Package weka.core.converters

Class DatabaseConnection

java.lang.Object

weka.experiment.DatabaseUtils

weka.core.converters.DatabaseConnection

All Implemented Interfaces:

Serializable, RevisionHandler

public class DatabaseConnection
extends DatabaseUtils

Connects to a database.

Version:

$Revision: 8034 $

Author:

Len Trigg (trigg@cs.waikato.ac.nz), Stefan Mutter (mutter@cs.waikato.ac.nz)

See Also:

• Serialized Form

Field Summary

Fields inherited from class weka.experiment.DatabaseUtils

BOOL, BYTE, DATE, DOUBLE, EXP_INDEX_TABLE, EXP_RESULT_COL, EXP_RESULT_PREFIX, EXP_SETUP_COL, EXP_TYPE_COL, FLOAT, INTEGER, LONG, PROPERTY_FILE, SHORT, STRING, TEXT, TIME, TIMESTAMP

Constructor Summary

Constructors

Constructor	Description
DatabaseConnection()	Sets up the database drivers.
DatabaseConnection(File propsFile)	Reads the properties from the specified file and sets up the database drivers.
DatabaseConnection(Properties props)	Uses the specified properties to set up the database drivers.

Method Summary

Modifier and Type	Method	Description
DatabaseMetaData	getMetaData()	Gets meta data for the database connection object.
Properties	getProperties()	Returns the underlying properties object.
String	getRevision()	Returns the revision string.
int	getUpdateCount()	Dewtermines if the current query retrieves a result set or updates a table
boolean	getUpperCase()	Check if the property checkUpperCaseNames in the DatabaseUtils file is set to true or false.

Methods inherited from class weka.experiment.DatabaseUtils

arrayToString, attributeCaseFix, close, close, connectToDatabase, createExperimentIndex, createExperimentIndexEntry, createResultsTable, databaseURLTipText, debugTipText, disconnectFromDatabase, execute, experimentIndexExists, getDatabaseURL, getDebug, getKeywords, getKeywordsMaskChar, getPassword, getResultFromTable, getResultSet, getResultsTableName, getSupportedCursorScrollType, getUsername, initialize, initialize, isConnected, isCursorScrollable, isCursorScrollSensitive, isKeyword, maskKeyword, passwordTipText, processKeyString, putResultInTable, select, setDatabaseURL, setDebug, setKeywords, setKeywordsMaskChar, setPassword, setUsername, tableExists, translateDBColumnType, typeName, update, usernameTipText

Methods inherited from class java.lang.Object

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

Constructor Details

DatabaseConnection

public DatabaseConnection()
                   throws Exception

Sets up the database drivers.

Throws:

Exception - if an error occurs

DatabaseConnection

public DatabaseConnection(File propsFile)
                   throws Exception

Reads the properties from the specified file and sets up the database drivers.

Parameters:

propsFile - the props file to load, ignored if null or pointing to a directory

Throws:

Exception - if an error occurs

DatabaseConnection

public DatabaseConnection(Properties props)
                   throws Exception

Uses the specified properties to set up the database drivers.

Parameters:

props - the properties to use, ignored if null

Throws:

Exception - if an error occurs

Method Details

getProperties

public Properties getProperties()

Returns the underlying properties object.

Returns:

the properties object

getUpperCase

public boolean getUpperCase()

Check if the property checkUpperCaseNames in the DatabaseUtils file is set to true or false.

Returns:

true if the property checkUpperCaseNames in the DatabaseUtils file is set to true, false otherwise.

getMetaData

public DatabaseMetaData getMetaData()
                             throws Exception

Gets meta data for the database connection object.

Returns:

the meta data.

Throws:

Exception - if an error occurs

getUpdateCount

public int getUpdateCount()
                   throws SQLException

Dewtermines if the current query retrieves a result set or updates a table

Returns:

the update count (-1 if the query retrieves a result set).

Throws:

SQLException - if an error occurs

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Overrides:

getRevision in class DatabaseUtils

Returns:

the revision