Understanding base64 encoding in MySQL?

To encode Base64 you can use two functions -

• TO_BASE64()
• FROM_BASE64()

The syntax for base64 encoding is as follows-

SELECT TO_BASE64(anyValue) as AnyVariableName;

The syntax for base64 decoding is as follows-

SELECT FROM_BASE64(encodeValue) as anyVariableName

To understand the above concept, let us use the above syntax-

Case 1 - Encoding

To encode a value, use to_base64(). The query is as follows -

mysql> select TO_BASE64('Password') as Base64EncodeValue;

Output

+-------------------+
| Base64EncodeValue |
+-------------------+
| UGFzc3dvcmQ=      |
+-------------------+
1 row in set (0.00 sec)

Case 2 - Decoding

To decode the value, use from_base64(). The query is as follows -

mysql> select FROM_BASE64('UGFzc3dvcmQ=') as Base64DecodeValue;

Output

+-------------------+
| Base64DecodeValue |
+-------------------+
| Password          |
+-------------------+
1 row in set (0.00 sec)

You can understand this by creating a table. The query to create the table is as follows -

mysql> create table Base64Demo
-> (
-> ProductId varchar(100)
-> );
Query OK, 0 rows affected (0.54 sec)

Use the insert command to insert some records in the table. The query is as follows -

mysql> insert into Base64Demo values('321Product');
Query OK, 1 row affected (0.16 sec)

mysql> insert into Base64Demo values('Product456');
Query OK, 1 row affected (0.14 sec)

mysql> insert into Base64Demo values('654Product');
Query OK, 1 row affected (0.15 sec)

Use the select statement to display all records in the table. The query is as follows -

mysql> select *from Base64Demo;

Output

+------------+
| ProductId  |
+------------+
| 321Product |
| Product456 |
| 654Product |
+------------+
3 rows in set (0.00 sec)

Here is the query encoded using Base64. The query is as follows -

mysql> select TO_BASE64(ProductId) as Base64Encode from Base64Demo;

Output

+------------------+
| Base64Encode     |
+------------------+
| MzIxUHJvZHVjdA== |
| UHJvZHVjdDQ1Ng== |
| NjU0UHJvZHVjdA== |
+------------------+
3 rows in set (0.00 sec)

Now let us cross check whether we get the original value after decoding the first value in the column. The query is as follows -

mysql> select FROM_BASE64('MzIxUHJvZHVjdA==') as DecodeValue;

Output

+-------------+
| DecodeValue |
+-------------+
| 321Product  |
+-------------+
1 row in set (0.00 sec)

Yes, we are getting the initial value.

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