PLSQL CLOBS到變量

Question

我試圖將一個CLOB保存到一個變量來執行像提取等操作。我有這樣的代碼：

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; 

我想從XML保存多個值，以各種變量像n_rec。如何獲取「對象實例（CLOB）」來執行函數或方法，如extract()？

Answer 1

您需要先將其轉換成一個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;