Package virtuoso.jdbc4

Class VirtuosoConnection

java.lang.Object

virtuoso.jdbc4.VirtuosoConnection

All Implemented Interfaces:

java.lang.AutoCloseable, java.sql.Connection, java.sql.Wrapper

public class VirtuosoConnection
extends java.lang.Object
implements java.sql.Connection

The VirtuosoConnection class is an implementation of the Connection interface in the JDBC API which represents a database connection. A connection to the Virtuoso DBMS can be made with :

   Connection connection = DriverManager.getConnection(url,username,userpassword)
 

, in the case you use a URL like jdbc:virtuoso://host:port or

   Connection connection = DriverManager.getConnection(url)
 

, in the case you use a URL like jdbc:virtuoso://host:port/UID=username/PWD=userpassword

See Also:

Connection, DriverManager.getConnection(String), VirtuosoStatement, VirtuosoPreparedStatement, VirtuosoCallableStatement, VirtuosoDatabaseMetaData

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	VirtuosoConnection.VhostRec

Field Summary

Fields

Modifier and Type	Field	Description
protected java.lang.String	charset
protected boolean	charset_utf8
protected Vector	client_charset
protected java.util.Hashtable<java.lang.Character,java.lang.Byte>	client_charset_hash
protected Vector	client_defaults
protected int	fbs
protected VirtuosoPooledConnection	pooled_connection
protected java.lang.String	qualifier
protected java.util.Hashtable<java.lang.Integer,java.lang.String>	rdf_lang_hash
protected boolean	rdf_lang_loaded
protected java.util.Hashtable<java.lang.String,java.lang.Integer>	rdf_lang_rev
protected java.util.Hashtable<java.lang.Integer,java.lang.String>	rdf_type_hash
protected boolean	rdf_type_loaded
protected java.util.Hashtable<java.lang.String,java.lang.Integer>	rdf_type_rev
protected int	timeout
protected int	timeout_def
protected int	timezoneless_datetimes
protected int	txn_timeout
protected boolean	utf8_execs
protected java.sql.SQLWarning	warning
protected VirtuosoXAConnection	xa_connection

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Method Summary

Modifier and Type	Method	Description
void	abort(java.util.concurrent.Executor executor)	Terminates an open connection.
protected void	addStmtToClose(VirtuosoStatement obj)
void	beginRequest()	Hints to the driver that a request, an independent unit of work, is beginning on this connection.
protected byte[]	charsetBytes(java.lang.String source)
protected byte[]	charsetBytes1(java.lang.String source, java.lang.String from, java.lang.String to)
protected void	checkHoldability(int holdability)	supports only ResultSet.HOLD_CURSORS_OVER_COMMIT for now
protected void	clearFutures()
void	clearWarnings()	Clears all the warnings reported on this Connection object.
void	close()	Close the current connection previously established with Virtuoso DBMS.
void	commit()	Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by the Connection.
java.sql.Array	createArrayOf(java.lang.String typeName, java.lang.Object[] elements)	Factory method for creating Array objects.
java.sql.Blob	createBlob()	Constructs an object that implements the Blob interface.
java.sql.Clob	createClob()	Constructs an object that implements the Clob interface.
java.sql.NClob	createNClob()	Constructs an object that implements the NClob interface.
java.sql.SQLXML	createSQLXML()	Constructs an object that implements the SQLXML interface.
java.sql.Statement	createStatement()	Creates a Statement object to send SQL statements to the Virtuoso DBMS.
java.sql.Statement	createStatement(int resultSetType, int resultSetConcurrency)	Creates a Statement object that will generate ResultSet objects with the given type and concurrency.
java.sql.Statement	createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)	Creates a Statement object that will generate ResultSet objects with the given type, concurrency, and holdability.
java.sql.Struct	createStruct(java.lang.String typeName, java.lang.Object[] attributes)	Factory method for creating Struct objects.
void	endRequest()	Hints to the driver that a request, an independent unit of work, has completed.
protected VirtuosoExplicitString	escapeSQL(java.lang.String sql)
protected VirtuosoExplicitString	escapeSQLString(java.lang.String sql)
void	finalize()	Method runs when the garbage collector want to erase the object
boolean	getAutoCommit()	Returns the current auto-commit state.
protected boolean	getBoolAttr(java.util.Properties info, java.lang.String key, boolean def)
protected int	getCase()	Method uses to get the case.
java.lang.String	getCatalog()	Returns the Connection's current catalog name.
java.util.Properties	getClientInfo()	Returns a list containing the name and current value of each client info property supported by the driver.
java.lang.String	getClientInfo(java.lang.String name)	Returns the value of the client info property specified by name.
protected virtuoso.jdbc4.VirtuosoFuture	getFuture(java.lang.String rpcname, java.lang.Object[] args, int timeout)	Start an RPC function call by sending a VirtuosoFuture request.
int	getHoldability()	Retrieves the current holdability of ResultSet objects created using this Connection object.
protected int	getIntAttr(java.util.Properties info, java.lang.String key, int def)
java.sql.DatabaseMetaData	getMetaData()	Gets the metadata regarding this connection's database.
int	getNetworkTimeout()	Retrieves the number of milliseconds the driver will wait for a database request to complete.
protected java.lang.String	getQualifierName()	Method uses to get the qualifier name of this connection.
java.lang.String	getSchema()	Retrieves this Connection object's current schema name.
protected int	getTimeout()	Method uses to get the I/O timeout.
int	getTransactionIsolation()	Gets this Connection's current transaction isolation level.
java.util.Map<java.lang.String,java.lang.Class<?>>	getTypeMap()	Gets the type map object associated with this connection.
protected java.lang.String	getURL()	Method uses to get the url of this connection.
protected java.lang.String	getUserName()	Method uses to get the user name of this connection.
protected java.lang.String	getVersion()	Method uses to get the version of the database.
protected int	getVersionNum()
java.sql.SQLWarning	getWarnings()	Retrieves the first warning reported by calls on this Connection.
int	hashCode()	Returns a hash code value for the object.
boolean	isClosed()	Checks if the connection is closed.
boolean	isConnectionLost(int timeout_sec)
static boolean	isCriticalError(java.sql.SQLException ex)
boolean	isReadOnly()	Check if the connection is in read-only mode.
boolean	isValid(int _timeout)	Returns true if the connection has not been closed and is still valid.
boolean	isWrapperFor(java.lang.Class<?> iface)	Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does.
java.lang.String	nativeSQL(java.lang.String sql)	Converts the given SQL statement into the system's native SQL grammar.
protected VirtuosoException	notify_error(java.lang.Throwable e)
protected java.util.Vector<VirtuosoConnection.VhostRec>	parse_vhost(java.lang.String vhost, java.lang.String _host, int _port)
java.sql.CallableStatement	prepareCall(java.lang.String sql)	Creates a CallableStatement object to call database stored procedures.
java.sql.CallableStatement	prepareCall(java.lang.String sql, int resultSetType, int resultSetConcurrency)	Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency.
java.sql.CallableStatement	prepareCall(java.lang.String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)	calls checkHoldability and then normal prepareCall
java.sql.PreparedStatement	prepareStatement(java.lang.String sql)	Creates a PreparedStatement object to send parameterized SQL statements to the database.
java.sql.PreparedStatement	prepareStatement(java.lang.String sql, int autoGeneratedKeys)	autoGeneratedKeys ignored
java.sql.PreparedStatement	prepareStatement(java.lang.String sql, int[] columnIndexes)	columnIndexes ignored ignored
java.sql.PreparedStatement	prepareStatement(java.lang.String sql, int resultSetType, int resultSetConcurrency)	Creates a PreparedStatement object that will generate ResultSet objects with the given type and concurrency.
java.sql.PreparedStatement	prepareStatement(java.lang.String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)	Creates a PreparedStatement object that will generate ResultSet objects with the given type, concurrency, and holdability.
java.sql.PreparedStatement	prepareStatement(java.lang.String sql, java.lang.String[] columnNames)	columnNames ignored ignored
protected boolean	read_request()	Method uses to read messages and dispatch them between their future owner.
protected void	recacheStmt(VirtuosoPreparedStatement ps)
void	releaseSavepoint(java.sql.Savepoint savepoint)	Removes the specified Savepoint and subsequent Savepoint objects from the current transaction.
protected void	removeFuture(virtuoso.jdbc4.VirtuosoFuture fut)	Remove a future from the hashtable.
protected void	removeStmtFromClose(VirtuosoStatement obj)
void	rollback()	Drops all changes made since the previous commit/rollback and releases any database locks currently held by this Connection.
void	rollback(java.sql.Savepoint savepoint)	Undoes all changes made after the given Savepoint object was set.
void	setAutoCommit(boolean autoCommit)	Sets this connection's auto-commit mode.
void	setCatalog(java.lang.String catalog)	Sets a catalog name in order to select a subspace of this Connection's database in which to work.
void	setClientInfo(java.lang.String name, java.lang.String value)	Sets the value of the client info property specified by name to the value specified by value.
void	setClientInfo(java.util.Properties properties)	Sets the value of the connection's client info properties.
void	setHoldability(int holdability)	calls checkHoldability
void	setNetworkTimeout(java.util.concurrent.Executor executor, int milliseconds)	Sets the maximum period a Connection or objects created from the Connection will wait for the database to reply to any one request.
void	setReadOnly(boolean readOnly)	Puts this connection in read-only mode.
java.sql.Savepoint	setSavepoint()	Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.
java.sql.Savepoint	setSavepoint(java.lang.String name)	Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.
void	setSchema(java.lang.String schema)	Sets the given schema name to access.
protected void	setSocketTimeout(int timeout)
void	setTransactionIsolation(int level)	Attempts to change the transaction isolation level to the one given.
void	setTypeMap(java.util.Map<java.lang.String,java.lang.Class<?>> map)	Installs the given type map as the type map for this connection.
protected void	setWarning(java.sql.SQLWarning warn)
protected java.lang.String	uncharsetBytes(java.lang.String source)
<T> T	unwrap(java.lang.Class<T> iface)	Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy.
protected void	write_bytes(byte[] bytes)
protected void	write_object(java.lang.Object obj)	Send an object to be sent on the output stream.

