How Can I Efficiently Perform INSERT ... ON DUPLICATE KEY UPDATE in SQLAlchemy?

Performing an INSERT ... ON DUPLICATE KEY UPDATE in SQLAlchemy

SQLAlchemy offers a concise method for executing INSERT ... ON DUPLICATE KEY UPDATE statements.

With ON DUPLICATE KEY UPDATE in the SQL Statement

For direct inclusion of the ON DUPLICATE KEY UPDATE clause in the generated SQL, the @compiles decorator can be employed. A compilable function can be crafted to append the desired string to the INSERT statement.

Within the ORM

While SQLAlchemy does not natively support ON DUPLICATE KEY UPDATE in its ORM, it provides the merge() function. This function compares the primary key value of an object to determine whether an UPDATE or an INSERT should be performed. However, merge() is limited to primary keys.

Alternative for Non-Primary Keys

To achieve ON DUPLICATE KEY UPDATE functionality with non-primary keys, a custom function similar to Django's get_or_create() can be created. This function checks for an existing instance in the database and returns the found instance or creates a new one if none exists.

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