Package nl.cwi.monetdb.jdbc

Class MonetConnection

java.lang.Object

nl.cwi.monetdb.jdbc.MonetWrapper

nl.cwi.monetdb.jdbc.MonetConnection

All Implemented Interfaces:

AutoCloseable, Connection, Wrapper

public abstract class MonetConnection
extends MonetWrapper
implements Connection, AutoCloseable

A Connection suitable for the MonetDB database. This connection represents a connection (session) to a MonetDB database. SQL statements are executed and results are returned within the context of a connection. This Connection object holds a physical connection to the MonetDB database. A Connection object's database should 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 obtained with the getMetaData method. Note: By default a Connection object is in auto-commit mode, which means that it automatically commits changes after executing each statement. If auto-commit mode has been disabled, the method commit must be called explicitly in order to commit changes; otherwise, database changes will not be saved. The current state of this connection is that it nearly implements the whole Connection interface.

Version:

1.3

Author:

Fabian Groffen, Martin van Dinther, Pedro Ferreira

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	MonetConnection.ResponseList	A list of Response objects.

Field Summary

Fields

Modifier and Type	Field	Description
protected Properties	conn_props	The successful processed input properties
protected String	hash	Authentication hash method
protected nl.cwi.monetdb.mcl.connection.IMonetDBLanguage	language	The language to connect with
protected nl.cwi.monetdb.mcl.protocol.AbstractProtocol	protocol	The underlying proticol provided by the connection (MAPI or embedded)

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
MonetConnection(Properties props, String hash, nl.cwi.monetdb.mcl.connection.IMonetDBLanguage language, boolean blobIsBinary, boolean clobIsLongChar)	Constructor of a Connection for MonetDB.

