Difference between revisions of "ConvertingToDatabaseProject"
From Protege Wiki
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* '''Non-streaming conversion''': Loading the OWL file in memory and then dumping it into a database | * '''Non-streaming conversion''': Loading the OWL file in memory and then dumping it into a database | ||
* '''Streaming''': Stream the OWL file directly in the database | * '''Streaming''': Stream the OWL file directly in the database | ||
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=== Non-streaming conversion === | === Non-streaming conversion === | ||
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private final static String user = "myUser"; | private final static String user = "myUser"; | ||
private final static String password = "myPassword"; | private final static String password = "myPassword"; | ||
| − | private final static String uri = "file:/tmp/pizza/pizza.owl"; | + | //private final static String uri = "file:/tmp/pizza/pizza.owl"; |
@SuppressWarnings("unchecked") | @SuppressWarnings("unchecked") | ||
| Line 62: | Line 64: | ||
| − | == Streaming conversion == | + | === Streaming conversion === |
The streaming conversion should be used for very large ontologies that cannot be loaded in memory. This method dumps the ontology directly in the database without loading it completely in memory. | The streaming conversion should be used for very large ontologies that cannot be loaded in memory. This method dumps the ontology directly in the database without loading it completely in memory. | ||
| Line 96: | Line 98: | ||
| − | = | + | == Other resources == |
[http://protege.stanford.edu/doc/design/jdbc_backend.html Database schema used by the Protege database backend] | [http://protege.stanford.edu/doc/design/jdbc_backend.html Database schema used by the Protege database backend] | ||
[http://protege.stanford.edu/plugins/owl/api/guide.html Protege-OWL API Programmer's Guide] | [http://protege.stanford.edu/plugins/owl/api/guide.html Protege-OWL API Programmer's Guide] | ||
Revision as of 18:07, January 3, 2008
Contents
Converting an OWL file to OWL Database backend
There are 2 ways in which the conversion from an OWL file to the database backend can be done:
- Non-streaming conversion: Loading the OWL file in memory and then dumping it into a database
- Streaming: Stream the OWL file directly in the database
Non-streaming conversion
The following routine will convert an OWL file project to an OWL database project by first loading it into memory and then by dumping it into a database backend.
This is a good option for medium to large ontologies that can be loaded in memory. It is also faster than the streaming solution.
One flaw of this method is that the forms information is lost. We will provide a better version later.
private final static String driver = "com.mysql.jdbc.Driver";
private final static String url = "jdbc:mysql://localhost/protege";
private final static String table = "newtable";
private final static String user = "myUser";
private final static String password = "myPassword";
//private final static String uri = "file:/tmp/pizza/pizza.owl";
@SuppressWarnings("unchecked")
private static OWLModel convertToDatabaseProject(OWLModel fileModel) throws Exception {
System.out.println("In Convert to Database Project");
List errors = new ArrayList();
Project fileProject = fileModel.getProject();
OWLDatabaseKnowledgeBaseFactory factory = new OWLDatabaseKnowledgeBaseFactory();
PropertyList sources = PropertyList.create(fileProject.getInternalProjectKnowledgeBase());
DatabaseKnowledgeBaseFactory.setSources(sources, driver, url, table, user, password);
factory.saveKnowledgeBase(fileModel, sources, errors);
displayErrors(errors); //optional
if (!errors.isEmpty()) {
return null;
}
Project dbProject = Project.createNewProject(factory, errors);
DatabaseKnowledgeBaseFactory.setSources(dbProject.getSources(), driver, url, table, user, password);
dbProject.createDomainKnowledgeBase(factory, errors, true);
dbProject.setProjectURI(URIUtilities.createURI(dbProjectFile));
dbProject.save(errors);
displayErrors(errors); //optional
return (OWLModel) dbProject.getKnowledgeBase();
}
If you don't need the file model after this call you need to dispose it to save memory. To dispose the file model call:
fileModel.dispose()
Streaming conversion
The streaming conversion should be used for very large ontologies that cannot be loaded in memory. This method dumps the ontology directly in the database without loading it completely in memory.
private final static String driver = "com.mysql.jdbc.Driver";
private final static String url = "jdbc:mysql://localhost/protege";
private final static String table = "newtable";
private final static String user = "myUser";
private final static String password = "myPassword";
//private final static String uri = "file:/tmp/pizza/pizza.owl";
public static void convertToDatabaseProjectStreaming(URI uri) throws URISyntaxException {
CreateOWLDatabaseFromFileProjectPlugin creator = new CreateOWLDatabaseFromFileProjectPlugin();
creator.setKnowledgeBaseFactory(new OWLDatabaseKnowledgeBaseFactory());
creator.setDriver(driver);
creator.setURL(url);
creator.setTable(table);
creator.setUsername(user);
creator.setPassword(password);
creator.setOntologyFileURI(uri);
creator.setUseExistingSources(true);
Project p = creator.createProject();
List errors = new ArrayList();
p.save(errors);
}
Other resources
Database schema used by the Protege database backend Protege-OWL API Programmer's Guide
