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MySQL 5.7 Reference Manual  /  ...  /  Condition Handling and OUT or INOUT Parameters

13.6.7.8 Condition Handling and OUT or INOUT Parameters

If a stored procedure exits with an unhandled exception, modified values of OUT and INOUT parameters are not propogated back to the caller.

If an exception is handled by a CONTINUE or EXIT handler that contains a RESIGNAL statement, execution of RESIGNAL pops the Diagnostics Area stack, thus signalling the exception (that is, the information that existed before entry into the handler). If the exception is an error, the values of OUT and INOUT parameters are not propogated back to the caller.