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package bdbuzz.android.com;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
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.util.Log;
public class DatabaseHelper extends SQLiteOpenHelper {
/**
* Intialisation des variables principales
*/
private static String DB_PATH = "/data/data/nom_de_mon_package/databases/";
private static String DB_NAME = "bdbuzz.sqlite";
private final Context myContext;
/**
* Num�ro de version de la DB.
* Si ce num�ro change, la fonction onUpgrade est ex�cut�e
* pour effacer le contenu de la DB et recr�er la nouvelle
* version du sch�ma.
*/
private static final int DATABASE_VERSION = 1;
/**
* Lien vers la session DB.
*/
private SQLiteDatabase db;
/**
* Nom de la table de la DB (oui une seule table).
*/
private static String TABLE_SERIES = "series";
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, DATABASE_VERSION);
//db = getWritableDatabase();
this.myContext = context;
try {
createDataBase();
//System.out.println("ok bd");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
//System.out.println("erreur bd");
}
}
/**
* Ex�cut� si la DB n'existe pas.
*/
@Override
public void onCreate(SQLiteDatabase db) {
//db.execSQL(CREATE_TABLE_SERIES);
//Toast.makeText(myContext, "La base est cr��", Toast.LENGTH_SHORT).show();
}
/**
* Ex�cut� chaque fois que le num�ro de version de DB change.
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
//db.execSQL("DROP TABLE IF EXISTS " + TABLE_SERIES);
//onCreate(db);
}
/**
* Charge le contenu de la table Livres
* et retourne ce contenu sous la forme d'une liste de NOM + " " + PRENOM;
*/
public ArrayList<HashMap<String, String>> getSeries() {
//Cr�ation de la ArrayList qui nous permettra de remplire la listView
ArrayList<HashMap<String, String>> output = new ArrayList<HashMap<String, String>>();
//On d�clare la HashMap qui contiendra les informations pour un item
HashMap<String, String> map;
String[] colonnesARecup = new String[] { "_id", "title", "category", "resume" };
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
Cursor cursorResults = db.query(TABLE_SERIES, colonnesARecup, null,
null, null, null, "title asc, category asc", null);
if (null != cursorResults) {
if (cursorResults.moveToFirst()) {
do {
map = new HashMap<String, String>();
map.put("_id", cursorResults.getString(cursorResults.getColumnIndex("_id")));
map.put("titre", cursorResults.getString(cursorResults.getColumnIndex("title")));
map.put("category", cursorResults.getString(cursorResults.getColumnIndex("category")));
map.put("resume", cursorResults.getString(cursorResults.getColumnIndex("resume")));
output.add(map);
} while (cursorResults.moveToNext());
} // end�if
}
cursorResults.close();
db.close();
return output;
}
/**
* 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.
Log.i("BDBUZZ","Erreur Bd"+e);
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
db = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
/**
* 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.
* */
public 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();
}
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
Log.i("BDBUZZ","Checkdatabase "+dbExist);
String DEBUG_TAG = "BDBUZZ";
if (dbExist) {
Log.i(DEBUG_TAG , "createDataBase -> La base existe");
// do nothing - database already exist
} else {
// By calling this method and empty database will be created into
// the default system path
// of your application so we are gonna be able to overwrite that
// database with our database.
Log.i("BDBUZZ","Avant getreadable");
this.getReadableDatabase();
Log.i("BDBUZZ","Apres getreadable");
Log.i(DEBUG_TAG, "else, db existiert nicht 1");
try {
copyDataBase();
Log.i(DEBUG_TAG, "nach copydatabase");
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
} |
[BDD-SQLITE]Exploitation de bdd existante
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