在PHP MySQL数据库中搜索价格

Question

I have code that searches for cars depending on your price range:

$category = "SELECT * FROM tbl_listings WHERE price between '$c[0]' AND '$c[1]'"; 

For some reason, that code doesn't work perfectly. It showed me a couple cars in the right range, but also showed one that is 200,000 when I was searching between 5,000 and 20,000.

Also, what is a good way to search when some cars have a price with a dollar sign in the database and some have commas? The search form is not returning anything with a dollar sign or commas.

Answer 1

Stop storing prices as strings? A price is typically stored as one of two types:

• integer: number of cents
• float: dollars and cents, but be sure to set the number of decimal places to 2

One doesn't generally store prices as strings (like "$14,999.99") in the database because you can't do range queries, like the one you're trying to do now.

You also can't do arithmetic, like a query that totals the prices of a particular subset of cars.

If the data you're pulling in has formatted strings like this, use NumberFormatter::parseCurrency() to get a float from the string you're given before shoving it in the DB. http://php.net/manual/en/numberformatter.parsecurrency.php

Answer 2

Your statement about

some cars have a price with a dollar sign in the database and some have commas

makes me think the datatype in the database are not numeric datatype. This can be an issue, even provided that your $c[0] is correctly the lower bound and $c[1] is the upper bound.