ConnectionPool Class
A lightweight standalone JDBC connection pool manager.
Constructors
public ConnectionPool( javaxt.sql.Database database, int maxConnections )
public ConnectionPool( javaxt.sql.Database database, int maxConnections, int timeout )
public ConnectionPool( javax.sql.ConnectionPoolDataSource dataSource, int maxConnections )
public ConnectionPool( javax.sql.ConnectionPoolDataSource dataSource, int maxConnections, Integer timeout )
Methods
close( ) returns void
Closes all unused pooled connections.
getActiveConnections( ) returns int
Returns the number of active (open) connections of this pool.
This is the number of Connection objects that have been
issued by {@link #getConnection()}, for which Connection.close()
has not yet been called.
getConnection( ) returns javaxt.sql.Connection
Retrieves a connection from the connection pool.
If maxConnections connections are already in use, the method
waits until a connection becomes available or timeout seconds elapsed.
When the application is finished using the connection, it must close it
in order to return it to the pool.
getConnectionPoolDataSource( ) returns javax.sql.ConnectionPoolDataSource
getInactiveConnections( ) returns int
Returns the number of inactive (unused) connections in this pool.
This is the number of internally kept recycled connections,
for which Connection.close() has been called and which
have not yet been reused.
getMaxConnections( ) returns int
getTimeout( ) returns int
getValidConnection( ) returns javaxt.sql.Connection
Retrieves a connection from the connection pool and ensures that it is valid
by calling {@link Connection#isValid(int)}.
If a connection is not valid, the method tries to get another connection
until one is valid (or a timeout occurs).
Pooled connections may become invalid when e.g. the database server is
restarted.
This method is slower than {@link #getConnection()} because the JDBC
driver has to send an extra command to the database server to test the connection.
This method requires Java 1.6 or newer.