64 lines
1.8 KiB
Forth
64 lines
1.8 KiB
Forth
This is an experimental set of words allowing use of sqlite3
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within RETRO.
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Do not use this in anything public facing. It doesn't do any
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error checking, input validation, or make any attempt to be
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remotely secure. It's also slow due to its design.
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A lot of work is needed for this to actually be useful outside
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of my tests.
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This works by opening pipes to sqlite3, capturing the output,
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and then processing it from within RETRO. This is slow, but
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allows me to not need to deal with adding an FFI, and is
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adaptable to similar external tools.
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~~~
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{{
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'Database var
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:setup here buffer:set ;
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:pipe @Database 'sqlite3_%s_'%s' s:format file:R unix:popen ;
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---reveal---
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:sql:set-database s:keep !Database ;
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:sql:query
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[ setup pipe [ dup file:read dup buffer:add n:-zero? ] while unix:pclose ] buffer:preserve here ASCII:LF s:tokenize dup v:dec ;
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:sql:split-line (s-a) $| s:tokenize ;
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}}
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~~~
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# Construct an SQL Statement
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~~~
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{{
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{ 'Action 'Choice 'Table 'Clause } [ var ] a:for-each
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:clear { &Action &Choice &Table &Clause } [ v:off ] a:for-each ;
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---reveal---
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:SELECT 'SELECT !Action !Choice ;
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:DROP 'DROP !Action ;
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:FROM !Table ;
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:WHERE !Clause ;
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:sql:statement (q-s)
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clear call @Clause n:-zero?
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[ @Clause @Table @Choice @Action '%s_%s_FROM_%s_WHERE_%s ]
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[ @Table @Choice @Action '%s_%s_FROM_%s ] choose
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s:format ;
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}}
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~~~
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# Generate Accessor Words
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~~~
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{{
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'Table var
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:set-table (s-s) dup s:keep !Table ;
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:get-columns (s-a) 'PRAGMA_table\_info("%s") s:format sql:query ;
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:id (a-n) #0 a:th fetch s:to-number ;
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:column (a-s) #1 a:th fetch @Table '%s:%s s:format ;
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:generate (ns-) d:create , [ fetch a:th fetch ] does ;
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---reveal---
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:sql:accessors-for (s-)
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set-table get-columns
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[ sql:split-line [ id ] [ column ] bi generate ] a:for-each ;
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}}
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~~~
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