Method Summary

Modifier and Type	Method	Description
void	abort(Executor executor)	Terminates an open connection.
void	clearWarnings()	Clears all warnings reported for this Connection object.
void	close()	Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.
abstract void	closeUnderlyingConnection()	Closes the underlying connection implementation.
void	commit()	Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by this Connection object.
abstract List<String>	connect(String user, String pass)	Connects to the server, authenticating the user.
Array	createArrayOf(String typeName, Object[] elements)	Factory method for creating Array objects.
Blob	createBlob()	Constructs an object that implements the Blob interface.
Clob	createClob()	Constructs an object that implements the Clob interface.
NClob	createNClob()	Constructs an object that implements the NClob interface.
SQLXML	createSQLXML()	Constructs an object that implements the SQLXML interface.
Statement	createStatement()	Creates a Statement object for sending SQL statements to the database.
Statement	createStatement(int resultSetType, int resultSetConcurrency)	Creates a Statement object that will generate ResultSet objects with the given type and concurrency.
Statement	createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)	Creates a Statement object that will generate ResultSet objects with the given type, concurrency, and holdability.
Struct	createStruct(String typeName, Object[] attributes)	Factory method for creating Struct objects.
protected abstract boolean	executeNextQueryBatch(MonetStatement statement, List<String> batch, int[] counts, BatchUpdateException e)	Execute a batch of SQL query statements.
protected void	finalize()	Destructor called by garbage collector before destroying this object tries to disconnect the MonetDB connection if it has not been disconnected already.
boolean	getAutoCommit()	Retrieves the current auto-commit mode for this Connection object.
abstract int	getBlockSize()	Gets the underlying connection block size length.
String	getCatalog()	Retrieves this Connection object's current catalog name.
Properties	getClientInfo()	Returns a list containing the name and current value of each client info property supported by the driver.
String	getClientInfo(String name)	Returns the value of the client info property specified by name.
abstract int	getDefFetchsize()	Gets the underlying connection default fetch size for DataBlock responses.
int	getHoldability()	Retrieves the current holdability of ResultSet objects created using this Connection object.
abstract String	getJDBCURL()	Gets the underlying connection JDBC String URL.
nl.cwi.monetdb.mcl.connection.IMonetDBLanguage	getLanguage()	Gets the connection's language data.
DatabaseMetaData	getMetaData()	Retrieves a DatabaseMetaData object that contains metadata about the database to which this Connection object represents a connection.
int	getNetworkTimeout()	Retrieves the number of milliseconds the driver will wait for a database request to complete.
nl.cwi.monetdb.mcl.protocol.AbstractProtocol	getProtocol()	Gets the connection's protocol.
String	getSchema()	Retrieves this Connection object's current schema name.
static int	getSeqCounter()	Gets the current sequence counter.
abstract int	getSoTimeout()	Gets the underlying connection socket timeout.
int	getTransactionIsolation()	Retrieves this Connection object's current transaction isolation level.
Map<String,Class<?>>	getTypeMap()	Retrieves the Map object associated with this Connection object.
SQLWarning	getWarnings()	Retrieves the first warning reported by calls on this Connection object.
abstract int	initialStringBuilderSize()	Gets the initial value for the StringBuilder size.
boolean	isClosed()	Retrieves whether this Connection object has been closed.
boolean	isEmbedded()	Checks if the conection is embedded or not
boolean	isReadOnly()	Retrieves whether this Connection object is in read-only mode.
boolean	isValid(int timeout)	Returns true if the connection has not been closed and is still valid.
boolean	mapBlobAsVarBinary()
boolean	mapClobAsVarChar()
String	nativeSQL(String sql)	Converts the given SQL statement into the system's native SQL grammar.
CallableStatement	prepareCall(String sql)	Creates a CallableStatement object for calling database stored procedures.
CallableStatement	prepareCall(String sql, int resultSetType, int resultSetConcurrency)	Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency.
CallableStatement	prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)	Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency.
PreparedStatement	prepareStatement(String sql)	Creates a PreparedStatement object for sending parameterized SQL statements to the database.
PreparedStatement	prepareStatement(String sql, int autoGeneratedKeys)	Creates a default PreparedStatement object that has the capability to retrieve auto-generated keys.
PreparedStatement	prepareStatement(String sql, int[] columnIndexes)	Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
PreparedStatement	prepareStatement(String sql, int resultSetType, int resultSetConcurrency)	Creates a PreparedStatement object that will generate ResultSet objects with the given type and concurrency.
PreparedStatement	prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability)	Creates a PreparedStatement object that will generate ResultSet objects with the given type, concurrency, and holdability.
PreparedStatement	prepareStatement(String sql, String[] columnNames)	Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array.
void	releaseSavepoint(Savepoint savepoint)	Removes the given Savepoint object from the current transaction.
void	rollback()	Undoes all changes made in the current transaction and releases any database locks currently held by this Connection object.
void	rollback(Savepoint savepoint)	Undoes all changes made after the given Savepoint object was set.
abstract void	sendControlCommand(int commandID, int data)	Sends a control command to the server.
void	setAutoCommit(boolean autoCommit)	Sets this connection's auto-commit mode to the given state.
void	setCatalog(String catalog)	Sets the given catalog name in order to select a subspace of this Connection object's database in which to work.
void	setClientInfo(String name, String value)	Sets the value of the client info property specified by name to the value specified by value.
void	setClientInfo(Properties props)	Sets the value of the connection's client info properties.
void	setHoldability(int holdability)	Changes the default holdability of ResultSet objects created using this Connection object to the given holdability.
void	setNetworkTimeout(Executor executor, int millis)	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 as a hint to the driver to enable database optimizations.
Savepoint	setSavepoint()	Creates an unnamed savepoint in the current transaction and returns the new Savepoint object that represents it.
Savepoint	setSavepoint(String name)	Creates a savepoint with the given name in the current transaction and returns the new Savepoint object that represents it.
void	setSchema(String schema)	Sets the given schema name to access.
abstract void	setSoTimeout(int timeout)	Sets the underlying connection socket timeout.
void	setTransactionIsolation(int level)	Attempts to change the transaction isolation level for this Connection object to the one given.
void	setTypeMap(Map<String,Class<?>> map)	Installs the given TypeMap object as the type map for this Connection object.
String	toString()	Returns a string identifying this Connection to the MonetDB server.