Methods inherited from interface java.sql.Connection

setShardingKey, setShardingKey, setShardingKeyIfValid, setShardingKeyIfValid

Methods inherited from class java.lang.Object

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

Field Detail

qualifier

protected java.lang.String qualifier

client_defaults

protected Vector client_defaults

client_charset

protected Vector client_charset

client_charset_hash

protected java.util.Hashtable<java.lang.Character,java.lang.Byte> client_charset_hash

warning

protected java.sql.SQLWarning warning

timeout_def

protected int timeout_def

timeout

protected int timeout

txn_timeout

protected int txn_timeout

fbs

protected int fbs

utf8_execs

protected boolean utf8_execs

timezoneless_datetimes

protected int timezoneless_datetimes

pooled_connection

protected VirtuosoPooledConnection pooled_connection

xa_connection

protected VirtuosoXAConnection xa_connection

charset

protected java.lang.String charset

charset_utf8

protected boolean charset_utf8

rdf_type_hash

protected java.util.Hashtable<java.lang.Integer,java.lang.String> rdf_type_hash

rdf_lang_hash

protected java.util.Hashtable<java.lang.Integer,java.lang.String> rdf_lang_hash

rdf_type_rev

protected java.util.Hashtable<java.lang.String,java.lang.Integer> rdf_type_rev

rdf_lang_rev

protected java.util.Hashtable<java.lang.String,java.lang.Integer> rdf_lang_rev

rdf_type_loaded

protected boolean rdf_type_loaded

rdf_lang_loaded

protected boolean rdf_lang_loaded

Method Detail

parse_vhost

protected java.util.Vector<VirtuosoConnection.VhostRec> parse_vhost(java.lang.String vhost,
                                                                    java.lang.String _host,
                                                                    int _port)
                                                             throws VirtuosoException

Throws:

VirtuosoException

isConnectionLost

public boolean isConnectionLost(int timeout_sec)

getIntAttr

protected int getIntAttr(java.util.Properties info,
                         java.lang.String key,
                         int def)

getBoolAttr

protected boolean getBoolAttr(java.util.Properties info,
                              java.lang.String key,
                              boolean def)

write_object

protected void write_object(java.lang.Object obj)
                     throws java.io.IOException,
                            VirtuosoException

Send an object to be sent on the output stream.

Parameters:

obj - The object to send.

Throws:

VirtuosoException - An internal error occurred.

java.io.IOException - An ioexception occured

write_bytes

protected void write_bytes(byte[] bytes)
                    throws java.io.IOException,
                           VirtuosoException

Throws:

java.io.IOException

VirtuosoException

getFuture

protected virtuoso.jdbc4.VirtuosoFuture getFuture(java.lang.String rpcname,
                                                  java.lang.Object[] args,
                                                  int timeout)
                                           throws java.io.IOException,
                                                  VirtuosoException

Start an RPC function call by sending a VirtuosoFuture request.

