, . (), () mechanism, , .
. , .Java. , , , JDBC (Java Database Connectivity). . 4.18 , JDBC.
. 4.18. , JDBC
, , :
JDBC (DriverManager, Connection, Statement, ResultSet), ( SQL). Middleware .
<<role>>, (placeholders) , . :
DBClass . (persistent) , , , , ( ). , Information Expert , - Course . , , , Course JDBC. ( ) , Course DBCourse.
PersistencyClient , , , .
PersistentClass -, .
PersistentClassList , DBClass.read().
, JDBC ( DBClass), . , (create), . 4.19.
. 4.19 , ( ) PersistencyClient. DBClass. DBClass PersistentClass . DBClass SQL, createStatement() Connection. .
. 4.19. create