Reserving MySQL auto-incremented IDs?

To reserve MySQL auto-incremented IDs, the syntax is as follows −

START TRANSACTION;
insert into yourTableName values(),(),(),();
ROLLBACK;
SELECT LAST_INSERT_ID() INTO @anyVariableName;

To understand the above syntax, let us create a table. The query to create a table is as follows −

mysql> create table reservingAutoIncrementDemo
   -> (
   -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY
   -> );
Query OK, 0 rows affected (0.45 sec)

Insert some records in the table using insert command. The query is as follows −

mysql> START TRANSACTION;
Query OK, 0 rows affected (0.00 sec)
mysql> insert into reservingAutoIncrementDemo values(),(),(),();
Query OK, 4 rows affected (0.15 sec)
Records: 4 Duplicates: 0 Warnings: 0
mysql> select *from reservingAutoIncrementDemo;
+--------+
| UserId |
+--------+
| 1      |
| 2      |
| 3      |
| 4      |
+--------+
4 rows in set (0.00 sec)
mysql> rollback;
Query OK, 0 rows affected (0.00 sec)

Here is the query to reserve the MySQL auto_incremented IDs −

mysql> SELECT LAST_INSERT_ID() INTO @IncrementedValue;
Query OK, 1 row affected (0.00 sec)

Let us check the reserved auto_incremented value. The query is as follows −

mysql> select @IncrementedValue;

Here is the output −

+-------------------+
| @IncrementedValue |
+-------------------+
| 1                 |
+-------------------+
1 row in set (0.00 sec)

Samual Sam

Learning faster. Every day.

Updated on: 30-Jul-2019

188 Views

Kickstart Your Career

Get certified by completing the course

Get Started