CRUD：我找到`（）`在一個SQLite實現功能永遠不會執行

Question

在一個小應用程序，它可以攔截短信和將它們保存在本地數據庫中， 我想實現我的DAO一個find方法。

這是我所有的CRUD代碼：

public class CSmsReceiverDAO implements IDAO<CSmsReceived> { 
    private SQLiteDatabase bdd; 
    private CMaBaseSQLite cMaBaseSQLite; 
    private static final String NOM_BDD = "sms.db"; 
    private static final int VERSION_BDD = 1; 

    private static final String COL_ID = "ID"; 
    private static final int NUM_COL_ID = 0; 

    private static final String TABLE_SMS_SENT = "table_sms_sent"; 
    private static final String COL_DateSending = "dateSending"; 

    private static final String TABLE_SMS_RECEIVED = "table_sms_received"; 
    private static final String COL_DateReceiving = "dateReceiving"; 

    private static final int NUM_COL_DateReceiving = 1; 

    private static final String COL_PROCESSED ="processed"; 
    private static final int NUM_COL_PROCESSED = 2; 

    private static final String COL_PHONE ="phone"; 
    private static final int NUM_COL_PHONE= 3; 

    private static final String COL_DATA ="data"; 
    private static final int NUM_COL_DATA= 4; 


    public CSmsReceiverDAO(Context context){ 
     //On créer la BDD et sa table 
     cMaBaseSQLite = new CMaBaseSQLite(context, NOM_BDD, null, VERSION_BDD); 
    } 

    public void open(){ 
     //on ouvre la BDD en écriture 
     bdd = cMaBaseSQLite.getWritableDatabase(); 
    } 

    public void close(){ 
     //on ferme l'accès à la BDD 
     bdd.close(); 
    } 

    public SQLiteDatabase getBDD(){ 
     return bdd; 
    } 

    @Override 
    public CSmsReceived find(String date) throws Exception { 
     //Récupère dans un Cursor les valeur correspondant à un livre contenu dans la BDD (ici on sélectionne le livre grâce à son titre) 
     Cursor c = bdd.query(TABLE_SMS_RECEIVED, new String[] {COL_ID, COL_DateReceiving, COL_PROCESSED, COL_PHONE, COL_DATA}, COL_DateReceiving + " LIKE \"" + date +"\"", null, null, null, null); 
     return cursorToSms(c); 
    } 

    @Override 
    public List<CSmsReceived> findAll() throws Exception { 
     return null; 
    } 

    @Override 
    public void persist(CSmsReceived t) throws Exception { 

     //Création d'un ContentValues (fonctionne comme une HashMap) 
     ContentValues values = new ContentValues(); 
     //on lui ajoute une valeur associé à une clé (qui est le nom de la colonne dans laquelle on veut mettre la valeur) 
     values.put(t.getDateReceiving(), NUM_COL_DateReceiving); 
     values.put(t.getProcessed(), NUM_COL_PROCESSED); 
     values.put(t.getPhone(), NUM_COL_PHONE); 
     values.put(t.getData(), NUM_COL_DATA); 

     //on insère l'objet dans la BDD via le ContentValues 
     bdd.insert(TABLE_SMS_RECEIVED, null, values); 
    } 

    @Override 
    public void remove(CSmsReceived t) throws Exception { 

    } 

    @Override 
    public void update(CSmsReceived s, CSmsReceived t) throws Exception { 

    } 

    @Override 
    public void refresh(CSmsReceived t) throws Exception { 

    } 

    //Cette méthode permet de convertir un cursor en un sms 
    private CSmsReceived cursorToSms(Cursor c){ 
     //si aucun élément n'a été retourné dans la requête, on renvoie null 
     if (c.getCount() == 0) 
      return null; 

     //Sinon on se place sur le premier élément 
     c.moveToFirst(); 
     //On créé un sms 
     //on lui affecte toutes les infos grâce aux infos contenues dans le Cursor 
     CSmsReceived cSmsReceived = new CSmsReceived.SmsReceivedBuilder() 
       .DateReceiving(c.getString(NUM_COL_DateReceiving)) 
       .Processed(c.getString(NUM_COL_PROCESSED)).Phone(c.getString(NUM_COL_PHONE)) 
       .Data(c.getString(NUM_COL_DATA)).build(); 
     //On ferme le cursor 
     c.close(); 

