JPA , - JAVA API , . JPA (, , ), EJB3 .
JPA , , JPA : - . JPA , . JPA , , . , , JPA , . .
Entity bean , (persistent) , , , . Entity beans . , entity beans , "", , ( , "" ). , entity bean - , SELECT. - , entity bean , .
JDBC (. Java DataBase Connectivity Java) - Java- , java.sql, Java SE. JDBC , URL. ( ). , , URL, , . JDBC, , SQL , .
DAO Java-. , , DAO, :
DAO .
DAO . , DAO.DAO , ( ), ( , CRUD (create, read, update, delete)) . DAO , , . finder finders. finder , DAO.DAO , . DAO .
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Session bean EJB-, . "" , , ( ), . , . session bean "", - HTML- , , . -, , session bean . , , session bean , - " ", .
Facade () . . third-party . API . , . , . Facade. , , , . , , , . , , .