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Selecting a fetch strategy talking about inheritance hierarchies that should be reconsidered to accommodate the fact that after all, you re working with an SQL database). Switching to additional selects In mapping metadata, you can then tell Hibernate to switch to a different fetching strategy. You want some parts of your inheritance hierarchy to be fetched with immediate additional SELECT statements, not with an OUTER JOIN in the initial query. The only way to enable this fetching strategy is to refactor the mapping slightly, as a mix of table-per-hierarchy (with a discriminator column) and table-per-subclass with the mapping: … … … This mapping breaks out the CreditCard and BankAccount classes each into its own table but preserves the discriminator column in the superclass table. The fetching strategy for CreditCard objects is select, whereas the strategy for BankAccount is the default, join. Now, if you query for all BillingDetails, the following SQL is produced:
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