How Can I Query Multiple WordPress Databases Simultaneously to Retrieve Plugin Settings?

Accessing Multiple Databases Simultaneously

Querying data across multiple databases can be a common challenge when managing multiple database instances, such as in the case of WordPress sites with separate databases. To tackle this, let's explore how to retrieve plugin settings stored across different databases into a single result set.

Case Explanation:

The given scenario requires querying the 'active_plugins' option stored in the 'wp_options' table in multiple databases. The goal is to extract all active plugin settings into a unified result set.

Resolving the Challenge:

To access data from different databases and combine the results, we can utilize the UNION operator. The UNION operator combines the results of multiple SELECT statements into a single result set, removing duplicates.

Query Formulation:

The following query will achieve the desired result:

SELECT option_value
FROM `database1`.`wp_options`
WHERE option_name="active_plugins"
UNION
SELECT option_value
FROM `database2`.`wp_options`
WHERE option_name="active_plugins"

In this query, we issue two SELECT statements, one for each database, and combine them using the UNION operator. The option_name filter ensures we retrieve only the 'active_plugins' option.

By executing this query, you will obtain a unified result set containing the active plugin settings from both databases, allowing you to analyze and update them as needed.

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