include/wx/db.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        db.h
   3 // Purpose:     Header file wxDB class.  The wxDB class represents a connection
   4 //              to an ODBC data source.  The wxDB class allows operations on the data
   5 //              source such as opening and closing the data source.
   6 // Author:      Doug Card
   7 // Modified by:
   8 // Mods:        Dec, 1998:
   9 //                -Added support for SQL statement logging and database cataloging
  10 //                                       April, 1999
  11 //                                              -Added QUERY_ONLY mode support to reduce default number of cursors
  12 //                                              -Added additional SQL logging code
  13 //                -Added DEBUG-ONLY tracking of Ctable objects to detect orphaned DB connections
  14 //                                              -Set ODBC option to only read committed writes to the DB so all
  15 //                   databases operate the same in that respect
  16 //
  17 // Created:     9.96
  18 // RCS-ID:      $Id$
  19 // Copyright:   (c) 1996 Remstar International, Inc.
  20 // Licence:     wxWindows licence, plus:
  21 // Notice:               This class library and its intellectual design are free of charge for use,
  22 //              modification, enhancement, debugging under the following conditions:
  23 //              1) These classes may only be used as part of the implementation of a
  24 //                 wxWindows-based application
  25 //              2) All enhancements and bug fixes are to be submitted back to the wxWindows
  26 //                 user groups free of all charges for use with the wxWindows library.
  27 //              3) These classes may not be distributed as part of any other class library,
  28 //                 DLL, text (written or electronic), other than a complete distribution of
  29 //                 the wxWindows GUI development toolkit.
  30 //
  31 ///////////////////////////////////////////////////////////////////////////////
  32
  33 /*
  34 // SYNOPSIS START
  35 // SYNOPSIS STOP
  36 */
  37
  38 #ifndef DB_DOT_H
  39 #define DB_DOT_H
  40
  41 // Use this line for wxWindows v1.x
  42 //#include "wx_ver.h"
  43 // Use this line for wxWindows v2.x
  44 #include "wx/version.h"
  45
  46 #if wxMAJOR_VERSION == 2
  47         #ifdef __GNUG__
  48         #pragma interface "db.h"
  49         #endif
  50 #endif
  51
  52 #if defined(wx_msw) || defined(__WXMSW__) || defined(WIN32)
  53 #include <windows.h>
  54 #endif
  55
  56 #ifdef __UNIX__
  57 #if wxMAJOR_VERSION == 2
  58         extern "C" {
  59         #include "../../src/iodbc/isql.h"
  60         #include "../../src/iodbc/isqlext.h"
  61         }
  62 #else  // version == 1
  63         extern "C" {
  64         #include "iodbc.h"
  65         #include "isqlext.h"
  66         }
  67 #endif
  68         typedef float SFLOAT;
  69         typedef double SDOUBLE;
  70         typedef unsigned int UINT;
  71         #define ULONG UDWORD
  72 #elif defined(__WXMAC__)
  73         extern "C" {
  74         #include "../../src/iodbc/isql.h"
  75         #include "../../src/iodbc/isqlext.h"
  76         }
  77         typedef float SFLOAT;
  78         typedef double SDOUBLE;
  79         typedef unsigned int UINT;
  80         #define ULONG UDWORD
  81 #else  // msw
  82         #define ODBCVER 0x0250
  83         #include <sql.h>
  84         #include <sqlext.h>
  85 #endif
  86
  87 #ifdef __UNIX__
  88 #   ifndef strnicmp
  89 #      define strnicmp strncasecmp
  90 #   endif
  91 #   ifndef stricmp
  92 #      define stricmp strcasecmp
  93 #   endif
  94 #elif defined(__WXMAC__)
  95 #else
  96 #   include <io.h>
  97 #endif
  98
  99 enum            enumDummy               {enumDum1};
 100
 101 #define SQL_C_BOOLEAN(datatype) (sizeof(datatype) == 1 ? SQL_C_UTINYINT : (sizeof(datatype) == 2 ? SQL_C_USHORT : SQL_C_ULONG))
 102 //      #define SQL_C_BOOLEAN (sizeof(Bool) == 2 ? SQL_C_USHORT : SQL_C_ULONG)
