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Another much more important advantage is the ability to handle polymorphic associations; for example, an association mapping from User to BillingDetails would now be possible. Hibernate can use a UNION query to simulate a single table as the target of the association mapping. We cover this topic in detail in chapter 7, section 7.3, Polymorphic associations. So far, the inheritance mapping strategies we ve discussed don t require extra consideration with regard to the SQL schema. No foreign keys are needed, and relations are properly normalized. This situation changes with the next strategy. java ean 13 java - Hold and validate an EAN13 code - Code Review Stack Exchange
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Barcode4J is a flexible generator for barcodes written in Java . ... Codabar; UPC- A and UPC-E (with supplementals); EAN - 13 and EAN-8 (with supplementals) ... An entire class hierarchy can be mapped to a single table. This table includes columns for all properties of all classes in the hierarchy. The concrete subclass represented by a particular row is identified by the value of a type discriminator column. This approach is shown in figure 5.2. This mapping strategy is a winner in terms of both performance and simplicity. It s the best-performing way to represent polymorphism both polymorphic and nonpolymorphic queries perform well and it s even easy to implement by hand. Ad-hoc reporting is possible without complex joins or unions. Schema evolution is straightforward. dist.dir=/project/dist masterbuild.xml in /project <property name="dist.dir" location="dist"> <echo>build dir=${dist.dir}</echo> <ant dir="child1" inheritAll="true"/> <ant dir="child2" inheritAll="true"/> java ean 13 check digit Java Code Examples org.apache.commons.validator.routines ...
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Barcode4J is a flexible generator for barcodes written in Java . ... Codabar; UPC- A and UPC-E (with supplementals); EAN - 13 and EAN-8 (with supplementals) ... There is one major problem: Columns for properties declared by subclasses must be declared to be nullable. If your subclasses each define several nonnullable properties, the loss of NOT NULL constraints may be a serious problem from the point of view of data integrity. Another important issue is normalization. We ve created functional dependencies between nonkey columns, violating the third normal form. As always, denormalization for performance can be misleading, because it sacrifices long-term stability, maintainability, and the integrity of data for immediate gains that may be also achieved by proper optimization of the SQL execution plans (in other words, ask your DBA). In Hibernate, you use the <subclass> element to create a table per class hierarchy mapping, as in listing 5.2. dist.dir=/project/dist build.xml in /project/child1 <property name="dist.dir" location="dist"> <echo>build dir=${dist.dir}</echo> <hibernate-mapping> <class name="BillingDetails" table="BILLING_DETAILS"> <id name="id" column="BILLING_DETAILS_ID" type="long"> <generator class="native"/> </id> <subclass name="CreditCard" discriminator-value="CC"> <property name="number" column="CC_NUMBER"/> <property name="expMonth" column="CC_EXP_MONTH"/> <property name="expYear" column="CC_EXP_YEAR"/> </subclass> <subclass name= BankAccount discriminator-value= BA > dist.dir=/project/dist build.xml in /project/child2 <property name="dist.dir" location="dist"> <echo>build dir=${dist.dir}</echo> The root class BillingDetails of the inheritance hierarchy is mapped to the table BILLING_DETAILS. You have to add a special column to distinguish between persistent classes: the discriminator. This isn t a property of the persistent class; it s used internally by Hibernate. The column name is BILLING_DETAILS_TYPE, and the values are strings in this case, CC or BA . Hibernate automatically sets and retrieves the discriminator values. Properties of the superclass are mapped as always, with a simple <property> element. Every subclass has its own <subclass> element. Properties of a subclass are mapped to columns in the BILLING_DETAILS table. Remember that NOT NULL constraints aren t allowed, because a BankAccount instance won t have an expMonth property, and the CC_EXP_MONTH field must be NULL for that row. The <subclass> element can in turn contain other nested <subclass> elements, until the whole hierarchy is mapped to the table. Hibernate generates the following SQL when querying the BillingDetails class: Figure 9.3 A master build can set the properties for the child projects, even if those projects try to override them. If the master build had accidentally used value instead of location, the directory location would have been resolved in the client build files relative to their own directory, which is not what we desire. select BILLING_DETAILS_ID, BILLING_DETAILS_TYPE, OWNER, CC_NUMBER, CC_EXP_MONTH, ..., BA_ACCOUNT, BA_BANKNAME, ... from BILLING_DETAILS java ean 13 EAN - 13 Java Barcode Generator /Class - TarCode.com
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