在eXist-db 4.4,XQuery 3.1中,我正在使用自动化来压缩许多xml文件。问题在于,当他们压缩时,它们仅存储文本内容,而不存储xml内容。
此功能使用compression:zip
从一批文档中创建一个zip:
declare option exist:serialize "expand-xincludes=no";
declare option exist:serialize "method=xml media-type=application/xml";
declare function zip:create-zip-by-batch()
{
[...]
let $zipobject := compression:zip(zip:get-entry-for-zip($x,false())
let $zipname := "foozipname.zip"
let $store := xmldb:store("/db/foodirectory", $zipname, $zipobject)
return $store
};
上面的代码调用此函数,在该函数中,文档被序列化并按documentation放入<entry>
:
declare option exist:serialize "expand-xincludes=no";
declare option exist:serialize "method=xml media-type=application/xml";
declare function zip:get-entry-for-zip($x)
{
[...for each $foo document in $x, create an <entry>...]
let $serialized := serialize($foo, map { "method": "xml" })
let $entry =
<entry name="somefooname" type='xml' method='store'>
{$serialized}
</entry>
[...return a sequence of $entry...]
}
我认为它缺少用于序列化的配置,但我无法弄清楚...
在此先感谢您的帮助。
答案 0 :(得分:3)
这里有一个关于eXist的查询,展示了如何将XML文档压缩成ZIP文件并将其存储到数据库中:
xquery version "3.1";
(: create a test collection with 10 test files: 1.xml = <x>1</x>
thru 10.xml = <x>10</x> :)
let $prepare := xmldb:create-collection("/db", "test")
let $populate := (1 to 10) ! xmldb:store("/db/test", . || ".xml", <x>{.}</x>)
(: construct zip-bound <entry> elements for the documents in the test collection :)
let $entries := collection("/db/test") !
<entry name="{util:document-name(.)}" type="xml" method="store">{
serialize(., map { "method": "xml" })
}</entry>
(: compress the entries and store in database :)
let $zip := compression:zip($entries, false())
return
xmldb:store("/db", "test.zip", $zip)
生成的ZIP文件包含10个完整的测试XML文档。有关显示如何将ZIP文件写入文件系统上某个位置的变体,请参见https://gist.github.com/joewiz/aa8d84500b1f1478779cdf2cc1934348。
要更全面地讨论eXist中的序列化选项,请参阅我对先前问题的回答:https://stackoverflow.com/a/49290616/659732。