Parameters:

rpcname - The name of the RPC function.

args - The array of arguments.

timeout - The timeout for rpc call.

Returns:

VirtuosoFuture The future instance.

Throws:

java.io.IOException - An IO error occurred.

VirtuosoException - An internal error occurred.

clearFutures

protected void clearFutures()

removeFuture

protected void removeFuture(virtuoso.jdbc4.VirtuosoFuture fut)

Remove a future from the hashtable.

Parameters:

fut - The future to remove.

read_request

protected boolean read_request()
                        throws java.io.IOException,
                               VirtuosoException

Method uses to read messages and dispatch them between their future owner.

Returns:

boolean True if a message was dispatching.

Throws:

java.io.IOException - A stream error occurred.

VirtuosoException - An internal error occurred.

getURL

protected java.lang.String getURL()

Method uses to get the url of this connection.

Returns:

String The url.

getUserName

protected java.lang.String getUserName()

Method uses to get the user name of this connection.

Returns:

String The user name.

getQualifierName

protected java.lang.String getQualifierName()

Method uses to get the qualifier name of this connection.

Returns:

String The qualifier name.

getVersion

protected java.lang.String getVersion()

Method uses to get the version of the database.

Returns:

String The version number.

getVersionNum

protected int getVersionNum()

getCase

protected int getCase()

Method uses to get the case.

Returns:

int The case.

getTimeout

protected int getTimeout()

Method uses to get the I/O timeout.

Returns:

int the time out.

clearWarnings

public void clearWarnings()
                   throws VirtuosoException

Clears all the warnings reported on this Connection object. Virtuoso does not generate warnings, so this function does nothing, but we must declare it to be compliant with the JDBC API.

Specified by:

clearWarnings in interface java.sql.Connection

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.clearWarnings()

close

public void close()
           throws VirtuosoException

Close the current connection previously established with Virtuoso DBMS.

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.sql.Connection

Throws:

VirtuosoException - An error occurred during the connection.

See Also:

Connection.close()

commit

public void commit()
            throws VirtuosoException

Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by the Connection. This method should be used only when auto-commit mode has been disabled.

Specified by:

commit in interface java.sql.Connection

Throws:

VirtuosoException - An internal error occurred.

See Also:

Connection.commit()

createStatement

public java.sql.Statement createStatement()
                                   throws VirtuosoException

Creates a Statement object to send SQL statements to the Virtuoso DBMS. SQL statements without parameters are normally executed using Statement objects. If the same SQL statement is executed many times, it is more efficient to use a PreparedStatement. Result sets created using the returned Statement will have forward-only type, and read-only concurrency, by default.

Specified by:

createStatement in interface java.sql.Connection

Returns:

Statement A new Statement object.

Throws:

VirtuosoException - A database access error occurred.

See Also:

Connection.createStatement(), VirtuosoStatement

getAutoCommit

public boolean getAutoCommit()
                      throws VirtuosoException

Returns the current auto-commit state.

Specified by:

getAutoCommit in interface java.sql.Connection

Returns:

boolean The current state of auto-commit mode.

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.setAutoCommit(boolean)

getMetaData

public java.sql.DatabaseMetaData getMetaData()
                                      throws VirtuosoException

Gets the metadata regarding this connection's database. A Connection's database is able to provide information describing its tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on. This information is made available through a DatabaseMetaData object.

Specified by:

getMetaData in interface java.sql.Connection

Returns:

a DatabaseMetaData object for this Connection

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.getMetaData(), VirtuosoDatabaseMetaData

getWarnings

public java.sql.SQLWarning getWarnings()
                                throws VirtuosoException

Retrieves the first warning reported by calls on this Connection. Subsequent Connection warnings will be chained to this SQLWarning. Virtuoso does not generate warnings, so this function returns always null.

Specified by:

getWarnings in interface java.sql.Connection

Returns:

SQLWarning The first SQLWarning or null (must be null for the moment)

Throws:

VirtuosoException - No errors returned (just implementation).

See Also:

Connection.getWarnings()

setTransactionIsolation

public void setTransactionIsolation(int level)
                             throws VirtuosoException

Attempts to change the transaction isolation level to the one given. The constants defined in the interface Connection are the possible transaction isolation levels.

Specified by:

setTransactionIsolation in interface java.sql.Connection

Parameters:

level - one of the TRANSACTION_* isolation values with the exception of TRANSACTION_NONE; some databases may not support other values

Throws:

VirtuosoException - An internal error occurred.

See Also:

Connection.setTransactionIsolation(int)

getTransactionIsolation

public int getTransactionIsolation()
                            throws VirtuosoException

Gets this Connection's current transaction isolation level.

Specified by:

getTransactionIsolation in interface java.sql.Connection

Returns:

the current TRANSACTION_* mode value

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.getTransactionIsolation()

isClosed

public boolean isClosed()

Checks if the connection is closed.

Specified by:

isClosed in interface java.sql.Connection

Returns:

boolean True if the connection is closed, false if it is still open.

prepareCall

public java.sql.CallableStatement prepareCall(java.lang.String sql)
                                       throws VirtuosoException

Creates a CallableStatement object to call database stored procedures. Result sets created using the returned CallableStatement will have forward-only type and read-only concurrency, by default.

Specified by:

prepareCall in interface java.sql.Connection

Parameters:

sql - a SQL statement that may contain one or more '?' parameter placeholders. Typically this statement is a JDBC function call escape string.

Returns:

a new CallableStatement object containing the pre-compiled SQL statement

Throws:

VirtuosoException - An internal error occurred.

See Also:

Connection.prepareCall(java.lang.String), VirtuosoCallableStatement

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql)
                                            throws VirtuosoException

Creates a PreparedStatement object to send parameterized SQL statements to the database. Result sets created using the returned PreparedStatement will have forward-only type and read-only concurrency, by default.

Specified by:

prepareStatement in interface java.sql.Connection

Parameters:

sql - a SQL statement that may contain one or more '?' IN parameter placeholders

Returns:

PreparedStatement A new PreparedStatement object.

Throws:

VirtuosoException - A database access error occurs.

See Also:

Connection.prepareStatement(java.lang.String), VirtuosoPreparedStatement

rollback

public void rollback()
              throws VirtuosoException

Drops all changes made since the previous commit/rollback and releases any database locks currently held by this Connection. This method should be used only when auto-commit has been disabled.

