To manage our database open and close activities, we encapsulate them in the MyDbs class. There are several good reasons to do this, the most important being that we can ensure our databases are closed by putting that activity in the MyDbs class destructor.

To begin, we import some needed classes:

// File: MyDbs.java
package db.GettingStarted;

import com.sleepycat.db.Database;
import com.sleepycat.db.DatabaseConfig;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.DatabaseType;

import java.io.FileNotFoundException; 

And then we write our class declaration and provided some necessary private data members:

public class MyDbs {

    // The databases that our application uses
    private Database vendorDb = null;
    private Database inventoryDb = null;

    private String vendordb = "VendorDB.db";
    private String inventorydb = "InventoryDB.db";

    // Our constructor does nothing
    public MyDbs() {} 

Next we need a setup() method. This is where we configure and open our databases.

    // The setup() method opens all our databases
    // for us.
    public void setup(String databasesHome)
        throws DatabaseException {

        DatabaseConfig myDbConfig = new DatabaseConfig();

        myDbConfig.setErrorStream(System.err);
        myDbConfig.setErrorPrefix("MyDbs");
        myDbConfig.setType(DatabaseType.BTREE);
        myDbConfig.setAllowCreate(true);

        // Now open, or create and open, our databases
        // Open the vendors and inventory databases
        try {
            vendordb = databasesHome + "/" + vendordb;
            vendorDb = new Database(vendordb,
                                    null,
                                    myDbConfig);

            inventorydb = databasesHome + "/" + inventorydb;
            inventoryDb = new Database(inventorydb,
                                        null,
                                        myDbConfig);
        } catch(FileNotFoundException fnfe) {
            System.err.println("MyDbs: " + fnfe.toString());
            System.exit(-1);
        }
    } 

Finally, we provide some getter methods, and our close() method.

   // getter methods
    public Database getVendorDB() {
        return vendorDb;
    }

    public Database getInventoryDB() {
        return inventoryDb;
    }

    // Close the databases
    public void close() {
        try {
            if (vendorDb != null) {
                vendorDb.close();
            }

            if (inventoryDb != null) {
                inventoryDb.close();
            }
        } catch(DatabaseException dbe) {
            System.err.println("Error closing MyDbs: " +
                                dbe.toString());
            System.exit(-1);
        }
    }
}