br.ufg.integrate.wrapper.csv
Class CsvConnection

java.lang.Object
  br.ufg.integrate.wrapper.csv.CsvConnection

All Implemented Interfaces:

Connection, Wrapper

public class CsvConnection
extends Object
implements Connection

This class implements the Connection interface for the CsvJdbc driver.

Version:

$Id: CsvConnection.java,v 1.12 2004/08/09 05:03:05 jackerm Exp $

Author:

Jonathan Ackerman, Sander Brienen, Michael Maraya, Tomasz Skutnik

Field Summary

Fields inherited from interface java.sql.Connection

TRANSACTION_NONE, TRANSACTION_READ_COMMITTED, TRANSACTION_READ_UNCOMMITTED, TRANSACTION_REPEATABLE_READ, TRANSACTION_SERIALIZABLE

Constructor Summary

protected	CsvConnection(String schemaFile, String path) Creates a new CsvConnection that takes the supplied path
protected	CsvConnection(String schemaFile, String path, Properties info) Creates a new CsvConnection that takes the supplied path and properties

Method Summary

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.
void	commit() Makes all changes made since the previous commit/rollback permanent and releases any database locks currently held by this Connection object.
Array	createArrayOf(String arg0, Object[] arg1)
Blob	createBlob()
Clob	createClob()
NClob	createNClob()
SQLXML	createSQLXML()
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)
Struct	createStruct(String arg0, Object[] arg1)
boolean	getAutoCommit() Retrieves the current auto-commit mode for this Connection object.
String	getCatalog() Retrieves this Connection object's current catalog name.
protected String	getCharset() Accessor method for the charset property
Properties	getClientInfo()
String	getClientInfo(String arg0)
protected String	getExtension() Accessor method for the extension property
int	getHoldability() Retrieves the current holdability of ResultSet objects created using this Connection object.
DatabaseMetaData	getMetaData() Retrieves a DatabaseMetaData object that contains metadata about the database to which this Connection object represents a connection.
protected String	getPath() Accessor method for the path property
protected char	getSeperator() Accessor method for the separator property
int	getTransactionIsolation() Retrieves this Connection object's current transaction isolation level.
Map	getTypeMap() Retrieves the Map object associated with this Connection object.
SQLWarning	getWarnings() Retrieves the first warning reported by calls on this Connection object.
boolean	isClosed() Retrieves whether this Connection object has been closed.
boolean	isReadOnly() Retrieves whether this Connection object is in read-only mode.
protected boolean	isSuppressHeaders() Accessor method for the suppressHeaders property
boolean	isValid(int arg0)
boolean	isWrapperFor(Class<?> arg0)
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)
PreparedStatement	prepareStatement(String sql) Creates a PreparedStatement object for sending parameterized SQL statements to the database.
PreparedStatement	prepareStatement(String sql, int autoGeneratedKeys)
PreparedStatement	prepareStatement(String sql, int[] columnIndexes)
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)
PreparedStatement	prepareStatement(String sql, String[] columnNames)
void	releaseSavepoint(Savepoint savepoint)
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)
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(Properties arg0)
void	setClientInfo(String arg0, String arg1)
void	setHoldability(int holdability) Changes the holdability of ResultSet objects created using this Connection object to the given holdability.
void	setReadOnly(boolean readOnly) Puts this connection in read-only mode as a hint to the driver to enable database optimizations.
Savepoint	setSavepoint()
Savepoint	setSavepoint(String name)
void	setTransactionIsolation(int level) Attempts to change the transaction isolation level for this Connection object to the one given.
void	setTypeMap(Map map) Installs the given TypeMap object as the type map for this Connection object.
<T> T	unwrap(Class<T> arg0)

Methods inherited from class java.lang.Object

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

Constructor Detail

CsvConnection

protected CsvConnection(String schemaFile,
                        String path)

Creates a new CsvConnection that takes the supplied path

Parameters:

path - directory where the CSV files are located

CsvConnection

protected CsvConnection(String schemaFile,
                        String path,
                        Properties info)

Creates a new CsvConnection that takes the supplied path and properties

Parameters:

path - directory where the CSV files are located

info - set of properties containing custom options

Method Detail

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

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

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.

Specified by:

prepareCall in interface Connection

Parameters:

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

Returns:

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

Throws:

SQLException - if a database access error occurs

nativeSQL

public String nativeSQL(String sql)
                 throws SQLException

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 Connection

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

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()

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 - if a database access error occurs

See Also:

setAutoCommit(boolean)

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)

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)

close

public void close()
           throws SQLException

Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.

Calling the method close on a Connection object that is already closed is a no-op.

Note: A Connection object is automatically closed when it is garbage collected. Certain fatal errors also close a Connection object.

Specified by:

close in interface Connection

Throws:

SQLException - if a database access error occurs

isClosed

public boolean isClosed()
                 throws SQLException

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

Throws:

SQLException - if a database access error occurs

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. Adapted by Rogerio Arantes Gaioso

Specified by:

getMetaData in interface Connection

Returns:

a DatabaseMetaData object for this Connection object

Throws:

SQLException - if a database access error occurs

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.

Note: This method cannot be called during a transaction.

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

isReadOnly

public boolean isReadOnly()
                   throws SQLException

Retrieves whether this Connection object is in read-only mode.

Specified by:

isReadOnly in interface Connection

Returns:

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

Throws:

SQLException - if a database access error occurs

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

Parameters:

catalog - the name of a catalog (subspace in this Connection object's database) in which to work

Throws:

SQLException - if a database access error occurs

See Also:

getCatalog()

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

See Also:

setCatalog(java.lang.String)

setTransactionIsolation

public void setTransactionIsolation(int level)
                             throws SQLException

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.

Note: If this method is called during a transaction, the result is implementation-defined.

