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MySQL SUBSTRING() with non-utf8 encoding


MySQL SUBSTRING() with non-utf8 encoding

By : Jane Marshal
Date : October 14 2020, 02:24 PM
I wish this help you User error.
When you say SET NAMES latin1, you are announcing to MySQL that the bytes coming from the client (you) are encoded in latin1. But they weren't. They were still in utf8.
code :


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could not retrieve utf8 encoding value from mysql

could not retrieve utf8 encoding value from mysql


By : Rogerio Raymundo
Date : March 29 2020, 07:55 AM
hope this fix your issue The fact that the PHP file is in UTF-8 doesn't necessarily mean that the data coming from/ going to the database is in UTF-8 too.
You didn't mention which extension you're using, but:
utf8 encoding in Perl and MySql

utf8 encoding in Perl and MySql


By : user5315392
Date : March 29 2020, 07:55 AM
this will help If each ä/å/ö is being represented in the output by two bytes, then it's also possible that you may be double-encoding the characters. (Given that the question already shows you doing $dbh->{'mysql_enable_utf8'} = 1;, I suspect that this is the most likely case.) Another possibility, given that you're displaying this on a web page, is that the page may not be specifying that the charset is UTF-8 in its and the browser could be guessing incorrectly at the character encoding it uses.
Take a close look at your webapp framework, templating system, etc. to ensure that the values are only being encoded once between when they're retrieved from the database and when they reach the user's browser. Many frameworks/template engines (such as the combination of Dancer and TT that I normally use) will handle output encoding automatically if you configure them correctly, which means that the data will be double-encoded if it's explicitly encoded prior to being output.
Difference between Convert.ToBase64String/Convert.FromBase64String and Encoding.UTF8.GetBytes/Encoding.UTF8.GetString

Difference between Convert.ToBase64String/Convert.FromBase64String and Encoding.UTF8.GetBytes/Encoding.UTF8.GetString


By : winternights
Date : March 29 2020, 07:55 AM
around this issue UTF-8 is a character encoding. It encodes Unicode codepoints (characters) into bytes.
Base64 is a binary-to-text encoding. It encodes bytes to text.
What is the reason that Encoding.UTF8.GetString and Encoding.UTF8.GetBytes are not inverse of each other?

What is the reason that Encoding.UTF8.GetString and Encoding.UTF8.GetBytes are not inverse of each other?


By : Ethlinn
Date : March 29 2020, 07:55 AM
it should still fix some issue They're inverses if you start with a valid UTF-8 byte sequence, but they're not if you just start with an arbitrary byte sequence.
Let's take a concrete and very simple example: a single byte, 0xff. That's not the valid UTF-8 encoding for any text. So if you have:
code :
byte[] bytes = { 0xff };
string text = Encoding.UTF8.GetString(bytes);
string text = GetRandomText();
byte[] bytes = Encoding.UTF8.GetBytes(text);
string text2 = Encoding.UTF8.GetString(bytes);
C# Mysql UTF8 Encoding

C# Mysql UTF8 Encoding


By : hala mosa
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I have a mysql database with utf8_general_ci encoding ,
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