XRX/词典编辑器

动机

你想要一个简单的应用程序，它为每个表单保存一个 XML 文件。你希望多个用户可以编辑各自的记录，而不会产生冲突。

设计

我们将每个词条放在一个单独的 XML 文件中，这些文件将按顺序编号 - 1.xml、2.xml，依此类推。每个文件定义一个词条、其缩写和其定义。

方法

创建一个新的 eXist 集合（如果你使用 WebDAV 工具，则称为文件夹），名为“dictionary”。
在“dictionary”集合中创建三个集合，名为“data”、“edit”和“views”。

data/1.xml

<Term>
   <id>1</id>
   <TermName>Hello</TermName>
   <TermDefinition>An informal greeting.</TermDefinition>
</Term>

data/2.xml

<Term>
   <id>2</id>
   <TermName>Howdy</TermName>
   <TermDefinition>An informal greeting used by cowboys.</TermDefinition>
</Term>

你的 XForms 应用程序将数据加载到一个实例中

<xf:instance src="1.xml"/>

你将 ID 号作为 URI 中的参数“id”传递给 XQuery “edit.xq”。“edit.xq”使用 ID 参数作为变量“$id”来构建表单。

edit/edit.xq 的内容

调用格式：edit.xq?id=1

xquery version "1.0";
let $id := request:get-paramter(id, '')
return

<html>
...
<xf:instance src="{$id}.xml"/>
<xf:submission method="post" action="save.xq"/>
...
</html>

new-instance.xml 的内容

<Term>
   <id/>
   <TermName/>
   <TermDefinition/>
</Term>

save.xq 的内容

xquery version "1.0";
declare namespace xmldb="http://exist-db.org/xquery/xmldb";

(: this is the collection where we store all the terms, one file per term :)
let $collection := '/db/dictionary/data'

(: this is where the form "POSTS" documents to this XQuery using the POST method of a submission :)
let $term := request:get-data()

(: this logs you into the collection :)
let $collection := xmldb:collection('/db/dictionary/data', 'mylogin', 'mypassword')

(: get the next ID :)
let $next-id := doc(concat($collection, 'edit/next-id.xml'))/next-id/text()
let $file := concat($next-id, 'xml')

(: this creates a new file using the next-id and saves the term into the file :)
let $store := store($collection, $file, $term)

(: now that the save has been done we can increment the next-id :)
let $update := update insert doc("/db/dictionary/edit/next-id.xml")/data/next-id/text() ($next-id + 1)

(: now put in the id in the file we just created :)
let $update := update insert doc( concat($collection, '/', $file) )/Term/id/text() $next-id

<results>
    <message>{$term/TermName/text(), $term/id/text()} has been saved.</message>
</results>

edit/next-id.xml 的内容

<data>
   <next-id>3</next-id>
</data>

views/list-terms.xq 的内容

随着你保存越来越多的词条，你可能想要创建一个词条列表。你可以创建一个 XQuery 来列出所有词条。对于每个词条，你可以包含一个链接来查看和编辑每个词条。

xquery version "1.0";

let $collection := '/db/dictionary/data'
return
<html>
   <head>
      <title>Listing of Dictionary Terms</title>
   </head>
   <body>
   <h1>Dictionary Terms</h1>
   <ol>{for $term in collection($collection)/Term
      let $id := $term/id/text() 
      return
         <li>{$term/TermName/text()} : {$term/Defintion/text()}
             <a href="view-term.xq?id={$id}">View</a>
             <a href="../edit/edit.xq?id={$id}">Edit</a>
         </li>
   }</ol>
   </body>
</html>

edit/update.xq 的内容

xquery version "1.0";
declare namespace xmldb="http://exist-db.org/xquery/xmldb";

(: update.xq :)

let $collection := '/db/dictionary/data'

(: this is where the form "POSTS" documents to this XQuery using the POST method of a submission :)
let $term := request:get-data()

(: this logs you into the collection :)
let $collection := xmldb:collection('/db/dictionary/data', 'mylogin', 'mypassword')

(: get the id out of the posted document :)
let $id := $term/id/text()
let $file := concat($id, '.xml')

(: this saves the new file and overwrites the old one :)
let $store := store($collection, $file, $term)

<results>
    <message>{$term/TermName/text(), $term/id/text()} has been updated.</message>
</results>

edit.xq 头部

edit.xq 从 URI 中获取参数（例如，在表单“edit.xq?id=2”中），并将新元素放入实例中，或者将现有元素放入实例中。

xquery version "1.0";
declare option exist:serialize "method=html media-type=text/html indent=yes";

let $new := request:get-parameter('new', '')
let $id := request:get-parameter('id', '')

return
(: check for required parameters :)
if (not($new or $id))
   then 
      <error>
           <message>Parameter "new" and "id" are both missing.  One of these two arguments is required for this web service.</message>
      </error>
   else
      let $server-port := substring-before(request:get-url(), '/exist/rest/db/') 
      let $collection := '/db/dictionary/data'

      (: put in the appropriate file name :)
      let $file := if ($new)
         then ('new-instance.xml')
         else ( concat( $server-port, '/exist/rest', $collection, '/', $id, '.xml'))
      return

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:xf="http://www.w3.org/2002/xforms" 
    xmlns:xs="http://www.w3.org/2001/XMLSchema" 
    xmlns:ev="http://www.w3.org/2001/xml-events" >
    <head>
       <title>Edit Term</title>
       <xf:model>
           <!-- this line loads either the new instance or the current data file into the form model -->
           <xf:instance xmlns="" src="{$file}"/>
       </xf:model>
    </head>
    <body>
       <xf:output ref="id">
           <xf:label>ID:</xf:label>
       </xf:output >
       <xf:input ref="TermName" class="TermName">
           <xf:label>Term:</xf:label>
       </xf:input>
       <xf:textarea ref="TermDefinition" class="TermDefinition">
           <xf:label>TermDefinition:</xf:label>
       </xf:textarea >
    </body>
</html>

xforms.css

以下文件可以链接到表单以进行格式化。[那个文件是什么？]

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