Android - ส่งตัวแปรเข้าไปในไฟล์ SQLiteOpenHelper ยังไงครับ ใช้ intent ไม่ได้

public class SearchActivity extends Activity {


	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_search);
		
		
		
	}
	

	public void search(View v){
		EditText search = (EditText) findViewById(R.id.txtSearch);
    	String txtS = search.getText().toString();
    	
    	
    	
    	Intent intent = new Intent(this, MyDBClass.class);
    	intent.putExtra("AA", txtS);
    	startActivity(intent);
    	
    	
    	final MyDBClass myDb = new MyDBClass(this);
		final ArrayList<HashMap<String, String>> MebmerList = myDb.SelectAllData();  
		

       
		
        // listView1
		
			
        ListView lisView1 = (ListView)findViewById(R.id.listView1); 
        
        SimpleAdapter sAdap;
        
        
      
        sAdap = new SimpleAdapter(SearchActivity.this, MebmerList, R.layout.activity_column,
        		new String[] {"MemberID", "Name", "Tel"}, new int[] {R.id.ColMemberID, R.id.ColName, R.id.ColTel});  
      	
        if(txtS.equals(sAdap)){
        lisView1.setAdapter(sAdap);
        
        
        	
        lisView1.setOnItemClickListener(new OnItemClickListener() {
		      public void onItemClick(AdapterView<?> myAdapter, View myView, int position, long mylng) {
		    	
		       	  
		       }
            
        });
        
        
        	
        }
}

public class MyDBClass extends SQLiteOpenHelper {

	Intent intent = getIntent();
	String txtS = intent.getStringExtra("AA");
	

	// Database Version
    private static final int DATABASE_VERSION = 1;
 
    // Database Name
    private static final String DATABASE_NAME = "mydatabase";
 
    // Table Name
    private static final String TABLE_MEMBER = "members";

	public MyDBClass(Context context) {
		super(context, DATABASE_NAME, null, DATABASE_VERSION);
		// TODO Auto-generated constructor stub
	}

	

	@Override
	public void onCreate(SQLiteDatabase db) {
		
		
		// TODO Auto-generated method stub
		// Create Table Name
	    db.execSQL("CREATE TABLE " + TABLE_MEMBER + 
		          "(MemberID INTEGER PRIMARY KEY AUTOINCREMENT," +
		          " Name TEXT(100)," +
		          " Tel TEXT(100));");
	   
	    Log.d("CREATE TABLE","Create Table Successfully.");
	}
	

	
	
	// Search All Data
		public ArrayList<HashMap<String, String>> SearchAllData() {

			// TODO Auto-generated method stub
	
			 try {
				
				 
					
				 ArrayList<HashMap<String, String>> MyArrList = new ArrayList<HashMap<String, String>>();
				 HashMap<String, String> map;
				 
				 SQLiteDatabase db;
				 db = this.getReadableDatabase(); // Read Data
					
				 String strSQL = "SELECT * FROM "+ TABLE_MEMBER +" WHERE Name like "+ txtS +" ORDER BY Tel"  ;
				 //Select MemberID from member where name like '%txtSearch%'
				 //"SELECT  * FROM " + TABLE_MEMBER
				 Cursor cursor = db.rawQuery(strSQL, null);
				 
				 	if(cursor != null)
				 	{
				 	    if (cursor.moveToFirst()) {
				 	        do {
				 	        	map = new HashMap<String, String>();
				 	        	map.put("MemberID", cursor.getString(0));
					 	        map.put("Name", cursor.getString(1));
					 	        map.put("Tel", cursor.getString(2));
					 	        MyArrList.add(map);
				 	        } while (cursor.moveToNext());
				 	    }
				 	}
				 	cursor.close();
				 	db.close();
					return MyArrList;
					
			 } catch (Exception e) {
			    return null;
			 }

		}
		
		
	
	



		
	
	

	@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);
	}

}