Cannot create table in wordpress - php

Question

I cannot create table in wordpress, i'm not understand why?
private function create($prefix)
{
$sql = "CREATE TABLE " . $prefix . "submit (
submit_id bigint PRIMARY KEY AUTO_INCREMENT,
post_id bigint,
user_id bigint,
author text,
user_email text,
source text,
pass text,
language text,
time datetime,
CONSTRAINT post_id FOREIGN KEY (post_id) REFERENCES wp_posts(ID),
CONSTRAINT user_id FOREIGN KEY (user_id) REFERENCES wp_users(ID)
)";
require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
var_dump(dbDelta($sql));
}
The var_dump() shows:
array(1) { ["wp_submit"]=> string(23) "Created table wp_submit" }

Answer 1

add_action("after_switch_theme", "my_custom_table_setup");
function my_custom_table_setup()
{
global $wpdb;
$create_table_query = "
CREATE TABLE {$wpdb->prefix}products_by_sku (
id int(11) NOT NULL auto_increment,
product_id int(11) NOT NULL,
lot_id varchar(25) NOT NULL,
title varchar(255) NOT NULL,
LP varchar(25) NOT NULL,
catgeory varchar(255) NOT NULL,
product_name varchar(255) NOT NULL,
UPC varchar(255) DEFAULT NULL,
ASIN varchar(255) DEFAULT NULL,
original_retail_price float DEFAULT NULL,
quantity int(11) DEFAULT NULL,
total_original_retail float NOT NULL DEFAULT 0,
stock_image text,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
";
require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta( $create_table_query );
}
Try this code.
Thank you.

Answer 2

You can use this code:
global $jal_db_version;
$jal_db_version = '1.0';
function jal_install() {
global $wpdb;
global $jal_db_version;
$table_name = $wpdb->prefix . 'liveshoutbox';
$charset_collate = $wpdb->get_charset_collate();
$sql = "CREATE TABLE $table_name (
id mediumint(9) NOT NULL AUTO_INCREMENT,
time datetime DEFAULT '0000-00-00 00:00:00' NOT NULL,
name tinytext NOT NULL,
text text NOT NULL,
url varchar(55) DEFAULT '' NOT NULL,
PRIMARY KEY (id)
) $charset_collate;";
require_once ABSPATH . 'wp-admin/includes/upgrade.php';
dbDelta( $sql );
add_option( 'jal_db_version', $jal_db_version );
}
register_activation_hook( __FILE__, 'jal_install' );