The following 14 techniques, many people in a large number of database analysis and design practice, summed up gradually. For the use of these experiences, the reader can not help bowls of Health, by ...
foreign key (RSS)
1, one-on-one relationships: Description: Student and Certificate is a one-on-one relationship; # 1) based on the primary key of the associated Student.hbm.xml (Main): <one-to-one name="cer&qu ...
Experience: A, hibernate always concern only one attribute, rather than the database table. That is why inverse property is not on when more than one Item, the database is updated by the Bid on behalf ...
preservation of the cascade hibernate there are two keywords: 1. Cascade: when adding an object to add the associated object at the same time 2. Inverse: to maintain the relationship between the perfo ...
Database development norms Database development norms 1. Field data sheets and design Table design principles 1, standardization and regularization Standardization of data in the database help to elim ...
The following 14 techniques are lot of people at many database analysis and design practice, summed up gradually. For the use of these experiences, the reader can not help bowls of Health, by rote, an ...
1. Original documents and the relationship between entities can be one-on-one, one-to-many, many-to-many relationship. Under normal circumstances, they are one-on-one relationship: the one and only or ...
At J2ee applications, if the Hibernate framework, can be automatically set up the database entities and the Java entity class mapping relations procedures greatly facilitate Java Persistence object ac ...
1. Original documents and the relationship between entities can be one-on-one, one-to-many, many-to-many relationship. Under normal circumstances, they are one-on-one relationship: the one and only or ...