我正在努力使用XSLT。我被程序困住了。基本上,我有一些从数据库生成的XML看起来像这样:
<?xml version="1.0" encoding="iso-8859-1"?>
<report>
<generated_dtm>2013-03-08T18:57:26+00:00</generated_dtm>
<range>
<start_dtm>2013-02-21T17:52:00+00:00</start_dtm>
<end_dtm>2013-03-08T17:52:00+00:00</end_dtm>
</range>
<sensor site_code="A0001" unit_no="1" sensor_no="1">
<name>Food</name>
<mu_symbol>°C</mu_symbol>
</sensor>
<sensor site_code="A0001" unit_no="1" sensor_no="2">
<name>Air</name>
<mu_symbol>°C</mu_symbol>
</sensor>
<readings>
<slot slot_dtm="2013-02-21T17:50:00+00:00">
<sensor sensor_no="1">
<v>10</v>
<status_code>IR</status_code>
<status_desc>In Range</status_desc>
</sensor>
<sensor sensor_no="2">
<v>20</v>
<status_code>Lo</status_code>
<status_desc>Low</status_desc>
</sensor>
</slot>
<slot slot_dtm="2013-02-21T18:00:00+00:00">
<sensor sensor_no="2">
<v>21</v>
<status_code>Lo</status_code>
<status_desc>Low</status_desc>
</sensor>
<sensor sensor_no="1">
<v>11</v>
<status_code>IR</status_code>
<status_desc>In Range</status_desc>
</sensor>
</slot>
</readings>
</report>
我试图以HTML表中的读数结束,每个传感器是一列,每一行的时间在左边,像这样:
Time | Food | Air
-------------------------------------
2013-02-21T17:50:00+00:00 | 10 | 11
2013-02-21T18:00:00+00:00 | 20 | 22
虽然时隙的顺序保证是升序的,所以我不需要对它们进行排序(可能有1000个),但问题是,在每个时隙内,传感器的顺序不能得到保证,所以我想我会循环遍历我用来每次创建表头的传感器,并从每个槽中选择正确的传感器,因为我迭代了槽。虽然这不起作用,你可能会得到我试图做的(我现在意识到为什么它不起作用…变量的行为不符合我的预期!):-
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="report">
<html>
<head>
<title>Report</title>
</head>
<body>
<table border="0" width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="2">
<tr>
<td class="column_head_above" width="70">Time</td>
<xsl:for-each select="sensor">
<td class="column_head_above"><xsl:value-of select="name"/><xsl:text> </xsl:text><xsl:value-of select="mu_symbol"/></td>
</xsl:for-each>
</tr>
<!-- go through each time slot -->
<xsl:for-each select="readings/slot">
<tr>
<xsl:variable name="sdtm" select="@slot_dtm" />
<td class="table_data"><xsl:value-of select="$sdtm"/></td>
<!-- go through each sensor header -->
<xsl:for-each select="../sensor">
<xsl:variable name="sno" select="@sensor_no" />
<td>
<xsl:value-of select="../readings/slot[@slot_dtm=$sdtm]/sensor[@sensor_no=$sno]/v"/>
<xsl:value-of select="../readings/slot[@slot_dtm=$sdtm]/sensor[@sensor_no=$sno]/status_desc"/>
</td>
</xsl:for-each>
</tr>
</xsl:for-each>
<!-- end: go through each time slot -->
</table>
</body>
</html>
</xsl:template>
</xsl:stylesheet>
可以有100甚至1000个时隙,这只是一个小例子。如果有帮助的话,我可以调整XML的层次结构,但是如果不对数据库查询进行一些重做,我就不能在每个时隙内按顺序排列传感器。我希望这不是必要的。
最初我使用XML,其中槽是这样分开的:
<readings>
<slot slot_dtm="2013-02-21T17:50:00+00:00">
<sensor sensor_no="1">
<v>10</v>
<status_code>IR</status_code>
<status_desc>In Range</status_desc>
</sensor>
</slot>
<slot slot_dtm="2013-02-21T17:50:00+00:00">
<sensor sensor_no="2">
<v>20</v>
<status_code>Lo</status_code>
<status_desc>Low</status_desc>
</sensor>
</slot>
<slot slot_dtm="2013-02-21T18:00:00+00:00">
<sensor sensor_no="1">
<v>11</v>
<status_code>IR</status_code>
<status_desc>In Range</status_desc>
</sensor>
</slot>
<slot slot_dtm="2013-02-21T18:00:00+00:00">
<sensor sensor_no="2">
<v>21</v>
<status_code>Lo</status_code>
<status_desc>Low</status_desc>
</sensor>
</slot>
</readings>
