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Increase and decrease row value by 1 in MySQL with Stored Procedure?
Let us first create a table to increase and adecrease row value by 1. The following is the query −
mysql> create table IncrementAndDecrementValue −> ( −> UserId int, −> UserScores int −> ); Query OK, 0 rows affected (0.60 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into IncrementAndDecrementValue values(101,20000); Query OK, 1 row affected (0.13 sec) mysql> insert into IncrementAndDecrementValue values(102,30000); Query OK, 1 row affected (0.20 sec) mysql> insert into IncrementAndDecrementValue values(103,40000); Query OK, 1 row affected (0.11 sec)
Display all records from the table using select statement. The query is as follows −
mysql> select *from IncrementAndDecrementValue;
The following is the output −
+--------+------------+ | UserId | UserScores | +--------+------------+ | 101 | 20000 | | 102 | 30000 | | 103 | 40000 | +--------+------------+ 3 rows in set (0.00 sec)
Here is my stored procedure to increase and decrease row value by 1.
mysql> delimiter // mysql> create procedure IncrementAndDecrementRowValueByOne() −> begin −> declare first int; −> declare second int; −> set first = (select UserScores from IncrementAndDecrementValue where UserId = 101); −> set second = (select UserScores from IncrementAndDecrementValue where UserId = 102); −> update IncrementAndDecrementValue set UserScores = first-1 where UserId = 101; −> update IncrementAndDecrementValue set UserScores = second+1 where UserId = 102; −> end // Query OK, 0 rows affected (0.17 sec) mysql> delimiter ;
Call the stored procedure using CALL command. The query is as follows −
mysql> call IncrementAndDecrementRowValueByOne(); Query OK, 1 row affected (0.24 sec)
Check the row value is updated or not using select statement. The query is as follows −
mysql> select *from IncrementAndDecrementValue;
The following is the output −
+--------+------------+ | UserId | UserScores | +--------+------------+ | 101 | 19999 | | 102 | 30001 | | 103 | 40000 | +--------+------------+ 3 rows in set (0.00 sec)
We have decremented the value 20000 to 19999 and incremented 30000 to 30001.
Updated on: 30-Jul-2019
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