USQL - 如何使用 xml 提取器从 xml 文件中提取属性值 [英] USQL - How to extract the attribute value from xml file using xml extractor

问题描述

如何使用自定义提取器使用 U-SQL 作业从 XML 文件中提取属性值.我可以从 XML 文件中提取子元素值.

示例 Xml 文件:<?xml version="1.0" encoding="UTF-8"?><用户><用户 ID="001"><名字>大卫</名字><LastName>bacham</LastName></用户><用户 ID="002"><FirstName>xyz</FirstName><LastName>abc</LastName></用户></用户>

我可以使用以下代码提取名字和姓氏.如何将 ID 值作为 csv 文件的一部分获取.

示例 U sql 作业:

参考汇编 [Microsoft.Analytics.Samples.Formats];@input = 提取名字字符串，姓氏字符串来自@"/USERS.xml"使用新的 Microsoft.Analytics.Samples.Formats.Xml.XmlExtractor("User",new SQL.MAP{{"名字","名字"},{"姓氏","姓氏"});@output = SELECT * FROM @input;输出@输出到/USERS.csv"使用 Outputters.Csv();

解决方案

您可以在 Databricks 中轻松完成此操作，例如

%sql创建表用户使用 com.databricks.spark.xml选项(路径/FileStore/tables/input42.xml"，rowTag用户")

然后阅读表格:

%sql选择 *来自用户；

如果您必须使用 U-SQL 执行此操作，请使用

How to extract the attribute value from XML file using custom extractor using U-SQL job. I can able to extract the sub element values from XML file.

sample Xml File:
<?xml version="1.0" encoding="UTF-8"?>
<Users>
<User ID="001">
    <FirstName>david</FirstName>
    <LastName>bacham</LastName>
</User>
<User ID="002">
  <FirstName>xyz</FirstName>
  <LastName>abc</LastName>
</User>
</Users>

I can able to extract Firstname and lastname using the below code.How can i get ID value as a part of csv file.

Sample U sql Job:

REFERENCE ASSEMBLY [Microsoft.Analytics.Samples.Formats];
@input = EXTRACT 
  FirstName string,
  LastName string 
  FROM @"/USERS.xml"
  USING new Microsoft.Analytics.Samples.Formats.Xml.XmlExtractor("User",
    new SQL.MAP<string, string> { 
    {"FirstName","FirstName"},
    {"LastName","LastName"}
 );

 @output = SELECT * FROM @input;

 OUTPUT @output
 TO "/USERS.csv"
 USING Outputters.Csv();

解决方案

You can do this easily in Databricks, eg

%sql
CREATE TABLE User
USING com.databricks.spark.xml
OPTIONS (path "/FileStore/tables/input42.xml", rowTag "User")

Then read the table:

%sql
SELECT *
FROM User;

If you must do it with U-SQL then using the XmlDomExtractor from the Formats assembly worked for me:

REFERENCE ASSEMBLY [Microsoft.Analytics.Samples.Formats];

DECLARE @inputFile string = "/input/input40.xml";

@input =
    EXTRACT 
        id string,
        firstName string,
        lastName string
    FROM @inputFile
    USING new Microsoft.Analytics.Samples.Formats.Xml.XmlDomExtractor(rowPath : "/Users/User",
          columnPaths : new SQL.MAP<string, string>{
          { "@ID", "id" },
          { "FirstName", "firstName" },
          { "LastName", "lastName" }
          }
          );


@output =
    SELECT *
    FROM @input;


OUTPUT @output
TO "/output/output.csv"
USING Outputters.Csv();

My results:

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