DbDriverMySqlHelper.cpp

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// Copyright (C) 2004 Bernhard Assmann <bernie@tuxomania.net>
//  
// 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 <sstream>
#include <numeric>

#include "psfa/DbDriverMySqlHelper.hpp"
#include "psfa/Config.hpp"



int psfa::DbDriverMySqlHelper::fileId_ = 0;

int psfa::DbDriverMySqlHelper::overhead_ = 0;

std::vector< int > psfa::DbDriverMySqlHelper::lengths_;



bool
psfa::DbDriverMySqlHelper::connect() 
{
  Config* conf = Config::getConfig();
  try {
    con_.set_Host( conf->getConfigValue( "mysql", "host" ) );
    con_.set_User( conf->getConfigValue( "mysql", "user" ) );
    con_.set_Password( conf->getConfigValue( "mysql", "password" ) );
    con_.connect();
    con_.select_database( conf->getConfigValue( "mysql", "db" ) );
  }
  catch (mysqlcppapi::ex_BadQuery& er) {
    return false;
  }
  return con_.is_connected();
}


  
bool
psfa::DbDriverMySqlHelper::disconnect() 
{
  if( con_.is_connected() ) {
    con_.close();
    return true;
  }
  return false;
}



mysqlcppapi::Result_NoData
psfa::DbDriverMySqlHelper::executeSql( const std::ostringstream& sql ) 
{
  try {
    mysqlcppapi::Query query = con_.create_Query();
    query << sql.str();
    mysqlcppapi::Result_NoData res = query.execute();
    return res;
  }
  catch(mysqlcppapi::ex_BadQuery& er) {
    mysqlcppapi::Result_NoData r;
    return r;
  }
  catch(mysqlcppapi::ex_BadConversion& er) {
    mysqlcppapi::Result_NoData r;
    return r;
  }
}



void
psfa::DbDriverMySqlHelper::queryDb( const std::ostringstream& sql,
                mysqlcppapi::Result_Store& store ) 
{
  try {
    mysqlcppapi::Query query = con_.create_Query();
    query << sql.str();
    store = query.store();
    return;
  }
  catch(mysqlcppapi::ex_BadQuery& er) {
    return;
  }
  catch(mysqlcppapi::ex_BadConversion& er) {
    return;
  }
}

  

int
psfa::DbDriverMySqlHelper::getNextId( const std::string table, 
                  const std::string idField ) 
{
  try {
    mysqlcppapi::Query query = con_.create_Query();
    query << "SELECT MAX("
     << idField
     << ") FROM "
     << table;
    mysqlcppapi::Result_Store res = query.store();
    mysqlcppapi::Row row = res.fetch_row();
    int id = row[0];
    if( id ) {
      return id + 1;
    }
    else {
      return 1;
    }
  }
  catch(mysqlcppapi::ex_BadQuery& er) {
    return 0;
  }
  catch(mysqlcppapi::ex_BadConversion& er) {
    return 0;
  }
}




const std::string
psfa::DbDriverMySqlHelper::getSingleValueString( const std::ostringstream& sql )
{
  try {
    mysqlcppapi::Query query = con_.create_Query();
    query << sql.str();
    mysqlcppapi::Result_Store res = query.store();
    if( res.size() != 0 ) {
      mysqlcppapi::Row row = res.fetch_row();
      return row[0];
    }
    else {
      return "";
    }
  }
  catch(mysqlcppapi::ex_BadQuery& er) {
    return "";
  }
  catch(mysqlcppapi::ex_BadConversion& er) {
    return "";
  }
}



int
psfa::DbDriverMySqlHelper::getSingleValueInt( const std::ostringstream& sql )
{
  try {
    mysqlcppapi::Query query = con_.create_Query();
    query << sql.str();
    mysqlcppapi::Result_Store res = query.store();
    if( res.size() != 0 ) {
      mysqlcppapi::Row row = res.fetch_row();
      return row[0];
    }
    else {
      return 0;
    }
  }
  catch(mysqlcppapi::ex_BadQuery& er) {
    return 0;
  }
  catch(mysqlcppapi::ex_BadConversion& er) {
    return 0;
  }
}

int
psfa::DbDriverMySqlHelper::calculateFilePosition( int line,
                    int column,
                    int fileId ) 
{
  std::ostringstream sql;
  
  if( line < 1 ) {
    return 0;
  }
  --line;
  if( fileId_ != fileId ) {
    sql.str("");
    sql << "SELECT f_dos FROM file WHERE file_id ='"
   << fileId
   << "'";
    overhead_ = getSingleValueInt( sql );

    sql.str("");
    sql << "SELECT r_length FROM file_row WHERE file_id ='"
   << fileId
   << "' ORDER BY __id";
    lengths_.clear();
    getValueVector( sql, lengths_ );
    fileId_ = fileId;
  }
  int pos = std::accumulate( lengths_.begin(), 
              lengths_.begin() + line,
              0 )
    + column
    + line * overhead_
    - 1;
  return pos;
}

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