com.ds.common.database

类 DbManager

java.lang.Object

com.ds.common.database.DbManager

public class DbManager
extends Object

The Manager provides connections and manage transaction transparently. The Manager is a singleton, you get its instance with the getInstance() method. It is used by all the XxxxManager to get database connection. Before doing any operation, you must pass to the manager either a datasource or a jdbc driver/url/username/password You may extend it and use setInstance() method to make sure your implementation is used as a singleton.

字段概要

字段

限定符和类型	字段和说明
static String	THREAD_LOCK

方法概要

限定符和类型	方法和说明
Connection	beginTransaction() When working within a transaction, you should invoke this method first.
void	close(ResultSet rs) Close the passed ResultSet.
void	close(Statement s) Close the passed Statement.
void	close(Statement s, ResultSet rs) Close the passed Statement and ResultSet.
void	endTransaction(boolean commit) Release connection used for the transaction and perform a commit or rollback.
Connection	getConnection() Get an auto commit connection.
static DbManager	getInstance(String configKey)
void	log(String message) Log a message using the underlying logwriter, if not null.
void	releaseConnection(Connection c) Release the connection.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

字段详细资料

THREAD_LOCK

public static final String THREAD_LOCK

另请参阅:

常量字段值

方法详细资料

getInstance

public static DbManager getInstance(String configKey)

getConnection

public Connection getConnection()
                         throws SQLException

Get an auto commit connection. Normally you you not need this method that much ;-)

返回:

an auto commit connection.

抛出:

SQLException

releaseConnection

public void releaseConnection(Connection c)

Release the connection. Normally you should not need this method ;-)

beginTransaction

public Connection beginTransaction()
                            throws SQLException

When working within a transaction, you should invoke this method first. The connection is returned just in case you need to set the isolation level or else.

返回:

a non-auto commit connection with the default transaction isolation level.

抛出:

SQLException

endTransaction

public void endTransaction(boolean commit)
                    throws SQLException

Release connection used for the transaction and perform a commit or rollback.

参数:

commit - tells whether this connection should be committed: true for commit(), false for rollback()

抛出:

SQLException

log

public void log(String message)

Log a message using the underlying logwriter, if not null.

close

public void close(Statement s)

Close the passed Statement.

close

public void close(ResultSet rs)

Close the passed ResultSet.

close

public void close(Statement s,
                  ResultSet rs)

Close the passed Statement and ResultSet.