嘿,我一直在努力为我的大学的Android项目工作,但我坚持在这一点上。我想从表students
中提取所有行,将它们填充到ArrayList
中,然后使用ListView
或CardView
来显示每个学生的记录。这是我正在使用的代码:如何获取表SQLite中的所有行?
public ArrayList<String> getStudentsEntry()
{
ArrayList<String> arrayList = new ArrayList<>();
Cursor cursor = db.query("STUDENT", ALL_COLUMN_NAME, null, null, null, null, null);
if(cursor.getCount()<1) // UserName Not Exist
{
cursor.close();
return null;
}
cursor.moveToFirst();
while(cursor.isAfterLast()) {
String name = cursor.getString(cursor.getColumnIndex("NAME"));
String enrollment = cursor.getString(cursor.getColumnIndex("ENROLLMENT"));
String year = cursor.getString(cursor.getColumnIndex("YEAR"));
String dob = cursor.getString(cursor.getColumnIndex("DOB"));
String email = cursor.getString(cursor.getColumnIndex("EMAIL"));
String caste = cursor.getString(cursor.getColumnIndex("CASTE"));
String fname = cursor.getString(cursor.getColumnIndex("FNAME"));
String mname = cursor.getString(cursor.getColumnIndex("MNAME"));
String address = cursor.getString(cursor.getColumnIndex("ADDRESS"));
String contact = cursor.getString(cursor.getColumnIndex("CONTACT"));
arrayList.add(name);
arrayList.add(enrollment);
arrayList.add(year);
arrayList.add(dob);
arrayList.add(email);
arrayList.add(caste);
arrayList.add(fname);
arrayList.add(mname);
arrayList.add(address);
arrayList.add(contact);
}
return arrayList;
}
它没有返回任何东西。我无法从数据库中获取数据。数组大小为零:
Caused by: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0
在java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:25
请帮我家伙,我是新来的这个东东
这是一个不同恩方案有@ShreeKrishna ..我无法从数据库中检索数据.. –