相关疑难解决方法(0)

是否可以在sqlite中的单个语句中更改表添加MULTIPLE列？以下不起作用.

alter table test add column mycolumn1 text, add column mycolumn2 text;

如何在现有表 LOGIN 中添加列。这是我的示例代码。

这是我的 DataBaseAdapter 类：

public class DataBaseHelper extends SQLiteOpenHelper
{
    public DataBaseHelper(Context context, String name,CursorFactory factory, int version) 
    {
               super(context, name, factory, version);
    }
    // Called when no database exists in disk and the helper class needs
    // to create a new one.
    @Override
    public void onCreate(SQLiteDatabase _db) 
    {
            _db.execSQL(LoginDataBaseAdapter.DATABASE_CREATE);

    }
    // Called when there is a database version mismatch meaning that the version
    // of the database on disk needs to be upgraded to the current version. …