에러 없이 잘 돌아가는데 뭐가 문제인지 잘 모르겠습니다.분명히 DB파일도 생성되었구요.
일단 c.getCount가 무조건 0이 나오네요 ;;
아~ 그리고 DB를 외부에서 메모장등으로도 열어볼수 있나요?? 시도해봤는데 이상한 언어만 나오드라구요
 
<메인 액티비티 onCreate안>
 this.gdb=new GroupDBHelper(this);
     gdb.open();
     gdb.insert("새폴더", item.ISBN);
     int a=gdb.getCount("새폴더"); // 여기서 a값이 0이 나오네요 ;; insert가 잘 안되는건지;;
 
<DB 어댑터>
public class GroupDBHelper {
 public static final String KEY_NAME="name";
 public static final String KEY_ISBN="ISBN";
 public static final String KEY_ID="_id";
 
 public static final String DB_NAME="RM_DB.db";
 public static final String DB_TABLE="GROUP";
 public static final int DB_VERSION=1;
 
 private static final String ClassName=GroupDBHelper.class.getSimpleName();
 private static final String[] COLS=new String[]{
  KEY_ID,KEY_NAME,KEY_ISBN };
 
 public static final String DB_CREATE="create table "+DB_TABLE+" (_id integer primary key autoincrement,"+
 "name text not null, ISBN text not null);";
 
 private SQLiteDatabase db;
 private DBOpenHelper dbOpenHelper;
 
 private final Context mCtx;
 
 private class DBOpenHelper extends SQLiteOpenHelper{
  
  public DBOpenHelper(Context context){
   super(context,GroupDBHelper.DB_NAME,null,GroupDBHelper.DB_VERSION);
  }
  @Override
  public void onCreate(SQLiteDatabase db) {
   // TODO Auto-generated method stub
   try{
    db.execSQL(DB_CREATE);
   }catch(SQLException e)
   {
    Log.e("DB",GroupDBHelper.ClassName, e);
   }
  }
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVer, int newVer) {
   // TODO Auto-generated method stub
   db.execSQL("DROP TABLE IF EXISTS "+GroupDBHelper.DB_TABLE);
   this.onCreate(db);
  }
 }
     
 // end inner class
 
 public GroupDBHelper(Context context){
  this.mCtx=context;
 }
 public GroupDBHelper open()throws SQLException{
  dbOpenHelper=new DBOpenHelper(mCtx);
  db=dbOpenHelper.getWritableDatabase();
  return this;
 }
 public void cleanup(){
  if(this.db!=null){
   this.db.close();
   this.db=null;
  }
 }
 public void insert(String name,String ISBN){
  ContentValues values=new ContentValues();
  values.put(KEY_NAME, name);
  values.put(KEY_ISBN,ISBN);
  this.db.insert(GroupDBHelper.DB_TABLE, null, values);
 }
 public void update(long id,String name,String ISBN){
  ContentValues values=new ContentValues();
  values.put(KEY_NAME, name);
  values.put(KEY_ISBN,ISBN);
  this.db.update(GroupDBHelper.DB_TABLE, values, KEY_ID+"="+id, null);
 }
 
 public void delete(long id){
  this.db.delete(GroupDBHelper.DB_TABLE, KEY_ID+"="+id, null);
 }
 public int getCount(String name){
  Cursor c=null;
  int count=0;
  try{
   c=this.db.query(true, GroupDBHelper.DB_TABLE, GroupDBHelper.COLS, KEY_NAME+"="+name,
     null, null, null,null,null);
   if(c.getCount()>0){
    count=c.getCount();
   }
  }catch(SQLException e){
   Log.v("DB", GroupDBHelper.ClassName, e);
  }finally{
   if(c!=null && !c.isClosed()){
    c.close();
   }
  }
  return count;
 }
 public ArrayList<String> getAllName(){
  ArrayList<String> arr=new ArrayList<String> ();
  Cursor c=null;
  try{
   c=this.db.query(GroupDBHelper.DB_TABLE, GroupDBHelper.COLS,
     null, null, null,null,null);
   int count=c.getCount();
   c.moveToFirst();
   for(int i=0;i<count;i++)
   {
    String str=c.getString(1);
    if(arr.contains(str)==false){
     arr.add(str);
    }
    c.moveToNext();
   }
  }catch(SQLException e){
   Log.v("DB", GroupDBHelper.ClassName, e);
  }finally{
   if(c!=null && !c.isClosed()){
    c.close();
   }
  }
  return arr;
 }
 public ArrayList<String> getISBN(String name){
  ArrayList<String> arr=new ArrayList<String> ();
  Cursor c=null;
  try{
   c=this.db.query(true, GroupDBHelper.DB_TABLE, GroupDBHelper.COLS, KEY_NAME+"="+name,
     null, null, null,null,null);
   if(c.getCount()>0){
    c.moveToFirst();
    int num=c.getCount();
    for(int i=0;i<num;i++)
    {
     if(name==c.getString(1))
     {
      arr.add(c.getString(2));
     }
     c.moveToNext();
    }
   }
  }catch(SQLException e){
   Log.v("DB", GroupDBHelper.ClassName, e);
  }finally{
   if(c!=null && !c.isClosed()){
    c.close();
   }
  }
  return arr;
 }
}