SQLPlus AUTO_INCREMENT错误

Question

当我尝试在SQLPlus中运行以下命令时:

CREATE TABLE Hotel
(hotelNo NUMBER(4) NOT NULL AUTO_INCREMENT,
hotelName VARCHAR(20) NOT NULL,
city VARCHAR(50) NOT NULL,
CONSTRAINT hotelNo_pk PRIMARY KEY (hotelNo));

我收到以下错误:

(hotelNo NUMBER(4) NOT NULL AUTO_INCREMENT,
                        *
ERROR at line 2:
ORA-00907: missing right parenthesis

我究竟做错了什么？

Answer 1

许多人会抱怨这不是Oracle中的标准功能,但是当它在您的CREATE TABLE命令之后就像另外两个命令一样简单时,我看不出有任何理由在每个插入上使用花哨的SQL.首先让我们创建一个简单的表格来玩.

SQL> CREATE TABLE test
(id NUMBER PRIMARY KEY,
name VARCHAR2(30));
Table created.

现在我们假设我们希望ID成为自动增量字段.首先,我们需要一个序列来从中获取值.

SQL> CREATE SEQUENCE test_sequence
START WITH 1
INCREMENT BY 1;
Sequence created.

现在我们可以在表上的BEFORE INSERT触发器中使用该序列.

CREATE OR REPLACE TRIGGER test_trigger
BEFORE INSERT
ON test
REFERENCING NEW AS NEW
FOR EACH ROW
BEGIN
SELECT test_sequence.nextval INTO :NEW.ID FROM dual;
END;
/


SQL> INSERT INTO test (name) VALUES ('Jon');
1 row created.

SQL> INSERT INTO test (name) VALUES (’Bork’);
1 row created.

SQL> INSERT INTO test (name) VALUES (’Matt’);
1 row created.

SQL> SELECT * FROM test;

ID NAME
———- ——————————
1 Jon
2 Bork
3 Matt