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I've been trying to do: $mydb = new wpdb(SQL Database info);

Is there a way to check whether the database connection was established? It doesn't seem to be working since $mydb->get_results(query) doesn't return anything, but I get no errors so I don't know what is wrong.

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As per the WordPress documentation you cannot connect to another DB using wpdb.

https://codex.wordpress.org/Class_Reference/wpdb

You best bet is to connect to the DB separately.

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