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Validate Date in MySQL using a custom function
Let us create a custom function to validate date in MySQL −
mysql> set global log_bin_trust_function_creators=1; Query OK, 0 rows affected (0.03 sec) mysql> delimiter // mysql> create function isValidDate(actualDate varchar(255)) returns int -> begin -> declare flag int; -> if (select length(date(actualDate)) IS NOT NULL ) then -> set flag = 1; -> else -> set flag = 0; -> end if; -> return flag; -> end -> // Query OK, 0 rows affected (0.11 sec) mysql> delimiter ;
Case 1 −
When parameter is null value i.e. the date to be checked isn’t an actual date. Call the function using SELECT statement −
mysql> select isValidDate(NULL);
This will produce the following output i.e. not a date −
+-------------------+ | isValidDate(NULL) | +-------------------+ | 0 | +-------------------+ 1 row in set (0.05 sec)
Case 2 −
When parameter is an actual date value. Call the function using SELECT statement −
mysql> select isValidDate('2019-10-21');This will produce the following output i.e. 1, an actual date −
+---------------------------+
| isValidDate('2019-10-21') |
+---------------------------+
| 1 |
+---------------------------+
1 row in set (0.00 sec)
Updated on: 07-Apr-2020
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