Methods inherited from interface java.sql.Connection

beginRequest, endRequest, setShardingKey, setShardingKey, setShardingKeyIfValid, setShardingKeyIfValid

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.Wrapper

isWrapperFor, unwrap

Field Detail

conn_props

protected final Properties conn_props

The successful processed input properties

language

protected nl.cwi.monetdb.mcl.connection.IMonetDBLanguage language

The language to connect with

hash

protected final String hash

Authentication hash method

protocol

protected nl.cwi.monetdb.mcl.protocol.AbstractProtocol protocol

The underlying proticol provided by the connection (MAPI or embedded)

Constructor Detail

MonetConnection

public MonetConnection(Properties props,
                       String hash,
                       nl.cwi.monetdb.mcl.connection.IMonetDBLanguage language,
                       boolean blobIsBinary,
                       boolean clobIsLongChar)

Constructor of a Connection for MonetDB. At this moment the current implementation limits itself to storing the given host, database, username and password for later use by the createStatement() call. This constructor is only accessible to classes from the jdbc package.

Method Detail

getSeqCounter

public static int getSeqCounter()

Gets the current sequence counter.

Returns:

The current sequence counter

isEmbedded

public boolean isEmbedded()

Checks if the conection is embedded or not

Returns:

If the connection is embedded

getLanguage

public nl.cwi.monetdb.mcl.connection.IMonetDBLanguage getLanguage()

Gets the connection's language data.

Returns:

The connection's language data

getProtocol

public nl.cwi.monetdb.mcl.protocol.AbstractProtocol getProtocol()

Gets the connection's protocol.

Returns:

The connection's protocol

connect

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

Connects to the server, authenticating the user.

Parameters:

user - The user name to authenticate

pass - The user's password

Returns:

A List with informational (warning) messages. If this list is empty; then there are no warnings.

Throws:

IOException - if an I/O error occurs when creating the socket

nl.cwi.monetdb.mcl.protocol.ProtocolException - if bogus data is received

nl.cwi.monetdb.mcl.connection.MCLException - if an MCL related error occurs

getBlockSize

public abstract int getBlockSize()

Gets the underlying connection block size length.

Returns:

The block size length

getDefFetchsize

public abstract int getDefFetchsize()

Gets the underlying connection default fetch size for DataBlock responses.

Returns:

The default fetch size

initialStringBuilderSize

public abstract int initialStringBuilderSize()

Gets the initial value for the StringBuilder size.

Returns:

The initial value for the StringBuilder size

getSoTimeout

public abstract int getSoTimeout()
                          throws SocketException

Gets the underlying connection socket timeout.

Returns:

The underlying connection socket timeout

Throws:

SocketException

setSoTimeout

public abstract void setSoTimeout(int timeout)
                           throws SocketException

Sets the underlying connection socket timeout.

Parameters:

timeout - The specified timeout, in milliseconds. A timeout of zero is interpreted as an infinite timeout

Throws:

SocketException

closeUnderlyingConnection

public abstract void closeUnderlyingConnection()
                                        throws IOException

Closes the underlying connection implementation.

Throws:

IOException - if an I/O error occurs while closing the connection

getJDBCURL

public abstract String getJDBCURL()

Gets the underlying connection JDBC String URL.

Returns:

The underlying connection JDBC String URL

sendControlCommand

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

Sends a control command to the server.

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 abstract boolean executeNextQueryBatch(MonetStatement statement,
                                                 List<String> batch,
                                                 int[] counts,
                                                 BatchUpdateException e)
                                          throws SQLException

Execute a batch of SQL query statements.

