<?php if ( ! defined( 'ABSPATH' ) ) exit;
require_once( ABSPATH . 'wp-admin/includes/upgrade.php');
abstract class NF_Abstracts_Migration
{
public $table_name = '';
public $charset_collate = '';
public $flag = '';
/**
* Constructor method for the NF_Abstracts_Migration class.
*
* @param $table_name (String) The database table name managed by the extension.
* @param $flag (String) The wp option set to determine if this migration has already been run.
*
* @since 3.0.0
*/
public function __construct( $table_name, $flag )
{
$this->table_name = $table_name;
}
/**
* Function to retrieve the full table name of the extension.
*
* @return (String) The full table name, including database prefix.
*
* @since 3.0.28
*/
public function table_name()
{
global $wpdb;
return $wpdb->prefix . $this->table_name;
}
/**
* Function to check for the existence of a column in the extension's table.
*
* @param $column (String) The name of the column to search for.
*
* @return (Boolean) Whether or not the column exists.
*
* @since 3.4.0
*/
public function column_exists( $column )
{
global $wpdb;
$response = false;
// Fetch any records of the target column.
$sql = $wpdb->prepare( "SHOW COLUMNS FROM `{$this->table_name()}` WHERE `Field` = '%s';", $column );
$result = $wpdb->query( $sql );
// If we got anything back, say so.
if ( ! empty( $result ) ) $response = true;
return $response;
}
/**
* Funciton to get the charset and collate for migrations.
*
* @param $use_default (Boolean) Whether or not to include the DEFAULT keyword in the return pattern.
*
* @return (String) A SQL formatted charset and collate for use by table definition.
*
* @since 3.0.28
* @updated 3.1.14
*/
public function charset_collate( $use_default = false )
{
$response = '';
global $wpdb;
// If our mysql version is 5.5.3 or higher...
if ( version_compare( $wpdb->db_version(), '5.5.3', '>=' ) ) {
// We can use mb4.
$response = 'CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci';
} // Otherwise...
else {
// We use standard utf8.
$response = 'CHARACTER SET utf8 COLLATE utf8_general_ci';
}
// If we need to use default...
if ( $use_default ) {
// Append that to the response.
$response = 'DEFAULT ' . $response;
}
return $response;
}
/**
* Function to run our required update functions.
*
* @param $callback (String) The function to be run by this call.
*
* @since 3.4.0
*/
public function _do_upgrade( $callback )
{
// If the method exists...
if ( method_exists( $this, $callback ) ) {
$blacklist = array(
'__construct',
'_do_upgrade',
'_run',
'run',
'_drop',
'drop'
);
// If this callback method isn't blacklisted...
if ( ! in_array( $callback, $blacklist ) ) {
// Run it.
$this->{$callback}();
}
}
}
/**
* Function to run our initial migration.
*
* @since 3.0.0
*/
public function _run()
{
// Check the flag
if( get_option( $this->flag, FALSE ) ) return;
// Run the migration
$this->run();
// Set the Flag
update_option( $this->flag, TRUE );
}
/**
* Abstract protection of inherited funciton run.
*
* @since 3.0.0
*/
protected abstract function run();
/**
* Function to drop the table managed by this migration.
*
* @since 3.0.28
*/
public function _drop()
{
global $wpdb;
// If we don't have a table name, exit early.
if( ! $this->table_name ) return;
// If the table doesn't exist, exit early.
if( 0 == $wpdb->query( $wpdb->prepare( "SHOW TABLES LIKE '%s'", $this->table_name() ) ) ) return;
// Drop the table.
$wpdb->query( "DROP TABLE " . $this->table_name() );
return $this->drop();
}
/**
* Protection of inherited function drop.
*
* @since 3.0.28
*/
protected function drop()
{
// This section intentionally left blank.
}
}
ما بقاش الذكاء الاصطناعي مجرد خيال علمي أو تطور مستنيينه في المستقبل… لأ، ده بقى واقع عايشينه كل يوم، وبيأثر بشكل مباشر على شغلنا، ومهاراتنا، وحتى على الوظايف نفسها. في الفيديو ده، هنتكلم عن إزاي الذكاء الاصطناعي قلب موازين سوق العمل، إيه المهن اللي بدأت تختفي، وإيه اللي طلع جديد، وإزاي نجهز نفسنا للمستقبل اللي بدأ خلاص.