Should I use Google site search or a custom database search for my site?

I'm coding a resource site around a fairly large directory database, and 开发者_如何学CI'd like to make some kind of in-site search available for my visitors. I'm debating between whether to use Google's premade site search (which I can drop right into my template) or coding a custom search that accesses the database directly.

Obviously, the custom search will take alot more work - but if Google can't offer close to the level of results that a custom can, I'll do it. What do you think?

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Use the google search. It's what they do.

If you don't want to be dependant on them, then look at one of the free search utilities such as htdig. Or a plugin to whatever website engine you're using.