Specified by:

rollback in interface java.sql.Connection

Throws:

VirtuosoException - An internal error occurred.

See Also:

Connection.rollback()

setAutoCommit

public void setAutoCommit(boolean autoCommit)
                   throws VirtuosoException

Sets this connection's auto-commit mode. By default, new connections are in auto-commit mode.

Specified by:

setAutoCommit in interface java.sql.Connection

Parameters:

autoCommit - True enables auto-commit; false disables it.

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.setAutoCommit(boolean)

createStatement

public java.sql.Statement createStatement(int resultSetType,
                                          int resultSetConcurrency)
                                   throws VirtuosoException

Creates a Statement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the createStatement method above, but it allows the default result set type and result set concurrency type to be overridden.

Specified by:

createStatement in interface java.sql.Connection

Parameters:

resultSetType - A result set type; see VirtuosoResultSet.TYPE_XXX

resultSetConcurrency - A concurrency type; see VirtuosoResultSet.CONCUR_XXX

Returns:

Statement A new Statement object.

Throws:

VirtuosoException - A database access error occurs.

See Also:

Connection.createStatement(), VirtuosoStatement

prepareCall

public java.sql.CallableStatement prepareCall(java.lang.String sql,
                                              int resultSetType,
                                              int resultSetConcurrency)
                                       throws VirtuosoException

Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the createStatement method above, but it allows the default result set type and result set concurrency type to be overridden.

Specified by:

prepareCall in interface java.sql.Connection

Parameters:

resultSetType - a result set type; see VirtuosoResultSet.TYPE_XXX

resultSetConcurrency - a concurrency type; see VirtuosoResultSet.CONCUR_XXX

Returns:

a new CallableStatement object containing the pre-compiled SQL statement

Throws:

VirtuosoException - A database access error occurs.

See Also:

Connection.prepareCall(java.lang.String), VirtuosoCallableStatement

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql,
                                                   int resultSetType,
                                                   int resultSetConcurrency)
                                            throws VirtuosoException

Creates a PreparedStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the prepareStatement method above, but it allows the default result set type and result set concurrency type to be overridden.

Specified by:

prepareStatement in interface java.sql.Connection

Parameters:

sql - a SQL statement that may contain one or more '?' IN parameter placeholders

resultSetType - a result set type; see VirtuosoResultSet.TYPE_XXX

resultSetConcurrency - a concurrency type; see VirtuosoResultSet.CONCUR_XXX

Returns:

a new CallableStatement object containing the pre-compiled SQL statement

Throws:

VirtuosoException - A database access error occurs.

See Also:

Connection.prepareCall(java.lang.String), VirtuosoPreparedStatement

hashCode

public int hashCode()

Returns a hash code value for the object.

Overrides:

hashCode in class java.lang.Object

Returns:

int The hash code value.

finalize

public void finalize()
              throws java.lang.Throwable

Method runs when the garbage collector want to erase the object

Overrides:

finalize in class java.lang.Object

Throws:

java.lang.Throwable

isReadOnly

public boolean isReadOnly()
                   throws VirtuosoException

Check if the connection is in read-only mode.

Specified by:

isReadOnly in interface java.sql.Connection

Returns:

boolean True if connection is read-only and false otherwise.

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.isReadOnly()

setReadOnly

public void setReadOnly(boolean readOnly)
                 throws VirtuosoException

Puts this connection in read-only mode.

Specified by:

setReadOnly in interface java.sql.Connection

Parameters:

readOnly - True enables read-only mode; false disables it.

Throws:

VirtuosoException - An internal error occurred.

See Also:

Connection.setReadOnly(boolean)

nativeSQL

public java.lang.String nativeSQL(java.lang.String sql)
                           throws VirtuosoException

Converts the given SQL statement into the system's native SQL grammar. A driver may convert the JDBC sql grammar into its system's native SQL grammar prior to sending it; this method returns the native form of the statement that the driver would have sent.

Specified by:

nativeSQL in interface java.sql.Connection

Parameters:

sql - a SQL statement that may contain one or more '?' parameter placeholders

Returns:

the native form of this statement

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.nativeSQL(java.lang.String)

setCatalog

public void setCatalog(java.lang.String catalog)
                throws VirtuosoException

Sets a catalog name in order to select a subspace of this Connection's database in which to work. If the driver does not support catalogs, it will silently ignore this request.

Specified by:

setCatalog in interface java.sql.Connection

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.setCatalog(java.lang.String)

getCatalog

public java.lang.String getCatalog()
                            throws VirtuosoException

Returns the Connection's current catalog name.

Specified by:

getCatalog in interface java.sql.Connection

Returns:

the current catalog name or null

Throws:

VirtuosoException - No errors returned (just an implementation question).

See Also:

Connection.getCatalog()

getTypeMap

public java.util.Map<java.lang.String,java.lang.Class<?>> getTypeMap()
                                                              throws VirtuosoException

Gets the type map object associated with this connection. Unless the application has added an entry to the type map, the map returned will be empty.

Specified by:

getTypeMap in interface java.sql.Connection

Returns:

the java.util.Map object associated with this Connection object

Throws:

VirtuosoException - No errors returned (just implementation).

See Also:

Connection.getTypeMap()

setTypeMap

public void setTypeMap(java.util.Map<java.lang.String,java.lang.Class<?>> map)
                throws VirtuosoException

Installs the given type map as the type map for this connection. The type map will be used for the custom mapping of SQL structured types and distinct types.

Specified by:

setTypeMap in interface java.sql.Connection

Parameters:

map - java.util.Map object to install as the replacement for this Connection object's default type map

Throws:

VirtuosoException - No errors returned (just implementation).

