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MySQL:从格式异常的 XML 文件中提取数据

转载 作者:行者123 更新时间:2023-11-29 10:29:49 30 4
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我有一个 XML 文件,其中的条目如下所示:

<card name="Fire Toad" id="7366070c-c74d-4bb9-b3d8-23177e887073">
<property name="Sphere" value="Nature" />
<property name="Cost" value="1" />
<property name="Type" value="Creature" />
<property name="Subtype" value="Animal Toad" />
<property name="Attack" value="3" />
<property name="Defense" value="2" />
<property name="Gems" value="B" />
<property name="Rules" value="" />
<property name="Flavor" value="Fire toads have the uncanny ability to cook their food while chewing." />
<property name="Rarity" value="Common" />
<property name="Series" value="1" />
<property name="Number" value="106" />
<property name="Illustrator" value="Kevin Shoemaker" />
</card>

我想从中提取数据(对于每张卡:名称、ID 和所有属性)并将其插入 MySQL 数据库的表中。如果我可以使用内置的 LOAD XML 语句,那就太好了,但不幸的是它不支持我的文件格式。最方便的方法是什么?

最佳答案

考虑XSLT它与 SQL 很相似,是一种声明性的、专用的语言,但旨在将 XML 源转换为特定格式,例如 MySQL LOAD XML 所需的 XML。方法。 XSLT 可以通过 Bash/Powershell、任何通用语言(Java、C#、PHP、Perl、Python、R、VB)、专用处理器(例如 Saxon/Xalan)通过命令行运行。 ,甚至是您日常使用的 Excel!

事实上,您甚至可以通过向终端发送 shell 命令来直接从 MySQL 的命令行客户端运行 XSLT。这是一个xsltproc (适用于 Linux/Mac 的处理器)调用:

mysql> \! xsltproc -o /path/to/Output.xml /path/to/Script.xsl /path/to/Input.xml

下面的脚本解析到card节点并将property子节点迁移到新元素和值。

XSLT (另存为 .xsl,一种特殊的 .xml 文件)

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:template match="/root">
<data>
<xsl:apply-templates select="cards"/>
</data>
</xsl:template>

<xsl:template match="cards">
<xsl:apply-templates select="card"/>
</xsl:template>

<xsl:template match="card">
<row>
<name><xsl:value-of select="@name"/></name>
<id><xsl:value-of select="@id"/></id>
<xsl:apply-templates select="property"/>
</row>
</xsl:template>

<xsl:template match="property">
<xsl:element name="{@name}">
<xsl:value-of select="@value"/>
</xsl:element>
</xsl:template>

</xsl:stylesheet>

输入 XML (假设采用这种格式的结构,调整 XSLT 中的根名称)

<?xml version="1.0"?>
<root>
<more_nodes/>
<still_nodes/>
<cards>
<card name="Fire Toad 1" id="7366070c-c74d-4bb9-b3d8-23177e887073">
<property name="Sphere" value="Nature 1"/>
<property name="Cost" value="1"/>
<property name="Type" value="Creature 1"/>
<property name="Subtype" value="Animal Toad 1"/>
<property name="Attack" value="3"/>
<property name="Defense" value="2"/>
<property name="Gems" value="B1"/>
<property name="Rules" value=""/>
<property name="Flavor" value="Fire toads have the uncanny ability to cook their food while chewing. 1"/>
<property name="Rarity" value="Common 1"/>
<property name="Series" value="1"/>
<property name="Number" value="106"/>
<property name="Illustrator" value="Kevin Shoemaker 1"/>
</card>
<card name="Fire Toad 2" id="7366070c-c74d-4bb9-b3d8-23177e887073">
<property name="Sphere" value="Nature 2"/>
<property name="Cost" value="1"/>
<property name="Type" value="Creature 2"/>
<property name="Subtype" value="Animal Toad 2"/>
<property name="Attack" value="3"/>
<property name="Defense" value="2"/>
<property name="Gems" value="B2"/>
<property name="Rules" value=""/>
<property name="Flavor" value="Fire toads have the uncanny ability to cook their food while chewing. 2"/>
<property name="Rarity" value="Common 2"/>
<property name="Series" value="1"/>
<property name="Number" value="106"/>
<property name="Illustrator" value="Kevin Shoemaker 2"/>
</card>
<card name="Fire Toad 3" id="7366070c-c74d-4bb9-b3d8-23177e887073">
<property name="Sphere" value="Nature 3"/>
<property name="Cost" value="1"/>
<property name="Type" value="Creature 3"/>
<property name="Subtype" value="Animal Toad 3"/>
<property name="Attack" value="3"/>
<property name="Defense" value="2"/>
<property name="Gems" value="B3"/>
<property name="Rules" value=""/>
<property name="Flavor" value="Fire toads have the uncanny ability to cook their food while chewing. 3"/>
<property name="Rarity" value="Common 3"/>
<property name="Series" value="1"/>
<property name="Number" value="106"/>
<property name="Illustrator" value="Kevin Shoemaker 3"/>
</card>
</cards>
<other_nodes/>
</root>

输出 XML (为 MySQL 的 LOAD XML 做好准备)

<?xml version="1.0"?>
<data>
<row>
<name>Fire Toad 1</name>
<id>7366070c-c74d-4bb9-b3d8-23177e887073</id>
<Sphere>Nature 1</Sphere>
<Cost>1</Cost>
<Type>Creature 1</Type>
<Subtype>Animal Toad 1</Subtype>
<Attack>3</Attack>
<Defense>2</Defense>
<Gems>B1</Gems>
<Rules/>
<Flavor>Fire toads have the uncanny ability to cook their food while chewing. 1</Flavor>
<Rarity>Common 1</Rarity>
<Series>1</Series>
<Number>106</Number>
<Illustrator>Kevin Shoemaker 1</Illustrator>
</row>
<row>
<name>Fire Toad 2</name>
<id>7366070c-c74d-4bb9-b3d8-23177e887073</id>
<Sphere>Nature 2</Sphere>
<Cost>1</Cost>
<Type>Creature 2</Type>
<Subtype>Animal Toad 2</Subtype>
<Attack>3</Attack>
<Defense>2</Defense>
<Gems>B2</Gems>
<Rules/>
<Flavor>Fire toads have the uncanny ability to cook their food while chewing. 2</Flavor>
<Rarity>Common 2</Rarity>
<Series>1</Series>
<Number>106</Number>
<Illustrator>Kevin Shoemaker 2</Illustrator>
</row>
<row>
<name>Fire Toad 3</name>
<id>7366070c-c74d-4bb9-b3d8-23177e887073</id>
<Sphere>Nature 3</Sphere>
<Cost>1</Cost>
<Type>Creature 3</Type>
<Subtype>Animal Toad 3</Subtype>
<Attack>3</Attack>
<Defense>2</Defense>
<Gems>B3</Gems>
<Rules/>
<Flavor>Fire toads have the uncanny ability to cook their food while chewing. 3</Flavor>
<Rarity>Common 3</Rarity>
<Series>1</Series>
<Number>106</Number>
<Illustrator>Kevin Shoemaker 3</Illustrator>
</row>
</data>

关于MySQL:从格式异常的 XML 文件中提取数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47612956/

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