 103
 104 #define SQL_C_ENUM (sizeof(enumDummy) == 2 ? SQL_C_USHORT : SQL_C_ULONG)
 105
 106 #ifndef TRUE
 107 #define TRUE 1
 108 #endif
 109
 110 #ifndef FALSE
 111 #define FALSE 0
 112 #endif
 113
 114 const int DB_PATH_MAX                                                   = 254;
 115
 116 // Database Globals
 117 const int DB_TYPE_NAME_LEN                                              = 40;
 118 const int DB_MAX_STATEMENT_LEN                          = 2048;
 119 const int DB_MAX_WHERE_CLAUSE_LEN                       = 1024;
 120 const int DB_MAX_ERROR_MSG_LEN                          = 512;
 121 const int DB_MAX_ERROR_HISTORY                          = 5;
 122 const int DB_MAX_TABLE_NAME_LEN                         = 128;
 123 const int DB_MAX_COLUMN_NAME_LEN                                = 128;
 124
 125 const int DB_DATA_TYPE_VARCHAR                          = 1;
 126 const int DB_DATA_TYPE_INTEGER                          = 2;
 127 const int DB_DATA_TYPE_FLOAT                                    = 3;
 128 const int DB_DATA_TYPE_DATE                                     = 4;
 129
 130 const int DB_SELECT_KEYFIELDS                                   = 1;
 131 const int DB_SELECT_WHERE                                               = 2;
 132 const int DB_SELECT_MATCHING                                    = 3;
 133 const int DB_SELECT_STATEMENT                                   = 4;
 134
 135 const int DB_UPD_KEYFIELDS                                              = 1;
 136 const int DB_UPD_WHERE                                                  = 2;
 137
 138 const int DB_DEL_KEYFIELDS                                              = 1;
 139 const int DB_DEL_WHERE                                                  = 2;
 140 const int DB_DEL_MATCHING                                               = 3;
 141
 142 const int DB_WHERE_KEYFIELDS                                    = 1;
 143 const int DB_WHERE_MATCHING                                     = 2;
 144
 145 const int DB_GRANT_SELECT                                               = 1;
 146 const int DB_GRANT_INSERT                                               = 2;
 147 const int DB_GRANT_UPDATE                                               = 4;
 148 const int DB_GRANT_DELETE                                               = 8;
 149 const int DB_GRANT_ALL                                                  = DB_GRANT_SELECT | DB_GRANT_INSERT | DB_GRANT_UPDATE | DB_GRANT_DELETE;
 150
 151 // ODBC Error codes (derived from ODBC SqlState codes)
 152 enum ODBC_ERRORS
 153 {
 154         DB_FAILURE                                                                              = 0,
 155         DB_SUCCESS                                                                              = 1,
 156         DB_ERR_NOT_IN_USE,
 157         DB_ERR_GENERAL_WARNING,                                                                 // SqlState = '01000'
 158         DB_ERR_DISCONNECT_ERROR,                                                                // SqlState = '01002'
 159         DB_ERR_DATA_TRUNCATED,                                                                  // SqlState = '01004'
 160         DB_ERR_PRIV_NOT_REVOKED,                                                                // SqlState = '01006'
 161         DB_ERR_INVALID_CONN_STR_ATTR,                                                   // SqlState = '01S00'
 162         DB_ERR_ERROR_IN_ROW,                                                                            // SqlState = '01S01'
 163         DB_ERR_OPTION_VALUE_CHANGED,                                                    // SqlState = '01S02'
 164         DB_ERR_NO_ROWS_UPD_OR_DEL,                                                              // SqlState = '01S03'
 165         DB_ERR_MULTI_ROWS_UPD_OR_DEL,                                                   // SqlState = '01S04'
 166         DB_ERR_WRONG_NO_OF_PARAMS,                                                              // SqlState = '07001'
