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<p style="margin: 10px 0 0 0">Here are the things we need from "temp table support":</p>
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The ability to export <b>needed</b> persistent and global-temp-table definitions to the database (<tt>MultiTableBulkIdStrategy#prepare</tt> currently).
</li>
<li>
The (configurable) ability to cleanup exported persistent and global-temp-table definitions from the database (<tt>MultiTableBulkIdStrategy#release</tt> currently).
</li>
<li>
The ability to export local-temp-tables "on demand"
</li>
<li>
The ability to clean up local-temp-tables after use if indicated by env.
</li>
<li>
The ability to execute inserts into the bulk-id table
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<li>
The ability to use the bulk-id table in subselects
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<p style="margin: 10px 0 0 0">The first 4 all relate to managing the bulk-id table definitions. The last 2 relate to using the bulk-id table to perform the multi-table update/delete. The last 2 have a variation such that the persistent table case needs to manage a "session identifier" column whereas the local-temp-table and global-temp-table cases do not.</p>
<p style="margin: 10px 0 0 0">When we need to create/drop (manage) the bulk-id table definitions depends on the strategy in use. For persistent and global-temp strategies, this happens around the SessionFactory starting and stopping. For the local-temp strategy, this happens as we need the bulk-id tables (for each session). The part I struggle with is that in the one case (persistent and global-temp strategies) we can use the DDL immediately and not have to keep it around; in the second (local-temp strategy) we do. And the fact that this leaks outside of the strategy. One possible solution there is to have the local-temp strategy itself keep track of the necessary DDL per-entity rather than the persisters having to conditionally store it or not (leakage).</p>
<p style="margin: 10px 0 0 0">Dove-tailing into that, I think it also does not make sense for <tt>PersistentClass#prepareTemporaryTables</tt> to store its work on PersistentClass itself. I think a signature change is in order there to have that method return the <tt>Table</tt>. We can then pass those (singly or all-together) to the strategy for export and pass the name to the persisters for it to know.</p>
<p style="margin: 10px 0 0 0">I'd like to follow a similar pattern for the last 2 goals as well. The strategy ought to be the thing that drives the generation of the bulk-id table insert statement, the generation of the bulk-id table subselect and any binding of parameters (session identifier).</p>
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