Thursday, May 3, 2012

Sending Sqlite data of Android APP to Mysql database in PC

While I was working on a project which includes the transfer of data stored in sqlite database of Android APP to a Mysql database in PC, I searched over the web about how to do it. I could find some info about it here and there. But nothing concrete. So I thought I will put a write up on how to do it.

Here I used Wamp server which installed, Apache Web server, Php and MySQL. I opened the port so that anybody in the intranet can access the pages on this webserver.

Assume wamp is  on http://192.168.1.2/

Now create a database in mysql which is same as sqlite database of the Android APP.

Here I am using PHP as the intermediate file which gets the data from Android app and updates that data to MySQL database tables:

So here is the PHP script which does that 

Here in the below example,  "College" is the database in Mysql and "student" is a table containing name and branch as the columns.
Test.php
$con = mysql_connect("localhost","root","");
if (!$con)
 {
  die('Could not connect: ' . mysql_error());
 }

mysql_select_db("College", $con);

$name = $_POST['name'];
$branch = $_POST['branch'];

$sql = "INSERT INTO student(name,Branch)values('$name', '$Branch')";
      mysql_query($sql) or die(mysql_error());
mysql_close($con);
?>
Here in the Android app I create a button. Name it as "Sync" And on click of that button, the app will get the data from sqlite database and then access this PHP script to write the data to mysql database. So to access the internet to execute the php script, we need to add permission to AndroidManifest.xml 
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
Now we need to write the code for onclick button:
 DBAdapter dbAdapter=DBAdapter.getDBAdapterInstance(this);
 try {
       dbAdapter.createDataBase();
     } catch (IOException e) {
         Log.i("*** select ",e.getMessage());
         }
  
 dbAdapter.openDataBase();  
 String query="SELECT * FROM studentreport";
 ArrayList<ArrayList<String>> stringList = dbAdapter.selectRecordsFromDBList(query, null);
 dbAdapter.close();
String url="http://192.168.1.2/test.php";
DefaultHttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url);
try {       
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2); for (int i = 0; i < stringList.size(); i++) { ArrayList<String> list = stringList.get(i); nameValuePairs.add(new BasicNameValuePair("name", list.get(0))); nameValuePairs.add(new BasicNameValuePair("Branch", list.get(1)));
         httpPost .setEntity(new UrlEncodedFormEntity(nameValuePairs));  
  HttpResponse httpResponse = httpClient.execute(httpPost);
 }
     } catch (UnsupportedEncodingException e) 
     {
 // TODO Auto-generated catch block
 e.printStackTrace(); 
    } catch (ClientProtocolException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
    } catch (IllegalStateException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}     
}
//////////////////////////////////////////////
DbAdapter.java, You can add this class to src folder of the project:
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;

public class DBAdapter extends SQLiteOpenHelper {

 private static String DB_PATH ="";
 private static final String DB_NAME ="<database.sqlite>";
 private SQLiteDatabase myDataBase;
 private final Context myContext;

 private static DBAdapter mDBConnection;

 
 
 /**
  * Constructor 
  * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
  * @param context
  */
 private DBAdapter(Context context) {
  super(context, DB_NAME, null, 1);
  this.myContext = context;
  DB_PATH = "/data/data/"
    + context.getApplicationContext().getPackageName()
    + "/databases/";
  // The Android's default system path of your application database is
  // "/data/data/mypackagename/databases/"
  //context.getApplicationContext().getPackageName()
 }
 
 /**
  * getting Instance
  * @param context
  * @return DBAdapter
  */
 public static synchronized DBAdapter getDBAdapterInstance(Context context) {
  if (mDBConnection == null) {
   mDBConnection = new DBAdapter(context);
  }
  return mDBConnection;
 }

 /**
  * Creates an empty database on the system and rewrites it with your own database.
  **/
 public void createDataBase() throws IOException {
  boolean dbExist = checkDataBase();
  if (dbExist) {
   // do nothing - database already exist
  } else {
   // By calling following method 
   // 1) an empty database will be created into the default system path of your application 
   // 2) than we overwrite that database with our database.
   this.getWritableDatabase();
   try {
    copyDataBase();
   } catch (IOException e) {
    throw new Error("Error copying database");
   // throw new RuntimeException(e);
   }
   
   
   try {
           copyDataBase();
       } catch (IOException e) {

           throw new Error(e.getMessage());

       }

  }
 }

 
   
 
 /**
  * Check if the database already exist to avoid re-copying the file each time you open the application.
  * @return true if it exists, false if it doesn't
  */
 private boolean checkDataBase() {
  SQLiteDatabase checkDB = null;
  try {
   String myPath = DB_PATH + DB_NAME;
   checkDB = SQLiteDatabase.openDatabase(myPath, null,
     SQLiteDatabase.OPEN_READONLY);

  } catch (SQLiteException e) {
   // database does't exist yet.
  }
  if (checkDB != null) {
   checkDB.close();
  }
  return checkDB != null ? true : false;
 }

 /**
  * Copies your database from your local assets-folder to the just created
  * empty database in the system folder, from where it can be accessed and
  * handled. This is done by transfering bytestream.
  * */
 private void copyDataBase() throws IOException {
      // Open your local db as the input stream
  InputStream myInput = myContext.getAssets().open(DB_NAME);
      // Path to the just created empty db
  String outFileName = DB_PATH + DB_NAME;
      // Open the empty db as the output stream
  OutputStream myOutput = new FileOutputStream(outFileName);
      // transfer bytes from the inputfile to the outputfile
  byte[] buffer = new byte[1024];
  int length;
  while ((length = myInput.read(buffer)) > 0) {
   myOutput.write(buffer, 0, length);
  }
      // Close the streams
  myOutput.flush();
  myOutput.close();
  myInput.close();
 }
 
 /**
  * Open the database
  * @throws SQLException
  */
 public void openDataBase() throws SQLException {
  String myPath = DB_PATH + DB_NAME;
  myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);  
 }

 /**
  * Close the database if exist
  */
 @Override
 public synchronized void close() {
  if (myDataBase != null)
   myDataBase.close();
  super.close();
 }

 /**
  * Call on creating data base for example for creating tables at run time
  */
 @Override
 public void onCreate(SQLiteDatabase db) {
 }

 /**
  * can used for drop tables then call onCreate(db) function to create tables again - upgrade
  */
 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
 }

 // ----------------------- CRUD Functions ------------------------------
 
 /**
  * This function used to select the records from DB.
  * @param tableName
  * @param tableColumns
  * @param whereClase
  * @param whereArgs
  * @param groupBy
  * @param having
  * @param orderBy
  * @return A Cursor object, which is positioned before the first entry.
  */
 public Cursor selectRecordsFromDB(String tableName, String[] tableColumns,
   String whereClase, String whereArgs[], String groupBy,
   String having, String orderBy) {
  return myDataBase.query(tableName, tableColumns, whereClase, whereArgs,
    groupBy, having, orderBy);
 }
 
 /**
  * select records from db and return in list
  * @param tableName
  * @param tableColumns
  * @param whereClase
  * @param whereArgs
  * @param groupBy
  * @param having
  * @param orderBy
  * @return ArrayList<ArrayList<String>>
  */
 public ArrayList<ArrayList<String>> selectRecordsFromDBList(String tableName, String[] tableColumns,
   String whereClase, String whereArgs[], String groupBy,
   String having, String orderBy) {  
  
   ArrayList<ArrayList<String>> retList = new ArrayList<ArrayList<String>>();
       ArrayList<String> list = new ArrayList<String>();
       Cursor cursor = myDataBase.query(tableName, tableColumns, whereClase, whereArgs,
     groupBy, having, orderBy);        
       if (cursor.moveToFirst()) {
          do {
           list = new ArrayList<String>();
           for(int i=0; i<cursor.getColumnCount(); i++){            
            list.add( cursor.getString(i) );
           }  
           retList.add(list);
          } while (cursor.moveToNext());
       }
       if (cursor != null && !cursor.isClosed()) {
          cursor.close();
       }
      
       return retList;

 } 

 /**
  * This function used to insert the Record in DB. 
  * @param tableName
  * @param nullColumnHack
  * @param initialValues
  * @return the row ID of the newly inserted row, or -1 if an error occurred
  */
 public long insertRecordsInDB(String tableName, String nullColumnHack,
   ContentValues initialValues) {
  return myDataBase.insert(tableName, nullColumnHack, initialValues);
 }

 /**
  * This function used to update the Record in DB.
  * @param tableName
  * @param initialValues
  * @param whereClause
  * @param whereArgs
  * @return true / false on updating one or more records
  */
 public boolean updateRecordInDB(String tableName,
   ContentValues initialValues, String whereClause, String whereArgs[]) {
  return myDataBase.update(tableName, initialValues, whereClause,
    whereArgs) > 0;    
 }
 
 /**
  * This function used to update the Record in DB.
  * @param tableName
  * @param initialValues
  * @param whereClause
  * @param whereArgs
  * @return 0 in case of failure otherwise return no of row(s) are updated
  */
 public int updateRecordsInDB(String tableName,
   ContentValues initialValues, String whereClause, String whereArgs[]) {
  return myDataBase.update(tableName, initialValues, whereClause, whereArgs);  
 }

 /**
  * This function used to delete the Record in DB.
  * @param tableName
  * @param whereClause
  * @param whereArgs
  * @return 0 in case of failure otherwise return no of row(s) are deleted.
  */
 public int deleteRecordInDB(String tableName, String whereClause,
   String[] whereArgs) {
  return myDataBase.delete(tableName, whereClause, whereArgs);
 }

 // --------------------- Select Raw Query Functions ---------------------
 
 /**
  * apply raw Query
  * @param query
  * @param selectionArgs
  * @return Cursor
  */
 public Cursor selectRecordsFromDB(String query, String[] selectionArgs) {
  return myDataBase.rawQuery(query, selectionArgs);  
 }
 
 /**
  * apply raw query and return result in list
  * @param query
  * @param selectionArgs
  * @return ArrayList<ArrayList<String>>
  */
 public ArrayList<ArrayList<String>> selectRecordsFromDBList(String query, String[] selectionArgs) {       
       ArrayList<ArrayList<String>> retList = new ArrayList<ArrayList<String>>();
       ArrayList<String> list = new ArrayList<String>();
       Cursor cursor = myDataBase.rawQuery(query, selectionArgs);         
       if (cursor.moveToFirst()) {
          do {
           list = new ArrayList<String>();
           for(int i=0; i<cursor.getColumnCount(); i++){            
            list.add( cursor.getString(i) );
           }  
           retList.add(list);
          } while (cursor.moveToNext());
       }
       if (cursor != null && !cursor.isClosed()) {
          cursor.close();
       }
       return retList;
    }
  
}

Now just change <database.sqlite> with your database.
Now you can try to send the data by clicking the sync button, data will be synced to Mysql  databse

You can download the code to access sqlite from Here