Why Are My 4-Byte Emojis Showing as Question Marks in My MySQL Database (utf8mb4)?

UTF-8 MB4 Character (Emoji) Insertion in MySQL

Problem:

MySQL 5.5.10 is configured with the utf8mb4 character set. However, upon insertion, emojis represented by 4-byte codes are converted to question marks ('???'). This occurs with iOS5 emojis but not with iOS4 emojis.

Solution:

1. Comprehensive Character Set Configuration:

• Ensure that all tables' default character sets and text fields are set to utf8mb4.

• Set client and server character sets to utf8mb4.

  2. Application Layer Character Set:

• Set the character set of the database connection in the app layer to utf8mb4.

• Update or compile the database client library if necessary to ensure utf8mb4 support.

  3. MySQL Client Display:

• Run SET NAMES utf8mb4 before queries when viewing data via the mysql client. Ensure the machine can display emojis.

Additional Considerations:

• Confirm that all application components fully support 4-byte Unicode characters.
• Consider backing up data before converting to utf8mb4.

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