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
}
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