dbconnect.cpp

C++连接一写常用数据库的接口

/*
 * DBConnection Object defining the wrapper class for all the database drivers.
 * Copyright (C) 2003 Johnathan Ingram, [e-mail]
 *
 * This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  US
 *
 */

#include "dbconnect.h"
#include "configFile.h"

#ifdef WIN32
   #define DIRCHAR '\\'
   #define LOCALCONFIG "dbconnect.ini"
   #define SYSTEMCONFIG "\\win32\\system\\dbconnect.ini"
#else
   #define DIRCHAR '/'
   #define LOCALCONFIG "./dbconnect.cfg"
   #define SYSTEMCONFIG "/etc/dbconn/dbconnect.cfg"
#endif


static char _copyright[] = {
"/*"
" * DBConnect API"
" * Copyright (C) 2003 Johnathan Ingram, [e-mail]"
" *"
" * This library is free software; you can redistribute it and/or"
" *   modify it under the terms of the GNU Lesser General Public"
" *   License as published by the Free Software Foundation; either"
" *   version 2.1 of the License, or (at your option) any later version."
" *"
" *   This library is distributed in the hope that it will be useful,"
" *   but WITHOUT ANY WARRANTY; without even the implied warranty of"
" *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU"
" *   Lesser General Public License for more details."
" *"
" *   You should have received a copy of the GNU Lesser General Public"
" *   License along with this library; if not, write to the Free Software"
" *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  US"
" *"
" */" };


// Driver file name defaults
#ifdef WIN32
// Windows
const char* DbConnection::driverPaths[] = {  
      "",
      "dbconndrv-mysql.dll",
      "dbconndrv-msql.dll",
      "dbconndrv-postgresql.dll",
      "dbconndrv-ibmDB2.dll",
      "dbconndrv-oracle8.dll",
      "dbconndrv-odbc.dll"
   };
#else
// Unices
const char* DbConnection::driverPaths[] = {  
      "",
      "dbconndrv-mysql.so",
      "dbconndrv-msql.so",
      "dbconndrv-postgresql.so",
      "dbconndrv-ibmDB2.so",
      "dbconndrv-oracle8.so",
      "dbconndrv-odbc.so"
   };
#endif

const char* DbConnection::driverNames[] = {  
      "NONE",
      "MYSQL",
      "MSQL",
      "POSTGRESQL",
      "DB2",
      "ORACLE8",
      "ODBC"
   };


//------------------------------------------------------------------------------
// PRIVATE
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// DbConnection::_buildCompatibilityTable
//------------------------------------------------------------------------------
void 
DbConnection::_buildCompatibilityTable()
{
   // Hard coded lookup table.
   vector<string> versions;
     
   // Populate version 0.3.5
   versions.push_back("0.3.4");
   versions.push_back("0.3.5");
   compatibilityTable["0.3.5"] = versions;
}  // DbConnection::_buildCompatibilityTable

   
   
//------------------------------------------------------------------------------
// PUBLIC
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
// DbConnection::DbConnection
//------------------------------------------------------------------------------
DbConnection::DbConnection(
         Driver driver, 
         const string &configFile)
:
   ptr_getAuthor(NULL),
   ptr_getVendor(NULL),
   ptr_getCopyright(NULL),
   ptr_getDriverType(NULL),
   ptr_getDriverName(NULL),
   ptr_getDriverDesc(NULL),
   ptr_getDbConnectVersion(NULL),
   ptr_createDriverInstance(NULL),
   ptr_destroyDriverInstance(NULL),
   drvRef(NULL)
{
   // Build the compatibility table.
   _buildCompatibilityTable();


   /* Steps to finding the config file in order to determine the path and config
    *  parameters for the drivers.
    * 1. Use the file iif given in configFile param.
    * 2. Look in the current directory for the config file. (./dbconnect.cfg on unix).
    * 3. Look in the systems config dir for the file.       (eg /etc/dbconnect.cfg on unix).
    * 4. If still no library path, then use defaults.
    */
   long i;
   string driverPath = "";
   vector<string> args;    


   // 1. Use the file iif given in configFile param.
   if (configFile.length() > 0)
   {
      // Try and read the information from the config file.
      ConfigFile configFile(configFile.c_str());
      configFile.read();

      if (configFile.hasKeyName("dbconnect", "driverPath"))
      {
         driverPath = configFile["dbconnect"]["driverPath"];
         // Make sure we have a proper path
         if (driverPath[driverPath.length()-1] != DIRCHAR)
            driverPath += DIRCHAR;
      }

      // Check if we have a driver file name or need to use the default.
      if (configFile.hasKeyName(driverNames[driver], "driverFile"))
         driverPath += configFile[driverNames[driver]]["driverFile"];
      else
         driverPath += driverPaths[driver];

      // Check if we have a driver section and try and obtain needed values.
      if (configFile.hasSection(driverNames[driver]))
      {           
         //Get all the driver arguments and values
         vector<string> keyNames = configFile.getSectionKeyNames(driverNames[driver]);
         for (i=0; i<keyNames.size(); i++)
         {
            args.push_back(keyNames[i].c_str());                                   // Name
            args.push_back(configFile[driverNames[driver]][keyNames[i].c_str()]);  // Value
         }
      }
   }
   else  // Try and find a config file.
   {
      try
      {
         // 2. Look in the current directory for the config file. (./dbconnect.cfg on unix).
         ConfigFile configLocalFile(LOCALCONFIG);
         configLocalFile.read();
         if (configLocalFile.hasKeyName("dbconnect", "driverPath"))
         {
            driverPath = configLocalFile["dbconnect"]["driverPath"];
            // Make sure we have a proper path
            if (driverPath[driverPath.length()-1] != DIRCHAR)
               driverPath += DIRCHAR;
         }
         // Check if we have a driver file name or need to use the default.
         if (configLocalFile.hasKeyName(driverNames[driver], "driverFile"))
            driverPath += configLocalFile[driverNames[driver]]["driverFile"];
         else
            driverPath += driverPaths[driver];

         // Check if we have a driver section and try and obtain needed values.
         if (configLocalFile.hasSection(driverNames[driver]))
         {           
            //Get all the driver arguments and values
            vector<string> keyNames = configLocalFile.getSectionKeyNames(driverNames[driver]);
            for (i=0; i<keyNames.size(); i++)
            {
               args.push_back(keyNames[i].c_str());                                        // Name
               args.push_back(configLocalFile[driverNames[driver]][keyNames[i].c_str()]);  // Value
            }
         }
      }
      catch(...)
      {
         try
         {
            // 3. Look in the systems config dir for the file. (eg /etc/dbconnect.cfg on unix).