code: public void eachRow(GString gstring, Closure closure) throws SQLException {
          eachRow(gstring, null, closure);
      }
docs: Performs the given SQL query calling the given Closure with each row of the result set.
  The row will be a <code>GroovyResultSet</code> which is a <code>ResultSet</code>
  that supports accessing the fields using property style notation and ordinal index values.
  The query may contain GString expressions.
  <p>
  Example usage:
  <pre>
  def location = 25
  sql.eachRow("select * from PERSON where location_id < $location") { row ->
  println row.firstname
  }
  </pre>
  <p>
  Resource handling is performed automatically where appropriate.
  
  @param gstring a GString containing the SQL query with embedded params
  @param closure called for each row with a GroovyResultSet
  @throws SQLException if a database access error occurs
  @see #expand(Object)