See Also:

Connection.setTypeMap(java.util.Map<java.lang.String, java.lang.Class<?>>)

setSocketTimeout

protected void setSocketTimeout(int timeout)
                         throws VirtuosoException

Throws:

VirtuosoException

escapeSQL

protected VirtuosoExplicitString escapeSQL(java.lang.String sql)
                                    throws VirtuosoException

Throws:

VirtuosoException

escapeSQLString

protected VirtuosoExplicitString escapeSQLString(java.lang.String sql)
                                          throws VirtuosoException

Throws:

VirtuosoException

charsetBytes1

protected byte[] charsetBytes1(java.lang.String source,
                               java.lang.String from,
                               java.lang.String to)
                        throws VirtuosoException

Throws:

VirtuosoException

charsetBytes

protected byte[] charsetBytes(java.lang.String source)
                       throws VirtuosoException

Throws:

VirtuosoException

uncharsetBytes

protected java.lang.String uncharsetBytes(java.lang.String source)
                                   throws VirtuosoException

Throws:

VirtuosoException

checkHoldability

protected void checkHoldability(int holdability)
                         throws java.sql.SQLException

supports only ResultSet.HOLD_CURSORS_OVER_COMMIT for now

Parameters:

holdability - a ResultSet holdability constant; one of ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT

Throws:

VirtuosoException - if the holdability is not the supported one

java.sql.SQLException

setHoldability

public void setHoldability(int holdability)
                    throws java.sql.SQLException

calls checkHoldability

Specified by:

setHoldability in interface java.sql.Connection

Parameters:

holdability - a ResultSet holdability constant; one of ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT

Throws:

java.sql.SQLException

See Also:

checkHoldability(int)

getHoldability

public int getHoldability()
                   throws java.sql.SQLException

Retrieves the current holdability of ResultSet objects created using this Connection object.

Specified by:

getHoldability in interface java.sql.Connection

Returns:

the holdability, one of ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT

Throws:

java.sql.SQLException - if a database access error occurs or this method is called on a closed connection

Since:

1.4

See Also:

setHoldability(int), DatabaseMetaData.getResultSetHoldability(), ResultSet

setSavepoint

public java.sql.Savepoint setSavepoint()
                                throws java.sql.SQLException

Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.

Specified by:

setSavepoint in interface java.sql.Connection

Returns:

the new Savepoint object

Throws:

VirtuosoException - allways thrown : savepoints not supported

java.sql.SQLException

setSavepoint

public java.sql.Savepoint setSavepoint(java.lang.String name)
                                throws java.sql.SQLException

Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.

Specified by:

setSavepoint in interface java.sql.Connection

Parameters:

name - a String containing the name of the savepoint

Returns:

the new Savepoint object

Throws:

VirtuosoException - allways thrown : savepoints not supported

java.sql.SQLException

rollback

public void rollback(java.sql.Savepoint savepoint)
              throws java.sql.SQLException

Undoes all changes made after the given Savepoint object was set.

This method should be used only when auto-commit has been disabled.

Specified by:

rollback in interface java.sql.Connection

Parameters:

savepoint - the Savepoint object to roll back to

Throws:

VirtuosoException - allways thrown : savepoints not supported

java.sql.SQLException

releaseSavepoint

public void releaseSavepoint(java.sql.Savepoint savepoint)
                      throws java.sql.SQLException

Removes the specified Savepoint and subsequent Savepoint objects from the current transaction. Any reference to the savepoint after it have been removed will cause an SQLException to be thrown.

Specified by:

releaseSavepoint in interface java.sql.Connection

Parameters:

savepoint - the Savepoint object to be removed

Throws:

VirtuosoException - allways thrown : savepoints not supported

java.sql.SQLException

createStatement

public java.sql.Statement createStatement(int resultSetType,
                                          int resultSetConcurrency,
                                          int resultSetHoldability)
                                   throws java.sql.SQLException

Creates a Statement object that will generate ResultSet objects with the given type, concurrency, and holdability. This method is the same as the createStatement method above, but it allows the default result set type, concurrency, and holdability to be overridden. Calls checkHoldability and then normal createStatement

Specified by:

createStatement in interface java.sql.Connection

Parameters:

resultSetType - one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE

resultSetConcurrency - one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE

resultSetHoldability - one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT

Returns:

a new Statement object that will generate ResultSet objects with the given type, concurrency, and holdability

Throws:

java.sql.SQLException - if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type, concurrency, and holdability

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this method or this method is not supported for the specified result set type, result set holdability and result set concurrency.

See Also:

checkHoldability(int)

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql,
                                                   int resultSetType,
                                                   int resultSetConcurrency,
                                                   int resultSetHoldability)
                                            throws java.sql.SQLException

Creates a PreparedStatement object that will generate ResultSet objects with the given type, concurrency, and holdability.

This method is the same as the prepareStatement method above, but it allows the default result set type, concurrency, and holdability to be overridden. Calls checkHoldability and then normal prepareStatement

Specified by:

prepareStatement in interface java.sql.Connection

Parameters:

sql - a String object that is the SQL statement to be sent to the database; may contain one or more '?' IN parameters

resultSetType - one of the following ResultSet constants: ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE

resultSetConcurrency - one of the following ResultSet constants: ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE

resultSetHoldability - one of the following ResultSet constants: ResultSet.HOLD_CURSORS_OVER_COMMIT or ResultSet.CLOSE_CURSORS_AT_COMMIT

Returns:

a new PreparedStatement object, containing the pre-compiled SQL statement, that will generate ResultSet objects with the given type, concurrency, and holdability

Throws:

java.sql.SQLException - if a database access error occurs, this method is called on a closed connection or the given parameters are not ResultSet constants indicating type, concurrency, and holdability

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this method or this method is not supported for the specified result set type, result set holdability and result set concurrency.

See Also:

checkHoldability(int)

prepareCall

public java.sql.CallableStatement prepareCall(java.lang.String sql,
                                              int resultSetType,
                                              int resultSetConcurrency,
                                              int resultSetHoldability)
                                       throws java.sql.SQLException

calls checkHoldability and then normal prepareCall

Specified by:

prepareCall in interface java.sql.Connection

Throws:

java.sql.SQLException

See Also:

checkHoldability(int)

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql,
                                                   int autoGeneratedKeys)
                                            throws java.sql.SQLException

autoGeneratedKeys ignored

Specified by:

prepareStatement in interface java.sql.Connection

Throws:

java.sql.SQLException

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql,
                                                   int[] columnIndexes)
                                            throws java.sql.SQLException

columnIndexes ignored ignored

Specified by:

prepareStatement in interface java.sql.Connection

Throws:

java.sql.SQLException

prepareStatement

public java.sql.PreparedStatement prepareStatement(java.lang.String sql,
                                                   java.lang.String[] columnNames)
                                            throws java.sql.SQLException

columnNames ignored ignored

Specified by:

prepareStatement in interface java.sql.Connection

Throws:

java.sql.SQLException

createClob

public java.sql.Clob createClob()
                         throws java.sql.SQLException

Constructs an object that implements the Clob interface. The object returned initially contains no data. The setAsciiStream, setCharacterStream and setString methods of the Clob interface may be used to add data to the Clob.

Specified by:

createClob in interface java.sql.Connection

Returns:

An object that implements the Clob interface

Throws:

java.sql.SQLException - if an object that implements the Clob interface cannot be constructed, this method is called on a closed connection or a database access error occurs.

