count-tuples ( query/tuple -- n )
High-level tuple/database integration » High-level tuple/database words

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select-tuples ( query/tuple -- tuples )

Vocabulary
db.tuples

Inputs

query/tuple

a tuple

Outputs

n	an integer

Word description
Returns the number of items that would be returned if the query were a select query. Counting the tuples with this word is more efficient than calling length on the result of select-tuples.

See also
each-tuple, select-tuple, select-tuples

Definition

USING: accessors db.tuples.private kernel math.parser sequences
;

IN: db.tuples

: count-tuples ( query/tuple -- n )
    >query [ tuple>> ] [ <count-statement> ] bi do-count
    [ first string>number ] map dup length 1 = [ first ] when ;