def build_query(params)
      query  = []
      query << "school_enrollment.enroll_status_code==#{params[:status_code]}" if params.has_key?(:status_code)
      query << "school_enrollment.enroll_status==#{params[:enroll_status]}"    if params.has_key?(:enroll_status)
      query << "student_username==#{params[:username]}"  if params.has_key?(:username)
      query << "name.last_name==#{params[:last_name]}"   if params.has_key?(:last_name)
      query << "name.first_name==#{params[:first_name]}" if params.has_key?(:first_name)
      query << "local_id==#{params[:local_id]}"          if params.has_key?(:local_id)
      query << "local_id==#{params[:student_id]}"        if params.has_key?(:student_id)
      query << "id==#{params[:dcid]}"                    if params.has_key?(:dcid)
      query << "id==#{params[:id]}"                      if params.has_key?(:id)
      answer = query.join(";")
      answer
    end
def build_query(params)
      query  = []
      query << "school_enrollment.enroll_status_code==#{params[:status_code]}" if params.has_key?(:status_code)
      query << "school_enrollment.enroll_status==#{params[:enroll_status]}"    if params.has_key?(:enroll_status)
      query << "student_username==#{params[:username]}"  if params.has_key?(:username)
      query << "name.last_name==#{params[:last_name]}"   if params.has_key?(:last_name)
      query << "name.first_name==#{params[:first_name]}" if params.has_key?(:first_name)
      query << "local_id==#{params[:local_id]}"          if params.has_key?(:local_id)
      query << "local_id==#{params[:student_id]}"        if params.has_key?(:student_id)
      query << "id==#{params[:dcid]}"                    if params.has_key?(:dcid)
      query << "id==#{params[:id]}"                      if params.has_key?(:id)
      answer = query.join(";")
      answer
    end
build the api query - you can use splats to match any character
 @param params [Hash] - valid keys include: :status_code (or :enroll_status), :username, :last_name, :first_name, :student_id (or :local_id), :id (or :dcid)
 @return [String] - "id==345;name.last_name==BA*"