zm_db.cpp

//
// ZoneMinder MySQL Implementation, $Date$, $Revision$
// Copyright (C) 2001-2008 Philip Coombes
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program 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 General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
// 

#include <stdlib.h>
#include <string.h>

#include "zm.h"
#include "zm_db.h"

MYSQL dbconn;

int zmDbConnected = false;

void zmDbConnect()
{
	if ( !mysql_init( &dbconn ) )
	{
		Error( "Can't initialise database connection: %s", mysql_error( &dbconn ) );
		exit( mysql_errno( &dbconn ) );
	}
    my_bool reconnect = 1;
    if ( mysql_options( &dbconn, MYSQL_OPT_RECONNECT, &reconnect ) )
        Fatal( "Can't set database auto reconnect option: %s", mysql_error( &dbconn ) );
    std::string::size_type colonIndex = staticConfig.DB_HOST.find( ":/" );
    if ( colonIndex != std::string::npos )
    {
        std::string dbHost = staticConfig.DB_HOST.substr( 0, colonIndex );
        std::string dbPort = staticConfig.DB_HOST.substr( colonIndex+1 );
	    if ( !mysql_real_connect( &dbconn, dbHost.c_str(), staticConfig.DB_USER.c_str(), staticConfig.DB_PASS.c_str(), 0, atoi(dbPort.c_str()), 0, 0 ) )
	    {
		    Error( "Can't connect to server: %s", mysql_error( &dbconn ) );
		    exit( mysql_errno( &dbconn ) );
	    }
    }
    else
    {
	    if ( !mysql_real_connect( &dbconn, staticConfig.DB_HOST.c_str(), staticConfig.DB_USER.c_str(), staticConfig.DB_PASS.c_str(), 0, 0, 0, 0 ) )
	    {
		    Error( "Can't connect to server: %s", mysql_error( &dbconn ) );
		    exit( mysql_errno( &dbconn ) );
	    }
    }
	if ( mysql_select_db( &dbconn, staticConfig.DB_NAME.c_str() ) )
	{
		Error( "Can't select database: %s", mysql_error( &dbconn ) );
		exit( mysql_errno( &dbconn ) );
	}
    zmDbConnected = true;
}

void zmDbClose()
{
    if ( zmDbConnected )
    {
        mysql_close( &dbconn );
        // mysql_init() call implicitly mysql_library_init() but
        // mysql_close() does not call mysql_library_end()
        mysql_library_end();
        zmDbConnected = false;
    }
}

MYSQL_RES * zmDbFetch( const char * query ) {
	if ( ! zmDbConnected ) {
		Error( "Not connected." );
		return NULL;
	}

	if ( mysql_query( &dbconn, query ) ) {
		Error( "Can't run query: %s", mysql_error( &dbconn ) );
		return NULL;
	}
	Debug( 4, "Success running query: %s", query );
	MYSQL_RES *result = mysql_store_result( &dbconn );
	if ( !result ) {
		Error( "Can't use query result: %s for query %s", mysql_error( &dbconn ), query );
		return NULL;
	}
	return result;
} // end MYSQL_RES * zmDbFetch( const char * query );

MYSQL_ROW zmDBFetchOne( const char *query ) {
	MYSQL_RES *result = zmDbFetch( query );
	int n_rows = mysql_num_rows( result );
	if ( n_rows != 1 ) {
		Error( "Bogus number of lines return from query, %d returned for query %s.", n_rows, query );
		return NULL;
	}

	MYSQL_ROW dbrow = mysql_fetch_row( result );
	if ( ! dbrow ) {
		Error("Error getting row from query %s. Error is %s", query, mysql_error( &dbconn ) );
		return NULL;
	}
	return dbrow;
}