Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How can we use nested transactions allowed in MySQL?
We can allow multiple transactions with the help of START command and SAVEPOINT. Let us create a table with the help of CREATE command.
Creating a table
mysql> CREATE table transactionDemo -> ( -> id int auto_increment, -> primary key(id) -> ); Query OK, 0 rows affected (0.76 sec)
After that, I will begin a transaction with the help of START command −
mysql> START TRANSACTION; Query OK, 0 rows affected (0.00 sec)
After that, I am inserting the following record with the help of INSERT command −
mysql> INSERT into transactionDemo values(); Query OK, 1 row affected (0.04 sec)
We can display a record with the help of SELECT statement, which is as follows −
mysql> SELECT *from transactionDemo;
The following is the output
+----+ | id | +----+ | 1 | +----+ 1 row in set (0.00 sec)
After that, I am saving this query with the help of SAVEPOINT. The query is as follows −
mysql> SAVEPOINT t2;
Insert record
mysql> INSERT into transactionDemo values(); Query OK, 1 row affected (0.00 sec)
Display all the records with the help of SELECT command −
mysql> SELECT *from transactionDemo;
The following is the output
+----+ | id | +----+ | 1 | | 2 | +----+ 2 rows in set (0.00 sec)
Now, we can rollback the first transaction −
mysql> ROLLBACK TO t2; Query OK, 0 rows affected (0.03 sec)
Now, we can display the transaction saved previously −
mysql> SELECT * from transactionDemo;
The following is the output
+----+ | id | +----+ | 1 | +----+ 1 row in set (0.00 sec)
Updated on: 25-Jun-2020
237 Views
Advertisements