MySQL8 FROM_BASE64() Functions – String Functions

MySQL FROM_BASE64() Functions: Syntax

MySQL FROM_BASE64() Functions: Description

FROM_BASE64() functions decode a string encoded with the base-64 encoding rules used by TO_BASE64() and return the decoded result as a binary string.

We can decode the TO_BASE64 strings with FROM_BASE64() function.

Below are the details about the encoding and decoding rules. There are many base-64 encoding schemes. Below rules are used by TO_BASE64() and FROM_BASE64() for encoding and decoding:

• The encoding for alphabet value 62 is ‘+’.
• The encoding for alphabet value 63 is ‘/’.
• The encoded output consists of groups of 4 printable characters. Each 3 bytes of the input data are encoded using 4 characters. If the last group is incomplete, it is padded with ‘=’ characters to a length of 4.
• A newline is added after each 76 characters of encoded output to divide long output into multiple lines. See example 3.
• Decoding recognizes and ignores newline, carriage return, tab, and space.

MySQL FROM_BASE64() Functions: Parameter

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Name, Required /Optional, Description
string, Required, The input string is string encoded with the base-64 encoded rules used by TO_BASE64() .
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MySQL FROM_BASE64() Functions: Output

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Returns,
NULL, if the argument is NULL or not a valid base-64 string. See Example 1 and 2.
Binary string, returns the decoded result as a binary string.
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MySQL FROM_BASE64() Functions: Available from

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Version, MySQL 5.0
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MySQL FROM_BASE64() Functions: Example 1

mysql> SELECT FROM_BASE64(NULL);
+-----------------+
| TO_BASE64(NULL) |
+-----------------+
| NULL            |
+-----------------+
1 row in set (0.03 sec)

MySQL FROM_BASE64() Functions: Example 2

mysql> SELECT FROM_BASE64('x0fnjjf');
+------------------------+
| FROM_BASE64('x0fnjjf') |
+------------------------+
| NULL                   |
+------------------------+
1 row in set (0.00 sec)

MySQL FROM_BASE64() Functions: Example 3

mysql> SELECT TO_BASE64('tutorialmines'), FROM_BASE64(TO_BASE64('tutorialmines'));
+----------------------------+-----------------------------------------+
| TO_BASE64('tutorialmines') | FROM_BASE64(TO_BASE64('tutorialmines')) |
+----------------------------+-----------------------------------------+
| dHV0b3JpYWxtaW5lcw==       | tutorialmines                           |
+----------------------------+-----------------------------------------+
1 row in set (0.00 sec)

See all MySQL String functions MySQL 8 String Functions.

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