我已经创建了一个插件，可以在WordPress数据库中的现有wp_posts表上运行。为此，我创建了插件的代码，当激活插件时，它会向现有数据库添加3个字段，并在停用插件时从现有数据库中删除这3个字段。

这是我布局的屏幕截图。
我希望在在字段中添加值后，当我点击更新时，地址、纬度和经度字段将把数据显示到数据库中。

以下是代码：

<?php
/**
 * Plugin Name: Hello World
 * Plugin URI: https://example.com/my-plugin
 * Description: This is a description of my hello world sample plugin.
 * Version: 2.3.1
 * Author: Selin
 * Author URI: https://example.com
 * License: GPL v2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 */
include_once WP_PLUGIN_DIR . '/form-data/connection.php';
include_once(__DIR__. 'AdminStorecreatefile.php');
include_once(__DIR__ . 'AdminStoreview.php');
//global $post;

function db_activate() {
  global $wpdb;
  $table = $wpdb->prefix . 'posts'; 
  $charset_collate = $wpdb->get_charset_collate();
  $sql = "ALTER TABLE $table
      ADD `address` VARCHAR(255) NOT NULL,
      ADD `longitude` VARCHAR(20) NOT NULL,
      ADD `latitude` VARCHAR(20) NOT NULL
  ;";
  $wpdb->query($sql);
  $wpdb->get_results("DESCRIBE $table");
}
register_activation_hook(__FILE__, 'db_activate');

function db_deactivate() {
    global $wpdb;
    $table = $wpdb->prefix . 'posts';
    $sql = "ALTER TABLE $table DROP COLUMN `address`, DROP COLUMN `longitude`, DROP COLUMN `latitude`";
    $wpdb->query($sql);
}
register_deactivation_hook(__FILE__, 'db_deactivate');


// custom-post-type
function custom_store_metaboxes() {
  add_meta_box(
      'store_location',
      'Store Location',
      'display_store',
      'store',
      'normal',
      'high'
  );
}

function display_store($post) {
  // Get existing address, latitude, and longitude values (if any)
  $address = get_post_meta($post->ID, 'address', true);
  $latitude = get_post_meta($post->ID, 'latitude', true);
  $longitude = get_post_meta($post->ID, 'longitude', true);
  ?>
  <label for="address">Address:</label><br>
  <input type="text" id="address" name="address" value="<?php echo esc_attr($address); ?>"/><br><br>

  <label for="latitude">Latitude:</label><br>
  <input type="text" name="latitude" id="latitude" value="<?php echo esc_attr($latitude); ?>" /><br><br>

  <label for="longitude">Longitude:</label><br>
  <input type="text" name="longitude" id="longitude" value="<?php echo esc_attr($longitude); ?>" /><br><br>
  <?php
}

function save_store_location_fields($post_id) {
  if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
      return;
  }

  if (!current_user_can('edit_post', $post_id)) {
      return;
  }
    // Insert or update the address
  if (isset($_POST['address'])) {
    update_post_meta($post_id, 'address', sanitize_text_field($_POST['address']));
  }

  // Insert or update the latitude
  if (isset($_POST['latitude'])) {
      update_post_meta($post_id, 'latitude', sanitize_text_field($_POST['latitude']));
  }

  // Insert or update the longitude
  if (isset($_POST['longitude'])) {
      update_post_meta($post_id, 'longitude', sanitize_text_field($_POST['longitude']));
  }  
}
add_action('save_post_store', 'save_store_location_fields');

//wp_insert_post($address,$latitude,$longitude);
add_action('add_meta_boxes_store', 'custom_store_metaboxes');
//add_action('save_post_store', 'save_store_location_fields');

function register_custom_store_post_type() {
    $labels = array(
        'name'                  => _x( 'Store Locator', 'Post type general name', 'textdomain' ),
        'singular_name'         => _x( 'Store', 'Post type singular name', 'textdomain' ),
        'menu_name'             => _x( 'Stores', 'Admin Menu text', 'textdomain' ),
        'name_admin_bar'        => _x( 'Store', 'Add New on Toolbar', 'textdomain' ),
        'add_new'               => __( 'Add New', 'textdomain' ),
        'add_new_item'          => __( 'Add New Store', 'textdomain' ),
        'new_item'              => __( 'New Store', 'textdomain' ),
        'edit_item'             => __( 'Edit Store', 'textdomain' ),
        'view_item'             => __( 'View Store', 'textdomain' ),
        'all_items'             => __( 'All Stores', 'textdomain' ),
        'search_items'          => __( 'Search Stores', 'textdomain' ),
        'parent_item_colon'     => __( 'Parent Stores:', 'textdomain' ),
        'not_found'             => __( 'No stores found.', 'textdomain' ),
        'not_found_in_trash'    => __( 'No stores found in Trash.', 'textdomain' ),
        'featured_image'        => _x( 'Store Cover Image', 'Overrides the “Featured Image” phrase for this post type. Added in 4.3', 'textdomain' ),
        'set_featured_image'    => _x( 'Set cover image', 'Overrides the “Set featured image” phrase for this post type. Added in 4.3', 'textdomain' ),
        'remove_featured_image' => _x( 'Remove cover image', 'Overrides the “Remove featured image” phrase for this post type. Added in 4.3', 'textdomain' ),
        'use_featured_image'    => _x( 'Use as cover image', 'Overrides the “Use as featured image” phrase for this post type. Added in 4.3', 'textdomain' ),
        'archives'              => _x( 'Store archives', 'The post type archive label used in nav menus. Default “Post Archives”. Added in 4.4', 'textdomain' ),
        'insert_into_item'      => _x( 'Insert into store', 'Overrides the “Insert into post”/”Insert into page” phrase (used when inserting media into a post). Added in 4.4', 'textdomain' ),
        'uploaded_to_this_item' => _x( 'Uploaded to this store', 'Overrides the “Uploaded to this post”/”Uploaded to this page” phrase (used when viewing media attached to a post). Added in 4.4', 'textdomain' ),
        'filter_items_list'     => _x( 'Filter stores list', 'Screen reader text for the filter links heading on the post type listing screen. Default “Filter posts list”/”Filter pages list”. Added in 4.4', 'textdomain' ),
        'items_list_navigation' => _x( 'Stores list navigation', 'Screen reader text for the pagination heading on the post type listing screen. Default “Posts list navigation”/”Pages list navigation”. Added in 4.4', 'textdomain' ),
        'items_list'            => _x( 'Stores list', 'Screen reader text for the items list heading on the post type listing screen. Default “Posts list”/”Pages list”. Added in 4.4', 'textdomain' ),
    );

    $args = array(
        'labels'             => $labels,
        'description'        => 'Store custom post type.',
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array( 'slug' => 'store' ),
        'capability_type'    => 'post',
        'has_archive'        => true,
        'hierarchical'       => false,
        'menu_position'      => 10,
        'supports'           => array( 'title', 'editor', 'thumbnail', 'custom-fields' ),
        'menu_icon'          => 'dashicons-location', 
        'show_in_rest'       => true,
        'register_meta_box_cb' => 'custom_store_metaboxes'
    );  
    register_post_type('store', $args);
}
add_action('init', 'register_custom_store_post_type');
?>

我想要在地址、纬度和经度字段中插入记录，请帮我编写这部分代码。