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this data type

Since:

1.6

createBlob

public java.sql.Blob createBlob()
                         throws java.sql.SQLException

Constructs an object that implements the Blob interface. The object returned initially contains no data. The setBinaryStream and setBytes methods of the Blob interface may be used to add data to the Blob.

Specified by:

createBlob in interface java.sql.Connection

Returns:

An object that implements the Blob interface

Throws:

java.sql.SQLException - if an object that implements the Blob interface cannot be constructed, this method is called on a closed connection or a database access error occurs.

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this data type

Since:

1.6

createNClob

public java.sql.NClob createNClob()
                           throws java.sql.SQLException

Constructs an object that implements the NClob interface. The object returned initially contains no data. The setAsciiStream, setCharacterStream and setString methods of the NClob interface may be used to add data to the NClob.

Specified by:

createNClob in interface java.sql.Connection

Returns:

An object that implements the NClob interface

Throws:

java.sql.SQLException - if an object that implements the NClob interface cannot be constructed, this method is called on a closed connection or a database access error occurs.

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this data type

Since:

1.6

createSQLXML

public java.sql.SQLXML createSQLXML()
                             throws java.sql.SQLException

Constructs an object that implements the SQLXML interface. The object returned initially contains no data. The createXmlStreamWriter object and setString method of the SQLXML interface may be used to add data to the SQLXML object.

Specified by:

createSQLXML in interface java.sql.Connection

Returns:

An object that implements the SQLXML interface

Throws:

java.sql.SQLException - if an object that implements the SQLXML interface cannot be constructed, this method is called on a closed connection or a database access error occurs.

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this data type

Since:

1.6

isValid

public boolean isValid(int _timeout)
                throws java.sql.SQLException

Returns true if the connection has not been closed and is still valid. The driver shall submit a query on the connection or use some other mechanism that positively verifies the connection is still valid when this method is called.

The query submitted by the driver to validate the connection shall be executed in the context of the current transaction.

Specified by:

isValid in interface java.sql.Connection

Parameters:

_timeout - - The time in seconds to wait for the database operation used to validate the connection to complete. If the timeout period expires before the operation completes, this method returns false. A value of 0 indicates a timeout is not applied to the database operation.

Returns:

true if the connection is valid, false otherwise

Throws:

java.sql.SQLException - if the value supplied for timeout is less then 0

Since:

1.6

See Also:

DatabaseMetaData.getClientInfoProperties()

setClientInfo

public void setClientInfo(java.lang.String name,
                          java.lang.String value)
                   throws java.sql.SQLClientInfoException

Sets the value of the client info property specified by name to the value specified by value.

Applications may use the DatabaseMetaData.getClientInfoProperties method to determine the client info properties supported by the driver and the maximum length that may be specified for each property.

The driver stores the value specified in a suitable location in the database. For example in a special register, session parameter, or system table column. For efficiency the driver may defer setting the value in the database until the next time a statement is executed or prepared. Other than storing the client information in the appropriate place in the database, these methods shall not alter the behavior of the connection in anyway. The values supplied to these methods are used for accounting, diagnostics and debugging purposes only.

The driver shall generate a warning if the client info name specified is not recognized by the driver.

If the value specified to this method is greater than the maximum length for the property the driver may either truncate the value and generate a warning or generate a SQLClientInfoException. If the driver generates a SQLClientInfoException, the value specified was not set on the connection.

The following are standard client info properties. Drivers are not required to support these properties however if the driver supports a client info property that can be described by one of the standard properties, the standard property name should be used.

• ApplicationName - The name of the application currently utilizing the connection
• ClientUser - The name of the user that the application using the connection is performing work for. This may not be the same as the user name that was used in establishing the connection.
• ClientHostname - The hostname of the computer the application using the connection is running on.

Specified by:

setClientInfo in interface java.sql.Connection

Parameters:

name - The name of the client info property to set

value - The value to set the client info property to. If the value is null, the current value of the specified property is cleared.

Throws:

java.sql.SQLClientInfoException - if the database server returns an error while setting the client info value on the database server or this method is called on a closed connection

Since:

1.6

setClientInfo

public void setClientInfo(java.util.Properties properties)
                   throws java.sql.SQLClientInfoException

Sets the value of the connection's client info properties. The Properties object contains the names and values of the client info properties to be set. The set of client info properties contained in the properties list replaces the current set of client info properties on the connection. If a property that is currently set on the connection is not present in the properties list, that property is cleared. Specifying an empty properties list will clear all of the properties on the connection. See setClientInfo (String, String) for more information.

If an error occurs in setting any of the client info properties, a SQLClientInfoException is thrown. The SQLClientInfoException contains information indicating which client info properties were not set. The state of the client information is unknown because some databases do not allow multiple client info properties to be set atomically. For those databases, one or more properties may have been set before the error occurred.

Specified by:

setClientInfo in interface java.sql.Connection

Parameters:

properties - the list of client info properties to set

Throws:

java.sql.SQLClientInfoException - if the database server returns an error while setting the clientInfo values on the database server or this method is called on a closed connection

Since:

1.6

See Also:

setClientInfo(String, String)

getClientInfo

public java.lang.String getClientInfo(java.lang.String name)
                               throws java.sql.SQLException

Returns the value of the client info property specified by name. This method may return null if the specified client info property has not been set and does not have a default value. This method will also return null if the specified client info property name is not supported by the driver.

Applications may use the DatabaseMetaData.getClientInfoProperties method to determine the client info properties supported by the driver.

Specified by:

getClientInfo in interface java.sql.Connection

Parameters:

name - The name of the client info property to retrieve

Returns:

The value of the client info property specified

Throws:

java.sql.SQLException - if the database server returns an error when fetching the client info value from the database or this method is called on a closed connection

Since:

1.6

See Also:

DatabaseMetaData.getClientInfoProperties()

getClientInfo

public java.util.Properties getClientInfo()
                                   throws java.sql.SQLException

Returns a list containing the name and current value of each client info property supported by the driver. The value of a client info property may be null if the property has not been set and does not have a default value.

Specified by:

getClientInfo in interface java.sql.Connection

Returns:

A Properties object that contains the name and current value of each of the client info properties supported by the driver.

Throws:

java.sql.SQLException - if the database server returns an error when fetching the client info values from the database or this method is called on a closed connection

Since:

1.6

createArrayOf

public java.sql.Array createArrayOf(java.lang.String typeName,
                                    java.lang.Object[] elements)
                             throws java.sql.SQLException

Factory method for creating Array objects.

