我有一个XSLT可以将XML输入转换为JSON,但是当其中一个group-by具有空值时,我遇到了问题。简而言之,我转换一个键/值对并将数据转出,这样我就可以将它插入到数据库中。我的问题是@TableName在某些情况下是空的(这会导致JSON输出中出现错误的逗号)并且我需要绕过它们,问题是我无法获得position()和last()因为它们没有&#39 ; t包含准确的值,因为TableName为空。我尝试过使用group-starting-with,但我无法正确使用语法。我愿意接受建议。示例XML输入到XSLT
<root xmlns:xs="http://www.w3.org/2001/XMLSchema">
<Metric measType="1526727077"
measResult="0"
endTime="2016-08-25T04:30:00-07:00"
measObjLdn="LTHBC0126858/HANS:Board Type=MPT, Cabinet No.=0, Subrack No.=1, Slot No.=7"
Element_Type="ENODEB"
Key1="LTHBC0126858"
TableName=""
ColumnName=""/>
<Metric measType="1526727075"
measResult="0"
endTime="2016-08-25T04:30:00-07:00"
measObjLdn="LTHBC0126858/GTPU:Board Type=MPT, Cabinet No.=0, Subrack No.=1, Slot No.=7"
Element_Type="ENODEB"
Key1="LTHBC0126858"
TableName="HH_ENODEB"
ColumnName="H1526727075"
H1526727075="0"/>
<Metric measType="1526727076"
measResult="0"
endTime="2016-08-25T04:30:00-07:00"
measObjLdn="LTHBC0126858/GTPU:Board Type=MPT, Cabinet No.=0, Subrack No.=1, Slot No.=7"
Element_Type="ENODEB"
Key1="LTHBC0126858"
TableName="HH_ENODEB"
ColumnName="H1526727076"
H1526727076="0"/>
<Metric measType="1526727077"
measResult="0"
endTime="2016-08-25T04:30:00-07:00"
measObjLdn="LTHBC0126858/DIFF:Board Type=MPT, Cabinet No.=0, Subrack No.=1, Slot No.=7"
Element_Type="ENODEB"
Key1="LTHBC0126858"
TableName="DIFF"
ColumnName="H1526727077"
H1526727077="0"/>
<Metric measType="1526737817"
measResult="0"
endTime="2016-08-25T04:30:00-07:00"
measObjLdn="LTHBC0126858/Board.Service:Board Type=BBP, Cabinet No.=0, Subrack No.=1, Slot No.=3"
Element_Type="Unknown"
Key1="Unknown"
TableName=""/>
</root>
我的XSLT中有一些伪造的<TEXT>
输出用于调试目的
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="2.0">
<xsl:output method="text" encoding="utf-8"/>
<xsl:strip-space elements="*"/>
<xsl:template match="root">
<xsl:text>{"root":{</xsl:text>
<xsl:text>"Table":[</xsl:text>
<xsl:for-each-group select="Metric" group-by="@measObjLdn">
<xsl:sort select="current-grouping-key()"/>
<xsl:variable name="curr_key" select="current-grouping-key()"/>
<xsl:for-each-group select="current-group()" group-by="@TableName">
<xsl:sort select="current-grouping-key()"/>
<xsl:variable name="curr_table" select="current-grouping-key()"/>
<xsl:text>Table</xsl:text>
<xsl:value-of select="$curr_table"/>
<xsl:if test="current-grouping-key() != ''">
<xsl:text>{"TableName":"</xsl:text>
<xsl:value-of select="current-grouping-key()"/>
<xsl:text>",</xsl:text>
<xsl:text>"Stamp":"</xsl:text>
<xsl:value-of select="@endTime"/>
<xsl:text>",</xsl:text>
<xsl:text>"measObjLdn":"</xsl:text>
<xsl:value-of select="$curr_key"/>
<xsl:text>",</xsl:text>
<xsl:text>"Element_Type":"</xsl:text>
<xsl:value-of select="@Element_Type"/>
<xsl:text>",</xsl:text>
<xsl:text>"Key1":"</xsl:text>
<xsl:value-of select="@Key1"/>
<xsl:text>"</xsl:text>
<xsl:for-each select="current-group()">
<xsl:for-each select="@*">
<xsl:if test="starts-with(name(), 'H')">