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

close

public void close()

Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released. All Statements created from this Connection will be closed when this method is called. Calling the method close on a Connection object that is already closed is a no-op.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Connection

finalize

protected void finalize()
                 throws Throwable

Destructor called by garbage collector before destroying this object tries to disconnect the MonetDB connection if it has not been disconnected already.

Overrides:

finalize in class Object

Throws:

Throwable

clearWarnings

public void clearWarnings()

Clears all warnings reported for this Connection object. After a call to this method, the method getWarnings returns null until a new warning is reported for this Connection object.

Specified by:

clearWarnings in interface Connection

commit

public void commit()
            throws SQLException

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

Specified by:

commit in interface Connection

Throws:

SQLException - if a database access error occurs or this Connection object is in auto-commit mode

See Also:

setAutoCommit(boolean)

createStatement

public Statement createStatement()
                          throws SQLException

Creates a Statement object for sending SQL statements to the database. SQL statements without parameters are normally executed using Statement objects. If the same SQL statement is executed many times, it may be more efficient to use a PreparedStatement object. Result sets created using the returned Statement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY.

Specified by:

createStatement in interface Connection

Returns:

a new default Statement object

Throws:

SQLException - if a database access error occurs

createStatement

public Statement createStatement(int resultSetType,
                                 int resultSetConcurrency)
                          throws SQLException

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 concurrency to be overridden.

Specified by:

createStatement in interface Connection

Parameters:

resultSetType - a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE

resultSetConcurrency - a concurrency type; one of ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE

Returns:

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

Throws:

SQLException - if a database access error occurs

createStatement

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

Specified by:

createStatement in interface 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:

SQLException - if a database access error occurs or the given parameters are not ResultSet constants indicating type, concurrency, and holdability

getAutoCommit

public boolean getAutoCommit()
                      throws SQLException

Retrieves the current auto-commit mode for this Connection object.

Specified by:

getAutoCommit in interface Connection

Returns:

the current state of this Connection object's auto-commit mode

Throws:

SQLException

See Also:

setAutoCommit(boolean)

getCatalog

public String getCatalog()
                  throws SQLException

Retrieves this Connection object's current catalog name.

Specified by:

getCatalog in interface Connection

Returns:

the current catalog name or null if there is none

Throws:

SQLException - if a database access error occurs or the current language is not SQL

getHoldability

public int getHoldability()

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

Specified by:

getHoldability in interface Connection

Returns:

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

See Also:

setHoldability(int)

getMetaData

public DatabaseMetaData getMetaData()
                             throws SQLException

Retrieves a DatabaseMetaData object that contains metadata about the database to which this Connection object represents a connection. The metadata includes information about the database's tables, its supported SQL grammar, its stored procedures, the capabilities of this connection, and so on.

Specified by:

getMetaData in interface Connection

Returns:

a DatabaseMetaData object for this Connection object

Throws:

SQLException - if the current language is not SQL

getTransactionIsolation

public int getTransactionIsolation()

Retrieves this Connection object's current transaction isolation level.

Specified by:

getTransactionIsolation in interface Connection

Returns:

the current transaction isolation level, which will be Connection.TRANSACTION_SERIALIZABLE

getTypeMap

public Map<String,Class<?>> getTypeMap()

Retrieves the Map object associated with this Connection object. Unless the application has added an entry, the type map returned will be empty.

Specified by:

getTypeMap in interface Connection

Returns:

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

getWarnings

public SQLWarning getWarnings()
                       throws SQLException

Retrieves the first warning reported by calls on this Connection object. If there is more than one warning, subsequent warnings will be chained to the first one and can be retrieved by calling the method SQLWarning.getNextWarning on the warning that was retrieved previously. This method may not be called on a closed connection; doing so will cause an SQLException to be thrown. Note: Subsequent warnings will be chained to this SQLWarning.

