Oracle Sql Developer“字面量太长”错误

Question

我要在Oracle SQL Developer中针对Oracle 10g服务器运行以下SQL：

WITH openedXml AS (
  SELECT extractvalue(column_value, '/theRow/First') FIRST,
         extractvalue(column_value, '/theRow/Last') LAST,
         to_number(extractvalue(column_value, '/theRow/Age')) Age
    FROM TABLE(XMLSequence(XMLTYPE('
  <theRange>
    <theRow><First>Bob</First><Last>Smith</Last><Age>30</Age></theRow>
    <theRow><First>Sue</First><Last>Jones</Last><Age>34</Age></theRow>
...
...
...
    <theRow><First>Tom</First><Last>Anderson</Last><Age>39</Age></theRow>
    <theRow><First>Ali</First><Last>Grady</Last><Age>45</Age></theRow>
  </theRange>
  ').extract('/theRange/theRow')))
)
SELECT *
FROM openedxml
WHERE age BETWEEN 30 AND 35;

当我尝试运行它时，出现以下错误：

Error at Command Line:1 Column:0 Error report: SQL Error: ORA-01704: string literal too long
01704. 00000 -  "string literal too long"
*Cause:    The string literal is longer than 4000 characters.
*Action:   Use a string literal of at most 4000 characters.
           Longer values may only be entered using bind variables.

我的字符串有时会长于4000个字符。关于如何解决这个问题的任何想法吗？

Answer 1

您将需要使用CLOB作为XMLTYPE（）的输入，而不是VARCHAR。

使用dbms_lob.loadclobfromfile从文件中加载xml，或通过将xml分成32000个字符块并附加到CLOB的方式。

DECLARE
   xmlClob CLOB;
BEGIN
/* Build Clob here */

WITH openedXml AS (
  SELECT extractvalue(column_value, '/theRow/First') FIRST,
         extractvalue(column_value, '/theRow/Last') LAST,
         to_number(extractvalue(column_value, '/theRow/Age')) Age
    FROM TABLE(XMLSequence(XMLTYPE(xmlClob).extract('/theRange/theRow')))
)
SELECT *
FROM openedxml
WHERE age BETWEEN 30 AND 35;
END;