Package nl.cwi.monetdb.embedded.jdbc

Class EmbeddedConnection

java.lang.Object

nl.cwi.monetdb.jdbc.MonetWrapper

nl.cwi.monetdb.jdbc.MonetConnection

nl.cwi.monetdb.embedded.jdbc.EmbeddedConnection

All Implemented Interfaces:

AutoCloseable, Connection, Wrapper

public final class EmbeddedConnection
extends nl.cwi.monetdb.jdbc.MonetConnection

A Connection suitable for the MonetDB database using an embedded connection.

Author:

Pedro Ferreira

Nested Class Summary

Nested classes/interfaces inherited from class nl.cwi.monetdb.jdbc.MonetConnection

nl.cwi.monetdb.jdbc.MonetConnection.ResponseList

Field Summary

Fields inherited from class nl.cwi.monetdb.jdbc.MonetConnection

conn_props, hash, language, lastSetQueryTimeout, protocol

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Constructor Summary

Constructors

Constructor	Description
EmbeddedConnection(Properties props, String hash, String language, String directory)
EmbeddedConnection(Properties props, String hash, String language, String directory, Boolean silentFlag, Boolean sequentialFlag)

Method Summary

Modifier and Type	Method	Description
void	closeUnderlyingConnection()	Closes the underlying connection implementation.
List<String>	connect(String user, String pass)	Connects to the existing database on the JVM process.
protected boolean	executeNextQueryBatch(nl.cwi.monetdb.jdbc.MonetStatement statement, List<String> batch, int[] counts, BatchUpdateException e)	Execute a batch query in an embedded connection.
MonetDBEmbeddedConnection	getAsMonetDBEmbeddedConnection()	Makes a conversion of this connection as a MonetDBEmbeddedConnection instance, making it possible to access the MonetDBEmbeddedConnection API on a JDBC embedded connection, although that API doesn't follow the JDBC specification.
int	getBlockSize()	Gets the underlying connection block size length.
int	getDefFetchsize()	Gets the underlying connection default fetch size for DataBlock responses.
String	getDirectory()	Gets the directory where the database is hosted.
String	getJDBCURL()	Gets the underlying connection JDBC String URL.
int	getSoTimeout()	In a embedded connection there is no timeout, so this methods always adds a SQLWarning and returns -1.
int	initialStringBuilderSize()
boolean	isRunningInMemory()	Is the connection running in memory?
boolean	isSequentialFlag()	Is the sequential flag set?
boolean	isSilentFlag()	Is the silent flag set?
void	sendControlCommand(int commandID, int data)	Sends a control command to the server.
void	setSoTimeout(int timeout)	In a embedded connection there is no timeout, so this methods always adds a SQLWarning and the timeout parameter is ignored.

Methods inherited from class nl.cwi.monetdb.jdbc.MonetConnection

abort, clearWarnings, close, commit, createArrayOf, createBlob, createClob, createNClob, createSQLXML, createStatement, createStatement, createStatement, createStruct, finalize, getAutoCommit, getCatalog, getClientInfo, getClientInfo, getHoldability, getLanguage, getMetaData, getNetworkTimeout, getProtocol, getSchema, getSeqCounter, getTransactionIsolation, getTypeMap, getWarnings, isClosed, isEmbedded, isReadOnly, isValid, mapBlobAsVarBinary, mapClobAsVarChar, nativeSQL, prepareCall, prepareCall, prepareCall, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, prepareStatement, releaseSavepoint, rollback, rollback, setAutoCommit, setCatalog, setClientInfo, setClientInfo, setHoldability, setNetworkTimeout, setReadOnly, setSavepoint, setSavepoint, setSchema, setTransactionIsolation, setTypeMap, toString

Methods inherited from class nl.cwi.monetdb.jdbc.MonetWrapper

isWrapperFor, unwrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.sql.Connection

beginRequest, endRequest, setShardingKey, setShardingKey, setShardingKeyIfValid, setShardingKeyIfValid

Methods inherited from interface java.sql.Wrapper

isWrapperFor, unwrap

Constructor Details

EmbeddedConnection

public EmbeddedConnection(Properties props, String hash, String language, String directory)

EmbeddedConnection

public EmbeddedConnection(Properties props, String hash, String language, String directory, Boolean silentFlag, Boolean sequentialFlag)

Method Details

getDirectory

public String getDirectory()

Gets the directory where the database is hosted. Null pointer means is running in-memory.

Returns:

The directory where the database is hosted. Null pointer means is running in-memory

isRunningInMemory

public boolean isRunningInMemory()

Is the connection running in memory?

