} else {
if (array_key_exists('btn_field_del', $_POST) && $_POST['field_name']) {
$field = $_POST['field_name'];
$oaSchema->fieldDelete($table, $field);
} else {
if (array_key_exists('btn_index_del', $_POST) && $_POST['index_name']) {
$index = $_POST['index_name'];
$oaSchema->indexDelete($table, $index);
} else {
if (array_key_exists('btn_index_add', $_POST) && $_POST['idx_fld_add'] && $_POST['index_add']) {
$index_fields = $_POST['idx_fld_add'];
$index_name = $_POST['index_add'];
$sort_desc = $_POST['idx_fld_desc'];
$unique = $_POST['idx_unique'];
$primary = $_POST['idx_primary'];
$oaSchema->indexAdd($table, $index_name, $index_fields, $primary, $unique, $sort_desc);
} else {
if (array_key_exists('btn_index_save', $_POST) && $_POST['index_name']) {
$index_name = $_POST['index_name'];
$index_no = $_POST['index_no'];
$index_def = $_POST['idx'][$index_no];
$oaSchema->indexSave($table, $index_name, $index_def);
} else {
if (array_key_exists('btn_link_del', $_POST) && $_POST['link_name']) {
$link_name = $_POST['link_name'];
$oaSchema->linkDelete($table, $link_name);
} else {
if (array_key_exists('btn_link_add', $_POST) && $_POST['link_add'] && $_POST['link_add_target']) {
$link_add = $_POST['link_add'];
$link_add_target = $_POST['link_add_target'];
$oaSchema->linkAdd($table, $link_add, $link_add_target);