Specified by:

getWarnings in interface Connection

Returns:

the first SQLWarning object or null if there are none

Throws:

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

isClosed

public boolean isClosed()

Retrieves whether this Connection object has been closed. A connection is closed if the method close has been called on it or if certain fatal errors have occurred. This method is guaranteed to return true only when it is called after the method Connection.close has been called. This method generally cannot be called to determine whether a connection to a database is valid or invalid. A typical client can determine that a connection is invalid by catching any exceptions that might be thrown when an operation is attempted.

Specified by:

isClosed in interface Connection

Returns:

true if this Connection object is closed; false if it is still open

isReadOnly

public boolean isReadOnly()

Retrieves whether this Connection object is in read-only mode. MonetDB currently doesn't support updateable result sets, but updates are possible. Hence the Connection object is never in read-only mode.

Specified by:

isReadOnly in interface Connection

Returns:

true if this Connection object is read-only; false otherwise

nativeSQL

public String nativeSQL(String sql)

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. Parameters: sql - an SQL statement that may contain one or more '?' parameter placeholders. Returns: the native form of this statement Throws: SQLException - if a database access error occurs or this method is called on a closed connection

Specified by:

nativeSQL in interface Connection

prepareCall

public CallableStatement prepareCall(String sql)
                              throws SQLException

Creates a CallableStatement object for calling database stored procedures. The CallableStatement object provides methods for setting up its IN and OUT parameters, and methods for executing the call to a stored procedure. Note: This method is optimized for handling stored procedure call statements. Some drivers may send the call statement to the database when the method prepareCall is done; others may wait until the CallableStatement object is executed. This has no direct effect on users; however, it does affect which method throws certain SQLExceptions. Result sets created using the returned CallableStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling getHoldability(). Parameters: sql - an SQL statement that may contain one or more '?' parameter placeholders. Typically this statement is specified using JDBC call escape syntax. Returns: a new default CallableStatement object containing the pre-compiled SQL statement Throws: SQLException - if a database access error occurs or this method is called on a closed connection

Specified by:

prepareCall in interface Connection

Throws:

SQLException

prepareCall

public CallableStatement prepareCall(String sql,
                                     int resultSetType,
                                     int resultSetConcurrency)
                              throws SQLException

Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the prepareCall method above, but it allows the default result set type and concurrency to be overridden. The holdability of the created result sets can be determined by calling getHoldability(). Parameters: sql - a String object that is the SQL statement to be sent to the database; may contain on or more '?' parameters Typically this statement is specified using JDBC call escape syntax. resultSetType - a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE resultSetConcurrency - a concurrency type; one of ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE Returns: a new CallableStatement object containing the pre-compiled SQL statement that will produce ResultSet objects with the given type and concurrency Throws: 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 and concurrency SQLFeatureNotSupportedException - if the JDBC driver does not support this method or this method is not supported for the specified result set type and result set concurrency.

Specified by:

prepareCall in interface Connection

Throws:

SQLException

prepareCall

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

Creates a CallableStatement object that will generate ResultSet objects with the given type and concurrency. This method is the same as the prepareCall method above, but it allows the default result set type, result set concurrency type and holdability to be overridden. Parameters: sql - a String object that is the SQL statement to be sent to the database; may contain on or more '?' parameters Typically this statement is specified using JDBC call escape syntax. resultSetType - a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE resultSetConcurrency - a concurrency type; one of 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 CallableStatement object, containing the pre-compiled SQL statement, that will generate ResultSet objects with the given type, concurrency, and holdability Throws: 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 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.

Specified by:

prepareCall in interface Connection

Throws:

SQLException

prepareStatement

public PreparedStatement prepareStatement(String sql)
                                   throws SQLException

Creates a PreparedStatement object for sending parameterized SQL statements to the database. A SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object. This object can then be used to efficiently execute this statement multiple times. Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLException objects. Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY.

