Introduction to Entity Beans 131 (Post office web site) Container Bean Instance
Introduction to Entity Beans 131 Container Bean Instance Passivation entails a state save. 1: ejbStore() 2: ejbPassivate() Activation entails a state load. 1: ejbActivate() 2: ejbLoad() Figure 6.5 Passivation of entity beans entails a state save, and activation entails a state load. There Are Two Ways to Persist Entity Beans Since entity beans map to storage, someone needs to write the database access code. A bean-managed persistent entity bean is an entity bean that must be persisted by hand. In other words, you as the component developer must write code to translate your in-memory fields into an underlying data store, such as a relational database or an object database. You handle the persistent operations yourself including saving, loading, and finding data within the entity bean. Therefore, you must write to a persistence API, such as JDBC. For example, with a relational database, your entity bean could perform a SQL INSERT statement via JDBC to stick some data into a relational database. You could also perform an SQL DELETE statement via JDBC to remove data from the underlying store.
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