MySQL don't want to store unicode character

Question

Why won't MySQL store the unicode character

标签： mysql unicode utf8mb4

举报

Answer 1

First: your statement

UTF16 is U+2B5EE

is slightly wrong. U+2B5EE is the notation for a Unicode codepoint, just a integer number- an abstract code- while UTF16 is a charset encoding (one of possible Unicode encodings, as is UTF-8).

Now, assuming that you mean the codepoint, U+2B5EE is outside the BMP (first 64K unicode codepoints), and it seems mysql have little or no support for them. So I suspect you are out of luck.

Answer 2

Since this question was posted, MySQL 5.5.3 was released which supports the utf8mb4 encoding which offers full Unicode support. Switching to this charset instead of utf8 would fix your problem.

I’ve recently written a detailed guide on how to switch from MySQL’s utf8 to utf8mb4. If you follow the steps there, everything should work correctly. Here are direct links to each individual step in the process:

• Step 1: Create a backup
• Step 2: Upgrade the MySQL server
• Step 3: Modify databases, tables, and columns
• Step 4: Check the maximum length of columns and index keys
• Step 5: Modify connection, client, and server character sets
• Step 6: Repair and optimize all tables

I suspect that your problem can be solved by following step 5. Hope this helps!

Answer 3

MySQL only supports characters from the basic multilingual plane (0x0000 - 0xFFFF).

Your character is out if this plane.

Try storing a synonym instead :)

Update:

MySQL 5.5.3 and on (which has not gone GA yet) does support supplementary characters if you use UTF8MB4 encoding.