Question

I am creating table with sqlalchemy.

user = Table('users', Metadata,
Column('datecreated', TIMESTAMP,                                  
            server_default=text('CURRENT_TIMESTAMP')),            
Column('datemodified', TIMESTAMP,                                 
               server_onupdate=text('CURRENT_TIMESTAMP')),
)

But this will not set DEFAULT ON UPDATE CURRENT_TIMESTAMP.

I checked out How do you get SQLAlchemy to override MySQL "on update CURRENT_TIMESTAMP" but that will for literal I need to wire that in create table definition.

Answer 1

If you’re on MySQL 5.6 or later please scroll down for the relevant answer. Users of older versions, please read this one.

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Until MySQL 5.6. in one table, you can only have one ‘automated’ TIMESTAMP column.

From: http://dev.mysql.com/doc/refman/5.5/en/timestamp.html

For one TIMESTAMP column in a table, you can assign the current
timestamp as the default value and the auto-update value. It is
possible to have the current timestamp be the default value for
initializing the column, for the auto-update value, or both. It is not
possible to have the current timestamp be the default value for one
column and the auto-update value for another column.