postgresxx.cpp

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/*
_______________________________________________________________________________

                                 SqlWrapperXX

-------------------------------------------------------------------------------
Copyright (c) 2007 Kai Braaten

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-------------------------------------------------------------------------------
*/

#include "postgresxx.hpp"

// Public member functions

PostgresContext::PostgresContext( const string &dbName,
                                  const string &user,
                                  const string &passwd,
                                  const string &host,
                                  const int port,
                                  const string &unixSocket,
                                  const unsigned long clientFlags )
  : handle( 0 ),
    _dbName( dbName ),
    _user( user ),
    _passwd( passwd ),
    _host( host ),
    _port( port )
{
  if( !_dbName.empty() )
    {
      try
        {
          open();
        }
      catch( SqlDatabaseOpenException &e )
        {
          throw e;
        }
    }  
}

PostgresContext::~PostgresContext()
{
  close();
}

void PostgresContext::close()
{
  if( handle )
    {
      PQfinish( handle );
    }
}

string PostgresContext::escapeString( const string &param ) const
{
  char escapedSql[ param.length() * 2 + 1 ];
  PQescapeStringConn( handle, escapedSql, param.c_str(), param.length(), 0 );
  return escapedSql;
}

string PostgresContext::version() const
{
  ostringstream buf;
  buf << "PostgreSQL " << PQserverVersion( handle );
  return buf.str();
}

// Private member functions

void PostgresContext::open()
{
  if( handle == 0 )
    {
      ostringstream buf;

      buf << "host=" << _host << " dbname=" << _dbName
          << " user=" << _user << " password=" << _passwd
          << " connect_timeout=5" << " options=" << _clientFlags;

      handle = PQconnectdb( buf.str().c_str() );

      if( PQstatus( handle ) != CONNECTION_OK )
        {
          string ex = "Failed to connect to database: ";
          ex += PQerrorMessage( handle );
          close();
          throw SqlDatabaseOpenException( ex );
        }
    }
}

SqlResult PostgresContext::query( const string &sql ) const
{
  PGresult *rawResult = 0;
  SqlResult result;

  if( !( rawResult = PQexec( handle, sql.c_str() ) ) )
    {
      string ex = "Bad SQL statement: ";
      ex += sql;
      ex += "\nPostgreSQL message: ";
      ex += PQerrorMessage( handle );
      throw SqlDatabaseBadStatementException( ex );
    }

  ExecStatusType retValue = PQresultStatus( rawResult );

  if( retValue == PGRES_TUPLES_OK )
    {
      int numRows = PQntuples( rawResult );
      int numColumns = PQnfields( rawResult );

      for( int r = 0; r < numRows; ++r )
        {
          SqlRow *row = new SqlRow( numColumns );
          result.add( row );

          for( int c = 0; c < numColumns; ++c )
            {
              row->add( PQgetvalue( rawResult, r, c ) );
            }
        }
    }
  else if( retValue == PGRES_BAD_RESPONSE
           || retValue == PGRES_FATAL_ERROR
           || retValue == PGRES_EMPTY_QUERY )

    {
      string ex = sql;
      ex += "\nPostgreSQL message: ";
      ex += PQresStatus( retValue );
      ex += ": ";
      ex += PQerrorMessage( handle );
      throw SqlDatabaseUnknownException( ex );
    }

  PQclear( rawResult );
  return result;
}

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