<xsl:text>,"</xsl:text>
<xsl:value-of select="name()"/>
<xsl:text>":"</xsl:text>
<xsl:value-of select="number(.)"/>
<xsl:text>"</xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
<xsl:text>}</xsl:text>
</xsl:if>
</xsl:for-each-group>
<xsl:text>position</xsl:text>
<xsl:value-of select="position()"/>
<xsl:text>last</xsl:text>
<xsl:value-of select="last()"/>
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each-group>
<xsl:text>]}}</xsl:text>
</xsl:template>
</xsl:stylesheet>
答案 0 :(得分:1)
在这种情况下你应该做的是对xsl:for-each-group
的空表名进行条件检查,如下所示:
<xsl:for-each-group select="current-group()[@TableName!='']" group-by="@TableName">
然后 position()
将按预期工作,它指的是所选节点集中节点的位置,而不是实际XML层次结构中的位置。
此外,您应该以类似的方式更改xsl:for-each-group
元素Metric
<xsl:for-each-group select="Metric[@TableName != '']" group-by="@measObjLdn">
试试这个XSLT
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" version="2.0">
<xsl:output method="text" encoding="utf-8"/>
<xsl:strip-space elements="*"/>
<xsl:template match="root">
<xsl:text>{"root":{</xsl:text>
<xsl:text>"Table":[</xsl:text>
<xsl:for-each-group select="Metric[@TableName != '']" group-by="@measObjLdn">
<xsl:sort select="current-grouping-key()"/>
<xsl:variable name="curr_key" select="current-grouping-key()"/>
<xsl:for-each-group select="current-group()[@TableName!='']" group-by="@TableName">
<xsl:sort select="current-grouping-key()"/>
<xsl:variable name="curr_table" select="current-grouping-key()"/>
<xsl:text>{"TableName":"</xsl:text>
<xsl:value-of select="current-grouping-key()"/>
<xsl:text>",</xsl:text>
<xsl:text>"Stamp":"</xsl:text>
<xsl:value-of select="@endTime"/>
<xsl:text>",</xsl:text>
<xsl:text>"measObjLdn":"</xsl:text>
<xsl:value-of select="$curr_key"/>
<xsl:text>",</xsl:text>
<xsl:text>"Element_Type":"</xsl:text>
<xsl:value-of select="@Element_Type"/>
<xsl:text>",</xsl:text>
<xsl:text>"Key1":"</xsl:text>
<xsl:value-of select="@Key1"/>
<xsl:text>"</xsl:text>
<xsl:for-each select="current-group()">
<xsl:for-each select="@*">
<xsl:if test="starts-with(name(), 'H')">
<xsl:text>,"</xsl:text>
<xsl:value-of select="name()"/>
<xsl:text>":"</xsl:text>
<xsl:value-of select="number(.)"/>
<xsl:text>"</xsl:text>
</xsl:if>
</xsl:for-each>
</xsl:for-each>
<xsl:text>}</xsl:text>
</xsl:for-each-group>
<xsl:if test="position() != last()">
<xsl:text>,</xsl:text>
</xsl:if>
</xsl:for-each-group>
<xsl:text>]}}</xsl:text>
</xsl:template>
</xsl:stylesheet>
这会生成以下JSON
{
"root":{
"Table":[
{
"TableName":"DIFF",
"Stamp":"2016-08-25T04:30:00-07:00",
"measObjLdn":"LTHBC0126858/DIFF:Board Type=MPT, Cabinet No.=0, Subrack No.=1, Slot No.=7",
"Element_Type":"ENODEB",
"Key1":"LTHBC0126858",
"H1526727077":"0"
},
{
"TableName":"HH_ENODEB",
"Stamp":"2016-08-25T04:30:00-07:00",
"measObjLdn":"LTHBC0126858/GTPU:Board Type=MPT, Cabinet No.=0, Subrack No.=1, Slot No.=7",
"Element_Type":"ENODEB",
"Key1":"LTHBC0126858",
"H1526727075":"0",
"H1526727076":"0"
}
]
}
}