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How to mask data fields in MySQL?
To mask data fields, use CONCAT() along with REPEAT(). Here, we will mask data fields with #. Let us first create a −
mysql> create table DemoTable1410 -> ( -> Password varchar(80) -> ); Query OK, 0 rows affected (0.51 sec)
Insert some records in the table using insert −
mysql> insert into DemoTable1410 values('John12345678');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable1410 values('Carol_897');
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable1410 values('David_5647383');
Query OK, 1 row affected (0.17 sec)Display all records from the table using select −
mysql> select * from DemoTable1410;
This will produce the following output −
+---------------+ | Password | +---------------+ | John12345678 | | Carol_897 | | David_5647383 | +---------------+ 3 rows in set (0.00 sec)
Here is the query to mask data fields in MySQL −
mysql> update DemoTable1410
-> set Password=concat(substr(Password, 1, 5), repeat('#', char_length(Password) - 5));
Query OK, 3 rows affected (0.16 sec)
Rows matched: 3 Changed: 3 Warnings: 0Let us check the table records once again −
mysql> select * from DemoTable1410;
This will produce the following output −
+---------------+ | Password | +---------------+ | John1####### | | Carol#### | | David######## | +---------------+ 3 rows in set (0.00 sec)
Updated on: 12-Nov-2019
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