D7 CCK Field Rename

cck_field_rename.php

<?php
define('DRUPAL_ROOT', getcwd());
 
require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
 
$fields = array(
    'field_tags' => 'field_carousel_tag',
);
// Loop through each of the fields/tables with the old name and change them
 
foreach ($fields as $field_name => $new_field_name) {
    // First check that field_name exists
    if (!db_table_exists('field_data_' . $field_name)) {
        // If we cannot find a data table then just continue.
 
        continue;
    }
    // Define some things...
    $data_table_name = 'field_data_' . $field_name;
    $revision_table_name = 'field_revision_' . $field_name;
    $field_info = field_info_field($field_name);
    $storage_details = $field_info['storage']['details'];
    // The storage for each field has unique configuration. Must follow.
 
 
    foreach ($storage_details['sql']['FIELD_LOAD_CURRENT'] as $field) {
        // Change the field names.
 
 
        foreach ($field as $key => $value) {
            // Rename the field table columns and preserve existing spec. Let
            // features take care of any configuration changes.
            $spec = $field_info['columns'][$key];
            db_change_field($data_table_name, $value, $new_field_name . "_" . $key, $spec);
            db_change_field($revision_table_name, $value, $new_field_name . "_" . $key, $spec);
        }
    }
    // Change the field storage table names.
    db_rename_table($data_table_name, 'field_data_' . $new_field_name);
    db_rename_table($revision_table_name, 'field_revision_' . $new_field_name);
    // Change the field names int he field_config and
    // field_instance_config tables
 
    db_update('field_config')->fields(array(
        'field_name' => $new_field_name,
    ))->condition('field_name', $field_name, '=')->execute();
 
    db_update('field_config_instance')->fields(array(
        'field_name' => $new_field_name,
    ))->condition('field_name', $field_name, '=')->execute();
}