 167         DB_ERR_DATA_TYPE_ATTR_VIOL,                                                     // SqlState = '07006'
 168         DB_ERR_UNABLE_TO_CONNECT,                                                               // SqlState = '08001'
 169         DB_ERR_CONNECTION_IN_USE,                                                               // SqlState = '08002'
 170         DB_ERR_CONNECTION_NOT_OPEN,                                                     // SqlState = '08003'
 171         DB_ERR_REJECTED_CONNECTION,                                                     // SqlState = '08004'
 172         DB_ERR_CONN_FAIL_IN_TRANS,                                                              // SqlState = '08007'
 173         DB_ERR_COMM_LINK_FAILURE,                                                               // SqlState = '08S01'
 174         DB_ERR_INSERT_VALUE_LIST_MISMATCH,                                      // SqlState = '21S01'
 175         DB_ERR_DERIVED_TABLE_MISMATCH,                                          // SqlState = '21S02'
 176         DB_ERR_STRING_RIGHT_TRUNC,                                                              // SqlState = '22001'
 177         DB_ERR_NUMERIC_VALUE_OUT_OF_RNG,                                                // SqlState = '22003'
 178         DB_ERR_ERROR_IN_ASSIGNMENT,                                                     // SqlState = '22005'
 179         DB_ERR_DATETIME_FLD_OVERFLOW,                                                   // SqlState = '22008'
 180         DB_ERR_DIVIDE_BY_ZERO,                                                                  // SqlState = '22012'
 181         DB_ERR_STR_DATA_LENGTH_MISMATCH,                                                // SqlState = '22026'
 182         DB_ERR_INTEGRITY_CONSTRAINT_VIOL,                                       // SqlState = '23000'
 183         DB_ERR_INVALID_CURSOR_STATE,                                                    // SqlState = '24000'
 184         DB_ERR_INVALID_TRANS_STATE,                                                     // SqlState = '25000'
 185         DB_ERR_INVALID_AUTH_SPEC,                                                               // SqlState = '28000'
 186         DB_ERR_INVALID_CURSOR_NAME,                                                     // SqlState = '34000'
 187         DB_ERR_SYNTAX_ERROR_OR_ACCESS_VIOL,                                     // SqlState = '37000'
 188         DB_ERR_DUPLICATE_CURSOR_NAME,                                                   // SqlState = '3C000'
 189         DB_ERR_SERIALIZATION_FAILURE,                                                   // SqlState = '40001'
 190         DB_ERR_SYNTAX_ERROR_OR_ACCESS_VIOL2,                            // SqlState = '42000'
 191         DB_ERR_OPERATION_ABORTED,                                                               // SqlState = '70100'
 192         DB_ERR_UNSUPPORTED_FUNCTION,                                                    // SqlState = 'IM001'
 193         DB_ERR_NO_DATA_SOURCE,                                                                  // SqlState = 'IM002'
 194         DB_ERR_DRIVER_LOAD_ERROR,                                                               // SqlState = 'IM003'
 195         DB_ERR_SQLALLOCENV_FAILED,                                                              // SqlState = 'IM004'
 196         DB_ERR_SQLALLOCCONNECT_FAILED,                                          // SqlState = 'IM005'
 197         DB_ERR_SQLSETCONNECTOPTION_FAILED,                                      // SqlState = 'IM006'
 198         DB_ERR_NO_DATA_SOURCE_DLG_PROHIB,                                       // SqlState = 'IM007'
 199         DB_ERR_DIALOG_FAILED,                                                                   // SqlState = 'IM008'
 200         DB_ERR_UNABLE_TO_LOAD_TRANSLATION_DLL,                          // SqlState = 'IM009'
 201         DB_ERR_DATA_SOURCE_NAME_TOO_LONG,                                       // SqlState = 'IM010'
