Android SQLite 示例

实体类：
public class MyEntry 
{
    public String title;
    public String location;
    public String description;
    public Calendar startCalendar;
    public Calendar endCalendar;
    public String entryID;
    
    public MyEntry(String entryID, String title, String location, String description, Calendar startCalendar, Calendar endCalendar)
    {
        this.entryID = entryID;
        this.title = title;
        this.location = location;
        this.description = description;
        this.startCalendar = Calendar.getInstance();
        this.endCalendar = Calendar.getInstance();
        
        this.startCalendar.setTimeInMillis(startCalendar.getTimeInMillis());
        this.endCalendar.setTimeInMillis(endCalendar.getTimeInMillis());
    }
}

SQLHelper类：
public class CalendarSQLHelper extends SQLiteOpenHelper 
{
    public static String tableName = "toAdd";
    public static String idRow = "id";
    public static String titleRow  = "title";
    public static String locationRow = "location";
    public static String descriptionRow = "description";
    public static String startTimeRow = "startTime";
    public static String endTimeRow = "endTime";
    
    public CalendarSQLHelper(Context context)
    {
        super(context, "smarhit_db", null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) 
    {
        
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
    {
        
    }
    
    public void createTable()
    {
        SQLiteDatabase db = getWritableDatabase();
        String sqlStr = "CREATE TABLE IF NOT EXISTS "
                + tableName
                + " ("/*+ID+" INTEGER PRIMARY KEY,"*/
                + idRow
                + " INTEGER PRIMARY KEY,"
                + titleRow
                + " VARCHAR,"
                + locationRow
                + " VARCHAR,"
                + descriptionRow
                + " VARCHAR,"
                + startTimeRow
                + " VARCHAR,"
                + endTimeRow
                + " VARCHAR)";
        db.execSQL(sqlStr);
        db.close();
    }
    
    public void insert(MyEntry entry)
    {
        SQLiteDatabase db = getWritableDatabase();
        
        ContentValues value = new ContentValues();
        
        value.put(titleRow, entry.title);
        value.put(locationRow, entry.location);
        value.put(descriptionRow, entry.description);
        value.put(startTimeRow, entry.startCalendar.getTimeInMillis());
        value.put(endTimeRow, entry.endCalendar.getTimeInMillis());
        
        db.insert(tableName, null, value);
        
        db.close();
    }
    
    public void update(String id, MyEntry entry)
    {
        SQLiteDatabase db = getWritableDatabase();
        
        ContentValues values = new ContentValues();
        values.put(titleRow, entry.title);
        values.put(locationRow, entry.location);
        values.put(descriptionRow, entry.description);
        values.put(startTimeRow, entry.startCalendar.getTimeInMillis() + "");
        values.put(endTimeRow, entry.endCalendar.getTimeInMillis() + "");
        
        db.update(tableName, values, idRow + "=?", new String[] {id});
        db.close();
    }
    
    public int getLastId()
    {
        SQLiteDatabase db = getReadableDatabase();
        
        Cursor c = db.query(tableName, 
                new String[] {},
                "",
                new String[] {},
                null, 
                null,
                "");
            
        if(c.getCount() == 0)
        {
            db.close();
            return 0;
        }
        else
        {
            c.moveToLast();
            int id = c.getInt(0);
            db.close();
            return id;
        }
    }
    
    public List<MyEntry> getAllRow()
    {
        SQLiteDatabase db = getReadableDatabase();
        
        List<MyEntry> entries = new ArrayList<MyEntry>();
        
        Cursor c = db.query(tableName, 
                new String[] {},
                "",
                new String[] {},
                null, 
                null,
                "");
        
        c.moveToFirst();
        
        for(int n=0; n<c.getCount(); n++)
        {
            long time = Long.parseLong(c.getString(4));
            Calendar startCalendar = Calendar.getInstance();
            Calendar endCalendar = Calendar.getInstance();
            
            startCalendar.setTimeInMillis(time);
            time = Long.parseLong(c.getString(5));
            endCalendar.setTimeInMillis(time);
            
            MyEntry entry = new MyEntry(c.getString(0), c.getString(1), c.getString(2), c.getString(3), startCalendar, endCalendar);
            entries.add(entry);
            c.moveToNext();
        }
        
        db.close();
        
        return entries;
    }
    
    public void deleteTable()
    {
        SQLiteDatabase db = getWritableDatabase();
        db.execSQL("DROP TABLE IF EXISTS " + tableName);
        db.close();
    }
}