diff options
| -rw-r--r-- | vdrmanager/src/de/bjusystems/vdrmanager/data/db/DBAccess.java | 170 |
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; + } + +} |