PLSQL CLOBS变成变量

Question

我正在尝试将a保存CLOB到变量中以执行提取等操作.我有这个代码:

DECLARE
  clob_rec CLOB;
  n_rec NUMBER:=100;
BEGIN
  SELECT LOB INTO clob_rec FROM table1 WHERE ID = 1234;
  n_rec := clob_rec.EXTRACT('//XPTO/text()', 'xmlns:XPTO').getNumVal();
END;

我想保存多个值,XML如各种变量n_rec.如何获得"对象实例(CLOB)"来执行函数或方法extract()？

Answer 1

您需要先将其转换为XMLtype:

DECLARE
  clob_rec CLOB;
  n_rec NUMBER:=100;
  x XMLType;
BEGIN
  SELECT LOB INTO clob_rec FROM table1 WHERE ID = 1234;
  x := XMLType(clob_rec);
  n_rec := x.EXTRACT('//XPTO/text()', 'xmlns:XPTO').getNumVal();
END;