Returns:

Is the connection running in memory?

isSilentFlag

public boolean isSilentFlag()

Is the silent flag set?

Returns:

Is the silent flag set?

isSequentialFlag

public boolean isSequentialFlag()

Is the sequential flag set?

Returns:

Is the sequential flag set?

getAsMonetDBEmbeddedConnection

public MonetDBEmbeddedConnection getAsMonetDBEmbeddedConnection()

Makes a conversion of this connection as a MonetDBEmbeddedConnection instance, making it possible to access the MonetDBEmbeddedConnection API on a JDBC embedded connection, although that API doesn't follow the JDBC specification.

Returns:

This connection as a MonetDBEmbeddedConnection instance

connect

public List<String> connect(String user, String pass) throws IOException, nl.cwi.monetdb.mcl.protocol.ProtocolException, nl.cwi.monetdb.mcl.connection.MCLException

Connects to the existing database on the JVM process. If the database is not running, then it will start. However if the database is already running in a different directory, a MCLException will be thrown.
At this moment, no user authentication is performed in an embedded connection, hence the username and password parameters can be ignored.

Specified by:

connect in class nl.cwi.monetdb.jdbc.MonetConnection

Parameters:

user - The user name to authenticate (ignored)

pass - The user's password (ignored)

Returns:

Always a null list

Throws:

nl.cwi.monetdb.mcl.connection.MCLException - If the database is already running in a different directory

IOException

nl.cwi.monetdb.mcl.protocol.ProtocolException

getJDBCURL

public String getJDBCURL()

Gets the underlying connection JDBC String URL.

Specified by:

getJDBCURL in class nl.cwi.monetdb.jdbc.MonetConnection

Returns:

The underlying connection JDBC String URL

getBlockSize

public int getBlockSize()

Gets the underlying connection block size length. On an embedded connection, there is no boundary restrictions, so we always return the integer max value.

Specified by:

getBlockSize in class nl.cwi.monetdb.jdbc.MonetConnection

Returns:

The integer max value

getDefFetchsize

public int getDefFetchsize()

Gets the underlying connection default fetch size for DataBlock responses. On an embedded connection, there is no boundary restrictions, so we always return the integer max value.

Specified by:

getDefFetchsize in class nl.cwi.monetdb.jdbc.MonetConnection

Returns:

The integer max value

initialStringBuilderSize

public int initialStringBuilderSize()

Specified by:

initialStringBuilderSize in class nl.cwi.monetdb.jdbc.MonetConnection

getSoTimeout

public int getSoTimeout() throws SocketException

In a embedded connection there is no timeout, so this methods always adds a SQLWarning and returns -1.

Specified by:

getSoTimeout in class nl.cwi.monetdb.jdbc.MonetConnection

Returns:

-1

Throws:

SocketException

setSoTimeout

public void setSoTimeout(int timeout) throws SocketException

In a embedded connection there is no timeout, so this methods always adds a SQLWarning and the timeout parameter is ignored.

Specified by:

setSoTimeout in class nl.cwi.monetdb.jdbc.MonetConnection

Parameters:

timeout - The specified timeout, in milliseconds (ignored)

Throws:

SocketException

closeUnderlyingConnection

public void closeUnderlyingConnection() throws IOException

Closes the underlying connection implementation. On a embedded connection, after the connection is closed, if there are no more connections on the database, then the database is also shut down.

Specified by:

closeUnderlyingConnection in class nl.cwi.monetdb.jdbc.MonetConnection

Throws:

IOException - if an error happens while closing the connection or the database

sendControlCommand

public void sendControlCommand(int commandID, int data) throws SQLException

Sends a control command to the server. On an embedded connection, a specific call is performed for each command on the server.

Specified by:

sendControlCommand in class nl.cwi.monetdb.jdbc.MonetConnection

Parameters:

commandID - the command identifier according to ControlCommands listing

data - The integer to send according to the control command

Throws:

SQLException - if an IO exception or a database error occurs

executeNextQueryBatch

protected boolean executeNextQueryBatch(nl.cwi.monetdb.jdbc.MonetStatement statement, List<String> batch, int[] counts, BatchUpdateException e) throws SQLException

Execute a batch query in an embedded connection.

Specified by:

executeNextQueryBatch in class nl.cwi.monetdb.jdbc.MonetConnection

Parameters:

statement - The original MonetStatement where the batch comes from

batch - The list of queries to execute

counts - The return of the update statement of each input query

e - An exception to be thrown if an error occurs

Returns:

If all queries in the batch executed successfully or not

Throws:

SQLException - if an IO exception or a database error occurs