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Which function is synonymous with the MySQL LENGTH() function?

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2023-08-23 12:33:141171browse

MySQL LENGTH()函数的同义函数是哪个?

We know that MySQL's OCTET_LENGTH() function also measures the string length in "bytes", so it is a synonym for the MySQL LENGTH() function. The syntax of this function is OCTET_LENGTH(Str), where Str is the character string to be returned.

It also does not support multi-byte security like the LENGTH() function. For example, if a string contains four 2-byte characters, the OCTET_LENGTH() function will return 8. Demonstrated in the example below −

Example

mysql> Select OCTET_LENGTH('tutorialspoint');
+--------------------------------+
| OCTET_LENGTH('tutorialspoint') |
+--------------------------------+
|                             14 |
+--------------------------------+
1 row in set (0.00 sec)

The above result set shows that the string "tutorialspoint" has a length of 14 because it has not been converted to Unicode characters. The following query converts it to Unicode characters −

mysql> SET @A = CONVERT('tutorialspoint' USING ucs2);
Query OK, 0 rows affected (0.02 sec)

After converting the string to Unicode, the result is 28 instead of 14 because in Unicode, one character takes 2 bytes as shown below −

mysql> Select OCTET_LENGTH(@A);
+------------------+
| OCTET_LENGTH(@A) |
+------------------+
|               28 |
+------------------+
1 row in set (0.00 sec)

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