wxWidgets/include/wx/dbtable.h

///////////////////////////////////////////////////////////////////////////////
// Name:        dbtable.h
// Purpose:     Declaration of the wxTable class.
// Author:      Doug Card
// Modified by: George Tasker
// Created:     9.96
// RCS-ID:      $Id$
// 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

// Use this line for wxWindows v1.x
//#include "wx_ver.h"
// Use this line for wxWindows v2.x
#include "wx/version.h"

#if wxMAJOR_VERSION == 2
    #ifdef __GNUG__
    #pragma interface "dbtable.h"
    #endif
#endif

#if wxMAJOR_VERSION == 2
    #include "wx/db.h"
#else
    #include "db.h"
#endif

const int   ROWID_LEN       = 24;  // 18 is the max, 24 is in case it gets larger
const int   DEFAULT_CURSOR  = 0;
const bool  QUERY_ONLY      = TRUE;
const bool  DISABLE_VIEW    = TRUE;

// The following class is used to define a column of a table.
// The wxTable constructor will dynamically allocate as many of
// these as there are columns in the table.  The class derived
// from wxTable must initialize these column definitions in it's
// constructor.  These column definitions provide inf. to the
// wxTable 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 wxColDef
{
public:
    char    ColName[DB_MAX_COLUMN_NAME_LEN+1];  // Column Name
    int     DbDataType;                         // Logical Data Type; e.g. DB_DATA_TYPE_INTEGER
    int     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
};  // wxColDef


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


// Backward compability for Remstar classes.  These
// will eventually go away, so the wxColXxxx classes
// should be used
typedef wxColDef        CcolDef;
typedef wxColDataPtr    CcolDataPtr;


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


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

    // Private member variables
    UDWORD cursorType;

    // Private member functions
    bool bindInsertParams(void);
    bool bindUpdateParams(void);
    bool bindCols(HSTMT cursor);
    bool getRec(UWORD fetchType);
    bool execDelete(const char *pSqlStmt);
    bool execUpdate(const char *pSqlStmt);
    bool query(int queryType, bool forUpdate, bool distinct, char *pSqlStmt = 0);

public:
    // Pointer to the database object this table belongs to
    wxDB     *pDb;

    // 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)

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

    char      tablePath[DB_PATH_MAX];                    // needed for dBase tables

    // Column Definitions
    wxColDef *colDefs;         // Array of wxColDef structures

    // 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 wxTable::Query().  Format: ",tbl,tbl..."

    // Flags
    bool      selectForUpdate;

    // Public member functions
    wxTable(wxDB *pwxDB, const char *tblName, const int nCols,
            const char *qryTblName = 0, bool qryOnly = !QUERY_ONLY, const char *tblPath=NULL);
    virtual ~wxTable();
    bool    Open(void);
    bool    CreateTable(bool attemptDrop=TRUE);
    bool    DropTable(void);
    bool    CreateIndex(const char * idxName, bool unique, int noIdxCols, CidxDef *pIdxDefs, bool attemptDrop=TRUE);
    bool    DropIndex(const char * idxName);
    bool    CloseCursor(HSTMT cursor);
    int     Insert(void);
    bool    Update(void);
    bool    Update(const char *pSqlStmt);
    bool    UpdateWhere(const char *pWhereClause);
    bool    Delete(void);
    bool    DeleteWhere(const char *pWhereClause);
    bool    DeleteMatching(void);
    virtual bool Query(bool forUpdate = FALSE, bool distinct = FALSE);
    bool    QueryBySqlStmt(char *pSqlStmt);
    bool    QueryMatching(bool forUpdate = FALSE, bool distinct = FALSE);
    bool    QueryOnKeyFields(bool forUpdate = FALSE, bool distinct = FALSE);
    bool    GetNext(void)   { return(getRec(SQL_FETCH_NEXT));  }
    bool    operator++(int) { return(getRec(SQL_FETCH_NEXT));  }

    /***** These four functions only work with wxDB instances that are defined  *****
     ***** as not being FwdOnlyCursors                                          *****/
    bool    GetPrev(void);
    bool    operator--(int);
    bool    GetFirst(void);
    bool    GetLast(void);

    bool    IsCursorClosedOnCommit(void);
    bool    IsColNull(int colNo);
    UWORD   GetRowNum(void);
    void    GetSelectStmt(char *pSqlStmt, int typeOfSelect, bool distinct);
    void    GetDeleteStmt(char *pSqlStmt, int typeOfDel, const char *pWhereClause = 0);
    void    GetUpdateStmt(char *pSqlStmt, int typeOfUpd, const char *pWhereClause = 0);
    void    GetWhereClause(char *pWhereClause, int typeOfWhere, const char *qualTableName = 0);
    bool    CanSelectForUpdate(void);
    bool    CanUpdByROWID(void);
    void    ClearMemberVars(void);
    bool    SetQueryTimeout(UDWORD nSeconds);
    void    SetColDefs (int index, const char *fieldName, int dataType, void *pData, int cType,
                        int size, bool keyField = FALSE, bool upd = TRUE,
                        bool insAllow = TRUE, bool derivedCol = FALSE);
    wxColDataPtr*   SetColDefs (wxColInf *colInfs, ULONG numCols);

    HSTMT  *NewCursor(bool setCursor = FALSE, bool bindColumns = TRUE);
    bool    DeleteCursor(HSTMT *hstmtDel);
    void    SetCursor(HSTMT *hstmtActivate = (void **) DEFAULT_CURSOR);
    HSTMT   GetCursor(void) { return(hstmt); }
    ULONG   Count(const char *args="*");
    int     DB_STATUS(void) { return(pDb->DB_STATUS); }
    bool    Refresh(void);
    bool    SetNull(int colNo);
    bool    SetNull(const char *colName);

#ifdef __WXDEBUG__
    ULONG   GetTableID() { return tableID; };
#endif

};  // wxTable

#endif