Examples of org.odmg.Database

org.odmg.Database
The interface for interacting with an ODMG database. Databases must be opened before starting any transactions that use the database and closed after ending these transactions.
A database application generally begins processing by accessing one or more critical objects and proceeding from there. These objects are root objects, because they lead to interconnected webs of other objects. The ability to name an object (using method bind) and retrieve it later by that name (using method lookup facilitates this start-up capability. A name is not explicitly defined as an attribute of an object. Naming an object also makes it persistent.
There is a single flat name scope per database; thus all names in a particular database are unique. @author David Jordan (as Java Editor of the Object Data Management Group) @version ODMG 3.0

        super.dispose();
        synchronized(this.databases) {
            final Set keys = this.databases.keySet();
            for( Iterator i = keys.iterator(); i.hasNext(); )
            {
                final Database db = (Database)i.next();
                try
                {
                    db.close();
                }
                catch( final ODMGException e) {
                    getLogger().error( "OJB-ODMG: Cannot close Database", e);
                }
                i.remove();

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.Odmg#getInstance()
     */
    public Implementation getInstance() throws ODMGException {
        Database db = (Database)this.databases.get( DEFAULT_CONNECTION );
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(DEFAULT_CONNECTION, DEFAULT_MODE);
            synchronized (this.databases) {
                this.databases.put( DEFAULT_CONNECTION + DEFAULT_MODE, db );
            }
        }
        return this.odmg;

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.Odmg#getInstance(java.lang.String, int)
     */
    public Implementation getInstance(String connection, int mode) throws ODMGException {
        Database db = (Database)this.databases.get( connection + mode);
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(connection, mode);
            synchronized (this.databases) {
                this.databases.put( connection + mode, db );
            }
        }
        return this.odmg;

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.Odmg#getInstance(java.lang.String)
     */
    public Implementation getInstance(String connection) throws ODMGException {
        Database db = (Database)this.databases.get( connection + DEFAULT_MODE);
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(connection, DEFAULT_MODE);
            synchronized (this.databases) {
                this.databases.put( connection + DEFAULT_MODE, db );
            }
        }
        return this.odmg;

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.OdmgImplementation#getInstance(int)
     */
    public Implementation getInstance( int mode ) throws ODMGException 
    {
        Database db = (Database)this.databases.get( DEFAULT_CONNECTION+ mode);
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(DEFAULT_CONNECTION, mode);
            synchronized (this.databases) {
                this.databases.put( DEFAULT_CONNECTION+ mode, db );
            }
        }
        return this.odmg;

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        super.dispose();
        synchronized(this.databases) {
            final Set keys = this.databases.keySet();
            for( Iterator i = keys.iterator(); i.hasNext(); )
            {
                final Database db = (Database)i.next();
                try
                {
                    db.close();
                }
                catch( final ODMGException e) {
                    getLogger().error( "OJB-ODMG: Cannot close Database", e);
                }
                i.remove();

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.Odmg#getInstance()
     */
    public Implementation getInstance() throws ODMGException {
        Database db = (Database)this.databases.get( DEFAULT_CONNECTION );
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(DEFAULT_CONNECTION, DEFAULT_MODE);
            synchronized (this.databases) {
                this.databases.put( DEFAULT_CONNECTION + DEFAULT_MODE, db );
            }
        }
        return this.odmg;

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.Odmg#getInstance(java.lang.String, int)
     */
    public Implementation getInstance(String connection, int mode) throws ODMGException {
        Database db = (Database)this.databases.get( connection + mode);
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(connection, mode);
            synchronized (this.databases) {
                this.databases.put( connection + mode, db );
            }
        }
        return this.odmg;

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.Odmg#getInstance(java.lang.String)
     */
    public Implementation getInstance(String connection) throws ODMGException {
        Database db = (Database)this.databases.get( connection + DEFAULT_MODE);
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(connection, DEFAULT_MODE);
            synchronized (this.databases) {
                this.databases.put( connection + DEFAULT_MODE, db );
            }
        }
        return this.odmg;

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    /* (non-Javadoc)
     * @see org.apache.cocoon.ojb.odmg.components.OdmgImplementation#getInstance(int)
     */
    public Implementation getInstance( int mode ) throws ODMGException 
    {
        Database db = (Database)this.databases.get( DEFAULT_CONNECTION+ mode);
        if(null == db ) {
            db = this.odmg.newDatabase();
            db.open(DEFAULT_CONNECTION, mode);
            synchronized (this.databases) {
                this.databases.put( DEFAULT_CONNECTION+ mode, db );
            }
        }
        return this.odmg;

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