Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

You could describe the rules in XML:

<table name="foo"> <field name="a" required="1"/> <field name="b" validate="\d+\.\d+\.\d+"/> <field name="c" required="if a"/> </table>

These could be easily translated to perl:

package Model::Validate::Foo; sub on_insert { my %value_of = @_; if ( !$value_of{a} ) { die "a is required"; } if ( $value_of{b} !~ /\d+\.\d+\.\d+/ ) { die "invalid b"; } if ( !$value_of{c} ) { die "c is required if a" if $value_of{a}; } }

Or, perhaps you could have constraints declared like this:

<table name="foo"> ... <constraint name="avg_a" value="average(a) > 100"/> </table>

Which would generate a sub like:

sub avg_a { # called on insert, update of table foo # check if average(a) > 100 }

In reply to Re: Fishing for constraint => SQL designs by nferraz
in thread Fishing for constraint => SQL designs by bsb

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (5)
As of 2022-05-20 10:12 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (73 votes). Check out past polls.