列「名」不存在

Question

IM開發一個應用程序，我也碰到這樣的問題，我所做的一切和，但仍然沒有解決，它包含一個error = "column 'name' does not exist" 如果可能的話給我一些提示，以解決這個問題 我刪除電話中的數據庫也， 請幫助我提前感謝 。

public class DataBaseBON { 
     String TAG; 
     private Context ourContext; 
     private dbhelper ourhelper; 
     private SQLiteDatabase ourdatabase; 
     public final static String KEY_ID= "_id"; 
     public final static String KEY_NUMBER="blockednumbers"; 
     public final static String N_NAME="name"; 
     public final static String DATABASE_NAME="databasebon.db";   
     public final static String DATABASE_TABLE="tabledb"; 
     public final static int DATABASE_VERSION=2; 
     private static final String DATABASE_CREATE = "create table " 
       + DATABASE_TABLE + "(" + KEY_ID 
       + " integer primary key autoincrement, " 
       + N_NAME + " text not null," 
       + KEY_NUMBER 
       + " text not null);"; 


     public class dbhelper extends SQLiteOpenHelper{ 

      public dbhelper(Context context) { //? 
      super(context, DATABASE_NAME, null, DATABASE_VERSION); 

     } 

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

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

     } 

     public DataBaseBON(Context c){ 

      ourContext =c ; 
     } 

     public DataBaseBON open() throws SQLException{ 
      ourhelper = new dbhelper(ourContext); 
      ourdatabase = ourhelper.getWritableDatabase(); 
      ourdatabase=ourhelper.getReadableDatabase(); 
      return this; 
     } 

     public void close(){ 
      ourhelper.close(); 
     } 

     public long creatEntry(String inputnumber , String name) { 
     // TODO Auto-generated method stub 
     ContentValues cv= new ContentValues(); 
     cv.put(KEY_NUMBER, inputnumber); 
     cv.put(N_NAME, name); 
     Log.v(inputnumber, "adding to Database"); 
     return ourdatabase.insert(DATABASE_TABLE, null, cv); 

    } 


     public Cursor getcursor() { 

     String[] columns = new String[]{ N_NAME, KEY_NUMBER }; 
     Cursor c=ourdatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); 
     return c;} 


    public String[] getcloumns() { 

     String[] columns = new String[]{ N_NAME, KEY_NUMBER }; 

     return columns ; 
    } 

    public int[] getto() { 
     String TAG = null; 
     int[] to = new int[] { android.R.id.text1, android.R.id.text2 }; 
     Log.v(TAG, "get to is ok"); 
     return to ; 
    } 
    public String[] getdata3(String[] result) { 
     String TAG = null; 
     String[] columns = new String[]{ N_NAME, KEY_NUMBER }; 
     Cursor c=ourdatabase.query(DATABASE_TABLE, columns, null, null, null, null, null); 
     int iRow = c.getColumnIndex(N_NAME); 
     int iName = c.getColumnIndex(KEY_NUMBER); 
     for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){ 
     @SuppressWarnings("unused") 
     String[] result1= new String[] {c.getString(iName),c.getString(iRow)}; 
     Log.v(TAG, "is ok"); 
     } 

     return result; 

      } 

錯誤：

11-25 23:49:33.633: E/AndroidRuntime(4072): java.lang.RuntimeException: Unable to startactivity 
ComponentInfo{vahid.engineer.com/vahid.engineer.com.BlackNumbersBlockDb}: 
      java.lang.IllegalArgumentException: column 'name' does not exist 

Answer 1

您需要在dbhelper

this.db = this.getWritableDatabase(); 

否則的onCreate不會被調用這條線。請注意，你需要一個「數據庫DB」變量太多

http://www.finalconcept.com.au/article/view/android-creating-a-sqlite-database

Answer 2

來得有點晚，但總好過從來沒有我有這樣的問題，我使用的內容提供商，所以當你在投影表的屬性的任何屬性不投影將不會顯示在基本uri上，以糾正該問題投影表的所有屬性projectionMap.put(Tablename.Attribute1, Tablename.Attribute1) ;