Specified by:

prepareStatement in interface Connection

Parameters:

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

Returns:

a new default PreparedStatement object containing the pre-compiled SQL statement

Throws:

SQLException - if a database access error occurs

prepareStatement

public PreparedStatement prepareStatement(String sql,
                                          int resultSetType,
                                          int resultSetConcurrency)
                                   throws SQLException

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 concurrency to be overridden.

Specified by:

prepareStatement in interface 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 - a result set type; one of ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE

resultSetConcurrency - a concurrency type; one of ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE

Returns:

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

Throws:

SQLException - if a database access error occurs or the given parameters are not ResultSet constants indicating type and concurrency

prepareStatement

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

Specified by:

prepareStatement in interface 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:

SQLException - if a database access error occurs or the given parameters are not ResultSet constants indicating type, concurrency, and holdability

prepareStatement

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

Creates a default PreparedStatement object that has the capability to retrieve auto-generated keys. The given constant tells the driver whether it should make auto-generated keys available for retrieval. This parameter is ignored if the SQL statement is not an INSERT statement. Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions. Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY.

Specified by:

prepareStatement in interface Connection

Parameters:

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

autoGeneratedKeys - a flag indicating whether auto-generated keys should be returned; one of Statement.RETURN_GENERATED_KEYS or Statement.NO_GENERATED_KEYS

Returns:

a new PreparedStatement object, containing the pre-compiled SQL statement, that will have the capability of returning auto-generated keys

Throws:

SQLException - - if a database access error occurs or the given parameter is not a Statement constant indicating whether auto-generated keys should be returned

prepareStatement

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

Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array. This array contains the indexes of the columns in the target table that contain the auto-generated keys that should be made available. The driver will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific). An SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object. This object can then be used to efficiently execute this statement multiple times. Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions. Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling getHoldability(). Parameters: sql - an SQL statement that may contain one or more '?' IN parameter placeholders columnIndexes - an array of column indexes indicating the columns that should be returned from the inserted row or rows Returns: a new PreparedStatement object, containing the pre-compiled statement, that is capable of returning the auto-generated keys designated by the given array of column indexes Throws: SQLException - if a database access error occurs or this method is called on a closed connection SQLFeatureNotSupportedException - if the JDBC driver does not support this method

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareStatement

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

Creates a default PreparedStatement object capable of returning the auto-generated keys designated by the given array. This array contains the names of the columns in the target table that contain the auto-generated keys that should be returned. The driver will ignore the array if the SQL statement is not an INSERT statement, or an SQL statement able to return auto-generated keys (the list of such statements is vendor-specific). An SQL statement with or without IN parameters can be pre-compiled and stored in a PreparedStatement object. This object can then be used to efficiently execute this statement multiple times. Note: This method is optimized for handling parametric SQL statements that benefit from precompilation. If the driver supports precompilation, the method prepareStatement will send the statement to the database for precompilation. Some drivers may not support precompilation. In this case, the statement may not be sent to the database until the PreparedStatement object is executed. This has no direct effect on users; however, it does affect which methods throw certain SQLExceptions. Result sets created using the returned PreparedStatement object will by default be type TYPE_FORWARD_ONLY and have a concurrency level of CONCUR_READ_ONLY. The holdability of the created result sets can be determined by calling getHoldability(). Parameters: sql - an SQL statement that may contain one or more '?' IN parameter placeholders columnNames - an array of column names indicating the columns that should be returned from the inserted row or rows Returns: a new PreparedStatement object, containing the pre-compiled statement, that is capable of returning the auto-generated keys designated by the given array of column names Throws: SQLException - if a database access error occurs or this method is called on a closed connection SQLFeatureNotSupportedException - if the JDBC driver does not support this method

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

releaseSavepoint

public void releaseSavepoint(Savepoint savepoint)
                      throws SQLException

Removes the given Savepoint object 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 Connection

Parameters:

savepoint - the Savepoint object to be removed

Throws:

SQLException - if a database access error occurs or the given Savepoint object is not a valid savepoint in the current transaction

rollback

public void rollback()
              throws SQLException

Undoes all changes made in the current transaction and releases any database locks currently held by this Connection object. This method should be used only when auto-commit mode has been disabled.

