org.postgresql.core

Interface ProtocolConnection

public interface ProtocolConnection

Provides access to protocol-level connection operations.

Author:

Oliver Jowett (oliver@opencloud.com)

Field Summary

Fields

Modifier and Type	Field and Description
static int	TRANSACTION_FAILED Constant returned by getTransactionState() indicating that a transaction is currently open, but it has seen errors and will refuse subsequent queries until a ROLLBACK.
static int	TRANSACTION_IDLE Constant returned by getTransactionState() indicating that no transaction is currently open.
static int	TRANSACTION_OPEN Constant returned by getTransactionState() indicating that a transaction is currently open.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Close this connection cleanly.
java.lang.String	getDatabase()
Encoding	getEncoding()
java.lang.String	getHost()
PGNotification[]	getNotifications() Retrieve and clear the set of asynchronous notifications pending on this connection.
int	getPort()
int	getProtocolVersion()
QueryExecutor	getQueryExecutor()
java.lang.String	getServerVersion()
boolean	getStandardConformingStrings() Returns whether the server treats string-literals according to the SQL standard or if it uses traditional PostgreSQL escaping rules.
int	getTransactionState() Get the current transaction state of this connection.
java.lang.String	getUser()
java.sql.SQLWarning	getWarnings() Retrieve and clear the chain of warnings accumulated on this connection.
boolean	isClosed() Check if this connection is closed.
void	sendQueryCancel() Sends a query cancellation for this connection.

Field Detail

TRANSACTION_IDLE

static final int TRANSACTION_IDLE

Constant returned by getTransactionState() indicating that no transaction is currently open.

See Also:

Constant Field Values

TRANSACTION_OPEN

static final int TRANSACTION_OPEN

Constant returned by getTransactionState() indicating that a transaction is currently open.

See Also:

Constant Field Values

TRANSACTION_FAILED

static final int TRANSACTION_FAILED

Constant returned by getTransactionState() indicating that a transaction is currently open, but it has seen errors and will refuse subsequent queries until a ROLLBACK.

See Also:

Constant Field Values

Method Detail

getHost

java.lang.String getHost()

Returns:

the hostname this connection is connected to.

getPort

int getPort()

Returns:

the port number this connection is connected to.

getUser

java.lang.String getUser()

Returns:

the user this connection authenticated as.

getDatabase

java.lang.String getDatabase()

Returns:

the database this connection is connected to.

getServerVersion

java.lang.String getServerVersion()

Returns:

the server version of the connected server, formatted as X.Y.Z.

getEncoding

Encoding getEncoding()

Returns:

the current encoding in use by this connection

getStandardConformingStrings

boolean getStandardConformingStrings()

Returns whether the server treats string-literals according to the SQL standard or if it uses traditional PostgreSQL escaping rules. Versions up to 8.1 always treated backslashes as escape characters in string-literals. Since 8.2, this depends on the value of the standard_conforming_strings server variable.

Returns:

true if the server treats string literals according to the SQL standard

getTransactionState

int getTransactionState()

Get the current transaction state of this connection.

Returns:

a ProtocolConnection.TRANSACTION_* constant.

getNotifications

PGNotification[] getNotifications()
                                  throws java.sql.SQLException

Retrieve and clear the set of asynchronous notifications pending on this connection.

Returns:

an array of notifications; if there are no notifications, an empty array is returned.

Throws:

java.sql.SQLException

getWarnings

java.sql.SQLWarning getWarnings()

Retrieve and clear the chain of warnings accumulated on this connection.

Returns:

the first SQLWarning in the chain; subsequent warnings can be found via SQLWarning.getNextWarning().

getQueryExecutor

QueryExecutor getQueryExecutor()

Returns:

the QueryExecutor instance for this connection.

sendQueryCancel

void sendQueryCancel()
                     throws java.sql.SQLException

Sends a query cancellation for this connection.

Throws:

java.sql.SQLException - if something goes wrong.

close

void close()

Close this connection cleanly.

isClosed

boolean isClosed()

Check if this connection is closed.

Returns:

true iff the connection is closed.

getProtocolVersion

int getProtocolVersion()

Returns:

the version of the implementation