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Java Source Code / Java Documentation » RSS RDF » Jena 2.5.5 » com.hp.hpl.jena.db

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Class Diagram

Java Document (Java Doc)

com.hp.hpl.jena.db .IDBConnection

All known Subclasses:   com.hp.hpl.jena.db .DBConnection,
IDBConnection
public interface IDBConnection (Code)
Encapsulate the specification of a jdbc connection, mostly used to simplify the calling pattern for ModelRDB factory methods.
author:
   csayers (based on earlier code by der)
version:
   $Revision: 1.8 $ on $Date: 2008/01/02 12:09:17 $

Method Summary
public void cleanDB()
     Clear all RDF information from the database.
public void close()

public boolean containsDefaultModel()
     Test if a default model is contained in the database.
public boolean containsModel(String name)
     Test if a given model is contained in the database.
public ExtendedIterator getAllModelNames()

public Connection getConnection()
     Return the jdbc connection or null if we no longer have access to a connection.
public Model getDatabaseProperties()
     Returns a Jena Model containing database properties.
These describe the optimization/layout for the database.

If the database has not been formatted, then a default set of properties is returned.
public String getDatabaseType()
     Get the database type.
public Model getDefaultModelProperties()
     Retrieve a default set of model customization properties.
public IRDBDriver getDriver()
     Get the database-specific driver For this to work, it needs to know the type of database being used.
public IRDBDriver getDriver(String layout, String database)

public boolean isFormatOK()
     Return true if the database seems to be formated for RDF storage.
public void setDatabaseProperties(Model propertyModel)
     Sets database-specific properties.
These properties may only be set before the first Model has been stored in the database.
public void setDatabaseType(String databaseType)
     Set the database type manually.
public void setDriver(IRDBDriver driver)
     Set the IRDBDriver to use for this connection.

Method Detail
cleanDB
public void cleanDB() throws SQLException(Code)
Clear all RDF information from the database. This wipes all the information stored by Jena from the database. Obviously should be used with care.

close
public void close() throws SQLException(Code)
Close the jdbc connection

containsDefaultModel
public boolean containsDefaultModel() throws RDFRDBException(Code)
Test if a default model is contained in the database. A default model is a model for which no specific name was specified. (One that was created by calling ModelRDB.createModel without specifying a name). Boolean true if the model is contained in the database
throws:
  RDFDBException -
since:
   Jena 2.0

containsModel
public boolean containsModel(String name) throws RDFRDBException(Code)
Test if a given model is contained in the database.
Parameters:
  name - the name of a model which may be in the database Boolean true if the model is contained in the database
throws:
  RDFDBException -
since:
   Jena 2.0

getAllModelNames
public ExtendedIterator getAllModelNames() throws RDFRDBException(Code)
Retrieve a list of all models in the database Iterator over String names for graphs.
throws:
  RDFDBException -
since:
   Jena 2.0

getConnection
public Connection getConnection() throws SQLException(Code)
Return the jdbc connection or null if we no longer have access to a connection.

getDatabaseProperties
public Model getDatabaseProperties() throws RDFRDBException(Code)
Returns a Jena Model containing database properties.
These describe the optimization/layout for the database.

If the database has not been formatted, then a default set of properties is returned. Otherwise the actual properties are returned.

The returned Model is a copy, modifying it will have no effect on the database. (Use setDatabaseProperties to make changes).

since:
   Jena 2.0

getDatabaseType
public String getDatabaseType()(Code)
Get the database type. String database type, or null if unset
since:
   Jena 2.0

getDefaultModelProperties
public Model getDefaultModelProperties() throws RDFRDBException(Code)
Retrieve a default set of model customization properties. The returned default set of properties is suitable for use in a call to ModelRDB.create(..., modelProperties); Model containing default properties

getDriver
public IRDBDriver getDriver() throws RDFRDBException(Code)
Get the database-specific driver For this to work, it needs to know the type of database being used. That may be specified in the constructor (preferred) or done later by using the setDatabaseType method (for backward compatability).

getDriver
public IRDBDriver getDriver(String layout, String database) throws RDFRDBException(Code)
Helper function to locate and instantiate the driver class corresponding to a given layout and database name Throws an RDFRDBexception if the driver can't be instantiated

isFormatOK
public boolean isFormatOK() throws RDFRDBException(Code)
Return true if the database seems to be formated for RDF storage. This is not an integrity check this is simply a flag recording that a base level table exists. Any access errors are treated as the database not being formated.

setDatabaseProperties
public void setDatabaseProperties(Model propertyModel) throws RDFRDBException(Code)
Sets database-specific properties.
These properties may only be set before the first Model has been stored in the database. After that point, the database structure is frozen.

Use these properties to optionally customize the database - this won't change the results you see when using the graph interface, but it may alter the speed with which you get them or the space required by the database.

The properties must form a complete and consistent set. The easist way to get a complete and consistent set is to call getDatabaseProperties, modify the returned model, and then use that as an argument in the call to setDatabaseProperties.

Note that some implementations may choose to delay actually peforming the formatting operation until at least one Graph is constructed in the database. Consequently, a successful return from this call does not necessarily guarantee that the database properties were set correctly.

Parameters:
  propertyModel - is a Model describing the database parameters
since:
   Jena 2.0

setDatabaseType
public void setDatabaseType(String databaseType)(Code)
Set the database type manually.
This is not for public use (it is preferable to specify it in the constructor) - included here to handle older code, which didn't use the new constructor.

since:
   Jena 2.0

setDriver
public void setDriver(IRDBDriver driver)(Code)
Set the IRDBDriver to use for this connection. Useful to enable external drivers to be registered outside of the standard driver package.

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