涉及一个更简单的数据库查询!这里我可以保证顺序,但是我使用的XQuery处理器(Qt的QXmlQuery)不支持for-each-group,所以我找不到一种基于时间分组的方法。
对不起,这么长时间了,我希望有人能帮助我至少指给我正确的方向。
谢谢。
应该这样做:
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:variable name="allSensors" select="/report/sensor" />
<xsl:template match="report">
<html>
<head>
<title>Report</title>
</head>
<body>
<table border="0" width="100%" bgcolor="#ffffff"
cellspacing="0" cellpadding="2">
<tr>
<td class="column_head_above" width="70">Time</td>
<xsl:apply-templates select="sensor" />
</tr>
<xsl:apply-templates select="readings/slot" />
</table>
</body>
</html>
</xsl:template>
<xsl:template match="report/sensor">
<td class="column_head_above">
<xsl:value-of select="concat(name, ' ', mu_symbol)"/>
</td>
</xsl:template>
<xsl:template match="slot">
<xsl:variable name="currentSensors" select="sensor" />
<tr>
<td class="table_data">
<xsl:value-of select="@slot_dtm"/>
</td>
<xsl:apply-templates select="$allSensors/@sensor_no">
<xsl:with-param name="currentSlot" select="current()/@slot_dtm" />
</xsl:apply-templates>
</tr>
</xsl:template>
<xsl:template match="@sensor_no">
<xsl:param name="currentSlot" />
<td>
<xsl:variable name="matchingSensor"
select="/report/readings/slot[@slot_dtm = $currentSlot]
/sensor[@sensor_no = current()]" />
<xsl:value-of select="concat($matchingSensor/v, ' - ',
$matchingSensor/status_desc)" />
</td>
</xsl:template>
</xsl:stylesheet>
我在这里做了一些清理,但要点是:
- 保持对传感器定义的变量引用,以便于访问
- 创建当前槽位传感器的变量引用,可以在
for-each
内部引用。
当在示例输入上运行时,将产生:
<html>
<head>
<META http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Report</title>
</head>
<body>
<table border="0" width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="2">
<tr>
<td class="column_head_above" width="70">Time</td>
<td class="column_head_above">Food °C</td>
<td class="column_head_above">Air °C</td>
</tr>
<tr>
<td class="table_data">2013-02-21T17:50:00+00:00</td>
<td>10 - In Range</td>
<td>20 - Low</td>
</tr>
<tr>
<td class="table_data">2013-02-21T18:00:00+00:00</td>
<td>11 - In Range</td>
<td>21 - Low</td>
</tr>
</table>
</body>
</html>
这是花了一些时间弄清楚后的更新。也感谢JLRishe的回答。在这个和我已经解决的问题之间,它开始变得清晰(直到下一个问题!)。
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="report">
<html>
<head>
<title>Report</title>
</head>
<body>
<table border="0" width="100%" bgcolor="#ffffff" cellspacing="0" cellpadding="2">
<tr>
<td class="column_head_above" width="70">Time</td>
<xsl:apply-templates select="sensors/sensor">
<xsl:sort select="@sensor_no" />
</xsl:apply-templates>
</tr>
<!-- go through each time slot -->
<xsl:for-each select="readings/slot">
<tr>
<td class="table_data"><xsl:value-of select="@slot_dtm"/></td>
<!-- go through each sensor header -->
<xsl:apply-templates select="sensor">
<xsl:sort select="@sensor_no" />
</xsl:apply-templates>
</tr>
</xsl:for-each>
<!-- end: go through each time slot -->
</table>
</body>
</html>
</xsl:template>
<xsl:template match="slot/sensor">
<td>
<xsl:value-of select="@sensor_no"/> -
<xsl:value-of select="v"/> -
<xsl:value-of select="status_desc"/>
</td>
</xsl:template>
<xsl:template match="sensors/sensor">
<td class="column_head_above">
<xsl:value-of select="name"/><xsl:text> </xsl:text><xsl:value-of select="mu_symbol"/>
</td>
</xsl:template>
</xsl:stylesheet>