March 2012
Intermediate to advanced
442 pages
9h 31m
English
Content preview from IBM DB2 9.7 Advanced Application Developer CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Referencing a sequence object
The sequence objects create values that get incremented under the application control. We can use NEXT VALUE and PREVIOUS VALUE commands to use sequence values. Alternatively, we can also use NEXTVAL and CURRVAL instead of NEXT VALUE and PREVIOUS VALUE respectively. These alternatives are only for compatibility with the previous versions of DB2 and are not recommended to be used.
Getting ready
We need the USAGE privilege on a sequence object to use the sequence. The creator of the sequence object automatically gets USAGE and ALTER privileges.
How to do it...
- We can use the
NEXT VALUEcommand to get the next value generated by the sequence object:
VALUES NEXT VALUE FOR item_num;
VALUES item_num NEXTVAL;
- We can also use ...
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