How to Properly Insert 4-Byte Emojis into MySQL?

How to Insert Emoji with 4-Byte Code in MySQL

Inserting 4-byte Unicode characters, such as emojis introduced in iOS5, can pose challenges in MySQL. While MySQL 5.5 supports these characters, additional steps may be necessary to ensure proper storage and display.

Prerequisites

To prepare for 4-byte character insertion:

• Set the character sets and collation for your database, connection, and tables to utf8mb4.
• Ensure your application sets the character set of its database connections to utf8mb4.
• Use a client that supports displaying emojis, such as the MySQL client with SET NAMES utf8mb4 set.

Troubleshooting

If you are still experiencing issues, consider the following:

• Check that all MySQL-related components (client library, server settings, etc.) support utf8mb4.
• Verify that data in tables using utf8 can be converted to utf8mb4 without corruption.
• Ensure that emoji code points are represented correctly (e.g., 3F 3F 3F for '???').

Solution

Observing all these factors should allow your application to store and retrieve iOS5's 4-byte emojis correctly in MySQL. Remember to check the documentation of your app layer and client library for specific implementation details.

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