如何在 oracle 的 xmltype 列中添加和删除现有数据的 xml 标签

Question

我创建了下表：

这是 1 个数据行示例：

在该表中，SALPROFILE 列中，每列数据包含一个大的 xml 数据，如下示例：

<employee>
  <id>FMCSC00015</id>
  <year>2016</year>
  <month>1</month>
  <PAYMSTR_SALHDNM>BASIC PAY</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>35600</PAYMSTR_AMOUNT>
  <PAYMSTR_SALHDNM>ASSOCIATION SUBSCRIPTION</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>240</PAYMSTR_AMOUNT>
  <PAYMSTR_SALHDNM>TELEPHONE ALLOWANCE</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>800</PAYMSTR_AMOUNT>
  <PAYMSTR_SALHDNM>HOUSE RENT DEDUCTION</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>2587.5</PAYMSTR_AMOUNT>
  <PAYMSTR_SALHDNM>MEDICAL ALLOWANCE</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>700</PAYMSTR_AMOUNT>
  <PAYMSTR_SALHDNM>GAS BILL</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>450</PAYMSTR_AMOUNT>  
  <PAYMSTR_SALHDNM>LIFE INSURANCE PREMIUM (D)</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>1718</PAYMSTR_AMOUNT>  
</employee>

我想从上面的示例中添加和删除 xml 标签。 例如，我想删除

<PAYMSTR_SALHDNM>BASIC PAY</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>35600</PAYMSTR_AMOUNT>

我想添加

 <PAYMSTR_SALHDNM>BANK LOAN</PAYMSTR_SALHDNM>
  <PAYMSTR_AMOUNT>23490</PAYMSTR_AMOUNT>

我该怎么做。这是否可能在不跟踪整个 xml 数据的情况下做到这一点以使其更快。我看到 Appendchildxml function 已弃用

Answer 1

您可以通过AppendChildXML 和deleteXML 的方式添加/删除带有以下内容的标签来修改您的XML。

在示例中，第一部分返回您的 XML 多一个标签，而第二列删除一个与 [...] 之间的条件匹配的标签：

with xmlTab(val) as (
    select xmlType('<employee>
      <id>FMCSC00015</id>
      <year>2016</year>
      <month>1</month>
      <PAYMSTR_SALHDNM>BASIC PAY</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>35600</PAYMSTR_AMOUNT>
      <PAYMSTR_SALHDNM>ASSOCIATION SUBSCRIPTION</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>240</PAYMSTR_AMOUNT>
      <PAYMSTR_SALHDNM>TELEPHONE ALLOWANCE</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>800</PAYMSTR_AMOUNT>
      <PAYMSTR_SALHDNM>HOUSE RENT DEDUCTION</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>2587.5</PAYMSTR_AMOUNT>
      <PAYMSTR_SALHDNM>MEDICAL ALLOWANCE</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>700</PAYMSTR_AMOUNT>
      <PAYMSTR_SALHDNM>GAS BILL</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>450</PAYMSTR_AMOUNT>  
      <PAYMSTR_SALHDNM>LIFE INSURANCE PREMIUM (D)</PAYMSTR_SALHDNM>
      <PAYMSTR_AMOUNT>1718</PAYMSTR_AMOUNT>  
    </employee>')
    from dual
    )
    select APPENDCHILDXML( val,
                           'employee',
                           XMLType('<PAYMSTR_SALHDNM>SONALI BANK LOAN-4</PAYMSTR_SALHDNM>')
                         ) as APPEND,  
           DELETEXML(val,'/employee/PAYMSTR_AMOUNT[.="1718"]') AS DEL
    from xmlTab

要添加的 XML 可以通过从另一个表中读取数据来动态构建，例如以这种方式：

with test as 
(
    select 'PAYMSTR_SALHDNM' tag, 'SONALI BANK LOAN-4' val from dual union all
    select 'PAYMSTR_SALHDNM' tag, 'GAS BILL' val from dual
)     
select XMLELEMENT(tag, val) from test