Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  OpenGIS Simple Features Reference Implementation
       4             :  * Purpose:  Implements OGRMySQLDriver class.
       5             :  * Author:   Frank Warmerdam, warmerdam@pobox.com
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2004, Frank Warmerdam <warmerdam@pobox.com>
       9             :  *
      10             :  * Permission is hereby granted, free of charge, to any person obtaining a
      11             :  * copy of this software and associated documentation files (the "Software"),
      12             :  * to deal in the Software without restriction, including without limitation
      13             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      14             :  * and/or sell copies of the Software, and to permit persons to whom the
      15             :  * Software is furnished to do so, subject to the following conditions:
      16             :  *
      17             :  * The above copyright notice and this permission notice shall be included
      18             :  * in all copies or substantial portions of the Software.
      19             :  *
      20             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      21             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      22             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      23             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      24             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      25             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      26             :  * DEALINGS IN THE SOFTWARE.
      27             :  ****************************************************************************/
      28             : 
      29             : #include "ogr_mysql.h"
      30             : #include "cpl_conv.h"
      31             : #include "cpl_multiproc.h"
      32             : 
      33             : #include "ogrmysqldrivercore.h"
      34             : 
      35             : static CPLMutex *hMutex = nullptr;
      36             : static int bInitialized = FALSE;
      37             : 
      38             : /************************************************************************/
      39             : /*                        OGRMySQLDriverUnload()                        */
      40             : /************************************************************************/
      41             : 
      42           6 : static void OGRMySQLDriverUnload(CPL_UNUSED GDALDriver *poDriver)
      43             : {
      44           6 :     if (bInitialized)
      45             :     {
      46           2 :         mysql_library_end();
      47           2 :         bInitialized = FALSE;
      48             :     }
      49           6 :     if (hMutex != nullptr)
      50             :     {
      51           2 :         CPLDestroyMutex(hMutex);
      52           2 :         hMutex = nullptr;
      53             :     }
      54           6 : }
      55             : 
      56             : /************************************************************************/
      57             : /*                                Open()                                */
      58             : /************************************************************************/
      59             : 
      60          63 : static GDALDataset *OGRMySQLDriverOpen(GDALOpenInfo *poOpenInfo)
      61             : 
      62             : {
      63             :     OGRMySQLDataSource *poDS;
      64             : 
      65          63 :     if (!OGRMySQLDriverIdentify(poOpenInfo))
      66           0 :         return nullptr;
      67             : 
      68             :     {
      69          63 :         CPLMutexHolderD(&hMutex);
      70          63 :         if (!bInitialized)
      71             :         {
      72           5 :             if (mysql_library_init(0, nullptr, nullptr))
      73             :             {
      74           0 :                 CPLError(CE_Failure, CPLE_AppDefined,
      75             :                          "Could not initialize MySQL library");
      76           0 :                 return nullptr;
      77             :             }
      78           5 :             bInitialized = TRUE;
      79             :         }
      80             :     }
      81             : 
      82          63 :     poDS = new OGRMySQLDataSource();
      83             : 
      84          63 :     if (!poDS->Open(poOpenInfo->pszFilename, poOpenInfo->papszOpenOptions,
      85          63 :                     poOpenInfo->eAccess == GA_Update))
      86             :     {
      87           1 :         delete poDS;
      88           1 :         return nullptr;
      89             :     }
      90             :     else
      91          62 :         return poDS;
      92             : }
      93             : 
      94             : /************************************************************************/
      95             : /*                               Create()                               */
      96             : /************************************************************************/
      97             : 
      98           0 : static GDALDataset *OGRMySQLDriverCreate(const char *pszName,
      99             :                                          CPL_UNUSED int nBands,
     100             :                                          CPL_UNUSED int nXSize,
     101             :                                          CPL_UNUSED int nYSize,
     102             :                                          CPL_UNUSED GDALDataType eDT,
     103             :                                          CPL_UNUSED char **papszOptions)
     104             : {
     105             :     OGRMySQLDataSource *poDS;
     106             : 
     107           0 :     poDS = new OGRMySQLDataSource();
     108             : 
     109           0 :     if (!poDS->Open(pszName, nullptr, TRUE))
     110             :     {
     111           0 :         delete poDS;
     112           0 :         CPLError(CE_Failure, CPLE_AppDefined,
     113             :                  "MySQL driver doesn't currently support database creation.\n"
     114             :                  "Please create database before using.");
     115           0 :         return nullptr;
     116             :     }
     117             : 
     118           0 :     return poDS;
     119             : }
     120             : 
     121             : /************************************************************************/
     122             : /*                          RegisterOGRMySQL()                          */
     123             : /************************************************************************/
     124             : 
     125          11 : void RegisterOGRMySQL()
     126             : 
     127             : {
     128          11 :     if (!GDAL_CHECK_VERSION("MySQL driver"))
     129           0 :         return;
     130             : 
     131          11 :     if (GDALGetDriverByName(DRIVER_NAME) != nullptr)
     132           0 :         return;
     133             : 
     134          11 :     GDALDriver *poDriver = new GDALDriver();
     135          11 :     OGRMySQLDriverSetCommonMetadata(poDriver);
     136             : 
     137          11 :     poDriver->pfnOpen = OGRMySQLDriverOpen;
     138          11 :     poDriver->pfnCreate = OGRMySQLDriverCreate;
     139          11 :     poDriver->pfnUnloadDriver = OGRMySQLDriverUnload;
     140             : 
     141          11 :     GetGDALDriverManager()->RegisterDriver(poDriver);
     142             : }