JDBC 3.0
At the time of this writing, Version 3.0
of the JDBC API was in its fourth proposed final draft, and was on
target for inclusion in J2SE and J2EE Version 1.4. JDBC 3.0 adds
increased support for SQL99 features, increasingly capable
transaction support, full read/write handling of BLOB and CLOB
fields, URL datatypes, and various minor enhancements to the rest of
the API. JDBC 3.0 adds a number of methods to the
DatabaseMetaData
interface, allowing programmers to
determine which new features are supported.
JDBC 3.0 is also intended to integrate well with the J2EE Connector standard, allowing drivers and configuration information to be packaged into a Resource adapter ARchive, or RAR file. This allows easier deployment of JDBC connections into a J2EE server, but doesn’t change the way programmers interact with the API.
Savepoints
Savepoints
allow transactions to be partially rolled back. If the underlying
database and driver support the functionality, the new
setSavepoint(String name)
method of Connection creates a named savepoint in
the current transaction, and returns an object implementing the
Savepoint interface. The object can be passed to
the rollback( )
method of
Connection to roll back all components of the
current transaction that took place after the setSavepoint( ) method was called:
Statement stmt = con.createStatement( ); stmt.executeUpdate("delete from clients"); stmt.executeUpdate("insert into clients (NAME, ID) values ('Charles Babbage', 1)"); Savepoint ...Get Java Enterprise in a Nutshell, Second Edition now with the O’Reilly learning platform.
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