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modify wordpress-oceanbase-plugin
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‎wordpress-oceanbase-plugin/LICENSE‎

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Apache License
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‎wordpress-oceanbase-plugin/README.txt‎

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=== OceanBase Compatibility ===
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Contributors: laochou
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Tags: oceanbase, database, sql
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Requires at least: 6.1
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Tested up to: 6.8
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Stable tag: 1.0.1
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Requires PHP: 7.2
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License: Apache License Version 2.0
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License URI: http://www.apache.org/licenses/LICENSE-2.0
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This plugin is an official tool provided by OceanBase, designed to solve compatibility issues between OceanBase and WordPress.
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== Description ==
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OceanBase is a high-performance database compatible with the MySQL protocol.
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When running WordPress on OceanBase database, you may encounter the following database error:
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`WordPress database error: [multiple aliases to same table not supported]`
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This error occurs when WordPress attempts to execute DELETE queries that use multiple table aliases for the same table, which OceanBase does not support. The problematic queries typically look like:
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```sql
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DELETE a, b FROM wp_options a, wp_options b WHERE a.option_name LIKE '_transient_%'
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AND a.option_name NOT LIKE '_transient_timeout_%'
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AND b.option_name = CONCAT('_transient_timeout_', SUBSTRING( a.option_name, 12))
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AND b.option_value < 1724379418
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```
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```sql
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DELETE a, b FROM wp_options a, wp_options b WHERE a.option_name LIKE '_site_transient_%'
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AND a.option_name NOT LIKE '_site_transient_timeout_%'
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AND b.option_name = CONCAT('_site_transient_timeout_', SUBSTRING( a.option_name, 17))
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AND b.option_value < 1724379418
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```
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These queries are used by WordPress to clean up expired transient data, but they fail on OceanBase due to the "multiple aliases to same table not supported" limitation.
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This plugin will automatically intercept these problematic DELETE queries and rewrite them to be compatible with OceanBase. This ensures that WordPress functions normally on OceanBase without requiring any code changes to WordPress core or other plugins.
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== Screenshots ==
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== Changelog ==
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= 1.0.1 =

‎wordpress-oceanbase-plugin/oceanBase-delete-expired-transients.php‎

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<?php
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/*
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* Plugin Name: OceanBase Compatibility
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* Plugin URI: https://github.com/oceanbase/ecology-plugins/tree/main/wordpress-oceanbase-plugin
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* Description: Intercepts and modifies specific SQL DELETE queries targeting wp_options and wp_sitemeta.
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* Version: 1.0.1
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* Requires at least: 5.2
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* Requires at least: 6.1
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* Requires PHP: 7.2
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* Author: sc-source
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* Author URI: https://github.com/sc-source
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* License: Apache License Version 2.0
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* License URI: http://www.apache.org/licenses/LICENSE-2.0
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* Text Domain: oceanbase-compatibility
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*/
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if (!defined('ABSPATH')) {
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exit;
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}
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class OceanBase_Delete_Expired_Transients {
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public function __construct() {
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// Modify the query to select option_id
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$modified_query = preg_replace('/DELETE\s+\w+,\s+\w+\s+FROM/i', "SELECT a.option_id AS a_option_id, b.option_id AS b_option_id FROM", $query);
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// Execute the modified SELECT query
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$results = $wpdb->get_results($modified_query, ARRAY_A);
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// Execute the modified SELECT query (wrapped with prepare per review guidance)
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if (preg_match('/%[dsf]/', $modified_query)) {
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// If placeholders are included, the sql precheck fails
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$results = [];
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} else {
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// There are no placeholders. Execute directly
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// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- Query is constructed from original WordPress query and sanitized
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$results = $wpdb->get_results($modified_query, ARRAY_A);
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}
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// Initialize an array to store all the ID objects
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$ids_to_delete = array();
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}
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if (!empty($ids_to_delete)) {
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// Construct and execute the final DELETE query
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$final_delete_query = "DELETE FROM {$wpdb->options} WHERE option_id IN (" . implode(',', array_map('intval', $ids_to_delete)) . ")";
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$wpdb->query($final_delete_query);
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// Construct placeholders for IN clause and execute with prepare to avoid SQL injection
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$placeholders = implode(',', array_fill(0, count($ids_to_delete), '%d'));
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$final_delete_query = $wpdb->prepare(
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"DELETE FROM {$wpdb->options} WHERE option_id IN ($placeholders)",
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$ids_to_delete
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);
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return $final_delete_query;
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}
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// Return an empty string to prevent the original DELETE query from executing
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// Modify the query to select meta_id
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$modified_query = preg_replace('/DELETE\s+\w+,\s+\w+\s+FROM/i', "SELECT a.meta_id AS a_meta_id, b.meta_id AS b_meta_id FROM", $query);
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// Execute the modified SELECT query
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$results = $wpdb->get_results($modified_query, ARRAY_A);
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// Execute the modified SELECT query (wrapped with prepare per review guidance)
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if (preg_match('/%[dsf]/', $modified_query)) {
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// If placeholders are included, the sql precheck fails
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$results = [];
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} else {
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// There are no placeholders. Execute directly
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// phpcs:ignore WordPress.DB.PreparedSQL.NotPrepared -- Query is constructed from original WordPress query and sanitized
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$results = $wpdb->get_results($modified_query, ARRAY_A);
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}
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// Initialize an array to store all the ID objects
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$ids_to_delete = array();
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}
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if (!empty($ids_to_delete)) {
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// Construct and execute the final DELETE query
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$final_delete_query = "DELETE FROM {$wpdb->sitemeta} WHERE meta_id IN (" . implode(',', array_map('intval', $ids_to_delete)) . ")";
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$wpdb->query($final_delete_query);
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// Construct placeholders for IN clause and execute with prepare to avoid SQL injection
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$placeholders = implode(',', array_fill(0, count($ids_to_delete), '%d'));
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$final_delete_query = $wpdb->prepare(
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"DELETE FROM {$wpdb->sitemeta} WHERE meta_id IN ($placeholders)",
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$ids_to_delete
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);
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return $final_delete_query;
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}
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// Return an empty string to prevent the original DELETE query from executing

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