 202         DB_ERR_DRIVER_NAME_TOO_LONG,                                                    // SqlState = 'IM011'
 203         DB_ERR_DRIVER_KEYWORD_SYNTAX_ERROR,                                     // SqlState = 'IM012'
 204         DB_ERR_TRACE_FILE_ERROR,                                                                // SqlState = 'IM013'
 205         DB_ERR_TABLE_OR_VIEW_ALREADY_EXISTS,                            // SqlState = 'S0001'
 206         DB_ERR_TABLE_NOT_FOUND,                                                                 // SqlState = 'S0002'
 207         DB_ERR_INDEX_ALREADY_EXISTS,                                                    // SqlState = 'S0011'
 208         DB_ERR_INDEX_NOT_FOUND,                                                                 // SqlState = 'S0012'
 209         DB_ERR_COLUMN_ALREADY_EXISTS,                                                   // SqlState = 'S0021'
 210         DB_ERR_COLUMN_NOT_FOUND,                                                                // SqlState = 'S0022'
 211         DB_ERR_NO_DEFAULT_FOR_COLUMN,                                                   // SqlState = 'S0023'
 212         DB_ERR_GENERAL_ERROR,                                                                   // SqlState = 'S1000'
 213         DB_ERR_MEMORY_ALLOCATION_FAILURE,                                       // SqlState = 'S1001'
 214         DB_ERR_INVALID_COLUMN_NUMBER,                                                   // SqlState = 'S1002'
 215         DB_ERR_PROGRAM_TYPE_OUT_OF_RANGE,                                       // SqlState = 'S1003'
 216         DB_ERR_SQL_DATA_TYPE_OUT_OF_RANGE,                                      // SqlState = 'S1004'
 217         DB_ERR_OPERATION_CANCELLED,                                                     // SqlState = 'S1008'
 218         DB_ERR_INVALID_ARGUMENT_VALUE,                                          // SqlState = 'S1009'
 219         DB_ERR_FUNCTION_SEQUENCE_ERROR,                                         // SqlState = 'S1010'
 220         DB_ERR_OPERATION_INVALID_AT_THIS_TIME,                          // SqlState = 'S1011'
 221         DB_ERR_INVALID_TRANS_OPERATION_CODE,                            // SqlState = 'S1012'
 222         DB_ERR_NO_CURSOR_NAME_AVAIL,                                                    // SqlState = 'S1015'
 223         DB_ERR_INVALID_STR_OR_BUF_LEN,                                          // SqlState = 'S1090'
 224         DB_ERR_DESCRIPTOR_TYPE_OUT_OF_RANGE,                            // SqlState = 'S1091'
 225         DB_ERR_OPTION_TYPE_OUT_OF_RANGE,                                                // SqlState = 'S1092'
 226         DB_ERR_INVALID_PARAM_NO,                                                                // SqlState = 'S1093'
 227         DB_ERR_INVALID_SCALE_VALUE,                                                     // SqlState = 'S1094'
 228         DB_ERR_FUNCTION_TYPE_OUT_OF_RANGE,                                      // SqlState = 'S1095'
 229         DB_ERR_INF_TYPE_OUT_OF_RANGE,                                                   // SqlState = 'S1096'
 230         DB_ERR_COLUMN_TYPE_OUT_OF_RANGE,                                                // SqlState = 'S1097'
 231         DB_ERR_SCOPE_TYPE_OUT_OF_RANGE,                                         // SqlState = 'S1098'
 232         DB_ERR_NULLABLE_TYPE_OUT_OF_RANGE,                                      // SqlState = 'S1099'
 233         DB_ERR_UNIQUENESS_OPTION_TYPE_OUT_OF_RANGE,             // SqlState = 'S1100'
 234         DB_ERR_ACCURACY_OPTION_TYPE_OUT_OF_RANGE,                       // SqlState = 'S1101'
 235         DB_ERR_DIRECTION_OPTION_OUT_OF_RANGE,                           // SqlState = 'S1103'
 236         DB_ERR_INVALID_PRECISION_VALUE,                                         // SqlState = 'S1104'
 237         DB_ERR_INVALID_PARAM_TYPE,                                                              // SqlState = 'S1105'
 238         DB_ERR_FETCH_TYPE_OUT_OF_RANGE,                                         // SqlState = 'S1106'
