新手求助：安卓sql查找的函数，报错Nullpointerexception

Question

代码如下
public User search(String username){
SQLiteDatabase sdb = helper.getReadableDatabase();
Cursor cursor =sdb.rawQuery("select * from user where username=?", new String[]{username});

if(cursor.moveToFirst()){

String uname=cursor.getString(cursor.getColumnIndex("username"));

String pword=cursor.getString(cursor.getColumnIndex("password"));

User user=new User(uname,pword);
return user;

}

cursor.close();

return null;

}

Answer 1

cursor.moveToFirst()改为cursor.next() 记得应该是next()函数的样子