Note: When createArrayOf is used to create an array object that maps to a primitive data type, then it is implementation-defined whether the Array object is an array of that primitive data type or an array of Object.

Note: The JDBC driver is responsible for mapping the elements Object array to the default JDBC SQL type defined in java.sql.Types for the given class of Object. The default mapping is specified in Appendix B of the JDBC specification. If the resulting JDBC type is not the appropriate type for the given typeName then it is implementation defined whether an SQLException is thrown or the driver supports the resulting conversion.

Specified by:

createArrayOf in interface java.sql.Connection

Parameters:

typeName - the SQL name of the type the elements of the array map to. The typeName is a database-specific name which may be the name of a built-in type, a user-defined type or a standard SQL type supported by this database. This is the value returned by Array.getBaseTypeName

elements - the elements that populate the returned object

Returns:

an Array object whose elements map to the specified SQL type

Throws:

java.sql.SQLException - if a database error occurs, the JDBC type is not appropriate for the typeName and the conversion is not supported, the typeName is null or this method is called on a closed connection

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this data type

Since:

1.6

createStruct

public java.sql.Struct createStruct(java.lang.String typeName,
                                    java.lang.Object[] attributes)
                             throws java.sql.SQLException

Factory method for creating Struct objects.

Specified by:

createStruct in interface java.sql.Connection

Parameters:

typeName - the SQL type name of the SQL structured type that this Struct object maps to. The typeName is the name of a user-defined type that has been defined for this database. It is the value returned by Struct.getSQLTypeName.

attributes - the attributes that populate the returned object

Returns:

a Struct object that maps to the given SQL type and is populated with the given attributes

Throws:

java.sql.SQLException - if a database error occurs, the typeName is null or this method is called on a closed connection

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this data type

Since:

1.6

unwrap

public <T> T unwrap(java.lang.Class<T> iface)
             throws java.sql.SQLException

Returns an object that implements the given interface to allow access to non-standard methods, or standard methods not exposed by the proxy. If the receiver implements the interface then the result is the receiver or a proxy for the receiver. If the receiver is a wrapper and the wrapped object implements the interface then the result is the wrapped object or a proxy for the wrapped object. Otherwise return the the result of calling unwrap recursively on the wrapped object or a proxy for that result. If the receiver is not a wrapper and does not implement the interface, then an SQLException is thrown.

Specified by:

unwrap in interface java.sql.Wrapper

Parameters:

iface - A Class defining an interface that the result must implement.

Returns:

an object that implements the interface. May be a proxy for the actual implementing object.

Throws:

java.sql.SQLException - If no object found that implements the interface

Since:

1.6

isWrapperFor

public boolean isWrapperFor(java.lang.Class<?> iface)
                     throws java.sql.SQLException

Returns true if this either implements the interface argument or is directly or indirectly a wrapper for an object that does. Returns false otherwise. If this implements the interface then return true, else if this is a wrapper then return the result of recursively calling isWrapperFor on the wrapped object. If this does not implement the interface and is not a wrapper, return false. This method should be implemented as a low-cost operation compared to unwrap so that callers can use this method to avoid expensive unwrap calls that may fail. If this method returns true then calling unwrap with the same argument should succeed.

Specified by:

isWrapperFor in interface java.sql.Wrapper

Parameters:

iface - a Class defining an interface.

Returns:

true if this implements the interface or directly or indirectly wraps an object that does.

Throws:

java.sql.SQLException - if an error occurs while determining whether this is a wrapper for an object with the given interface.

Since:

1.6

setSchema

public void setSchema(java.lang.String schema)
               throws java.sql.SQLException

Sets the given schema name to access.

If the driver does not support schemas, it will silently ignore this request.

Calling setSchema has no effect on previously created or prepared Statement objects. It is implementation defined whether a DBMS prepare operation takes place immediately when the Connection method prepareStatement or prepareCall is invoked. For maximum portability, setSchema should be called before a Statement is created or prepared.

Specified by:

setSchema in interface java.sql.Connection

Parameters:

schema - the name of a schema in which to work

Throws:

java.sql.SQLException - if a database access error occurs or this method is called on a closed connection

Since:

1.7

See Also:

getSchema()

getSchema

public java.lang.String getSchema()
                           throws java.sql.SQLException

Retrieves this Connection object's current schema name.

Specified by:

getSchema in interface java.sql.Connection

Returns:

the current schema name or null if there is none

Throws:

java.sql.SQLException - if a database access error occurs or this method is called on a closed connection

Since:

1.7

See Also:

setSchema(java.lang.String)

abort

public void abort(java.util.concurrent.Executor executor)
           throws java.sql.SQLException

Terminates an open connection. Calling abort results in:

• The connection marked as closed
• Closes any physical connection to the database
• Releases resources used by the connection
• Insures that any thread that is currently accessing the connection will either progress to completion or throw an SQLException.

Calling abort marks the connection closed and releases any resources. Calling abort on a closed connection is a no-op.

It is possible that the aborting and releasing of the resources that are held by the connection can take an extended period of time. When the abort method returns, the connection will have been marked as closed and the Executor that was passed as a parameter to abort may still be executing tasks to release resources.

This method checks to see that there is an SQLPermission object before allowing the method to proceed. If a SecurityManager exists and its checkPermission method denies calling abort, this method throws a java.lang.SecurityException.

Specified by:

abort in interface java.sql.Connection

Parameters:

executor - The Executor implementation which will be used by abort.

Throws:

java.sql.SQLException - if a database access error occurs or the executor is null,

java.lang.SecurityException - if a security manager exists and its checkPermission method denies calling abort

Since:

1.7

See Also:

SecurityManager.checkPermission(java.security.Permission), Executor

setNetworkTimeout

public void setNetworkTimeout(java.util.concurrent.Executor executor,
                              int milliseconds)
                       throws java.sql.SQLException

Sets the maximum period a Connection or objects created from the Connection will wait for the database to reply to any one request. If any request remains unanswered, the waiting method will return with a SQLException, and the Connection or objects created from the Connection will be marked as closed. Any subsequent use of the objects, with the exception of the close, isClosed or Connection.isValid methods, will result in a SQLException.

