2015-02-07 237 views
1

當我嘗試訪問數據庫中的數據時,我的應用程序崩潰。我懷疑我沒有正確地將數據插入到數據庫中,下面是我使用的類和方法。Android SQLite錯誤:插入數據

public class MySQLiteHelper extends SQLiteOpenHelper { 

    private static final String DATABASE_NAME = "mydb.db"; 
    private static final int DATABASE_VERSION = 1; 

    public static final String TABLE_QUICK_STOP = "quick_stop"; 

    public static String[] QUICK_STOP_FIELDS = { 
     "_id", // autoincrement 
     "quick_stop_stop_id", // stop id 
     "quick_stop_name", 
     "quick_stop_types", // ex. 1111 or 0101. Underground Train Bus Ferry, used to filter some specific stations 
     "quick_stop_position" 
     //TODO should there be a "stop_name" here? 
    }; 

    private static final String DATABASE_CREATE = "create table " 
     + TABLE_QUICK_STOP + "(" 
     + QUICK_STOP_FIELDS[0] + " long primary key, " // id (same stop can be added multiple times with different filters) 
     + QUICK_STOP_FIELDS[1] + " integer not null, " // stop id 
     + QUICK_STOP_FIELDS[2] + " varchar not null, " // stop name 
     + QUICK_STOP_FIELDS[3] + " integer not null, " // stop types 
     + QUICK_STOP_FIELDS[4] + " integer not null);"; // stop position   array[4] = cursor.getInt(4); // stop position 

    public MySQLiteHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL(DATABASE_CREATE); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w(MySQLiteHelper.class.getName(), 
       "Upgrading database from version " + oldVersion + " to " 
         + newVersion + ", which will destroy all old data"); 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_QUICK_STOP); 
     onCreate(db); 
    } 
} 

而且我用這個插入:

public Boolean insertStop(int stopId, String name, int types, int position) { 
    ContentValues values = new ContentValues(); 
    values.put(MySQLiteHelper.QUICK_STOP_FIELDS[1], stopId); 
    values.put(MySQLiteHelper.QUICK_STOP_FIELDS[2], name); 
    values.put(MySQLiteHelper.QUICK_STOP_FIELDS[3], types); 
    values.put(MySQLiteHelper.QUICK_STOP_FIELDS[4], position); 
    long insertId = database.insert(MySQLiteHelper.TABLE_QUICK_STOP, null, values); 
    if(insertId == -1) 
     return false; 
    return true; 
} 

如前所述,Android的工作室是在提供信息,以便能夠調試可怕。

+0

您是否在第一次運行後改變了表格結構?如果是這樣,請將'DATABASE_VERSION = 1;'更改爲'DATABASE_VERSION = 2;'或更高的數字,以便啓動onUpgrade()。或者嘗試從'/ data/data/...'路徑中刪除數據庫,以便在下次運行時重新創建數據庫。 – 2015-02-07 20:11:52

+0

@DerGolem我改變了數據庫名稱,它的工作,所以你在你的評論是正確的。將其作爲答案陳述,我會接受! – 2015-02-07 20:19:09

+0

完成!有時候錯誤隱藏在明顯的視野中 – 2015-02-07 20:22:26

回答

1

您是否alter第一次運行後的表結構?

如果是這樣,請更改DATABASE_VERSION = 1; DATABASE_VERSION = 2;或更高的數字,以使onUpgrade()激活。

或者,也可以嘗試從/data/data/...路徑中刪除(或重命名)數據庫,以便在下次運行時重新創建該路徑。