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MySQL client donnees hexa string

string-functions::char

If CHAR() is invoked from within the mysql client, binary strings display using hexadecimal notation, depending on the value of the --binary-as-hex.

mysql-command-options::option_mysql_binary-as-hex

--binary-as-hex (Display binary values in hexadecimal notation)

To disable hexadecimal notation, use --skip-binary-as-hex

When this option is given, mysql displays binary data using hexadecimal notation (0xvalue). This occurs whether the overall output display format is tabular, vertical, HTML, or XML.

describe mysql.general_log;
+--------------+-----------------+------+-----+----------------------+--------------------------------------------------+
| Field        | Type            | Null | Key | Default              | Extra                                            |
+--------------+-----------------+------+-----+----------------------+--------------------------------------------------+
| event_time   | timestamp(6)    | NO   |     | CURRENT_TIMESTAMP(6) | DEFAULT_GENERATED on update CURRENT_TIMESTAMP(6) |
| user_host    | mediumtext      | NO   |     | NULL                 |                                                  |
| thread_id    | bigint unsigned | NO   |     | NULL                 |                                                  |
| server_id    | int unsigned    | NO   |     | NULL                 |                                                  |
| command_type | varchar(64)     | NO   |     | NULL                 |                                                  |
| argument     | mediumblob      | NO   |     | NULL                 |                                                  |
+--------------+-----------------+------+-----+----------------------+--------------------------------------------------+

Pour voir si l'option "binary-as-hex" est activée, on peut utiliser la commande "status" ou "\s" :

Si c'est activé (par défaut depuis MySQL 8.0.19), on voit la ligne : "Binary data as: Hexadecimal"

mysql

> \s
--------------
mysql  Ver 8.0.28 for Win64 on x86_64 (MySQL Community Server - GPL)

Connection id:          19037
Current database:       xxx
Current user:           user_xxx@192.168.1.1
SSL:                    Cipher in use is ECDHE-RSA-AES128-GCM-SHA256
Using delimiter:        ;
Server version:         8.0.25 MySQL Community Server - GPL
Protocol version:       10
Connection:             192.168.1.1 via TCP/IP
Server characterset:    utf8mb3
Db     characterset:    latin1
Client characterset:    cp850
Conn.  characterset:    cp850
TCP port:               3306
Binary data as:         Hexadecimal
Uptime:                 18 hours 24 min 20 sec

Threads: 8  Questions: 313771  Slow queries: 0  Opens: 2586  Flush tables: 3  Open tables: 1645  Queries per second avg: 4.735
--------------

SELECT argument FROM mysql.general_log;
+--------------------------------------------------------------------------------------------------------------------+
| argument                                                                                                           |
+--------------------------------------------------------------------------------------------------------------------+
| 0x53454C45435420706173732046524F4D207574696C69736174657572205748455245207574696C69736174657572203D2027636872697327 |
+--------------------------------------------------------------------------------------------------------------------+

mysql --skip-binary-as-hex

> \s
--------------
mysql  Ver 8.0.28 for Win64 on x86_64 (MySQL Community Server - GPL)

Connection id:          9693
Current database:       xxx
Current user:           user_xxx@192.168.1.1
SSL:                    Cipher in use is ECDHE-RSA-AES128-GCM-SHA256
Using delimiter:        ;
Server version:         8.0.25 MySQL Community Server - GPL
Protocol version:       10
Connection:             192.168.1.1 via TCP/IP
Server characterset:    utf8mb3
Db     characterset:    latin1
Client characterset:    cp850
Conn.  characterset:    cp850
TCP port:               3306
Uptime:                 9 hours 33 min 10 sec

Threads: 6  Questions: 146336  Slow queries: 0  Opens: 453  Flush tables: 3  Open tables: 372  Queries per second avg: 4.255
--------------

SELECT argument FROM mysql.general_log;
+----------------------------------------------------------+
| argument                                                 |
+----------------------------------------------------------+
| SELECT pass FROM utilisateur WHERE utilisateur = 'chris' |
+----------------------------------------------------------+

Alternativement on peut utiliser CAST/CONVERT sans l'option "--skip-binary-as-hex"

SELECT CONVERT(argument USING utf8) FROM mysql.general_log;
+----------------------------------------------------------+
| CONVERT(argument USING utf8)                             |
+----------------------------------------------------------+
| SELECT pass FROM utilisateur WHERE utilisateur = 'chris' |
+----------------------------------------------------------+

MySQL CLI Client shows data as Hex