在更新现有记录时将重复记录创建到SQLite数据库中

Question

在我的程序中，我使用SQLite数据库来存储数据，同时也允许用户更新现有记录。

我的代码帮助我更新现有记录，但是它创建了带有更新记录的重复条目，例如：如果更新任何记录7次，那么它为具有更新数据的相同更新记录创建7个条目。

在活动中使用以下代码行： -

           saveStatus = myDb.UpdateData(
                editImage.getText().toString(),
                editPersonName.getText().toString());

数据库类代码： -

public long UpdateData(String strImageName, String strPersonName){
    // TODO Auto-generated method stub

        try {
            SQLiteDatabase db;
            db = this.getWritableDatabase(); // Write Data

            ContentValues Val = new ContentValues();
            Val.put("ImageName", strImageName);
            Val.put("PersonName", strPersonName);

            long rows = db.update(TABLE_MEMBER, Val, "ImageName=?",
                    new String[] { String.valueOf(strImageName) });

            db.close();
            return rows; // return rows updated.

        } catch (Exception e) {
            return -1;
        }   
    }

整个代码：

@Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        // Create Table Name
        db.execSQL("CREATE TABLE " + TABLE_MEMBER + 
                  "(ImageName VARCHAR(100)," +
                  " PersonName VARCHAR(100));");

        Log.d("CREATE TABLE","Create Table Successfully - classs");
    }

    // Insert Data
    public long InsertData(String strImageName, String strPersonName) {
        // TODO Auto-generated method stub

         try {
            SQLiteDatabase db;
            db = this.getWritableDatabase(); // Write Data

            ContentValues Val = new ContentValues();
            Val.put("ImageName", strImageName); 
            Val.put("PersonName", strPersonName);

            long rows = db.insert(TABLE_MEMBER, null, Val);

            db.close();
            return rows; // return rows inserted.

         } catch (Exception e) {
            return -1;
         }
    }

    // Update Data
    public long UpdateData(String strImageName, String strPersonName){
    // TODO Auto-generated method stub

        try {
            SQLiteDatabase db;
            db = this.getWritableDatabase(); // Write Data

            ContentValues Val = new ContentValues();
            Val.put("ImageName", strImageName);
            Val.put("PersonName", strPersonName);

            long rows = db.update(TABLE_MEMBER, Val, "ImageName=?",
                    new String[] { String.valueOf(strImageName) });

            db.close();
            return rows; // return rows updated.

        } catch (Exception e) {
            return -1;
        }   
    }

    // Fetch data
    public String[] SelectData(String strImageName) {
        // TODO Auto-generated method stub

         try {
            String arrData[] = null;    

             SQLiteDatabase db;
             db = this.getReadableDatabase(); // Read Data

             Cursor cursor = db.query(TABLE_MEMBER, new String[] { "*" }, 
                        "ImageName=?",
                        new String[] { String.valueOf(strImageName) }, null, null, null, null);

                if(cursor != null)
                {
                    if (cursor.moveToFirst()) {
                        arrData = new String[cursor.getColumnCount()];

                        arrData[0] = cursor.getString(0);
                        arrData[1] = cursor.getString(1);
                    }
                }
                cursor.close();
                db.close();
                return arrData;

         } catch (Exception e) {
            return null;
         }
    }

    // Check for data(s) using ImageName field
    public boolean Exists(String strImageName) {
           SQLiteDatabase db;
           db = this.getReadableDatabase(); // Read Data
           Cursor cursor = db.rawQuery("select 1 from DataTable where ImageName= ?", 
                new String[] { strImageName });
           boolean exists = (cursor.getCount() > 0);
           cursor.close();
           return exists;
    }


    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_MEMBER);
        // Re Create on method  onCreate
        onCreate(db);
    }