The use of String Constructor does not avoid the global read lock, but I
can see with some changes and a suitable set of conventions this could be
made to work.
Cheers
/Andy
<job id="job13" type="ScheduledXQuery" state="cached" user="admin"
duration="PT0.007S" reads="(global)" writes="(none)">count(
collection(``[BEP]``))</job>
On 20 September 2017 at 23:28, Christian Grün <christian.gr...@gmail.com>
wrote:
> > bxcode:inline-variables($xqcode-uri) as xs:string
> > @returns xquery code that is the source code from $xqcode-uri but with
> > inlining "constant" variables and operations applied
> >
> > This could be used as a preprocessor.
> > Is this something that could be created from the bits and pieces in the
> > current BaseX Java code?
>
> This reminds me of the discussion with Omar [1]: There is currently no
> way to generate a correct string representation for compiled code. In
> the GUI Info View, we output a string representation of the optimized
> query. In simple cases, this string is a valid and equivalent to the
> original query string, but it’s fairly easy to generate invalid
> results.
>
> If it’s an option for you to generate code in XQuery, something like
> the following could be done:
>
> _ bxcode.xqm _______
>
> module namespace bxcode = 'bxcode';
> declare function bxcode:bind-external-variables(
> $uri as xs:string,
> $vars as map(xs:string, xs:string)
> ) as xs:string {
> let $xqcode := unparsed-text($uri)
> return fold-left(
> map:keys($vars), $xqcode, function($string, $name) {
> let $value := replace($vars($name), ']``', '`{"]``"}`', 'q')
> return $string
> => replace('declare variable $' || $name || ' external;', '', 'q')
> => replace('$' || $name, '``[' || $value || ']``', 'q')
> }
> )
> };
>
> _ example.xq _______
>
> declare variable $db external;
> count(collection($db))
>
> _ run-bxcode.xq _______
>
> import module namespace bxcode = 'bxcode' at 'bxcode.xqm';
> bxcode:bind-external-variables('query.xq', map { 'db': 'BEP' })
>
> _ output _______
>
> count(collection(``[BEP]``))
>
> Cheers,
> Christian
>
> [1] https://www.mail-archive.com/basex-talk@mailman.uni-
> konstanz.de/msg09863.html
>
