DBAccess

1 files changed, 170 insertions, 0 deletions

diff --git a/vdrmanager/src/de/bjusystems/vdrmanager/data/db/DBAccess.java b/vdrmanager/src/de/bjusystems/vdrmanager/data/db/DBAccess.java
new file mode 100644
index 0000000..f0c788b
--- /dev/null
+++ b/vdrmanager/src/de/bjusystems/vdrmanager/data/db/DBAccess.java
@@ -0,0 +1,170 @@
+package de.bjusystems.vdrmanager.data.db;
+
+import java.sql.SQLException;
+
+import android.content.Context;
+import android.database.sqlite.SQLiteDatabase;
+import android.util.Log;
+
+import com.j256.ormlite.android.apptools.OpenHelperManager;
+import com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper;
+import com.j256.ormlite.dao.RuntimeExceptionDao;
+import com.j256.ormlite.support.ConnectionSource;
+import com.j256.ormlite.table.TableUtils;
+
+import de.bjusystems.vdrmanager.R;
+import de.bjusystems.vdrmanager.data.Vdr;
+
+/**
+ * Database helper class used to manage the creation and upgrading of your
+ * database. This class also usually provides the DAOs used by the other
+ * classes.
+ */
+public class DBAccess extends OrmLiteSqliteOpenHelper {
+	
+	public static final String TAG = DBAccess.class.getName();
+	// name of the database file for your application -- change to something
+	// appropriate for your app
+	public static final String DATABASE_NAME = "vdrmanager.db";
+	// any time you make changes to your database objects, you may have to
+	// increase the database version
+	private static final int DATABASE_VERSION = 2;
+
+	private RuntimeExceptionDao<Vdr, Integer> vdrDAO = null;
+
+
+	
+	public static String getDataBaseFile(){
+		return "/data/data/de.bjusystems.vdrmanager/databases/" + DATABASE_NAME;
+	}
+	
+	public DBAccess(Context context) {
+		super(context, DATABASE_NAME, null, DATABASE_VERSION,
+				R.raw.ormlite_config);
+	}
+
+	/**
+	 * This is called when the database is first created. Usually you should
+	 * call createTable statements here to create the tables that will store
+	 * your data.
+	 */
+	@Override
+	public void onCreate(SQLiteDatabase db, ConnectionSource connectionSource) {
+		try {
+			Log.i(DBAccess.class.getName(), "onCreate");
+			TableUtils.createTable(connectionSource, Vdr.class);
+		} catch (SQLException e) {
+			Log.e(DBAccess.class.getName(), "Can't create database", e);
+			throw new RuntimeException(e);
+		}
+	}
+
+	/**
+	 * This is called when your application is upgraded and it has a higher
+	 * version number. This allows you to adjust the various data to match the
+	 * new version number.
+	 */
+	@Override
+	public void onUpgrade(SQLiteDatabase db, ConnectionSource connectionSource,
+			int oldVersion, int newVersion) {
+		try {
+			Log.i(DBAccess.class.getName(), "onUpgrade");
+			TableUtils.dropTable(connectionSource, Vdr.class, true);
+			// after we drop the old databases, we create the new ones
+			onCreate(db, connectionSource);
+		} catch (SQLException e) {
+			Log.e(DBAccess.class.getName(), "Can't drop databases", e);
+			throw new RuntimeException(e);
+		}
+	}
+
+
+	/**
+	 * Close the database connections and clear any cached DAOs.
+	 */
+	@Override
+	public void close() {
+		super.close();
+		vdrDAO = null;
+	}
+	
+
+	static volatile DBAccess helper;
+	static volatile boolean created = false;
+	static volatile boolean destroyed = false;
+	
+	
+	
+	/**
+	 * Get a helper for this action.
+	 */
+	public static DBAccess get(Context ctx) {
+
+		if (helper == null) {
+			helper = getHelperInternal(ctx);
+			created = true;
+		}
+		
+		
+		if (helper == null) {
+			if (!created) {
+				throw new IllegalStateException("A call has not been made to onCreate() yet so the helper is null");
+			} else if (destroyed) {
+				throw new IllegalStateException(
+						"A call to onDestroy has already been made and the helper cannot be used after that point");
+			} else {
+				throw new IllegalStateException("Helper is null for some unknown reason");
+			}
+		} else {
+			return helper;
+		}
+	}
+
+	/**
+	 * Get a connection source for this action.
+	 */
+	public ConnectionSource getConnectionSource(Context ctx) {
+		return get(ctx).getConnectionSource();
+	}
+
+
+	/**
+	 * This is called internally by the class to populate the helper object instance. This should not be called directly
+	 * by client code unless you know what you are doing. Use {@link #getHelper()} to get a helper instance. If you are
+	 * managing your own helper creation, override this method to supply this activity with a helper instance.
+	 * 
+	 * <p>
+	 * <b> NOTE: </b> If you override this method, you most likely will need to override the
+	 * {@link #releaseHelper(OrmLiteSqliteOpenHelper)} method as well.
+	 * </p>
+	 */
+	protected static DBAccess getHelperInternal(Context context) {
+		@SuppressWarnings({ "unchecked", "deprecation" })
+		DBAccess newHelper = (DBAccess) OpenHelperManager.getHelper(context, DBAccess.class);
+		logger.trace("{}: got new helper {} from OpenHelperManager", "", newHelper);
+		return newHelper;
+	}
+
+	/**
+	 * Release the helper instance created in {@link #getHelperInternal(Context)}. You most likely will not need to call
+	 * this directly since {@link #onDestroy()} does it for you.
+	 * 
+	 * <p>
+	 * <b> NOTE: </b> If you override this method, you most likely will need to override the
+	 * {@link #getHelperInternal(Context)} method as well.
+	 * </p>
+	 */
+	protected void releaseHelper(DBAccess helper) {
+		OpenHelperManager.releaseHelper();
+		logger.trace("{}: helper {} was released, set to null", this, helper);
+		DBAccess.helper = null;
+	}
+
+	public RuntimeExceptionDao<Vdr, Integer> getVdrDAO() {
+		if(vdrDAO == null){
+			vdrDAO = getRuntimeExceptionDao(Vdr.class);
+		}
+		return vdrDAO;
+	}
+	
+}