How to limit number of rows can be store in mysql table?

Question

I need to limit the number of rows can be insert in a MySQL Table to 10 only. I need to implement this from MySQL only i.e without using any programming lan

Answer 1

Here's one idea...:

CREATE TABLE my_table
(id int auto_increment PRIMARY KEY  
,val char(1) NOT NULL
);

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 1 row affected (0.02 sec)

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 1 row affected (0.02 sec)

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 1 row affected (0.02 sec)

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 1 row affected (0.02 sec)

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 1 row affected (0.02 sec)

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 0 rows affected (0.00 sec)
Records: 0  Duplicates: 0  Warnings: 0

INSERT INTO my_table (val) SELECT 'b' FROM (SELECT 1) x WHERE (SELECT COUNT(*) FROM my_table) < 5;
Query OK, 0 rows affected (0.00 sec)

SELECT * FROM my_table;
+----+-----+
| id | val |
+----+-----+
|  1 | b   |
|  2 | b   |
|  3 | b   |
|  4 | b   |
|  5 | b   |
+----+-----+