Rowversion
Here in this article I am trying to discuss related to rowversion.
Rowversion is generally used as mechanism for version-stamping table row. It automatically generates 8 bytes unique binary numbers. The rowversion data type is an incrementing numbers and not preserves any date and time on it.
Each database has a counter that is incremented for each insert or update operation that is performed on a table that contains a rowversion column within the database.
A table can have only one rowversion columns. Every time the rowversion columns increments the value if any kind on Insert or Update operation occurs. Please never use the rowversion data type as a primary key as it change the state every time when an insert or update occurs.
Timestamp is the synonym for the rowversion data type.
CREATE TABLE test_tab
(Roll INT NOT NULL PRIMARY KEY,
SName VARCHAR(50) NULL,
Ver_Stamp ROWVERSION)
GO
INSERT INTO test_tab
(Roll, SName)
VALUES (1, 'Raja Ram'),(2, 'Bijay Anand'),(3, 'Jobe Clone')
GO
SELECT Roll, SName, Ver_Stamp FROM test_tab
/* -- Output--
Roll SName Ver_Stamp
1 Raja Ram 0x0000000000014C09
2 Bijay Anand 0x0000000000014C0A <---
3 Jobe Clone 0x0000000000014C0B
*/
UPDATE test_tab
SET SName='Tony Hillary'
WHERE Roll=2
SELECT Roll, SName, Ver_Stamp FROM test_tab
/* -- Output--
Roll SName Ver_Stamp
1 Raja Ram 0x0000000000014C09
2 Tony Hillary 0x0000000000014C0C <---
3 Jobe Clone 0x0000000000014C0B
*/
Look here in this example the marked area (ß) showing the changing of versions.
Hope the article is informative and thanking you to prove your valuable time on it.
