protected function openConnection($create_tables = false)
  {
    //PHPCrawlerBenchmark::start("Connecting to SQLite-cache-db");
    
    // Open sqlite-file
    try
    {
      $this->PDO = new PDO("sqlite:".$this->sqlite_db_file);
    }
    catch (Exception $e)
    {
      throw new Exception("Error creating SQLite-cache-file, ".$e->getMessage().", try installing sqlite3-extension for PHP.");
    }
    
    $this->PDO->exec("PRAGMA journal_mode = OFF");
    
    $this->PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
    $this->PDO->setAttribute(PDO::ATTR_TIMEOUT, 100);
    
    if ($create_tables == true)
    {
      // Create url-table (if not exists)
      $this->PDO->exec("CREATE TABLE IF NOT EXISTS cookies (id integer PRIMARY KEY AUTOINCREMENT,
                                                            cookie_hash TEXT UNIQUE,
                                                            source_domain TEXT,
                                                            source_url TEXT,
                                                            name TEXT,
                                                            value TEXT,
                                                            domain TEXT,
                                                            path TEXT,
                                                            expires TEXT,
                                                            expire_timestamp INTEGER,
                                                            cookie_send_time INTEGER);");
      
      // Create indexes (seems that indexes make the whole thingy slower)
      $this->PDO->exec("CREATE INDEX IF NOT EXISTS cookie_hash ON cookies (cookie_hash);");
      
      $this->PDO->exec("ANALYZE;");
    }
    
    //PHPCrawlerBenchmark::stop("Connecting to SQLite-cache-db");
  }
protected function openConnection($create_tables = false)
  {
    //PHPCrawlerBenchmark::start("Connecting to SQLite-cache-db");
    
    // Open sqlite-file
    try
    {
      $this->PDO = new PDO("sqlite:".$this->sqlite_db_file);
    }
    catch (Exception $e)
    {
      throw new Exception("Error creating SQLite-cache-file, ".$e->getMessage().", try installing sqlite3-extension for PHP.");
    }
    
    $this->PDO->exec("PRAGMA journal_mode = OFF");
    
    $this->PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
    $this->PDO->setAttribute(PDO::ATTR_TIMEOUT, 100);
    
    if ($create_tables == true)
    {
      // Create url-table (if not exists)
      $this->PDO->exec("CREATE TABLE IF NOT EXISTS cookies (id integer PRIMARY KEY AUTOINCREMENT,
                                                            cookie_hash TEXT UNIQUE,
                                                            source_domain TEXT,
                                                            source_url TEXT,
                                                            name TEXT,
                                                            value TEXT,
                                                            domain TEXT,
                                                            path TEXT,
                                                            expires TEXT,
                                                            expire_timestamp INTEGER,
                                                            cookie_send_time INTEGER);");
      
      // Create indexes (seems that indexes make the whole thingy slower)
      $this->PDO->exec("CREATE INDEX IF NOT EXISTS cookie_hash ON cookies (cookie_hash);");
      
      $this->PDO->exec("ANALYZE;");
    }
    
    //PHPCrawlerBenchmark::stop("Connecting to SQLite-cache-db");
  }
protected function openConnection ( $ create_tables = false ) { //PHPCrawlerBenchmark::start("Connecting to SQLite-cache-db");
 // Open sqlite-file
 try { $ this -> PDO = new PDO ( "sqlite:" . $ this -> sqlite_db_file ) ; } catch ( Exception $ e ) { throw new Exception ( "Error creating SQLite-cache-file, " . $ e -> getMessage ( ) . ", try installing sqlite3-extension for PHP." ) ; } $ this -> PDO -> exec ( "PRAGMA journal_mode = OFF" ) ; $ this -> PDO -> setAttribute ( PDO :: ATTR_ERRMODE , PDO :: ERRMODE_WARNING ) ; $ this -> PDO -> setAttribute ( PDO :: ATTR_TIMEOUT , 100 ) ; if ( $ create_tables == true ) { // Create url-table (if not exists)
 $ this -> PDO -> exec ( "CREATE TABLE IF NOT EXISTS cookies (id integer PRIMARY KEY AUTOINCREMENT,
                                                            cookie_hash TEXT UNIQUE,
                                                            source_domain TEXT,
                                                            source_url TEXT,
                                                            name TEXT,
                                                            value TEXT,
                                                            domain TEXT,
                                                            path TEXT,
                                                            expires TEXT,
                                                            expire_timestamp INTEGER,
                                                            cookie_send_time INTEGER);" ) ; // Create indexes (seems that indexes make the whole thingy slower)
 $ this -> PDO -> exec ( "CREATE INDEX IF NOT EXISTS cookie_hash ON cookies (cookie_hash);" ) ; $ this -> PDO -> exec ( "ANALYZE;" ) ; } //PHPCrawlerBenchmark::stop("Connecting to SQLite-cache-db");
 }
Creates the sqlite-db-file and opens connection to it.

@param bool $create_tables Defines whether all necessary tables should be created
Creates the sqlite - db - file and opens connection to it .