android - I have problems with Database inserting in eclispe -

i've created simple app student's name , save in database , if inserted , show toast otherwise show 'didn't work' toast. how can find out database saved?

here script codes:

student

public class student {      public string name;  } 

databasemanager

import android.content.context; import android.database.sqlite.sqlitedatabase; import android.database.sqlite.sqliteopenhelper;   public class databasemanager extends sqliteopenhelper {      public databasemanager(context context)     {         super(context, "mydata", null, 1);     }       @override     public void oncreate(sqlitedatabase arg0) {         // todo auto-generated method stub          string query = "create table tbl_student_info ( " +                 " name varchar( 10 )," +                 ");";         arg0.execsql(query);      }       @override     public void onupgrade(sqlitedatabase arg0, int arg1, int arg2) {         // todo auto-generated method stub          string query = " drop table if exists tbl_student_info ";          arg0.execsql(query);          oncreate(arg0);      }       public boolean addstudent(student student)     {         boolean result;          try         {             string query = "insert tbl_student_info (name, tel)" +                     " values ('" + student.name + "')";             sqlitedatabase db = this.getwritabledatabase();             db.execsql(query);             db.close();             result = true;          }         catch (exception ex)          {             result = false;          }         return result;     } 

mainactivity

import android.app.activity; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.toast;   public class testdatabasesimpletestactivity extends activity {      edittext edittext1;      button   button1;       @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);         settitle(" registry page ");          edittext1 = (edittext) findviewbyid(r.id.edittext1);          button1 = (button) findviewbyid(r.id.button1);          button1.setonclicklistener(new onclicklistener() {              @override             public void onclick(view arg0) {                  string name = edittext1.gettext().tostring();                  student student = new student();                  student.name = name;                 databasemanager db = new databasemanager(getapplicationcontext());                 boolean result = db.addstudent(student);                  if (result == true)                 {                     string s = "it works...";                     toast.maketext(getapplicationcontext(), s, toast.length_long).show();                 }                 else                 {                     string s = "did not works...";                     toast.maketext(getapplicationcontext(), s, toast.length_long).show();                 }             }         });     } 

main

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >       <textview         android:id="@+id/textview1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="name :" />      <edittext         android:id="@+id/edittext1"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:ems="10" >          <requestfocus />     </edittext>       <button         android:id="@+id/button1"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="insert" />  </linearlayout>