[Sqlalchemy-tickets] [sqlalchemy] #2843: Support for IF EXISTS/IF NOT EXISTS DDL constructs

[sqlalchemy <mi...@zz...>]

#2843: Support for IF EXISTS/IF NOT EXISTS DDL constructs
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 Reporter:  remyroy      |           Owner:  zzzeek
     Type:  enhancement  |          Status:  new
 Priority:  low          |       Milestone:
Component:  schema       |        Severity:  no triage selected yet
 Keywords:               |  Progress State:  awaiting triage
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 IF EXISTS and IF NOT EXISTS are already part of many DBMSs DDL vocabulary.
 They have many use cases which are highly useful in some situations.

 For instance, creating a table if it does not already exists or dropping a
 column if it exists.

 It would be nice to have those directives with standard SQLAlchemy DDL
 methods. I guess they could be implemented using the native support for
 DBMSs that support them or with some introspection for those that do not.

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2843>
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