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queries.factor
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queries.factor
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! Copyright (C) 2008 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: accessors arrays byte-arrays classes combinators
continuations db db.errors db.private db.tuples
db.tuples.private db.types destructors kernel make math
math.bitwise math.intervals math.parser namespaces nmake
prettyprint random sequences shuffle strings words fry ;
IN: db.queries
GENERIC: where ( specs obj -- )
SINGLETON: retryable
: make-retryable ( obj -- obj' )
dup sequence? [
[ make-retryable ] map
] [
retryable >>type
10 >>retries
] if ;
: maybe-make-retryable ( statement -- statement )
dup in-params>> [ generator-bind? ] any?
[ make-retryable ] when ;
: regenerate-params ( statement -- statement )
dup
[ bind-params>> ] [ in-params>> ] bi
[
dup generator-bind? [
generator-singleton>> eval-generator >>value
] [
drop
] if
] 2map >>bind-params ;
M: retryable execute-statement* ( statement type -- )
drop [ retries>> iota ] [
[
nip
[ query-results dispose t ]
[ ]
[ regenerate-params bind-statement* f ] cleanup
] curry
] bi attempt-all drop ;
: sql-props ( class -- columns table )
[ db-columns ] [ db-table-name ] bi ;
: query-make ( class quot -- statements )
#! query, input, outputs, secondary queries
over db-table-name "table-name" set
[ sql-props ] dip
[ 0 sql-counter rot with-variable ] curry
{ "" { } { } { } } nmake
[ <simple-statement> maybe-make-retryable ] dip
[ [ 1array ] dip append ] unless-empty ; inline
: where-primary-key% ( specs -- )
" where " 0%
find-primary-key [
" and " 0%
] [
dup column-name>> 0% " = " 0% bind%
] interleave ;
M: db-connection <update-tuple-statement> ( class -- statement )
[
"update " 0% 0%
" set " 0%
dup remove-id
[ ", " 0% ] [ dup column-name>> 0% " = " 0% bind% ] interleave
where-primary-key%
] query-make ;
M: random-id-generator eval-generator ( singleton -- obj )
drop
system-random-generator get [
63 [ random-bits ] keep 1 - set-bit
] with-random ;
: interval-comparison ( ? str -- str )
"from" = " >" " <" ? swap [ "= " append ] when ;
: (infinite-interval?) ( interval -- ?1 ?2 )
[ from>> ] [ to>> ] bi
[ first fp-infinity? ] bi@ ;
: double-infinite-interval? ( obj -- ? )
dup interval? [ (infinite-interval?) and ] [ drop f ] if ;
: infinite-interval? ( obj -- ? )
dup interval? [ (infinite-interval?) or ] [ drop f ] if ;
: where-interval ( spec obj from/to -- )
over first fp-infinity? [
3drop
] [
pick column-name>> 0%
[ first2 ] dip interval-comparison 0%
bind#
] if ;
: in-parens ( quot -- )
"(" 0% call ")" 0% ; inline
M: interval where ( spec obj -- )
[
[ from>> "from" where-interval ] [
nip infinite-interval? [ " and " 0% ] unless
] [ to>> "to" where-interval ] 2tri
] in-parens ;
M: sequence where ( spec obj -- )
[
[ " or " 0% ] [ dupd where ] interleave drop
] in-parens ;
M: byte-array where ( spec obj -- )
over column-name>> 0% " = " 0% bind# ;
M: NULL where ( spec obj -- )
drop column-name>> 0% " is NULL" 0% ;
: object-where ( spec obj -- )
over column-name>> 0% " = " 0% bind# ;
M: object where ( spec obj -- ) object-where ;
M: integer where ( spec obj -- ) object-where ;
M: string where ( spec obj -- ) object-where ;
: filter-slots ( tuple specs -- specs' )
[
slot-name>> swap get-slot-named
dup double-infinite-interval? [ drop f ] when
] with filter ;
: many-where ( tuple seq -- )
" where " 0% [
" and " 0%
] [
2dup slot-name>> swap get-slot-named where
] interleave drop ;
: where-clause ( tuple specs -- )
dupd filter-slots [ drop ] [ many-where ] if-empty ;
M: db-connection <delete-tuples-statement> ( tuple table -- sql )
[
"delete from " 0% 0%
where-clause
] query-make ;
ERROR: all-slots-ignored class ;
M: db-connection <select-by-slots-statement> ( tuple class -- statement )
[
"select " 0%
[ dupd filter-ignores ] dip
over empty? [ all-slots-ignored ] when
over
[ ", " 0% ]
[ dup column-name>> 0% 2, ] interleave
" from " 0% 0%
where-clause
] query-make ;
: do-group ( tuple groups -- )
dup string? [ 1array ] when
[ ", " join " group by " glue ] curry change-sql drop ;
: do-order ( tuple order -- )
dup string? [ 1array ] when
[ ", " join " order by " glue ] curry change-sql drop ;
: do-offset ( tuple n -- )
[ number>string " offset " glue ] curry change-sql drop ;
: do-limit ( tuple n -- )
[ number>string " limit " glue ] curry change-sql drop ;
: make-query* ( tuple query -- tuple' )
dupd
{
[ group>> [ drop ] [ do-group ] if-empty ]
[ order>> [ drop ] [ do-order ] if-empty ]
[ limit>> [ do-limit ] [ drop ] if* ]
[ offset>> [ do-offset ] [ drop ] if* ]
} 2cleave ;
M: db-connection query>statement ( query -- tuple )
[ tuple>> dup class ] keep
[ <select-by-slots-statement> ] dip make-query* ;
! select ID, NAME, SCORE from EXAM limit 1 offset 3
M: db-connection <count-statement> ( query -- statement )
[ tuple>> dup class ] keep
[ [ "select count(*) from " 0% 0% where-clause ] query-make ]
dip make-query* ;
: create-index ( index-name table-name columns -- )
[
[ [ "create index " % % ] dip " on " % % ] dip "(" %
"," join % ")" %
] "" make sql-command ;
: drop-index ( index-name -- )
[ "drop index " % % ] "" make sql-command ;
: create-database ( string -- )
"create database " ";" surround sql-command ;
: ensure-database ( string -- )
'[ _ create-database ] ignore-database-exists ;