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PHP/MySQL: How to Store Queries in a Separate Include File

October 14, 2009DavidPHP, Programming2

When implementing a php/mysql database (or any database for that matter), it’s sometimes easy to have all of the queries located in one place, as opposed to having them hard-coded into the pages. If the queries are hard-coded in, and the queries are reused on multiple pages (which they often are), it can be a cumbersome task to update all of the queries. Having hard-coded queries also makes for larger, bulkier pages, which makes it harder to visualize the rest of the code on the page.

The following method is a simple solution to store all of your queries in one file and access them as needed. Please note that I am not advocating this as a “best practice” as there are many great articles on how to truly separate your presentation layer and your data layer, but this works.

I always have a database.php file that stores the connection data and has the related connection functions. So to continue with this “separation” concept, create a queries.php file.

To this file I simply add a variable that stores the specific query. So for example, I would add the following variables:

$getAuthors = "SELECT * FROM authors";
$getBooks = "SELECT * FROM book";

and so on with your queries.

Turning to the page that displays the results — the one that actually uses the query — (lets call it authors.php), I have the include statement:

include "queries.php";

and of course the code to access my database:

link_id = db_connect();
[here you can use whatever particular code you personally use to connect to a mysql database]

Then I simply populate the $sql variable (where I previously would have stored the actual code of the query), with the following:

$sql = $getAuthors;

To show you where it goes, I’m using the code: $result=mysql_query($sql) or DIE(mysql_error());

Again, the specifics don’t really matter other than that instead of hard-coding the sql query text for the $sql variable, you are simply referencing a variable in another file.

Now if you decide to update, change or modify the query, you can do it in one place — in the queries.php file.

So while this may not be the best method of handling this situation, it does work, and it does save time.

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  • neo85

    great idea thx man

  • Klaas

    Why not write functions that do the actual query and return the result set?
    function getAuthorsById($id) {
    $query = “SELECT id, name, ……. FROM authors a WHERE a.id == $id”;
    $result = mysql_query($query);
    if (! $result) {
    throw new Exception(mysql_error());
    }
    }

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