SQLiteDatabase/DBUtils

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
public class DBUtils {
    private SQLiteDatabase db;

    public DBUtils(Context context){
        DBHelper dbHelper=new DBHelper(context,"ming.db",null,1);
        db=dbHelper.getWritableDatabase();
    }

    public void insert(String data){
        ContentValues values=new ContentValues();
        values.put("ming",data);
        db.insert("ming",null,values);
    }

    public String query(){
        String data="";
        Cursor cu = db.rawQuery("select ming from ming", null);
        while (cu.moveToNext()){
            data=cu.getString(cu.getColumnIndex("ming"));
        }
        return data;
    }
}