In PLPGSQL, what is the method for obtaining a query plan and storing it in a table, by executing a dynamic query within an anonymous code block?

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To obtain a query plan and store it in a table by executing a dynamic query within an anonymous code block in PLPGSQL, you can use the following method:

DECLARE
    query_text text;
    plan_json json;
BEGIN
    query_text := 'SELECT * FROM table_name;';
    plan_json := (EXPLAIN (FORMAT JSON) EXECUTE query_text);
    INSERT INTO plan_table (query, plan)
    VALUES (query_text, plan_json);
END;

This code block declares a query_text variable to hold the dynamic SQL query, and a plan_json variable to hold the query plan in JSON format. The EXPLAIN command is used to obtain the query plan, and the EXECUTE command is used to execute the dynamic query.

The query plan is then stored in the plan_json variable, which is inserted into a plan_table along with the original query text using an INSERT statement.

Note that plan_table must be created beforehand, with columns query and plan to store the query text and plan data, respectively.