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Description

MySQL Error 1445 occurs when a stored function or trigger attempts to modify the `autocommit` system variable. MySQL explicitly prohibits changing transaction control variables like `autocommit` within these types of stored programs to maintain predictable transaction behavior and prevent unexpected side effects.

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Error Message

Not allowed to set autocommit from a stored function or trigger

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Known Causes

3 known causes

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Explicit SET autocommit

The stored function or trigger directly contains a `SET autocommit = ...` statement, which is disallowed.

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Misunderstanding Autocommit Scope

The developer incorrectly assumes that `autocommit` behavior can be altered at the routine level, independent of the session or global settings.

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Attempting Transaction Override

An attempt is made to force specific transaction behavior within the routine by directly manipulating `autocommit`, which is not permitted.

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Solutions

3 solutions available

1. Remove Autocommit Setting from Stored Program easy

The most direct solution is to simply remove any `SET autocommit = ...` statements from your stored functions or triggers.

1

Identify the stored function or trigger that is causing the error. This is usually indicated in the error message or by tracing the execution flow.

2

Open the stored program in your MySQL client or editor.

3

Locate and delete any lines that explicitly set the `autocommit` variable. For example, remove lines like `SET autocommit = 1;` or `SET autocommit = 0;`.

DELETE FROM your_stored_program WHERE statement LIKE 'SET autocommit%';

4

Save the modified stored program.

5

Recompile or re-create the stored program in your MySQL database.

DELIMITER $$ 
CREATE OR REPLACE FUNCTION your_function_name(...) RETURNS ... 
BEGIN 
  -- ... your logic without SET autocommit ... 
END$$ 
DELIMITER ;

2. Manage Transactions Explicitly Outside Stored Programs medium

If you need transactional control, manage `START TRANSACTION`, `COMMIT`, and `ROLLBACK` statements in the application code that calls the stored program.

1

Review your application code that interacts with the MySQL database. Identify where stored functions or triggers are being called.

2

Ensure that any `SET autocommit = 0;` statements are removed from your stored programs (as per the previous solution).

3

In your application code, before calling the stored program, start a transaction using `START TRANSACTION;`.

START TRANSACTION;

4

Call your stored function or trigger.

SELECT your_function_name(...);

5

If the stored program executed successfully, commit the transaction: `COMMIT;`.

COMMIT;

6

If an error occurred during the execution of the stored program or subsequent operations, roll back the transaction: `ROLLBACK;`.

ROLLBACK;

7

Implement error handling in your application to detect issues and trigger the `ROLLBACK`.

3. Re-architect Stored Program Logic advanced

If the need to set autocommit stems from a requirement to control transactional behavior within the stored program, consider redesigning the stored program to avoid this necessity.

1

Analyze why `autocommit` was being set within the stored program. What specific transactional behavior was intended?

2

If the goal was to ensure atomicity of operations within the stored program, consider breaking down the logic into smaller, manageable units. The calling application can then manage transactions around these units.

3

Alternatively, if the stored program needs to perform multiple operations that must succeed or fail together, consider creating a stored procedure instead of a stored function. Stored procedures can manage their own transactions more effectively (though `SET autocommit` is still disallowed).

DELIMITER $$ 
CREATE PROCEDURE your_procedure_name(...) 
BEGIN 
  START TRANSACTION; 
  -- ... your operations ... 
  -- If all operations successful: 
  COMMIT; 
  -- If any operation failed: 
  -- ROLLBACK; 
END$$ 
DELIMITER ;

4

If the stored program is part of a larger transactional context, ensure that the calling application is handling the overall transaction management.

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Related Errors

5 related errors

MySQL Error 1445: Autocommit in Stored Programs