I want to get database based on user id by a get method using esql in IBM app connect, so how can I do that

Question

how to access the query param by esql?

SET OutputRoot.JSON.Data.customer_details[] = 
  PASSTHRU('SELECT* FROM customers.customer WHERE customer_id =InputRoot.JSON.Data.customer_id');
SET OutputRoot.JSON.Data.customer_details[]= PASSTHRU('SELECT * FROM customers.customer WHERE customer_id =InputRoot.JSON.Data.customer_id');