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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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select b1.BILLING_DETAILS_ID, b1.OWNER, b1.USER_ID, b2.ACCOUNT, b2.BANKNAME, b2.SWIFT, b1.BILLING_DETAILS_TYPE as clazz from BILLING_DETAILS b1 left outer join BANK_ACCOUNT b2 on b1.BILLING_DETAILS_ID = b2.BANK_ACCOUNT_ID select cc.NUMBER, cc.EXP_MONTH, cc.EXP_YEAR from CREDIT_CARD cc where cc.CREDIT_CARD_ID = select cc.NUMBER, cc.EXP_MONTH, cc.EXP_YEAR from CREDIT_CARD cc where cc.CREDIT_CARD_ID =

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7. On the Install Printer Software page, in the Manufacturer list, select HP. In the Printers list, select HP Color LaserJet 4550 PS printer. Click Next.

The first SQL SELECT retrieves all rows from the superclass table and all rows from the BANK_ACCOUNT table. It also returns discriminator values for each row as the clazz column. Hibernate now executes an additional select against the CREDIT_ CARD table for each row of the first result that had the right discriminator for a CreditCard. In other words, two queries mean that two rows in the BILLING_ DETAILS superclass table represent (part of) a CreditCard object. This kind of optimization is rarely necessary, but you now also know that you can switch from a default join fetching strategy to an additional immediate select whenever you deal with a <join> mapping. We ve now completed our journey through all options you can set in mapping metadata to influence the default fetch plan and fetching strategy. You learned how to define what should be loaded by manipulating the lazy attribute, and how it should be loaded by setting the fetch attribute. In annotations, you use FetchType.LAZY and FetchType.EAGER, and you use Hibernate extensions for more fine-grained control of the fetch plan and strategy. Knowing all the available options is only one step toward an optimized and efficient Hibernate or Java Persistence application. You also need to know when and when not to apply a particular strategy.

The selected driver is digitally signed to ensure reliability and to protect your system. Driver signing is covered in 6, Installing, Managing, and Troubleshooting Hardware Devices and Drivers.

8. On the Name Your Printer page, in the Printer Name list box, the Add Printer Wizard suggests a printer name based on the printer model. For this exercise, do not change this name. 9. If other printers are already installed, the wizard also asks whether you want to make this the default printer. If the Add Printer Wizard displays the Do You Want To Use This Printer As The Default Printer message, click Yes. 10. Click Next to continue. 11. On the Printer Sharing page, click Share Name. 12. In the Share Name box, type Printer1, and then click Next.

By default, Hibernate never loads data that you didn t ask for, which reduces the memory consumption of your persistence context. However, it also exposes you to the so-called n+1 selects problem. If every association and collection is

The Add Printer Wizard suggests a share name that is a shortened version of the printer name. The shared printer name is used to identify a printer on the network. Some operating systems (such as Windows 3.1) recognize share names up to only 12 characters. If such clients will connect to the printer, you should use a name that is 12 characters or fewer; otherwise, you can use a longer name.

13. On the Location And Comment page, type second floor west and in the Comment text box type mail room room 2624. Click Next.