激活插件时，使用PHP在WordPress数据库中创建两个表

Question

I am having a problem with my plugin that is suppose to create a table in the WordPress database when it is activated. My current code is as follows:

register_activation_hook(__FILE__, 'wp_table_install');

function wp_table_install(){
global $wpdb;
global $db_version;

$sql ="CREATE TABLE IF NOT EXISTS 'st_support_tickets'
('id' mediumint(8) unsigned NOT NULL auto_increment,
'ticket_id' varchar(36) NOT NULL,
'ticket_user_id' varchar(36) NOT NULL,
'ticket_description' TEXT default NULL,
'ticket_priority' varchar(255) default NULL,
'ticket_status' varchar(255) default NULL,
'ticket_type' varchar(255) default 'Private',
PRIMARY KEY ('id')) 
AUTO_INCREMENT=1;

CREATE TABLE IF NOT EXISTS 'st_support_priorities' 
('id' mediumint(8) unsigned NOT NULL auto_increment,
'ticket_user_id' varchar(36) NOT NULL,
PRIMARY KEY ('id'))
AUTO_INCREMENT=1;
";

require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
dbDelta($sql);
add_option("db_version", $db_version);
}

What is stopping these tables from being created? Is it the sql query or the syntax or what?

Answer 1

To solve this problem I remove all ' characters from the sql statements excluding around default values. Eg:

$sql1 ="CREATE TABLE IF NOT EXISTS  st_support_tickets 
(id  mediumint(8) unsigned NOT NULL auto_increment,
 ticket_user_id  varchar(36) NOT NULL,
 ticket_description TEXT,
 ticket_priority  varchar(255) default NULL,
 ticket_status  varchar(255) default NULL,
 ticket_type  varchar(255) default  'Private',
PRIMARY KEY ( id ))
AUTO_INCREMENT=1;
";

$sql2 = "CREATE TABLE IF NOT EXISTS st_support_priorities 
( id  mediumint(8) unsigned NOT NULL auto_increment,
 ticket_priority  varchar(36) NOT NULL,
PRIMARY KEY ( id ))
AUTO_INCREMENT=1;
";

Had no problems after this.