在SQL Server中使用OpenXML从XML提取数据

Question

我有一个XML，希望在SQL Server中使用OpenXML将其提取

这里是示例XML

<row>
  <student_token>7</student_token>
  <student_ssn>552</student_ssn>
  <alternate_id>20</alternate_id>
  <old_ssn xsi:nil="true" />
  <alien_num xsi:nil="true" />
  <last_name>A</last_name>
  <first_name>B</first_name>
  <middle_init xsi:nil="true" />
  <drivers_license_num xsi:nil="true" />
  <gpa_highschool xsi:nil="true" />
  <created_dt>2006-07-13T11:15:08.320</created_dt>
  <created_how>4</created_how>
  <modified_dt>2008-02-14T00:00:00</modified_dt>
  <modified_by>4</modified_by>
  <primary_street2 xsi:nil="true" />
  <primary_street3 xsi:nil="true" />
  <primary_country xsi:nil="true" />
  <email_address xsi:nil="true" />
  <address_start_dt xsi:nil="true" />
  <address_end_dt xsi:nil="true" />
  <entrance_iv_dt xsi:nil="true" />
  <entrance_iv_by xsi:nil="true" />
  <exit_iv_dt>2006-11-02T00:00:00</exit_iv_dt>
  <exit_iv_by>156</exit_iv_by>
  <foreign_address_indicator>N</foreign_address_indicator>
  <foreign_postal_code xsi:nil="true" />
  <pin>J27841</pin>
  <web_id>J08614   </web_id>
  <prior_name xsi:nil="true" />
  <orig_eps xsi:nil="true" />
  <web_role>STU1</web_role>
  <heal_limit_flag>N</heal_limit_flag>
  <email_address_2>[email protected]</email_address_2>
  <cellular_telephone>415</cellular_telephone>
  <alt_loan_debt xsi:nil="true" />
  <web_last_login xsi:nil="true" />
  <foreign_country_code xsi:nil="true" />
  <entrance_iv_dt_grad_plus xsi:nil="true" />
  <entrance_iv_by_grad_plus xsi:nil="true" />
  <failed_logins>0</failed_logins>
  <hispanic xsi:nil="true" />
  <race xsi:nil="true" />
  <primary_phone_number_intl xsi:nil="true" />
  <security_version>0</security_version>
  <failed_challenge_response>0</failed_challenge_response>
  <require_pin_reset xsi:nil="true" />
</row>

查询应提取到每行3个字段中

1. FieldName
2. FieldValue
3. IsNull

例如，第一行应该是

• FieldName = student_token-节点名称将是字段名称
• FieldValue = 7
• IsNull = false-IsNull基于属性xsi：nil =“ true”

我该怎么做？任何帮助，将不胜感激。

谢谢

Answer 1

添加了名称空间的示例数据。

declare @xml xml 
set @xml = 
'<row xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <student_token>7</student_token>
  <student_ssn>552</student_ssn>
  <alternate_id>20</alternate_id>
  <old_ssn xsi:nil="true" />
  <alien_num xsi:nil="true" />
  <last_name>A</last_name>
  <first_name>B</first_name>
  <middle_init xsi:nil="true" />
  <drivers_license_num xsi:nil="true" />
  <gpa_highschool xsi:nil="true" />
  <created_dt>2006-07-13T11:15:08.320</created_dt>
  <created_how>4</created_how>
  <modified_dt>2008-02-14T00:00:00</modified_dt>
  <modified_by>4</modified_by>
  <primary_street2 xsi:nil="true" />
  <primary_street3 xsi:nil="true" />
  <primary_country xsi:nil="true" />
  <email_address xsi:nil="true" />
  <address_start_dt xsi:nil="true" />
  <address_end_dt xsi:nil="true" />
  <entrance_iv_dt xsi:nil="true" />
  <entrance_iv_by xsi:nil="true" />
  <exit_iv_dt>2006-11-02T00:00:00</exit_iv_dt>
  <exit_iv_by>156</exit_iv_by>
  <foreign_address_indicator>N</foreign_address_indicator>
  <foreign_postal_code xsi:nil="true" />
  <pin>J27841</pin>
  <web_id>J08614   </web_id>
  <prior_name xsi:nil="true" />
  <orig_eps xsi:nil="true" />
  <web_role>STU1</web_role>
  <heal_limit_flag>N</heal_limit_flag>
  <email_address_2>[email protected]</email_address_2>
  <cellular_telephone>415</cellular_telephone>
  <alt_loan_debt xsi:nil="true" />
  <web_last_login xsi:nil="true" />
  <foreign_country_code xsi:nil="true" />
  <entrance_iv_dt_grad_plus xsi:nil="true" />
  <entrance_iv_by_grad_plus xsi:nil="true" />
  <failed_logins>0</failed_logins>
  <hispanic xsi:nil="true" />
  <race xsi:nil="true" />
  <primary_phone_number_intl xsi:nil="true" />
  <security_version>0</security_version>
  <failed_challenge_response>0</failed_challenge_response>
  <require_pin_reset xsi:nil="true" />
</row>'

Answer 2

不确定是否将XML作为SQL变量或放在表中-问题非常不清楚.....

Answer 3

您可以将xml文件转换为json，然后使用OPENJSON。看看openjson : SELECT star如何使用OPENJSON而不用列出列名。

要将xml文件转换为json，可以使用sp_execute_external_script和xmltodict python模块。看看Importing Python Libraries to SQL Server导入python模块并处理YAPI（还需要另一个Python安装）问题。