Note: This method is intended to address a rare but serious condition where network partitions can cause threads issuing JDBC calls to hang uninterruptedly in socket reads, until the OS TCP-TIMEOUT (typically 10 minutes). This method is related to the abort() method which provides an administrator thread a means to free any such threads in cases where the JDBC connection is accessible to the administrator thread. The setNetworkTimeout method will cover cases where there is no administrator thread, or it has no access to the connection. This method is severe in it is effects, and should be given a high enough value so it is never triggered before any more normal timeouts, such as transaction timeouts.

JDBC driver implementations may also choose to support the setNetworkTimeout method to impose a limit on database response time, in environments where no network is present.

Drivers may internally implement some or all of their API calls with multiple internal driver-database transmissions, and it is left to the driver implementation to determine whether the limit will be applied always to the response to the API call, or to any single request made during the API call.

This method can be invoked more than once, such as to set a limit for an area of JDBC code, and to reset to the default on exit from this area. Invocation of this method has no impact on already outstanding requests.

The Statement.setQueryTimeout() timeout value is independent of the timeout value specified in setNetworkTimeout. If the query timeout expires before the network timeout then the statement execution will be canceled. If the network is still active the result will be that both the statement and connection are still usable. However if the network timeout expires before the query timeout or if the statement timeout fails due to network problems, the connection will be marked as closed, any resources held by the connection will be released and both the connection and statement will be unusable.

When the driver determines that the setNetworkTimeout timeout value has expired, the JDBC driver marks the connection closed and releases any resources held by the connection.

This method checks to see that there is an SQLPermission object before allowing the method to proceed. If a SecurityManager exists and its checkPermission method denies calling setNetworkTimeout, this method throws a java.lang.SecurityException.

Specified by:

setNetworkTimeout in interface java.sql.Connection

Parameters:

executor - The Executor implementation which will be used by setNetworkTimeout.

milliseconds - The time in milliseconds to wait for the database operation to complete. If the JDBC driver does not support milliseconds, the JDBC driver will round the value up to the nearest second. If the timeout period expires before the operation completes, a SQLException will be thrown. A value of 0 indicates that there is not timeout for database operations.

Throws:

java.sql.SQLException - if a database access error occurs, this method is called on a closed connection, the executor is null, or the value specified for seconds is less than 0.

java.lang.SecurityException - if a security manager exists and its checkPermission method denies calling setNetworkTimeout.

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this method

Since:

1.7

See Also:

SecurityManager.checkPermission(java.security.Permission), Statement.setQueryTimeout(int), getNetworkTimeout(), abort(java.util.concurrent.Executor), Executor

getNetworkTimeout

public int getNetworkTimeout()
                      throws java.sql.SQLException

Retrieves the number of milliseconds the driver will wait for a database request to complete. If the limit is exceeded, a SQLException is thrown.

Specified by:

getNetworkTimeout in interface java.sql.Connection

Returns:

the current timeout limit in milliseconds; zero means there is no limit

Throws:

java.sql.SQLException - if a database access error occurs or this method is called on a closed Connection

java.sql.SQLFeatureNotSupportedException - if the JDBC driver does not support this method

Since:

1.7

See Also:

setNetworkTimeout(java.util.concurrent.Executor, int)

beginRequest

public void beginRequest()
                  throws java.sql.SQLException

Hints to the driver that a request, an independent unit of work, is beginning on this connection. Each request is independent of all other requests with regard to state local to the connection either on the client or the server. Work done between beginRequest, endRequest pairs does not depend on any other work done on the connection either as part of another request or outside of any request. A request may include multiple transactions. There may be dependencies on committed database state as that is not local to the connection.

Local state is defined as any state associated with a Connection that is local to the current Connection either in the client or the database that is not transparently reproducible.

Calls to beginRequest and endRequest are not nested. Multiple calls to beginRequest without an intervening call to endRequest is not an error. The first beginRequest call marks the start of the request and subsequent calls are treated as a no-op

Use of beginRequest and endRequest is optional, vendor specific and should largely be transparent. In particular implementations may detect conditions that indicate dependence on other work such as an open transaction. It is recommended though not required that implementations throw a SQLException if there is an active transaction and beginRequest is called. Using these methods may improve performance or provide other benefits. Consult your vendors documentation for additional information.

It is recommended to enclose each unit of work in beginRequest, endRequest pairs such that there is no open transaction at the beginning or end of the request and no dependency on local state that crosses request boundaries. Committed database state is not local. implSpec The default implementation is a no-op. apiNote This method is to be used by Connection pooling managers.

The pooling manager should call beginRequest on the underlying connection prior to returning a connection to the caller.

The pooling manager does not need to call beginRequest if:

• The connection pool caches PooledConnection objects
• Returns a logical connection handle when getConnection is called by the application
• The logical Connection is closed by calling Connection.close prior to returning the PooledConnection to the cache.

Specified by:

beginRequest in interface java.sql.Connection

Throws:

java.sql.SQLException - if an error occurs

Since:

9

See Also:

endRequest(), PooledConnection

endRequest

public void endRequest()
                throws java.sql.SQLException

Hints to the driver that a request, an independent unit of work, has completed. Calls to beginRequest and endRequest are not nested. Multiple calls to endRequest without an intervening call to beginRequest is not an error. The first endRequest call marks the request completed and subsequent calls are treated as a no-op. If endRequest is called without an initial call to beginRequest is a no-op.

The exact behavior of this method is vendor specific. In particular implementations may detect conditions that indicate dependence on other work such as an open transaction. It is recommended though not required that implementations throw a SQLException if there is an active transaction and endRequest is called. implSpec The default implementation is a no-op. apiNote This method is to be used by Connection pooling managers.

The pooling manager should call endRequest on the underlying connection when the applications returns the connection back to the connection pool.

The pooling manager does not need to call endRequest if:

• The connection pool caches PooledConnection objects
• Returns a logical connection handle when getConnection is called by the application
• The logical Connection is closed by calling Connection.close prior to returning the PooledConnection to the cache.

Specified by:

endRequest in interface java.sql.Connection

Throws:

java.sql.SQLException - if an error occurs

Since:

9

See Also:

beginRequest(), PooledConnection

addStmtToClose

protected void addStmtToClose(VirtuosoStatement obj)

removeStmtFromClose

protected void removeStmtFromClose(VirtuosoStatement obj)

recacheStmt

protected void recacheStmt(VirtuosoPreparedStatement ps)
                    throws java.sql.SQLException

Throws:

java.sql.SQLException

setWarning

protected void setWarning(java.sql.SQLWarning warn)

notify_error

protected VirtuosoException notify_error(java.lang.Throwable e)

isCriticalError

public static boolean isCriticalError(java.sql.SQLException ex)