1. About the PASSWORD function
Description:
The PASSWORD(str) function is used to modify the MySQL user password. For applications and WEB programs, it is recommended to use the MD5() function.
This function was removed after MySQL 8.x, and MySQL versions prior to 5.7.x are also distinguished. The old version generates 16-bit ciphertext and the new version has 41-bit.
The PASSWORD() function encryption is irreversible. If you need to compare the encrypted content in the database, you can only compare the encrypted content;
Specific examples are as follows:
mysql> SELECT PASSWORD("123456");
+-------------------------------------------+
| PASSWORD("123456") |
+-------------------------------------------+
| *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-------------------------------------------+
mysql> select LENGTH(PASSWORD("123456"));
+----------------------------+
| LENGTH(PASSWORD("123456")) |
+----------------------------+
| 41 |
+----------------------------+
mysql> SELECT IF(PASSWORD("123456") = "*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9", true, false) isEqual;
+---------+
| isEqual |
+---------+
| 1 |
+---------+2. Encryption and compression function
Detailed instructions on the official website: https://dev.mysql.com/doc/refman/8.0/en/encryption-functions.html#function_password
| name | description |
| AES_DECRYPT() |
Use AES encryption |
| AES_ENCRYPT() | Decrypt using AES |
| COMPRESS() | Return the result as a binary string |
| MD5 () | Calculate MD5 checksum |
| RANDOM_BYTES() | Returns a random byte vector |
| SHA1(), SHA() | Calculate the SHA-1 160-bit checksum |
| SHA2 () | Calculate the SHA-2 checksum |
| STATEMENT_DIGEST() | Calculate the statement digest hash value |
| STATEMENT_DIGEST_TEXT() | Calculate the normalized sentence summary |
| UNCOMPRESS() | Decompress string compression |
| UNCOMPRESSED_LENGTH() | Returns the length of the string before compression |
| VALIDATE_PASSWORD_STRENGTH() | Determine password strength |
Many encryption and compression functions return strings, and their results may contain arbitrary byte values. If you want to store these results, use a column with a VARBINARY or BLOB binary string data type. This avoids the data value that will change after space removal or character set conversion, for example, if you use a non-binary string data type, it may appear (potential problems CHAR, VARCHAR, TEXT).