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. (Note that Connection.TRANSACTION_NONE cannot be used because it specifies that transactions are not supported.)

Throws:

SQLException - if a database access error occurs or the given parameter is not one of the Connection constants

See Also:

DatabaseMetaData.supportsTransactionIsolationLevel(int), getTransactionIsolation()

getTransactionIsolation

public int getTransactionIsolation()
                            throws SQLException

Retrieves this Connection object's current transaction isolation level.

Specified by:

getTransactionIsolation in interface Connection

Returns:

the current transaction isolation level, which will be one of the following constants: Connection.TRANSACTION_READ_UNCOMMITTED, Connection.TRANSACTION_READ_COMMITTED, Connection.TRANSACTION_REPEATABLE_READ, Connection.TRANSACTION_SERIALIZABLE, or Connection.TRANSACTION_NONE.

Throws:

SQLException - if a database access error occurs

See Also:

setTransactionIsolation(int)

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

See Also:

SQLWarning

clearWarnings

public void clearWarnings()
                   throws SQLException

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

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. Now also supports ResultSet.TYPE_SCROLL_SENSITIVE

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 or the given parameters are not ResultSet constants indicating type and concurrency

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

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.

Specified by:

prepareCall in interface Connection

Parameters:

sql - a String object that is the SQL statement to be sent to the database; may contain on or more ? 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 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 or the given parameters are not ResultSet constants indicating type and concurrency

getTypeMap

public Map getTypeMap()
               throws SQLException

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

Throws:

SQLException - if a database access error occurs

See Also:

setTypeMap(java.util.Map)

setTypeMap

public void setTypeMap(Map map)
                throws SQLException

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

Throws:

SQLException - if a database access error occurs or the given parameter is not a java.util.Map object

See Also:

getTypeMap()

setHoldability

public void setHoldability(int holdability)
                    throws SQLException

Changes the holdability of ResultSet objects created using this Connection object to the given holdability.

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 - if a database access occurs, the given parameter is not a ResultSet constant indicating holdability, or the given holdability is not supported

Since:

1.4

See Also:

getHoldability(), ResultSet

getHoldability

public int getHoldability()
                   throws SQLException

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

Throws:

SQLException - if a database access occurs

Since:

1.4

See Also:

setHoldability(int), ResultSet

setSavepoint

public Savepoint setSavepoint()
                       throws SQLException

Specified by:

setSavepoint in interface Connection

Throws:

SQLException

setSavepoint

public Savepoint setSavepoint(String name)
                       throws SQLException

Specified by:

setSavepoint in interface Connection

Throws:

SQLException

rollback

public void rollback(Savepoint savepoint)
              throws SQLException

Specified by:

rollback in interface Connection

Throws:

SQLException

releaseSavepoint

public void releaseSavepoint(Savepoint savepoint)
                      throws SQLException

Specified by:

releaseSavepoint in interface Connection

Throws:

SQLException

createStatement

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

Specified by:

createStatement in interface Connection

Throws:

SQLException

prepareStatement

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

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareCall

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

Specified by:

prepareCall in interface Connection

Throws:

SQLException

prepareStatement

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

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareStatement

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

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

prepareStatement

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

Specified by:

prepareStatement in interface Connection

Throws:

SQLException

createArrayOf

public Array createArrayOf(String arg0,
                           Object[] arg1)
                    throws SQLException

Specified by:

createArrayOf in interface Connection

Throws:

SQLException

createBlob

public Blob createBlob()
                throws SQLException

Specified by:

createBlob in interface Connection

Throws:

SQLException

createClob

public Clob createClob()
                throws SQLException

Specified by:

createClob in interface Connection

Throws:

SQLException

createNClob

public NClob createNClob()
                  throws SQLException

Specified by:

createNClob in interface Connection

Throws:

SQLException

createSQLXML

public SQLXML createSQLXML()
                    throws SQLException

Specified by:

createSQLXML in interface Connection

Throws:

SQLException

createStruct

public Struct createStruct(String arg0,
                           Object[] arg1)
                    throws SQLException

Specified by:

createStruct in interface Connection

Throws:

SQLException

getClientInfo

public Properties getClientInfo()
                         throws SQLException

Specified by:

getClientInfo in interface Connection

Throws:

SQLException

getClientInfo

public String getClientInfo(String arg0)
                     throws SQLException

Specified by:

getClientInfo in interface Connection

Throws:

SQLException

isValid

public boolean isValid(int arg0)
                throws SQLException

Specified by:

isValid in interface Connection

Throws:

SQLException

setClientInfo

public void setClientInfo(Properties arg0)
                   throws SQLClientInfoException

Specified by:

setClientInfo in interface Connection

Throws:

SQLClientInfoException

setClientInfo

public void setClientInfo(String arg0,
                          String arg1)
                   throws SQLClientInfoException

Specified by:

setClientInfo in interface Connection

Throws:

SQLClientInfoException

isWrapperFor

public boolean isWrapperFor(Class<?> arg0)
                     throws SQLException

Specified by:

isWrapperFor in interface Wrapper

Throws:

SQLException

unwrap

public <T> T unwrap(Class<T> arg0)
         throws SQLException

Specified by:

unwrap in interface Wrapper

Throws:

SQLException

getPath

protected String getPath()

Accessor method for the path property

Returns:

current value for the path property

getExtension

protected String getExtension()

Accessor method for the extension property

Returns:

current value for the extension property

getSeperator

protected char getSeperator()

Accessor method for the separator property

Returns:

current value for the separator property

isSuppressHeaders

protected boolean isSuppressHeaders()

Accessor method for the suppressHeaders property

Returns:

current value for the suppressHeaders property

getCharset

protected String getCharset()

Accessor method for the charset property

Returns:

current value for the suppressHeaders property