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MySQL BEGIN Transaction
Posted on: December 9, 2010 at 12:00 AM
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This example illustrates how to use the BEGIN keyword in a Transaction.

MySQL BEGIN Transaction

This example illustrates how to use the BEGIN keyword in a Transaction.

In this example we create a table 'trans' with column 'id', 'item' and 'quantity'. Here in the query below we insert one row in the table. Now we execute a BEGIN command and then UPDATE the existing row. After updating the row we can ROLLBACK the data of the table as below in the table.

Query

 CREATE TABLE trans
 (
 id int not null auto_increment,
 item varchar(30) not null,
 quantity varchar(10) not null,
 primary key(id)
 )type=innodb;

Query

DESC trans;

Output

+----------+---------------+------+-----+---------+----------------+
| Field    | Type          | Null | Key | Default | Extra          |
+----------+---------------+------+-----+---------+----------------+
| id       | int(11)       | NO   | PRI |         | auto_increment |
| item     | varbinary(30) | NO   |     |         |                |
| quantity | varbinary(10) | NO   |     |         |                |
+----------+---------------+------+-----+---------+----------------+

Query

INSERT INTO trans (id,item,quantity) VALUES (NULL,'Computer','5');		

Output

+----+----------+----------+
| id | item     | quantity |
+----+----------+----------+
| 1  | Computer | 5        |
+----+----------+----------+

Query

BEGIN;

Query

UPDATE trans SET quantity ='4' WHERE id=1;

Output

+----+----------+----------+
| id | item     | quantity |
+----+----------+----------+
| 1  | Computer | 4        |
+----+----------+----------+

Query

ROLLBACK;

Output

+----+----------+----------+
| id | item     | quantity |
+----+----------+----------+
| 1  | Computer | 5        |
+----+----------+----------+

Query

COMMIT;

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Posted on: December 9, 2010

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