I'm currently spec'ing out some code, and there is a requirement to place dependencies on database entries, i.e.:

• Entry cannot be made unless other entry x exists and has date within x months
• Entry cannot be made unless other entry y does not exist.
• Entry cannot be made unless other entry z exists or (other entry xx and other entry yy don't exist)

I want to place this logic in a database table, so that the logic is configurable, and in a human readable format. The obvious way is with statements like:

• X indate <period>
• y notexist
• z exist or (xx notexist and yy notexist)

I've dug around cpan with all the search terms I can think of, and can't find anything that does anything like this. Does anyone know of anything appropriate?

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.