Question

我试图选择一个特定的xml值作为存储为XML的Oracle 11G表中的列-巨大的CLOB，但是无法。请帮助

XML内容如下

<Bid xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/LCC.Crew.FAReserves.wsvc.Entities.FAReserves">
  <AggressiveBidType></AggressiveBidType>
  <BidCriteria>
    <BidCriteria i:type="RapBidCriteria">
      <Value xmlns:d4p1="http://www.w3.org/2001/XMLSchema" i:type="d4p1:string">BAC</Value>
    </BidCriteria>
  </BidCriteria>
  <BidItem>RAP</BidItem>
  <BidName>BAC</BidName>
  <BidType>Standing</BidType>
  <CatsId>10023</CatsId>
  <EmployeeBidId>10620</EmployeeBidId>
  <EmployeeId>135289</EmployeeId>
  <EndDate>2015-03-29T00:00:00Z</EndDate>
  <IsAggressive>false</IsAggressive>
  <IsLodo>false</IsLodo>
  <IsOnPremiseReserve>false</IsOnPremiseReserve>
  <OperatingDate>2015-02-25T00:00:00Z</OperatingDate>
  <Priority>0</Priority>
</Bid>

以下语句返回空值

SELECT extract(XMLTYPE(XMLBIDCONTENT),'/Bid/BidName/text()') "REFERENCE"
  FROM  AOCREWBIDDING.EMPLOYEEBIDS
   Where EmployeeBidID = 100

以下语句返回错误

ORA-00932：数据类型不一致：预期-得到-   00932。00000-“数据类型不一致：预期的％s得到了％s”   *原因：
  *操作：第83行的错误：第8列

SELECT extract(XMLBIDCONTENT,'/Bid/BidName/text()').getStringVal() "REFERENCE"
  FROM  AOCREWBIDDING.EMPLOYEEBIDS
   Where EmployeeBidID = 100

Answer 1

The extract() function is deprecated。最好使用XMLQuery()。

您需要声明一个默认名称空间以匹配XML文档中的名称空间：

select XMLQuery('
    declare default element namespace 
      "http://schemas.datacontract.org/2004/07/LCC.Crew.FAReserves.wsvc.Entities.FAReserves"; (: :)
    /Bid/BidName/text()'
  passing XMLType(xmlbidcontent)
  returning content) as BidName
from employeebids
where EmployeeBidID = 100;

BIDNAME                                                                         
--------------------------------------------------------------------------------
BAC

或（更简单但更不可靠）使用通配符：

select XMLQuery('/*:Bid/*:BidName/text()'
  passing XMLType(xmlbidcontent)
  returning content) as BidName
from employeebids
where EmployeeBidID = 100;

BIDNAME                                                                         
--------------------------------------------------------------------------------
BAC

db<>fiddle显示您的原始查询，并使用CTE提供样本CLOB值来显示这两个查询。

无法从Oracle CBLOB中提取XML值

1 个答案: