sqlite 관련 질문합니다.

Question

import java.io.File;
import java.util.ArrayList;
 
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Environment;
import android.provider.ContactsContract;
import android.util.Log;
 
public class DataBaseHelper {
  private DBHelper mHelper;
	private SQLiteDatabase db;
	private static final String Database_Name="account.db";
	private static final int Database_Version = 2;
	private static String SQL_Table_Create;
	private static String Table_Name;
	public static final String FILE_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + Database_Name;
 
	public static final String SQL_Create_accountdb =
			"create table accountdb (_id integer primary key autoincrement,"
					+"name text not null,"
					+"phone text not null"
					+")";
	private final Context cxt;
 
	private static class DBHelper extends SQLiteOpenHelper {
		DBHelper(Context context) {
			super(context,FILE_PATH,null,Database_Version);
		}
		@Override
		public void onCreate(SQLiteDatabase db) {
			db.execSQL(SQL_Create_accountdb);
		}
		@Override
		public void onOpen(SQLiteDatabase db) {
			super.onOpen(db);
		}
		@Override
		public void onUpgrade(SQLiteDatabase db, int i, int i2) {
			db.execSQL("DROP TABLE IF EXISTS " + Table_Name);
			onCreate(db);
		}
	}
	public DataBaseHelper(Context cxt, String sql, String tname){
		this.cxt=cxt;
		SQL_Table_Create=sql;
		Table_Name=tname;
	}
	public DataBaseHelper open() throws SQLiteException{
		mHelper = new DBHelper(cxt);
		db = mHelper.getWritableDatabase();
		return this;
	}
	public void close() {
		mHelper.close();
	}
	public long insertTable(ContentValues values) {
		return db.insert(Table_Name, null, values);
	}
	public boolean deleteTable(String pkColumn, long pkData) {
		return db.delete(Table_Name, pkColumn+"="+pkData, null)>0;
	}
	public Cursor RawQueryString(String sql){
		return db.rawQuery(sql,null);
	}
	public Cursor selectTable(String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) {
		return db.query(Table_Name, columns, selection, selectionArgs, groupBy, having, orderBy);
	}
	public boolean updateTable(ContentValues values, String pkColumn, long pkData) {
		return db.update(Table_Name, values, pkColumn+"="+pkData, null)>0;
	}
}

어플이 실행될 때 db가 account.db로 고정되는 것이 아니고 실행될 때마다 1.db, 2.db, 3.db 이런 식으로 바뀌게 하고 싶은데요

그래서 DBHelper(Context context) 부분에 SharedPreferences를 이용해서 하려고하는데 잘 안되네요.

 

DBHelper(Context context) {
			SharedPreferences pref = contextgetSharedPreferences("pref", context.MODE_PRIVATE);
			int now = pref.getInt("order", 0);
			String FILE_PATH=Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + now + ".db";
			SharedPreferences.Editor editor = pref.edit();
			editor.putInt("order", now+1);
			editor.commit();
			super(context,FILE_PATH,null,Database_Version);
		}

이런 식으로 고쳤보려고 했는데 잘 안되네요. 어떻게 해야할까요??