尝试创建新的Wordpress数据库表 [英] Trying To Create New Wordpress Database Table

问题描述

只需尝试在插件激活时创建新的数据库表即可。
为了热爱生活，我无法弄清为什么这行不通。

Just trying to create a new database table on plugin activation. For the love of life I cannot figure out why this will not work.

function super_simple_photo_activate() {
global $wpdb;
$table_name = $wpdb->prefix."super_simple_photo_options";
if ($wpdb->get_var('SHOW TABLES LIKE '.$table_name) != $table_name) {
    $sql = 'CREATE TABLE '.$table_name.'(
        thumbs_max VARCHAR(3),
        image_max VARCHAR(4),
        image_quality VARCHAR(3),
        PRIMARY KEY  (id))';

    require_once(ABSPATH.'wp-admin/includes/upgrade.php');
    dbDelta($sql);

    add_option("super_simple_photo_db_version", "1.0");
}
}
register_activation_hook(__FILE__, 'super_simple_photo_activate');

我花了至少5个小时对此进行了修补，但是没有运气，激活也没有错误

I've spent at least 5 hours tinkering with this but with no luck, no error either on activation.

诀窍是什么-id整数不为空-谢谢t.thielemans

What did the trick - id INTEGER NOT NULL - thanks t.thielemans

$sql = 'CREATE TABLE '.$table_name.'(
        id INTEGER NOT NULL,
        thumbs_max VARCHAR(3),
        image_max VARCHAR(4),
        image_quality VARCHAR(3),
        PRIMARY KEY  (id))';

推荐答案

您的创建表语法错误，应为：

Your create table syntax is wrong, should be:

 $sql = 'CREAT TABLE '.$table_name.'(
-----
 $sql = 'CREATE TABLE '.$table_name.'(

编辑：定义主键

 $sql = 'CREATE TABLE '.$table_name.'(
        id INTEGER NOT NULL,
        thumbs_max VARCHAR(3),
        image_max VARCHAR(4),
        image_quality VARCHAR(3),
        PRIMARY KEY (id))';

来自W3schools的SQL的其他信息： http://www.w3schools.com/sql/sql_primarykey.asp

Bit of extra info on SQL from W3schools: http://www.w3schools.com/sql/sql_primarykey.asp

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