Specified by:

rollback in interface Connection

Throws:

SQLException - if a database access error occurs or this Connection object is in auto-commit mode

See Also:

setAutoCommit(boolean)

rollback

public void rollback(Savepoint savepoint)
              throws 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 Connection

Parameters:

savepoint - the Savepoint object to roll back to

Throws:

SQLException - if a database access error occurs, the Savepoint object is no longer valid, or this Connection object is currently in auto-commit mode

setAutoCommit

public void setAutoCommit(boolean autoCommit)
                   throws SQLException

Sets this connection's auto-commit mode to the given state. If a connection is in auto-commit mode, then all its SQL statements will be executed and committed as individual transactions. Otherwise, its SQL statements are grouped into transactions that are terminated by a call to either the method commit or the method rollback. By default, new connections are in auto-commit mode. The commit occurs when the statement completes or the next execute occurs, whichever comes first. In the case of statements returning a ResultSet object, the statement completes when the last row of the ResultSet object has been retrieved or the ResultSet object has been closed. In advanced cases, a single statement may return multiple results as well as output parameter values. In these cases, the commit occurs when all results and output parameter values have been retrieved. NOTE: If this method is called during a transaction, the transaction is committed.

Specified by:

setAutoCommit in interface Connection

Parameters:

autoCommit - true to enable auto-commit mode; false to disable it

Throws:

SQLException - if a database access error occurs

See Also:

getAutoCommit()

setCatalog

public void setCatalog(String catalog)
                throws SQLException

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

Specified by:

setCatalog in interface Connection

Throws:

SQLException

setHoldability

public void setHoldability(int holdability)
                    throws SQLException

Changes the default holdability of ResultSet objects created using this Connection object to the given holdability. The default holdability of ResultSet objects can be be determined by invoking DatabaseMetaData.getResultSetHoldability().

Specified by:

setHoldability in interface Connection

Parameters:

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

Throws:

SQLException

See Also:

getHoldability()

setReadOnly

public void setReadOnly(boolean readOnly)
                 throws SQLException

Puts this connection in read-only mode as a hint to the driver to enable database optimizations. MonetDB doesn't support any mode here, hence an SQLWarning is generated if attempted to set to true here.

Specified by:

setReadOnly in interface Connection

Parameters:

readOnly - true enables read-only mode; false disables it

Throws:

SQLException - if a database access error occurs or this method is called during a transaction.

setSavepoint

public Savepoint setSavepoint()
                       throws SQLException

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

Specified by:

setSavepoint in interface Connection

Returns:

the new Savepoint object

Throws:

SQLException - if a database access error occurs or this Connection object is currently in auto-commit mode

setSavepoint

public Savepoint setSavepoint(String name)
                       throws SQLException

Creates a savepoint with the given name in the current transaction and returns the new Savepoint object that represents it.

Specified by:

setSavepoint in interface Connection

Parameters:

name - a String containing the name of the savepoint

Returns:

the new Savepoint object

Throws:

SQLException - if a database access error occurs or this Connection object is currently in auto-commit mode

setTransactionIsolation

public void setTransactionIsolation(int level)

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

Specified by:

setTransactionIsolation in interface Connection

Parameters:

level - one of the following Connection constants: Connection.TRANSACTION_READ_UNCOMMITTED, Connection.TRANSACTION_READ_COMMITTED, Connection.TRANSACTION_REPEATABLE_READ, or Connection.TRANSACTION_SERIALIZABLE.

setTypeMap

public void setTypeMap(Map<String,Class<?>> map)

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

Specified by:

setTypeMap in interface Connection

Parameters:

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

toString

public String toString()

Returns a string identifying this Connection to the MonetDB server.

