Android Open Source - campus Database Helper

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License

The source code is released under:

GNU General Public License

Java Source Code

package lecho.app.campus.utils;
/*from   w  w w  .  j  av  a  2  s .  c o m*/
import lecho.app.campus.dao.DaoMaster;
import lecho.app.campus.dao.DaoMaster.DevOpenHelper;
import lecho.app.campus.dao.DaoSession;
import android.content.Context;

/**
 * Use this class to get DevOpenHelper, DaoMaster or DaoSession instance.
 * 
 * @author Lecho
 * 
 */
public abstract class DatabaseHelper {
  public static final String DB_NAME = "campus_db";
  // Single DevOpenHelper means single db connection.
  private static DevOpenHelper sDevOpenHelper;

  // Single DaoMaster means single db connection.
  private static DaoMaster sDaoMaster;

  private static DaoSession sDaoSession;

  public static DevOpenHelper getDevOpenHelper(Context context) {
    if (null == sDevOpenHelper) {
      sDevOpenHelper = new DevOpenHelper(context, DB_NAME, null);
    }
    return sDevOpenHelper;
  }

  public static DaoMaster getDaoMaster(Context context) {
    if (null == sDaoMaster) {
      sDaoMaster = new DaoMaster(getDevOpenHelper(context).getWritableDatabase());
    }
    return sDaoMaster;
  }

  /**
   * Returns always the same read/write session instance. Bleh... no double instance checking, not final, not enum:)
   * 
   * @param context
   * @return
   */
  public static DaoSession getDaoSession(Context context) {
    if (null == sDaoSession) {
      sDaoSession = getDaoMaster(context).newSession();
    }
    return sDaoSession;
  }

  public static void clearDB(Context context) {
    DaoSession daoSession = getDaoSession(context);
    daoSession.getPlaceCategoryDao().deleteAll();
    daoSession.getPlaceFacultyDao().deleteAll();
    daoSession.getPlaceUnitDao().deleteAll();
    daoSession.getPlaceDao().deleteAll();
    daoSession.getFacultyDao().deleteAll();
    daoSession.getCategoryDao().deleteAll();
    daoSession.getUnitDao().deleteAll();
  }
}

Java Source Code List

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