In MySQL, you cannot do this: create table t (i int primary key, j int); insert into t values (1, 1); update t set j = (select max(j) from t) + 1; The UPDATE statement will raise an error as follows: SQL Error [1093] [HY000]: You can't specify target table 't' for update in FROM … Continue reading Workaround for MySQL’s “can’t specify target table for update in FROM clause” Error →

Web developer Joni Halabi shares a fantastic developer interview with the OpenLampTech newsletter readers and community.

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Welcome to this OpenLampTech text-based developer interview.

Web and WordPress developer Joni Halabi has been working with the web’s most used and popular CMS for several years.

Joni is also very knowledgeable about Gutenberg, focusing much of her development on writing custom blocks for the post editor.

Needless to say, I am very excited Joni participated in this …

We recently saw that we can benefit from using JSON documents with MySQL HeatWave cluster in OCI (HeatWave accelerator for MySQL Database Service).

However sometimes the data can’t be loaded to HeatWave Cluster or the query cannot use it.

And this is not always easy to understand why. Let’s get familiar on how to find the info.

Data not loaded in HW Cluster

Let’s see an example with this table (collection):

SQL > show create table listingsAndReviews\G
*************************** 1. row ***************************
       Table: listingsAndReviews
Create Table: CREATE TABLE `listingsAndReviews` (
  `doc` json DEFAULT NULL,
  `_id` char(28) GENERATED ALWAYS AS
 (json_unquote(json_extract(`doc`,_utf8mb4'$._id'))) STORED NOT NULL,
  `_json_schema` json GENERATED ALWAYS AS 
  (_utf8mb4'{"type":"object"}') VIRTUAL,
  PRIMARY KEY (`_id`),
  CONSTRAINT `$val_strict_B70EB65BDDBAB20B0EE5BB7532C9060C422A06F8` …

WooCommerce block product editor | Escaping output in PHP and Laravel | SQL must go | GitHub and MySQL v8. OpenLampTech is a media and content source for PHP, MySQL, and the LAMP stack.

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Josh Otwell has a passion to grow as a PHP Developer, SQL expert, and technical blogger/writer.

Disclaimer: The majority of examples in this post, are performed in a personal development/learning …

Since the release of MySQL 8.0, the MySQL X Dev API has provided users with the convenient ability to utilize MySQL without the need to write a single line of SQL!

MySQL X Dev API brings the support for CRUD operations on JSON documents that are stored in MySQL. MySQL Document Store is ACID compliant and is compatible with everything MySQL like replication, InnoDB Cluster, …

The MySQL X Dev API is available using the MySQL X Protocol, listening by default on port 33060.

If you are interested in learning more about MySQL Document Store, please refer to the these presentations [1], [2], [ …

Error logging is a critical aspect of database administration, providing insights into issues, warnings, and errors that may affect the system’s stability and performance. MySQL 8 introduces Error Log Filtering as a mechanism to fine-tune the error log, allowing administrators to focus on the most critical issues. By assigning priorities to different error types, administrators […]

Long-time web developer Christian Olear shares an insightful developer interview with the OpenLampTech newsletter readers.

The Newsletter for PHP and MySQL Developers

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Spanning two-plus decades, Christian Olear has programmed using Laravel, the Zend framework, and Symfony to name just a few, in addition to vanilla PHP.

Head on over and grab your free subscription to OpenLampTech to read this developer interview and more.

Thank you for reading this post. Please share it with someone else …

Some time ago, we saw how we could deploy WordPress on OCI using MySQL HeatWave Database Service with Read Replicas. We had to modify WordPress to use a specific plugin that configures the Read/Write Splitting on the application (WordPress): LudicrousDB.

Today, we will not modify WordPress to split the Read and Write operations, but we will use MySQL Router 8.2.0 (see [1], [2], [3]).

Architecture

The …

In Percona Managed Services, we manage Percona for MySQL, Community MySQL, and MariaDB. Sometimes, the replica server might have replication errors, and the replica might be out of sync with the primary. In this case, we can use Percona Toolkit’s pt-table-checksum and pt-table-sync to check the data drift between primary and replica servers and make […]

In a recent podcast on Mastering EOL Migrations: Lessons learned from MySQL 5.7 to 8.0 I discuss with my colleague Adam North not only the technical issues that become a major migration but also key business and management requirements with having a well-articulated strategy that covers:

• Planning
• Testing
• Be Prepared
• Proactiveness

Having a plan is key to any significant task including data migrations. You should heed the warnings and the deprecations and consider all potential downstream product impacts such as connector upgrades. The plan includes a timeline but also needs to define all the stakeholders both technical and business, the definition of a successful migration, and most importantly the decision tree for a non-successful migration that would …