 239         DB_ERR_ROW_VALUE_OUT_OF_RANGE,                                          // SqlState = 'S1107'
 240         DB_ERR_CONCURRENCY_OPTION_OUT_OF_RANGE,                 // SqlState = 'S1108'
 241         DB_ERR_INVALID_CURSOR_POSITION,                                         // SqlState = 'S1109'
 242         DB_ERR_INVALID_DRIVER_COMPLETION,                                       // SqlState = 'S1110'
 243         DB_ERR_INVALID_BOOKMARK_VALUE,                                          // SqlState = 'S1111'
 244         DB_ERR_DRIVER_NOT_CAPABLE,                                                              // SqlState = 'S1C00'
 245         DB_ERR_TIMEOUT_EXPIRED                                                                  // SqlState = 'S1T00'
 246 };
 247
 248 struct DbStuff
 249 {
 250         HENV Henv;
 251         char Dsn[SQL_MAX_DSN_LENGTH+1];                         // Data Source Name
 252         char Uid[20+1];                                                                 // User ID
 253         char AuthStr[20+1];                                                             // Authorization string (password)
 254
 255         char description[SQL_MAX_DSN_LENGTH+1]; // Not sure what the max length is
 256         char fileType[SQL_MAX_DSN_LENGTH+1];            // Not sure what the max length is
 257
 258         // Optionals needed for some databases like dBase
 259         char defaultDir[DB_PATH_MAX];                                   // Directory that db file resides in
 260 };
 261
 262 typedef struct
 263 {
 264         char    TypeName[DB_TYPE_NAME_LEN];
 265         int     FsqlType;
 266         long    Precision;
 267         short   CaseSensitive;
 268 //      short MinimumScale;
 269         short MaximumScale;
 270 } SqlTypeInfo;
 271
 272 class WXDLLEXPORT CcolInf
 273 {
 274 public:
 275         char tableName[DB_MAX_TABLE_NAME_LEN+1];
 276         char colName[DB_MAX_COLUMN_NAME_LEN+1];
 277         int  sqlDataType;
 278 };
 279
 280 enum sqlLog
 281 {
 282         sqlLogOFF,
 283         sqlLogON
 284 };
 285
 286 enum dbms
 287 {
 288         dbmsUNIDENTIFIED,
 289         dbmsORACLE,
 290         dbmsSYBASE_ASA,         // Adaptive Server Anywhere
 291         dbmsSYBASE_ASE,         // Adaptive Server Enterprise
 292         dbmsMS_SQL_SERVER,
 293         dbmsMY_SQL,
 294         dbmsPOSTGRES,
 295         dbmsACCESS,
 296         dbmsDBASE,
 297         dbmsINFORMIX
 298 };
 299
 300 typedef enum dbms DBMS;
 301
 302 // The wxDB::errorList is copied to this variable when the wxDB object
 303 // is closed.  This way, the error list is still available after the
 304 // database object is closed.  This is necessary if the database
 305 // connection fails so the calling application can show the operator
 306 // why the connection failed.  Note: as each wxDB object is closed, it
 307 // will overwrite the errors of the previously destroyed wxDB object in
 308 // this variable.
 309 extern char DBerrorList[DB_MAX_ERROR_HISTORY][DB_MAX_ERROR_MSG_LEN];
 310
 311 class WXDLLEXPORT wxDB
 312 {
 313 private:
 314
 315         // Private data
 316         bool                    dbIsOpen;
 317         char                    *dsn;                           // Data source name
 318         char                    *uid;                           // User ID
 319         char                    *authStr;               // Authorization string (password)
 320         FILE                    *fpSqlLog;              // Sql Log file pointer
 321         enum sqlLog sqlLogState;        // On or Off
 322
 323         // Private member functions
 324         bool getDbInfo(void);
 325         bool getDataTypeInfo(SWORD fSqlType, SqlTypeInfo &structSQLTypeInfo);
 326         bool setConnectionOptions(void);
 327         void logError(char *errMsg, char *SQLState);
 328
 329 public:
 330
 331         // The following structure contains database information gathered from the
 332         // datasource when the datasource is first opened.
