Java代碼

1. CREATE TABLE Movie(   
2. id           INT NOT NULL AUTO_INCREMENT,   
3. name     VARCHAR(60) NOT NULL,   
4. released YEAR NOT NULL,   
5. PRIMARY KEY (id)   
6. ) ENGINE=InnoDB;  

CREATE TABLE Movie(
id           INT NOT NULL AUTO_INCREMENT,
name     VARCHAR(60) NOT NULL,
released YEAR NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB;

Java代碼

1. INSERT INTO Movie (name,released) VALUES ('Gladiator',2000);   
2. INSERT INTO Movie (id,name,released) VALUES (NULL,'The Bourne Identity',1998);  

INSERT INTO Movie (name,released) VALUES ('Gladiator',2000);
INSERT INTO Movie (id,name,released) VALUES (NULL,'The Bourne Identity',1998);

Java代碼

1. CREATE TABLE Movie(   
2. id          INT NOT NULL,   
3. name     VARCHAR2(60) NOT NULL,   
4. released INT NOT NULL,   
5. PRIMARY KEY (id)   
6. );   
7. CREATE SEQUENCE MovieSeq;  

CREATE TABLE Movie(
id          INT NOT NULL,
name     VARCHAR2(60) NOT NULL,
released INT NOT NULL,
PRIMARY KEY (id)
);
CREATE SEQUENCE MovieSeq;

Java代碼

1. INSERT INTO Movie (id,name,released) VALUES (MovieSeq.NEXTVAL,'Gladiator',2000);  

INSERT INTO Movie (id,name,released) VALUES (MovieSeq.NEXTVAL,'Gladiator',2000);

Java代碼

1. CREATE OR REPLACE TRIGGER BRI_MOVIE_TRG   
2. BEFORE INSERT ON Movie   
3. FOR EACH ROW   
4. BEGIN   
5.   SELECT MovieSeq.NEXTVAL INTO :new.id FROM DUAL;   
6. END BRI_MOVIE_TRG;   
7. .   
8. RUN;  

CREATE OR REPLACE TRIGGER BRI_MOVIE_TRG
BEFORE INSERT ON Movie
FOR EACH ROW
BEGIN
SELECT MovieSeq.NEXTVAL INTO :new.id FROM DUAL;
END BRI_MOVIE_TRG;
.
RUN;

Java代碼

1. INSERT INTO Movie (name,released) VALUES ('The Lion King',1994);  

INSERT INTO Movie (name,released) VALUES ('The Lion King',1994);

NEXTVAL(’sequence’);
CURRVAL(’sequence’);
SETVAL(’sequence’,value);

Java代碼

1. DROP TABLE IF EXISTS sequence;   
2. CREATE TABLE sequence (   
3. name              VARCHAR(50) NOT NULL,   
4. current_value INT NOT NULL,   
5. increment       INT NOT NULL DEFAULT 1,   
6. PRIMARY KEY (name)   
7. ) ENGINE=InnoDB;   
8. INSERT INTO sequence VALUES ('MovieSeq',3,5);   
9. DROP FUNCTION IF EXISTS currval;   
10. DELIMITER $   
11. CREATE FUNCTION currval (seq_name VARCHAR(50))   
12. RETURNS INTEGER   
13. CONTAINS SQL   
14. BEGIN   
15.   DECLARE value INTEGER;   
16.   SET value = 0;   
17.   SELECT current_value INTO value   
18.   FROM sequence   
19.   WHERE name = seq_name;   
20.   RETURN value;   
21. END$   
22. DELIMITER ;  

DROP TABLE IF EXISTS sequence;
CREATE TABLE sequence (
name              VARCHAR(50) NOT NULL,
current_value INT NOT NULL,
increment       INT NOT NULL DEFAULT 1,
PRIMARY KEY (name)
) ENGINE=InnoDB;
INSERT INTO sequence VALUES ('MovieSeq',3,5);
DROP FUNCTION IF EXISTS currval;
DELIMITER $
CREATE FUNCTION currval (seq_name VARCHAR(50))
RETURNS INTEGER
CONTAINS SQL
BEGIN
DECLARE value INTEGER;
SET value = 0;
SELECT current_value INTO value
FROM sequence
WHERE name = seq_name;
RETURN value;
END$
DELIMITER ;

