首页 \ 问答 \ 在Freemarker模板中访问带有命名空间的DOM元素(Accessing DOM element with namespace in Freemarker template)

在Freemarker模板中访问带有命名空间的DOM元素(Accessing DOM element with namespace in Freemarker template)

 我有以下XML  
<wmi xmlns="http://www.exmple.com/XMLSchema/fulfillment/v1/order/orderShipment" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.com/XMLSchema/fulfillment/v1/order/orderShipment OrderShipmentNotification.xsd">
<wmiHeader>
    <fileID>693401.20160229.130342.3541254</fileID>
    <version>2.0.0</version>
    <messageType>FSN</messageType>
    <genDate>2016-02-29T13:03:42Z</genDate>
    <from>
    </from>
</wmiHeader>
<orderShipNotification>
    <shipmentHeader dateTimeCreated="2016-02-29T13:03:42Z" requestNumber="2574445351883" />
    <shipmentDetails actualShipmentDateTime="2016-02-29T12:18:54Z" carrierCode="XX" carrierMethodCode="XX-01">
        <shipmentPackDetails trackingNumber="9361289672090007124848" trackingURL="https://example.com/go/TrackConfirmAction_input?qtc_tLabels1=323434">
            <shipmentPackLineDetails requestLineNumber="1" partnerItemID="FXT-CC-LB" itemQtyShipped="1" />
        </shipmentPackDetails>
    </shipmentDetails>
</orderShipNotification>
</wmi>
 
 当我尝试访问时，我在Freemarker模板中收到错误。  
${orderShipNotification.shipmentDetails.@actualShipmentDateTime[0]!""}
 
 如果我从文档中删除命名空间，它工作正常。 我从XML中删除了以下内容  
xmlns="http://www.exmple.com/XMLSchema/fulfillment/v1/order/orderShipment" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.com/XMLSchema/fulfillment/v1/order/orderShipment OrderShipmentNotification.xsd"
 
 我做了一些调查。 这是一个ftl指令。 但目前尚不清楚这将如何解决问题。 请让我知道如何访问属性。  
 http://freemarker.incubator.apache.org/docs/ref_directive_ftl.html#ref.directive.ftl

I have the following XML  
<wmi xmlns="http://www.exmple.com/XMLSchema/fulfillment/v1/order/orderShipment" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.com/XMLSchema/fulfillment/v1/order/orderShipment OrderShipmentNotification.xsd">
<wmiHeader>
    <fileID>693401.20160229.130342.3541254</fileID>
    <version>2.0.0</version>
    <messageType>FSN</messageType>
    <genDate>2016-02-29T13:03:42Z</genDate>
    <from>
    </from>
</wmiHeader>
<orderShipNotification>
    <shipmentHeader dateTimeCreated="2016-02-29T13:03:42Z" requestNumber="2574445351883" />
    <shipmentDetails actualShipmentDateTime="2016-02-29T12:18:54Z" carrierCode="XX" carrierMethodCode="XX-01">
        <shipmentPackDetails trackingNumber="9361289672090007124848" trackingURL="https://example.com/go/TrackConfirmAction_input?qtc_tLabels1=323434">
            <shipmentPackLineDetails requestLineNumber="1" partnerItemID="FXT-CC-LB" itemQtyShipped="1" />
        </shipmentPackDetails>
    </shipmentDetails>
</orderShipNotification>
</wmi>
 
I am getting error in Freemarker template when I am trying to access. 
${orderShipNotification.shipmentDetails.@actualShipmentDateTime[0]!""}
 
If I delete the namespaces from the document it is working fine. I deleted the following content from the XML 
xmlns="http://www.exmple.com/XMLSchema/fulfillment/v1/order/orderShipment" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.com/XMLSchema/fulfillment/v1/order/orderShipment OrderShipmentNotification.xsd"
 
I did some investigation. The is a ftl directive. But it is still not clear how this will solve the problem. Please let me know how I can access the attributes. 
 http://freemarker.incubator.apache.org/docs/ref_directive_ftl.html#ref.directive.ftl

原文：https://stackoverflow.com/questions/35712198

更新时间：2024-04-11 22:04

最满意答案

 数据库使用索引 。 这样，它可以快速找到与给定用户ID相关的数据。  
 取决于索引结构，占用空间等...有一个增益，即它不是搜索N列，而是搜索 - 例如 - log(N) 。 通过二十亿行的二分法搜索  
N = 100,000,000,000
 
 将会  
Search(N) : search log2(N) = search (36 rows)
 
 相反，搜索10 ^ 12行，只需要分析36行。  
 在你提到的情况下，朋友，每个用户可能有几个朋友，所以  
user1 => (userX, userY, userZ, ...)
userX => (userU, userV, user1, ...)
 
