I need to know how to build a web scraper for an entire website [on hold]

I want to run a query through a website to find a particular item. Just like Web Scraping, i want to scrape through the entire site and find a particular item. I have tried phantom js and alsql but it doesn't give me what i quite want. e.g. run a query through the entire amazon website like this "select * where innerHTML === Blue jeans"