     //On retourne le livre 
     return cSmsReceived; 
    } 
} 

我的SQL基本代碼：

public class CMaBaseSQLite extends SQLiteOpenHelper { 

    private static final String COL_ID = "ID"; 

    private static final String TABLE_SMS_SENT = "table_sms_sent"; 
    private static final String COL_DateSending = "dateSending"; 

    private static final String TABLE_SMS_RECEIVED = "table_sms_received"; 
    private static final String COL_DateReceiving = "dateReceiving"; 
    private static final String COL_PROCESSED ="processed"; 

    private static final String COL_PHONE ="phone"; 
    private static final String COL_DATA ="data"; 

    private static final String CREATE_BDD_SMS_RECEIVED = "CREATE TABLE " + TABLE_SMS_RECEIVED + " (" 
      + COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_DateReceiving + "TEXT, " 
      + COL_PROCESSED + "TEXT, " + COL_PHONE + "TEXT, " + COL_DATA + "TEXT);"; 

    private static final String CREATE_BDD_SMS_SENT = "CREATE TABLE " + TABLE_SMS_SENT + " (" 
      + COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_DateSending + "TEXT, " 
      + COL_PHONE + "TEXT, " + COL_DATA + "TEXT NOT NULL);"; 

    public CMaBaseSQLite(Context context, String name, CursorFactory factory, int version) { 
     super(context, name, factory, version); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     //on créé la table à partir de la requête écrite dans la variable CREATE_BDD sent et received 
     db.execSQL(CREATE_BDD_SMS_RECEIVED); 
     //db.execSQL(CREATE_BDD_SMS_SENT); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     //On peut fait ce qu'on veut ici moi j'ai décidé de supprimer la table et de la recréer 
     //comme ça lorsque je change la version les id repartent de 0 
     //db.execSQL("DROP TABLE " + TABLE_SMS_SENT + ";"); 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_SMS_RECEIVED + ";"); 
     onCreate(db); 
    } 

這是我的活動：

CSmsReceiverDAO cSmsReceiverDAO = new CSmsReceiverDAO(this); 
CSmsReceived SmsReceived1 = new CSmsReceived.SmsReceivedBuilder() 
     .Data("coords XY").DateReceiving("janvier").Phone("+33565456").Processed("zz").build(); 

cSmsReceiverDAO.open(); 

try { 
    Log.i("test","try ok"); 
    cSmsReceiverDAO.persist(SmsReceived1); 
    Log.i("test", "persist ok"); 
    CSmsReceived smsFromBdd = cSmsReceiverDAO.find(SmsReceived1.getDateReceiving()); 
    Log.i("test", "find ok"); 

    if (smsFromBdd !=null){ 
     Toast.makeText(this, smsFromBdd.toString(), Toast.LENGTH_LONG).show(); 
    } 
    else { 
     Toast.makeText(this, "persist fail...", Toast.LENGTH_LONG).show(); 

    } 

} catch (Exception e) { 
    e.printStackTrace(); 
} 

在我的日誌，查找方法是從未執行過，但我不明白爲什麼。

02-14 17:25:09.460 7571-7571/com.dev.boblinux.cador I/test: try ok 
02-14 17:25:09.470 7571-7571/com.dev.boblinux.cador I/test: persist ok 

編輯：感謝Hrundi五巴克什：現在

我的日誌：

try ok persist ok find ok

但並沒有什麼對我smsFromBdd：

 `if (smsFromBdd !=null){ 
      Toast.makeText(this, smsFromBdd.toString(), Toast.LENGTH_LONG).show(); 
     } 
     else { 
      Toast.makeText(this, "persist fail...", Toast.LENGTH_LONG).show(); 

     }` 

顯示persist fail...

Answer 1

你是不是從他們的類型分離的字段名。
因此，表格格式不正確。
和執行cSmsReceiverDAO.find()

當您的應用程序中止需要空間中的字段名和字段類型之間。

private static final String CREATE_BDD_SMS_RECEIVED = "CREATE TABLE " + TABLE_SMS_RECEIVED + " (" 
     + COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_DateReceiving + " TEXT, " 
     + COL_PROCESSED + " TEXT, " + COL_PHONE + " TEXT, " + COL_DATA + " TEXT);"; 

private static final String CREATE_BDD_SMS_SENT = "CREATE TABLE " + TABLE_SMS_SENT + " (" 
     + COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_DateSending + " TEXT, " 
     + COL_PHONE + " TEXT, " + COL_DATA + " TEXT NOT NULL);"; 

然後，您需要卸載您的應用程序並重新運行它，以便重新創建數據庫。