繼承與Oracle對象

Question

我嘗試實現繼承與Oracle對象：

CREATE OR REPLACE TYPE ENREG_320_BASE AS OBJECT (.....) NOT FINAL 
CREATE OR REPLACE TYPE ENREG_320_03 AS OBJECT UNDER ENREG_320_BASE(.....) FINAL 

我有一個錯誤：

Error: ORA-06550: line 1, column 29: PLS-00103: Encountered the symbol "UNDER" when expecting one of the following:

(not external JAVA_ BOUND_ The symbol "(" was substituted for "UNDER" to continue. ORA-06550: line 2, column 17: PLS-00103: Encountered the symbol "VARCHAR2" when expecting one of the following:

. () , * @ % & | = - + </> at in is mod remainder not range rem => .. <> or != or ~= >= <= <> and or like LIKE2_ LIKE4_ LIKE ORA-06550: line 3, column 27: PLS-00103: Encountered the symbol "VARCHAR2" when expecting one of the following:

有可能是我做的事情錯了（第一次嘗試在PLSQL繼承） 。你能幫我嗎 ？

PS：我用的是Oracle 10

工作謝謝

Answer 1

創建子類型時，我們不需要爲研究對象。它由UNDER關鍵字暗示。

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