Overrides:

toString in class Object

Returns:

a String representing this Object

createArrayOf

public Array createArrayOf(String typeName,
                           Object[] elements)
                    throws 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 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

Returns:

an Array object whose elements map to the specified SQL type

Throws:

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

SQLFeatureNotSupportedException - the JDBC driver does not support this data type

Since:

1.6

createClob

public Clob createClob()
                throws 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 Connection

Returns:

a MonetClob instance

Throws:

SQLFeatureNotSupportedException - the JDBC driver does not support MonetClob objects that can be filled in

SQLException

Since:

1.6

createBlob

public Blob createBlob()
                throws 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 Connection

Returns:

a MonetBlob instance

Throws:

SQLFeatureNotSupportedException - the JDBC driver does not support MonetBlob objects that can be filled in

SQLException

Since:

1.6

createNClob

public NClob createNClob()
                  throws 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 Connection

Returns:

an NClob instance

Throws:

SQLFeatureNotSupportedException - the JDBC driver does not support MonetNClob objects that can be filled in

SQLException

Since:

1.6

createStruct

public Struct createStruct(String typeName,
                           Object[] attributes)
                    throws SQLException

Factory method for creating Struct objects.

Specified by:

createStruct in interface 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:

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

SQLFeatureNotSupportedException - the JDBC driver does not support this data type

Since:

1.6

createSQLXML

public SQLXML createSQLXML()
                    throws 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 Connection

Returns:

An object that implements the SQLXML interface

Throws:

SQLFeatureNotSupportedException - the JDBC driver does not support this data type

SQLException

Since:

1.6

isValid

public boolean isValid(int timeout)
                throws 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 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:

SQLException - if the value supplied for timeout is less than 0

Since:

1.6

getClientInfo

public String getClientInfo(String name)
                     throws 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 Connection

Parameters:

name - - The name of the client info property to retrieve

Returns:

The value of the client info property specified or null

Throws:

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

getClientInfo

public Properties getClientInfo()
                         throws 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 Connection

Returns:

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

Throws:

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

setClientInfo

public void setClientInfo(String name,
                          String value)
                   throws 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 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:

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

setClientInfo

public void setClientInfo(Properties props)
                   throws 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 Connection

Parameters:

props - - The list of client info properties to set

Throws:

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

setSchema

public void setSchema(String schema)
               throws SQLException

Sets the given schema name to access.

Specified by:

setSchema in interface Connection

Parameters:

schema - the name of a schema in which to work

Throws:

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

Since:

1.7

getSchema

public String getSchema()
                 throws SQLException

Retrieves this Connection object's current schema name.

Specified by:

getSchema in interface Connection

Returns:

the current schema name or null if there is none

Throws:

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

abort

public void abort(Executor executor)
           throws 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.

Specified by:

abort in interface Connection

Parameters:

executor - The Executor implementation which will be used by abort

Throws:

SQLException - if a database access error occurs or the executor is null

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

setNetworkTimeout

public void setNetworkTimeout(Executor executor,
                              int millis)
                       throws 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.

Specified by:

setNetworkTimeout in interface Connection

Parameters:

executor - The Executor implementation which will be used by setNetworkTimeout

millis - The time in milliseconds to wait for the database operation to complete

Throws:

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.

getNetworkTimeout

public int getNetworkTimeout()
                      throws 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 Connection

Returns:

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

Throws:

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

Since:

1.7

mapBlobAsVarBinary

public boolean mapBlobAsVarBinary()

Returns:

whether the JDBC BLOB type should be mapped to VARBINARY type. This allows generic JDBC programs to fetch Blob data via getBytes() instead of getBlob() and Blob.getBinaryStream() to reduce overhead.

mapClobAsVarChar

public boolean mapClobAsVarChar()

Returns:

whether the JDBC CLOB type should be mapped to VARCHAR type. This allows generic JDBC programs to fetch Clob data via getString() instead of getClob() and Clob.getCharacterStream() to reduce overhead.