 意思是user1是userX，userY等的朋友...即你没有每个用户的唯一索引。 但是每个用户都有一个唯一的索引。  
 在Mysql上会是  
UNIQUE(user1,user2)
 
 意味着情侣（user1，user2）在表格中只有一次。 语法是  
CREATE UNIQUE INDEX friendsindex ON friends(user1,user2)
 
 friendsindex是索引名称， 朋友是表。 或者如您所说，将表主键声明为(user1,user2) （每个表的主键是唯一的）。  
 -  
 赢得游戏的策略基于相同的原则，该策略包括找到给定对象的确切价格。 假设价格在1到10000之间。你告诉价格，处理程序说+或- 。 您必须尽可能少地尝试查找价格。 例如价格是6000。  
 您可以从1开始并将所有价格都提供到6000 （即6000次尝试），但您也可以继续进行二分法  
 
  你：5000  
  游戏玩家：+  
  7500或（10000 - 5000）/ 2  
  -  
  6250或（7500 - 5000）/ 2  
  -  
  等等...  
 
 在每次迭代时将剩余范围除以2。 而不是6000次尝试，您可以在12次尝试中找到（log2（6000））。  
 -  
 关于对数  
 例如，如何在2^x = 1024找到x？ 或者x = log2(1024)表示基数2中的对数为1024 （答案：10）。 在我们的故事中，具有基于二叉树的索引的1024行表需要10次尝试（最大）才能找到正确的元素（而不是1024最大值）。 

The database makes use of indexes. This way it can find quickly data related to a given userID. 
Depending on the index structure, space occupation etc... there is a gain, i.e. instead of searching N columns, it searches - for instance - log(N). A search by dichotomy of 100 billions rows 
N = 100,000,000,000
 
would be 
Search(N) : search log2(N) = search (36 rows)
 
Instead a searching 10^12 rows, only 36 rows have to be analyzed. 
In the case you mention, friends, each user may have several friends, so 
user1 => (userX, userY, userZ, ...)
userX => (userU, userV, user1, ...)
 
meaning user1 is friend with userX, userY etc... ie you don't have a unique index per user. But you have a unique index per couple of users. 
on Mysql that would be 
UNIQUE(user1,user2)
 
meaning the couple (user1,user2) is only once in the table. The syntax would be 
CREATE UNIQUE INDEX friendsindex ON friends(user1,user2)
 
friendsindex being the index name, friends being the table. Or as you said, declaring the table primary key to be (user1,user2) (primary keys are unique per table). 
-- 
The strategy to win a game that consists of finding the exact price of a given object is based on the same principle. Say the price is between 1 and 10000. You tell a price, and the handler says + or -. You have to find the price in as less tries as possible. E.g. the price is 6000. 
You could start from 1 and give all prices until 6000 (ie 6000 tries), but you could also proceed by dichotomy 
 
 you: 5000 
 gamer: + 
 7500 or (10000 - 5000)/2 
 - 
 6250 or (7500 - 5000)/2 
 - 
 etc... 
 
you divide the remaining range by 2 at each iteration. Instead of 6000 tries, you can find in 12 tries (log2(6000)). 
-- 
About logarithms 
For instance, how to find x in 2^x = 1024? Or x = log2(1024) meaning logarithm of 1024 in base 2 (answer: 10). In our story, a 1024 rows table having an index based on a binary tree would need 10 tries (max) to find the right element (instead of 1024 max).

在Freemarker模板中访问带有命名空间的DOM元素(Accessing DOM element with namespace in Freemarker template)

最满意答案

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