MacLochlainns Weblog

/*
||  Function Name: update_membership
|| ----------------------------------------------------------------------
||  No return, treated as a procedure, or method returning a void.
|| ----------------------------------------------------------------------
*/
function update_membership(
    $h_account_number
  , $h_member_type
  , $h_credit_card_number
  , $h_credit_card_type
  , $account_number
  , $member_type
  , $credit_card_number
  , $credit_card_type
  , $h_first_name
  , $h_middle_name
  , $h_last_name
  , $h_contact_type
  , $first_name
  , $middle_name
  , $last_name
  , $contact_type) {
 
  // Include the credentials file if omitted.
  include_once("MySQLCredentials.inc");
 
  // Assign credentials to connection.
  $mysqli = new mysqli(HOSTNAME, USERNAME, PASSWORD, DATABASE);
 
  // Check for connection error and print message.
  if ($mysqli->connect_errno) {
    print $mysqli->connect_error."<br />";
    print "Connection not established ...<br />";
  }
  else {
    // Initial statement.
    $stmt = $mysqli->stmt_init();
 
    // Disable auto commit when you want two plus statements run.
    $mysqli->autocommit(FALSE);
 
    // Set the transaction guarantee.
    $mysqli->begin_transaction(MYSQLI_TRANS_START_READ_WRITE);
 
    // Declare a static query.
    $sql = "UPDATE   member\n"
         . "SET      member_type = ?\n"
         . ",        credit_card_number = ?\n"
         . ",        credit_card_type = ?\n"
         . "WHERE    account_number = ?\n"
         . "AND      member_type = ?\n"
         . "AND      credit_card_number = ?\n"
         . "AND      credit_card_type = ?\n";
 
    // Prepare statement.
    if ($stmt->prepare($sql)) {
      $stmt->bind_param(
          "sssssss"
         , $member_type
         , $credit_card_number
         , $credit_card_type
         , $account_number
         , $h_member_type
         , $h_credit_card_number
         , $h_credit_card_type); } 
 
    // Attempt query and exit with failure before processing.
    if (!$stmt->execute()) {
 
      // Rollback or undo the transaction.
      $mysqli->rollback();
 
      // Print failure to resolve query message.
      print $mysqli->error."<br />\n";
      print "Failed to resolve query ...<br />\n";
    }
 
    // Declare a static query.
    $sql = "UPDATE   contact\n"
         . "SET      first_name = ?\n"
         . ",        middle_name = ?\n"
         . ",        last_name = ?\n"
         . ",        contact_type = ?\n"
         . "WHERE    first_name = ?\n"
         . "AND      middle_name = ?\n"
         . "AND      last_name = ?\n"
         . "AND      contact_type = ?\n";
 
    // Prepare statement.
    if ($stmt->prepare($sql)) {
      $stmt->bind_param(
          "ssssssss"
        , $first_name
        , $middle_name
        , $last_name
        , $contact_type
        , $h_first_name
        , $h_middle_name
        , $h_last_name
        , $h_contact_type); } 
 
    // Attempt query and exit with failure before processing.
    if (!$stmt->execute()) {
 
      // Rollback or undo the transaction.
      $mysqli->rollback();
 
      // Print failure to resolve query message.
      print $mysqli->error."<br />";
      print "Failed to resolve query ...<br />";
    }
    else {   
      /*  Manually commiting writes when you have disabled the
      ||  default auto commit setting, explained above.
      || ------------------------------------------------------------
      ||  You would add the following command to commit the 
      ||  transaction.
      ||  ------------------------------
      ||   $mysqli->commit();
      || ------------------------------------------------------------
      */
      $mysqli->commit();
 
      // Close the transaction.
      $mysqli->close();
    }
  }
}