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我创建了DBAdapter类负责与数据库建立连接并执行任何查询并最终关闭连接。Sqlite:构造函数未定义
我有它不会从活动类(ReminderBeep)继承了另一个类,但我用我将对DBAdapter这一类。
其实我也不知道我怎么能操纵将对DBAdapter构造进行连接*
的错误是:构造将对DBAdapter(ReminderBeep)是未定义
将对DBAdapter是:
public class DBAdapter {
static final String DATABASE_NAME = "MyDB";
static final int DATABASE_VERSION = 2;
final Context context;
DatabaseHelper DBHelper;
SQLiteDatabase db;
public DBAdapter(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
}
}
//---opens the database---
public DBAdapter open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
public void insert(String sql)
{
db.execSQL(sql);
}
}
BeepReminder是:
public class ReminderBeep
{
public void DeleteDailyActivities()
{
DBAdapter db=new DBAdapter(this);
db.open();
String sql="delete from DailyWorks";
db.insert(sql);
db.close();
}
}
是的,我知道,但因为是BeepReminde我不能使用_extends Activity_ – Salman
没有XML文件,应该比你重新考虑你的设计 – Blackbelt
待办事项你有任何想法的构造? – Salman