 333         struct
 334         {
 335                 char   dbmsName[40];                                                            // Name of the dbms product
 336                 char   dbmsVer[64];                                                             // Version # of the dbms product
 337                 char   driverName[40];                                                  // Driver name
 338                 char   odbcVer[60];                                                             // ODBC version of the driver
 339                 char   drvMgrOdbcVer[60];                                               // ODBC version of the driver manager
 340                 char   driverVer[60];                                                   // Driver version
 341                 char   serverName[80];                                                  // Server Name, typically a connect string
 342                 char     databaseName[128];                                             // Database filename
 343                 char   outerJoins[2];                                                   // Indicates whether the data source supports outer joins
 344                 char     procedureSupport[2];                                   // Indicates whether the data source supports stored procedures
 345                 UWORD  maxConnections;                                                  // Maximum # of connections the data source supports
 346                 UWORD  maxStmts;                                                                        // Maximum # of HSTMTs per HDBC
 347                 UWORD  apiConfLvl;                                                              // ODBC API conformance level
 348                 UWORD  cliConfLvl;                                                              // Indicates whether the data source is SAG compliant
 349                 UWORD  sqlConfLvl;                                                              // SQL conformance level
 350                 UWORD  cursorCommitBehavior;                                    // Indicates how cursors are affected by a db commit
 351                 UWORD  cursorRollbackBehavior;                          // Indicates how cursors are affected by a db rollback
 352                 UWORD  supportNotNullClause;                                    // Indicates if data source supports NOT NULL clause
 353                 char   supportIEF[2];                                                   // Integrity Enhancement Facility (Referential Integrity)
 354                 UDWORD txnIsolation;                                                            // Default transaction isolation level supported by the driver
 355                 UDWORD txnIsolationOptions;                                     // Transaction isolation level options available
 356                 UDWORD fetchDirections;                                                 // Fetch directions supported
 357                 UDWORD lockTypes;                                                                       // Lock types supported in SQLSetPos
 358                 UDWORD posOperations;                                                   // Position operations supported in SQLSetPos
 359                 UDWORD posStmts;                                                                        // Position statements supported
 360                 UDWORD scrollConcurrency;                                               // Concurrency control options supported for scrollable cursors
 361                 UDWORD scrollOptions;                                                   // Scroll Options supported for scrollable cursors
 362                 UDWORD staticSensitivity;                                               // Indicates if additions, deletions and updates can be detected
 363                 UWORD  txnCapable;                                                              // Indicates if the data source supports transactions
 364                 UDWORD loginTimeout;                                                            // Number seconds to wait for a login request
 365         } dbInf;
 366
 367         // ODBC handles
 368         HENV  henv;             // ODBC Environment handle
 369         HDBC  hdbc;             // ODBC DB Connection handle
 370         HSTMT hstmt;    // ODBC Statement handle
 371
 372         // ODBC Error Inf.
 373         char   sqlState[20];
 374         SDWORD nativeError;
 375         char   errorMsg[SQL_MAX_MESSAGE_LENGTH];
 376         SWORD  cbErrorMsg;
 377         char   errorList[DB_MAX_ERROR_HISTORY][DB_MAX_ERROR_MSG_LEN];
 378         int    DB_STATUS;
 379
 380         //Error reporting mode
 381         bool silent;
 382
 383         // Number of Ctable objects connected to this db object
 384         unsigned int nTables;
 385
 386         // Inf. about logical data types VARCHAR, INTEGER, FLOAT and DATE.
 387         // This inf. is obtained from the ODBC driver by use of the
 388         // SQLGetTypeInfo() function.  The key piece of inf. is the
 389         // type name the data source uses for each logical data type.
 390         // e.g. VARCHAR; Oracle calls it VARCHAR2.
