOR  = wxDB_DEFAULT_CURSOR;
 375 const bool  QUERY_ONLY      = wxDB_QUERY_ONLY;
 376 const bool  DISABLE_VIEW    = wxDB_DISABLE_VIEW;
 377 #endif
 378
 379 #endif