ORA-22806: 不是对象或 REF: 生成 XML 输出时出错

Question

我正在尝试通过创建一个过程来创建一个 XML 输出文件，并将该过程用于并发请求。请找到下面的包程序代码。

并发程序出错了

“原因：FDPSTP 由于 ORA-19202 失败：XML 处理中发生错误 ORA-22806：不是对象或 REF”。

CREATE OR REPLACE PACKAGE BODY xx_outbound_xml1
AS
   PROCEDURE xx_insert_outbound_xml1 (
      errbuff   OUT   VARCHAR2,
      errcode   OUT   NUMBER
   )
   IS
      ln_ctx        DBMS_XMLGEN.ctxhandle;
      lc_xml_clob   CLOB;
   BEGIN
      ln_ctx :=
         DBMS_XMLGEN.newcontext
            (   'SELECT XMLELEMENT("litleRequest",
                              XMLATTRIBUTES('
             || 'to_char(sysdate,''DDMMYYYHH24MI:SS'')'
             || ' AS "Id"                   ),
                (SELECT 
                    XMLAGG(
                        XMLELEMENT(
                        evalname(Decode((select order_type FROM my_orders WHERE order_id = mo.order_id),''CO'',''"Credit"'',''"Sale"'')).getstringval(),
                        XMLFOREST (
                        mo.order_id AS "orderId",
                        mo.order_type as "orderType"
                                    )
                                )
                        )
  FROM my_orders mo
                )
            ) xml
 FROM dual'
            );
      DBMS_XMLGEN.setrowsettag (ln_ctx, NULL);
      DBMS_XMLGEN.setrowtag (ln_ctx, NULL);
      --DBMS_XMLGEN.setNullHandling(ln_ctx,dbms_xmlgen.EMPTY_TAG);
      lc_xml_clob := DBMS_XMLGEN.getxml (ln_ctx);
      lc_xml_clob := REPLACE (lc_xml_clob, '<XML>', '');
      lc_xml_clob := REPLACE (lc_xml_clob, '</XML>', '');
      DBMS_XSLPROCESSOR.clob2file (lc_xml_clob,
                                   'INBOUNDFOLDER',
                                   'output.xml',
                                   0
                                  );
      DBMS_LOB.freetemporary (lc_xml_clob);
   END xx_insert_outbound_xml1;
END xx_outbound_xml1;

如果订单类型是 CO，那么标签应该是 Credit，或者如果 order_type 是 SO，那么标签应该是 Sales。

我的输出应该是这样的：

Answer 1

您不需要将 DBMS_XMLGEN 与 XML 函数一起使用，因为它已经是 XML！错误还来自您尝试在非 XMLType 对象上调用 getstringval 的事实。

而只是这样做：

create or replace package body xx_outbound_xml1
as
   procedure xx_insert_outbound_xml1 (
      errbuff   out   varchar2,
      errcode   out   number
   )
   is
      ln_ctx        dbms_xmlgen.ctxhandle;
      lc_xml_clob   clob;
   begin
     select xmlserialize(document
              xmlelement(
                "litleRequest",
                xmlattributes(to_char(sysdate,'DDMMYYYHH24MI:SS')  AS "Id"),
                xmlagg(
                  xmlelement(
                    evalname(Decode(order_type, 'CO','Credit','Sale')),
                    xmlforest (
                      mo.order_id AS "orderId",
                      mo.order_type as "orderType"
                    )
                  )
                )
              )
            ) xml
     into lc_xml_clob
     from my_orders mo;

    dbms_xslprocessor.clob2file (lc_xml_clob,
                                 'INBOUNDFOLDER',
                                 'output.xml',
                                 0
                                );
   end xx_insert_outbound_xml1;
end xx_outbound_xml1;
/

例如，使用该代码（加上我在 xmlserialize 中添加了“缩进”，以便在此处更容易看到）：

SQL> var b varchar2(2000)
SQL> var c number
SQL> exec xx_outbound_xml1.xx_insert_outbound_xml1(:b, :c)

PL/SQL procedure successfully completed.

SQL> host cat /tmp/output.xml
<litleRequest Id="05030131727:20">
  <Sale>
    <orderId>1132339612</orderId>
    <orderType>SO</orderType>
  </Sale>
  <Credit>
    <orderId>1132339530</orderId>
    <orderType>CO</orderType>
  </Credit>
  <Sale>
    <orderId>1132339116</orderId>
    <orderType>SO</orderType>
  </Sale>
  <Credit>
    <orderId>1132338886</orderId>
    <orderType>CO</orderType>
  </Credit>
</litleRequest>

SQL> select * from my_orders;

  ORDER_ID OR
---------- --
1132339612 SO
1132339530 CO
1132339116 SO
1132338886 CO

SQL>