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dbplus_find() will place a
constraint on the given relation. Further calls to functions
like
dbplus_curr() or
dbplus_next() will only return
tuples matching the given constraints.
Constraints are triplets of strings containing of a
domain name, a comparison operator and a comparison value.
The constraints parameter
array may consist of a collection of string arrays, each of
which contains a domain, an operator and a value, or of a
single string array containing a multiple of three
elements.
The comparison operator may be one of the following
strings: '==', ' ', ' =', ' ', ' =', '!=', '~'
for a regular expression match and 'BAND' or 'BOR' for
bitwise operations.
See also dbplus_unselect().