Android Open Source - android-open-street-map Custom Database Helper

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License

The source code is released under:
Apache License
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Java Source Code

package com.android.lib.map.osm.helpers;
/*from   w w w . j  av  a  2  s  . co  m*/
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import android.content.ContentValues;
import android.content.Context;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.android.lib.map.osm.R;

public class CustomDatabaseHelper {
    
  public SQLiteDatabase mDb;

  //private boolean mAlreadyTriedToOpenDb;
  protected Context mContext;
  
  
  public CustomDatabaseHelper(Context context) {
    //mAlreadyTriedToOpenDb = false;
    mContext = context;
  }

  public boolean openDatabase(Context context, File dbFile) {
    
    try {

      Log.i("SQLiteHelper", "Opening database at " + dbFile);
      mDb = SQLiteDatabase.openDatabase(dbFile.getAbsolutePath(), null, SQLiteDatabase.OPEN_READWRITE);
      return true;
        
    } catch (Exception e) {
      e.printStackTrace();
    }
    
    return false;
  }
  
  public boolean openOrCreateDatabase(Context context, File dbFile) {
  
    try {

      if (dbFile.exists()) {
        Log.i("SQLiteHelper", "Opening database at " + dbFile);
        mDb = SQLiteDatabase.openDatabase(dbFile.getAbsolutePath(), null, SQLiteDatabase.OPEN_READWRITE);
        return true;
        
        // Test if DB works properly
        //get(MapTile.TABLE_TILE_NAME, "tilekey");
        //---
        
        //if (DATABASE_VERSION > db.getVersion())
          //upgrade();
      } else {
        Log.i("SQLiteHelper", "Creating database at " + dbFile);
        mDb = SQLiteDatabase.openOrCreateDatabase(dbFile, null);
        Log.i("SQLiteHelper", "Opened database at " + dbFile);
        upgradeFromFile(mDb, R.raw.sql_osm_maptile);
        return true;
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    
    return false;
  }

  private void upgradeFromFile(SQLiteDatabase db, int ressourceId) {
    InputStream sqlFile = null;
    
    try {
      sqlFile = mContext.getResources().openRawResource(ressourceId);
    } catch (Resources.NotFoundException e) {
      e.printStackTrace();
      return;
    }

    BufferedReader br = new BufferedReader(new InputStreamReader(sqlFile));
    String line = null;

    try {
      while ((line = br.readLine()) != null) {
        db.execSQL(line);
      }
    } catch (SQLException se) {
    } catch (IOException e) {
    }  
  }
  
  public void close() {
    if (mDb != null && mDb.isOpen())
      mDb.close();
  }
  
  public boolean isOpen() {
    if (mDb == null)
      return false;
    return mDb.isOpen();
  }
  
  public long insert(String table, ContentValues values)  {
    try {
      return mDb.insertOrThrow(table, null, values);
    } catch (Exception e) {
      e.printStackTrace();
    }
    return 0;
  }
  
    public Cursor get(String table, String select){
        Cursor cursor = mDb.query(true, table, null, select, null, null, null, null, null);
        return cursor;
    }

    public Cursor get(String table, String select, String[] columns, String orderBy){
        return mDb.query(true, table, columns, select, null, null, null, orderBy, null);
    }

    public Cursor get(String table, String select, String[] columns, String orderBy, String limit){
        return mDb.query(true, table, columns, select, null, null, null, orderBy, limit);
    }
    
    public Cursor get(String table, String select, String orderBy, String limit){
        return mDb.query(true, table, null, select, null, null, null, orderBy, limit);
    }

    public Cursor get(String table, String select, String limit){
        return mDb.query(true, table, null, select, null, null, null, null, limit);
    }
    
    public Cursor query(String sql) {
      try {
        Cursor cursor = mDb.rawQuery(sql, null);
        return cursor;
      } catch (Exception e) {
        e.printStackTrace();
      }
      return null;
    }
    
    public int delete(String table, String where) {
        return mDb.delete(table, where, null);
    }

    public int update(String table,ContentValues values, String where) {
        return mDb.update(table, values, where, null);
    }
    
}
Java Source Code List
