Changes

{{Mark|Updated with Version 8.57}}:{{code|pass}} <code>base-uri</code> option added.

|{{Func|xquery:eval|$query as xs:string|item()*}}<br />{{Func|xquery:eval|$query as xs:string, $bindings as map(*)?|item()*}}<br />{{Func|xquery:eval|$query as xs:string, $bindings as map(*)?, $options as map(xs:string, xs:string)|item()*}}<br />

* {{Code|memory}}: query execution will be interrupted if the specified number of megabytes will be exceeded. This check works best if only one process is running at the same time. Moreover, please note that this option enforces garbage collection, so it will take some additional time, and it requires GC to be enabled in your JVM.* {{Code|base-uri}}: set [https://www.w3.org/TR/xquery-31/#dt-static-base-uri base-uri property] for the query. This URI will be used when resolving relative URIs by functions such as {{Code|fn:doc}}. Added with * {{VersionCode|8pass}}: passes on the original error info (line and column number, optional file uri).5By default, this option is {{Code|false}}.

|{{Func|xquery:update|$query as xs:string|item()*}}<br />{{Func|xquery:update|$query as xs:string, $bindings as map(*)?|item()*}}<br />{{Func|xquery:update|$query as xs:string, $bindings as map(*)?, $options as map(xs:string, xs:string)|item()}}<br />

==xquery:fork-joininvoke== {{Mark|Introduced with Version 8.5}}:

|{{Func|xquery:fork-joininvoke|$functions uri as functionxs:string|item()*}}<br />{{Func|xquery:invoke|$uri as xs:string, $bindings as map(*)?|item()*}}<br />{{Func|xquery:invoke|$uri as xs:string, $bindings as map(*)?, $options as map(*)|item()*}}<br />

|'''Summary'''|This function executes Evaluates the supplied (non-updating) functions in parallelXQuery module located at {{Code|$uri}} at runtime and returns the resulting items. A relative URI will be resolved against the static base URI of the query.<br/>Parallel query execution is recommendable if you have various calls that require a lot The rules of time, but cannot be sped up by rewriting the code. This is e. g. {{Code|$bindings}} and {{Code|$options}} parameters are the case if external URLs are called. If you are parallelizing local data reads (such same as accessing a database), your single-threaded query will usually be faster, because parallelized access to disk data will often lead to randomized access patterns, which can hardly be optimized by your HD or SSDfor [[#xquery:eval|xquery:eval]].

| '''ExamplesErrors'''|* The following function sleeps in parallel; it will be finished in 1 second if your system has at least 2 cores:<pre class='brush:xquery'>let $f := function() { prof:sleep(1000) {Error|BXXQ0001|#Errors}}return xquery:fork-join(($f, $f))the expression contains [[XQuery Update#Updating Expressions|updating expressions]].<br/pre>* In {{Error|BXXQ0003|#Errors}} insufficient permissions for evaluating the following query, up to four URLs will be requested in parallel:.<pre class='brush:xquery'br/>let $funcs := for $segment in 1 to 4 let $url := 'http://url.com/path' {{Error|BXXQ0004| $segment return function() { http:send-request((), $url) #Errors}}return xquery:fork-join($funcs)query execution exceeded timeout.<br/pre>|-|'''Errors'''|{{Error|BXXQ0006BXXQ0005|#Errors}} an unexpected nested query evaluation is not allowed.<br/>Any other error occurredthat may occur while evaluating the query.

=Parallelized Execution=xquery:invoke== Parallel query execution is recommendable if you have various calls that require a lot of time, but cannot be sped up by rewriting the code. This is e. g. the case if external URLs are called. If you are parallelizing local data reads (such as the access to a database), single-threaded queries will usually be faster, because parallelized access to disk data often results in randomized access patterns, which can hardly be optimized by the caching strategies of HD, SSD or operating system.

{{Mark|Updated with Version 8.5}}==xquery: Relative URIs will always be resolved against the static base URI of the query.fork-join==

|{{Func|xquery:invokefork-join|$uri functions as xs:string|itemfunction()*}}<br />{{Func|xquery:invoke|$uri as xs:string, $bindings as map(*)|item()*}}<br />{{Func|xquery:invoke|$uri as xs:string, $bindings as map(*), $options as map(*)|item()*}}<br />

| '''Summary'''|Evaluates This function executes the XQuery module located supplied (non-updating) functions in parallel.|-| '''Examples'''|* The following function sleeps in parallel; it will be finished in 1 second if your system has at least 2 cores:<pre class='brush:xquery'>let $f := function() {{Code|prof:sleep(1000) }return xquery:fork-join(($f, $uri}} at runtime and returns f))</pre>* In the resulting items. A relative URI following query, up to four URLs will be resolved against the static base URI of the queryrequested in parallel:<pre class='brush:xquery'>let $funcs := for $segment in 1 to 4 let $url := 'http://url.<br com/>The rules of the {{Codepath' ||$bindings}} and segment return function() {{Code|http:send-request((), $options}url) } parameters are the same as for [[#return xquery:eval|xquery:eval]].fork-join($funcs)</pre>

| '''Errors'''|{{Error|BXXQ0001BXXQ0006|#Errors}} the expression contains [[XQuery Update#Updating Expressions|updating expressions]].<br/>{{Error|BXXQ0003|#Errors}} insufficient permissions for evaluating the query.<br/>{{Error|BXXQ0004|#Errors}} query execution exceeded timeout.<br/>{{Error|BXXQ0005|#Errors}} nested query evaluation is not allowed.<br/>Any other an unexpected error that may occur while evaluating the queryoccurred.