ANDROID/SQLite Rechercher un enregistrement

Question

Je développe une application de vérification des symptômes. Mon application a une listview avec la case à cocher (de android.R.layout.simple_list_item_multiple_choice).

Après avoir vérifié les symptômes suivants et cliqué sur le bouton DONE, l'application doit afficher les conditions possibles que l'utilisateur peut avoir. Les informations sont déjà stockées dans ma base de données SQLite préconfigurée. Pour votre information, s'il vous plaît se référer à cette capture d'écran:

C'est ce que j'ai jusqu'à présent: (Symptoms.java)

 public void onClick(View v) { 
    // TODO Auto-generated method stub 

    /*Intent i = new Intent(this, SymptomsResult.class); 
    startActivity(i); 
    finish();*/ 

    dbHelper = new DBHelper(this); 
     dbHelper.openDataBase(); 

     String c = dbHelper.getData(); 

    String selected = ""; 
    int cntChoice = lv.getCount(); 

    SparseBooleanArray sparseBooleanArray = lv.getCheckedItemPositions(); 

    for(int i = 0; i < cntChoice; i++){ 

     if(sparseBooleanArray.get(i)) { 
      selected += lv.getItemAtPosition(i).toString() + "\n"; 
     } 

    } 

    c.equals(selected); 

    dbHelper.close(); 


    Toast.makeText(this, selected, Toast.LENGTH_LONG).show();  

} 

DBHelper.java

 public class DBHelper extends SQLiteOpenHelper{ 

//The Android's default system path of your application database. 
private static String DB_PATH = "/data/data/com.fps.myheartfirst/databases/"; 
private static String DB_NAME = "mhfDB"; 
private static String KEY_CONDITIONS = "conditions"; 
private static String KEY_SYMPTOMS = "symptoms"; 
private static String DB_TABLE = "tblSymptoms"; 
private SQLiteDatabase myDataBase; 
private final Context myContext; 

/** 
* Constructor 
* Takes and keeps a reference of the passed context in order to access to the application assets and resources. 
* @param context 
*/ 

public DBHelper(Context context) { 
    super(context, DB_NAME, null, 1); 
    this.myContext = context; 
} 

/** 
* Creates a empty database on the system and rewrites it with your own database. 
* */ 

public void createDataBase() throws IOException{ 

    boolean dbExist = checkDataBase(); 

    myDataBase = null; 

    if (dbExist) { 
      // do nothing - database already exist 
     } else { 

      // By calling this method and empty database will be created into 
      // the default system path 

      myDataBase = this.getReadableDatabase(); 
      myDataBase.close(); 


     try { 
      copyDataBase(); 
     } catch (IOException e) { 
      throw new Error("Error copying database"); 
     } 
    } 
} 

/** 
* 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 doesn'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(); 

} 

public void openDataBase() throws SQLException{ 
    //Open the database 
    String myPath = DB_PATH + DB_NAME; 
    myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS | SQLiteDatabase.OPEN_READONLY); 
} 

@Override 
public synchronized void close() { 
    if(myDataBase != null) 
     myDataBase.close(); 
    super.close(); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
} 

public String getData() { 

    String search = ""; 

    Cursor c = myDataBase.rawQuery("SELECT " + KEY_CONDITIONS + " FROM " + DB_TABLE + 
      " WHERE " + KEY_SYMPTOMS + " = '" 
    + search + "'", null); 
      //new String[] { name }, null, null, null); 

    int iRow = c.getColumnIndex(KEY_CONDITIONS); 

    for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
     search = search + c.getString(iRow); 
    } 

    return search; 

} 

Mon problème est que, comment puis-je mettre la requête String pour mes symptômes c fille? Je suis un peu nouveau à la programmation de base de données alors je vous demande pardon.

Je crois en cette ligne que je dois mettre quelque chose:

c.equals(selected); 

    dbHelper.close(); 


    Toast.makeText(this, selected, Toast.LENGTH_LONG).show(); 

donc un toast sera affiché à l'utilisateur pour afficher les conditions possibles. Est-ce que quelqu'un ici sait comment accomplir cela? J'apprécierais votre aide. Merci.

Answer 1

public String getData(String search) { 

Cursor c = myDataBase.query("SELECT " + KEY_CONDITIONS + " FROM " + DB_TABLE + 
     " WHERE " + KEY_SYMPTOMS + " = '" 
+ search + "'", null); 

Cursor c = myDataBase.query(DB_TABLE ,KEY_SYMPTOMS+ " = ?",new String[]{search},null,null,null); 


int iRow = c.getColumnIndex(KEY_CONDITIONS); 

for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { 
    search = search + c.getString(iRow); 
} 

return search; 

} 

passer le mot de recherche getData() méthode

Answer 2

Modifier la méthode getData comme indiqué ci-dessous -

public String getData(String [] symptoms) { 
    String search = null; 
    Cursor c = myDataBase.query(DB_TABLE, new String [] {KEY_CONDITIONS}, KEY_SYMPTOMS + "= ? ", symptoms, null, null, null); 

    c.moveToFirst(); 

    while (c.isAfterLast() == false) { 
     search = "" + c.getString(0); 
     c.moveToNext(); 
    } 

    return search; 

} 

Et dans les Symptômes classe - changer le onClick comme -

public void onClick(View v) { 

    ArrayList<String> alSymptoms = new ArrayList<String>(); 


    dbHelper = new DBHelper(this); 

    try { 

     dbHelper.createDataBase(); 

    } catch (IOException ioe) { 

     throw new Error("Unable to create database"); 

    } 

    try { 

     dbHelper.openDataBase(); 

    } catch (SQLException sqle) { 

     throw sqle; 

    } 



    String selected = ""; 

    int cntChoice = lv.getCount(); 

    SparseBooleanArray sparseBooleanArray = lv.getCheckedItemPositions(); 

    for (int i = 0; i < cntChoice; i++) { 

     if (sparseBooleanArray.get(i)) { 

      //Log.i("Selected", lv.getItemAtPosition(i).toString()); 
      //selected += lv.getItemAtPosition(i).toString() + "\n"; 
      alSymptoms.add(lv.getItemAtPosition(i).toString()); 
     } 

    } 
    String [] symptoms = alSymptoms.toArray(new String[alSymptoms.size()]); 

    String c = dbHelper.getData(symptoms); 

    Toast.makeText(this, c, Toast.LENGTH_LONG).show(); 

    dbHelper.close(); 
}