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一、代码 1. 2. 3. 二、相比上一个方法的优点 1.查询父类不用再通过多次select,而是通过union all,the query select bd from BillingDetails bd generates the following SQL statement: 2.Anoth 阅读全文
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一、结构 二、代码 1. 2. 3. 三、存在的问题 1.it doesn’t support polymorphic associations very well。You can’t have another entity mapped with a foreign key “referencin 阅读全文
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There are four different strategies for representing an inheritance hierarchy: Use one table per concrete class and default runtime polymorphic behav 阅读全文
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一、结构 二、Hibernate支持的UserTypes接口 UserType —You can transform values by interacting with the plain JDBC PreparedStatement (when storing data) and Resul 阅读全文
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一、结构 二、代码 1. 2. 3. 4. 5. 6. 7. 8. 9. 也可以转换集合，If several @Convert annotations are required on a single embedded property, to convert several attributes 阅读全文
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一、简介 1. 2. 3. 4. to override this default mapping. The JPA specification has a convenient shortcut annotation for this purpose, @Lob This maps the byt 阅读全文
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一、数据库 二、代码 1. 2. 3. You can declare @AttributeOverride s at any level, as you do for the name property of the City class, mapping it to the CITY colum 阅读全文
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Each @AttributeOverride for a component property is “complete”: any JPA or Hibernate annotation on the overridden property is ignored. This means the 阅读全文
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一、数据库 二、代码 1. You should override the equals() and hashCode() methods of Address and compare instances by value. 2. 3. 三、 阅读全文
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一、简介 在JPA中，默认所有属性都会persist,属性要属于以下3种情况，Hibernate在启动时会报错 1.java基本类型或包装类 2.有注解 @Embedded 3.有实现java.io.Serializable 二、Overriding basic property defaults 阅读全文