 391         SqlTypeInfo typeInfVarchar, typeInfInteger, typeInfFloat, typeInfDate;
 392
 393         // Public member functions
 394         wxDB(HENV &aHenv);
 395         bool             Open(char *Dsn, char *Uid, char *AuthStr);  // Data Source Name, User ID, Password
 396         void             Close(void);
 397         bool             CommitTrans(void);
 398         bool             RollbackTrans(void);
 399         bool             DispAllErrors(HENV aHenv, HDBC aHdbc = SQL_NULL_HDBC, HSTMT aHstmt = SQL_NULL_HSTMT);
 400         bool             GetNextError(HENV aHenv, HDBC aHdbc = SQL_NULL_HDBC, HSTMT aHstmt = SQL_NULL_HSTMT);
 401         void             DispNextError(void);
 402         bool             CreateView(char *viewName, char *colList, char *pSqlStmt, bool attemptDrop=TRUE);
 403         bool             DropView(char *viewName);
 404         bool             ExecSql(char *pSqlStmt);
 405         bool             GetNext(void);
 406         bool             GetData(UWORD colNo, SWORD cType, PTR pData, SDWORD maxLen, SDWORD FAR *cbReturned);
 407         bool        Grant(int privileges, char *tableName, char *userList = "PUBLIC");
 408         int         TranslateSqlState(char *SQLState);
 409         bool             Catalog(char *userID, char *fileName = "Catalog.txt");
 410         CcolInf *GetColumns(char *tableName[], char *userID=NULL);
 411         char            *GetDatabaseName(void)  {return dbInf.dbmsName;}
 412         char            *GetDataSource(void)            {return dsn;}
 413         char            *GetUsername(void)                      {return uid;}
 414         char            *GetPassword(void)                      {return authStr;}
 415         bool             IsOpen(void)                           {return dbIsOpen;}
 416         HENV             GetHENV(void)                          {return henv;}
 417         HDBC             GetHDBC(void)                          {return hdbc;}
 418         HSTMT            GetHSTMT(void)                         {return hstmt;}
 419         bool             TableExists(char *tableName, char *userID=NULL, char *path=NULL);  // Table name can refer to a table, view, alias or synonym
 420         void             LogError(char *errMsg, char *SQLState = 0) {logError(errMsg, SQLState);}
 421         bool             SqlLog(enum sqlLog state, char *filename = "sqllog.txt", bool append = FALSE);
 422         bool             WriteSqlLog(char *logMsg);
 423         DBMS             Dbms(void);
 424
 425 };  // wxDB
 426
 427 // This structure forms a node in a linked list.  The linked list of "DbList" objects
 428 // keeps track of allocated database connections.  This allows the application to
 429 // open more than one database connection through ODBC for multiple transaction support
 430 // or for multiple database support.
 431
 432 struct DbList
 433 {
 434         DbList *PtrPrev;                                                        // Pointer to previous item in the list
 435         char    Dsn[SQL_MAX_DSN_LENGTH+1];      // Data Source Name
 436         wxDB     *PtrDb;                                                                // Pointer to the wxDB object
 437         bool    Free;                                                           // Is item free or in use?
 438         DbList *PtrNext;                                                        // Pointer to next item in the list
 439 };
 440
 441
 442 #ifdef __WXDEBUG__
 443 #include "wx/object.h"
 444 class CstructTablesInUse : public wxObject
 445 {
 446         public:
 447                 const char      *tableName;
 448                 ULONG                    tableID;
 449                 class wxDB      *pDb;
 450 };  // CstructTablesInUse
 451 #endif
 452
 453 // The following routines allow a user to get new database connections, free them
 454 // for other code segments to use, or close all of them when the application has
 455 // completed.
 456
 457 wxDB WXDLLEXPORT *GetDbConnection(DbStuff *pDbStuff);
 458 bool  WXDLLEXPORT FreeDbConnection(wxDB *pDb);
 459 void  WXDLLEXPORT CloseDbConnections(void);
 460 int   WXDLLEXPORT NumberDbConnectionsInUse(void);
 461
 462 // This function sets the sql log state for all open wxDB objects
 463 bool SqlLog(enum sqlLog state, char *filename = "sqllog.txt");
 464
 465 // This routine allows you to query a driver manager
 466 // for a list of available datasources.  Call this routine
 467 // the first time using SQL_FETCH_FIRST.  Continue to call it
 468 // using SQL_FETCH_NEXT until you've exhausted the list.
 469 bool WXDLLEXPORT GetDataSource(HENV henv, char *Dsn, SWORD DsnMax, char *DsDesc, SWORD DsDescMax,
 470                                                  UWORD direction = SQL_FETCH_NEXT);
 471
 472 #endif