Can MySQL be Configured to Truncate Excessively Long Data Consistently?

MySQL Data Truncation or Error Handling

MySQL handles data truncation differently depending on its settings. In some cases, it truncates excessive data silently, while in others, it throws an error.

Issue:

A user has two MySQL instances where one instance truncates data when it's too long, and the other raises an error.

Question:

Is there a way to configure MySQL to consistently truncate too long data, similar to the first instance?

Answer:

Yes, disabling the SQL mode settings STRICT_TRANS_TABLES and STRICT_ALL_TABLES will enable automatic truncation of inserted strings.

Implementation:

SET GLOBAL sql_mode = '...,-STRICT_TRANS_TABLES,-STRICT_ALL_TABLES';

Explanation:

STRICT_TRANS_TABLES and STRICT_ALL_TABLES enforce stricter data validation rules. Disabling these settings relaxes the validation, allowing for automatic truncation.

Reference:

MySQL Server SQL Modes: https://dev.mysql.com/doc/refman/8.0/en/sql-mode.html

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