android 将map保存到sqlite数据库中，从表数据中取回map

下面将map保存到数据表中,下面的代码中忘记对 ois.close(); fis.close();

public boolean savemap(HashMap info) { String sql = ""; try { ByteArrayOutputStream fis = new ByteArrayOutputStream(); ObjectOutputStream ois = new ObjectOutputStream(fis); ois.writeObject(info); byte[] tbyte2 = fis.toByteArray(); sql = "insert into t_user values(null,?);"; Object[] args = new Object[]{tbyte2}; /* sql = "insert into t_user values(null,?,?);"; Object[] args = new Object[]{tbyte2,tbyte2}; 几个？在new object就要加入几个数据值 */ m_db.execSQL(sql,args); Log.v(TAG, "insert Table t_user ok"); return true; } catch (Exception e) { Log.v(TAG, "insert Table t_user err ,sql: " + sql); return false; } } 

 

下面在数据表中取得map数据，放入列表中。下面的代码中忘记对  fis.close();

public List> getmaptolist() { List> List = new ArrayList>(); Cursor cur = loadAll(); if(cur == null) return null; cur.moveToFirst(); while (!cur.isAfterLast()) { ByteArrayInputStream fis = new ByteArrayInputStream(cur.getBlob(1)); //ID(0) NAME(1) ObjectInputStream ois=null; try { ois = new ObjectInputStream(fis); } catch (StreamCorruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } if(ois == null) { cur.moveToNext(); continue; } HashMap ted =null; try { ted = (HashMap) ois.readObject(); } catch (OptionalDataException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { ois.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } List.add((Map) ted); cur.moveToNext(); } cur.close(); return List; } private static Cursor loadAll() { //表里就放了两个字段ID编号，NAME存放map ID(0) NAME(1) Cursor cur = m_db.query("t_user", new String[] { "_ID", "NAME" }, null, null, null, null, null); return cur; }

 

下面是我的表的创建

private void CreateTable() { try { m_db.execSQL("CREATE TABLE IF NOT EXISTS t_user (" + "_ID INTEGER PRIMARY KEY autoincrement," + "NAME BLOB" + ");"); Log.v(TAG, "Create Table t_user ok"); } catch (Exception e) { Log.v(TAG, "Create Table t_user err,table exists."); } }