Java代碼

1. mysql> SELECT currval('MovieSeq');   
2. +---------------------+   
3. | currval('MovieSeq') |   
4. +---------------------+   
5. |                   3 |   
6. +---------------------+   
7. 1 row in set (0.00 sec)   
8. mysql> SELECT currval('x');   
9. +--------------+   
10. | currval('x') |   
11. +--------------+   
12. |            0 |   
13. +--------------+   
14. 1 row in set, 1 warning (0.00 sec)   
15. mysql> show warnings;   
16. +---------+------+------------------+   
17. | Level   | Code | Message          |   
18. +---------+------+------------------+   
19. | Warning | 1329 | No data to FETCH |   
20. +---------+------+------------------+   
21. 1 row in set (0.00 sec)  

mysql> SELECT currval('MovieSeq');
+---------------------+
| currval('MovieSeq') |
+---------------------+
|                   3 |
+---------------------+
1 row in set (0.00 sec)
mysql> SELECT currval('x');
+--------------+
| currval('x') |
+--------------+
|            0 |
+--------------+
1 row in set, 1 warning (0.00 sec)
mysql> show warnings;
+---------+------+------------------+
| Level   | Code | Message          |
+---------+------+------------------+
| Warning | 1329 | No data to FETCH |
+---------+------+------------------+
1 row in set (0.00 sec)

Java代碼

1. DROP FUNCTION IF EXISTS nextval;   
2. DELIMITER $   
3. CREATE FUNCTION nextval (seq_name VARCHAR(50))   
4. RETURNS INTEGER   
5. CONTAINS SQL   
6. BEGIN   
7.    UPDATE sequence   
8.    SET          current_value = current_value + increment   
9.    WHERE name = seq_name;   
10.    RETURN currval(seq_name);   
11. END$   
12. DELIMITER ;  

DROP FUNCTION IF EXISTS nextval;
DELIMITER $
CREATE FUNCTION nextval (seq_name VARCHAR(50))
RETURNS INTEGER
CONTAINS SQL
BEGIN
UPDATE sequence
SET          current_value = current_value + increment
WHERE name = seq_name;
RETURN currval(seq_name);
END$
DELIMITER ;

Java代碼

1. mysql> select nextval('MovieSeq');   
2. +---------------------+   
3. | nextval('MovieSeq') |   
4. +---------------------+   
5. |                  15 |   
6. +---------------------+   
7. 1 row in set (0.09 sec)   
8.   
9. mysql> select nextval('MovieSeq');   
10. +---------------------+   
11. | nextval('MovieSeq') |   
12. +---------------------+   
13. |                  20 |   
14. +---------------------+   
15. 1 row in set (0.01 sec)   
16.   
17. mysql> select nextval('MovieSeq');   
18. +---------------------+   
19. | nextval('MovieSeq') |   
20. +---------------------+   
21. |                  25 |   
22. +---------------------+   
23. 1 row in set (0.00 sec)  

mysql> select nextval('MovieSeq');
+---------------------+
| nextval('MovieSeq') |
+---------------------+
|                  15 |
+---------------------+
1 row in set (0.09 sec)
mysql> select nextval('MovieSeq');
+---------------------+
| nextval('MovieSeq') |
+---------------------+
|                  20 |
+---------------------+
1 row in set (0.01 sec)
mysql> select nextval('MovieSeq');
+---------------------+
| nextval('MovieSeq') |
+---------------------+
|                  25 |
+---------------------+
1 row in set (0.00 sec)

Java代碼

1. DROP FUNCTION IF EXISTS setval;   
2. DELIMITER $   
3. CREATE FUNCTION setval (seq_name VARCHAR(50), value INTEGER)   
4. RETURNS INTEGER   
5. CONTAINS SQL   
6. BEGIN   
7.    UPDATE sequence   
8.    SET          current_value = value   
9.    WHERE name = seq_name;   
10.    RETURN currval(seq_name);   
11. END$   
12. DELIMITER ;  

DROP FUNCTION IF EXISTS setval;
DELIMITER $
CREATE FUNCTION setval (seq_name VARCHAR(50), value INTEGER)
RETURNS INTEGER
CONTAINS SQL
BEGIN
UPDATE sequence
SET          current_value = value
WHERE name = seq_name;
RETURN currval(seq_name);
END$
DELIMITER ;

Java代碼

1. mysql> select setval('MovieSeq',150);   
2. +------------------------+   
3. | setval('MovieSeq',150) |   
4. +------------------------+   
5. |                    150 |   
6. +------------------------+   
7. 1 row in set (0.06 sec)   
8.   
9. mysql> select curval('MovieSeq');   
10. +---------------------+   
11. | currval('MovieSeq') |   
12. +---------------------+   
13. |                 150 |   
14. +---------------------+   
15. 1 row in set (0.00 sec)   
16.   
17. mysql> select nextval('MovieSeq');   
18. +---------------------+   
19. | nextval('MovieSeq') |   
20. +---------------------+   
21. |                 155 |   
22. +---------------------+   
23. 1 row in set (0.00 sec)