How can we use nested transactions in MySQL?

MySQLMySQLi Database

We can work with nested transactions in MySQL with the help of SAVEPOINT.

Firstly, create a table. After that, begin the transaction.

Now, insert records in the table created above. Use SAVEPOINT statement to set a named transaction savepoint with a name of identifier.

Here are all the steps shown in the form of query −

Create table

mysql> create table NestedTransactionDemo
   -> (
   -> Name varchar(200)
   -> );
Query OK, 0 rows affected (0.63 sec)

Start the transaction −

mysql> START TRANSACTION;
Query OK, 0 rows affected (0.00 sec)

Now, insert a record in the table

mysql> insert into NestedTransactionDemo values('John');
Query OK, 1 row affected (0.04 sec)

Display the record added above −

mysql> select *from NestedTransactionDemo;
+------+
| Name |
+------+
| John |
+------+
1 row in set (0.00 sec)

Let us begin with working on transactions to create nested transactions −

mysql> savepoint transaction2;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into NestedTransactionDemo values('David');
Query OK, 1 row affected (0.00 sec)
mysql> select *from NestedTransactionDemo;
+-------+
| Name  |
+-------+
| John  |
| David |
+-------+
2 rows in set (0.00 sec)

mysql> rollback to transaction2;
Query OK, 0 rows affected (0.00 sec)

mysql> select *from NestedTransactionDemo;
+------+
| Name |
+------+
| John |
+------+
1 row in set (0.00 sec)

mysql> rollback to transaction2;
Query OK, 0 rows affected (0.00 sec)
raja
Published on 21-Dec-2018 08:24:58
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