The mysql.connector.errors module defines exception classes for errors and warnings raised by MySQL Connector/Python. Most classes defined in this module are available when you import mysql.connector.

The exception classes defined in this module mostly follow the Python Database Specification v2.0 (PEP-249). For some MySQL client or server errors it is not always clear which exception to raise. It is good to discuss whether an error should be reclassified by opening a bug report.

MySQL Server errors are mapped with Python exception based on their SQLSTATE value (see Server Error Codes and Messages). The following table shows the SQLSTATE classes and the exception Connector/Python raises. It is, however, possible to redefine which exception is raised for each server error. Note that the default exception is DatabaseError.