Search Engine And SQL

You need to be more specific in your question.

If you're talking about gaining access to your database, and reading the rows, no.

If you're talking about how your page pulls data from your database onto the page, yes. That is content just as if you hand coded it (right click > "View Source" shows you this).

I think, what Betadog means is that, if all his content (such as links) are in a database and a search engine tries to crawl his site, will it [the search engine] be able to read the content?

Don't think about how the content gets onto the page (that's not important to the search engines). Think about what's there.

When you look at your page in your browser do you see the links that you want the SEs to see?
The SEs can't fill in forms or click buttons, so they won't go to any pages that require interaction to get to (unless you have a text link to that page).

One of the best ways to make sure your whole site gets spidered is to have a good site map to all the major areas of your site linked from the home page. SEs will follow all the text links on your pages until it runs into a page that either doesn't have any links to a new page it hasn't spidered or until it sees a meta tag that says ignore this page.

Does that help?

**Disclaimer** At least this is how it used to work in the olden days.