diff --git a/doc/标注/210340061_林亭旭/SqlNote.java b/doc/标注/210340061_林亭旭/SqlNote.java
new file mode 100644
index 0000000..1a7ecc8
--- /dev/null
+++ b/doc/标注/210340061_林亭旭/SqlNote.java
@@ -0,0 +1,554 @@
+/*
+ * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.micode.notes.gtask.data;
+
+import android.appwidget.AppWidgetManager;
+import android.content.ContentResolver;
+import android.content.ContentValues;
+import android.content.Context;
+import android.database.Cursor;
+import android.net.Uri;
+import android.util.Log;
+
+import net.micode.notes.data.Notes;
+import net.micode.notes.data.Notes.DataColumns;
+import net.micode.notes.data.Notes.NoteColumns;
+import net.micode.notes.gtask.exception.ActionFailureException;
+import net.micode.notes.tool.GTaskStringUtils;
+import net.micode.notes.tool.ResourceParser;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+
+
+public class SqlNote {
+    private static final String TAG/*私有静态常量*/ = SqlNote.class.getSimpleName();
+
+    private static final int INVALID_ID = -99999;//无效的 ID
+
+    public static final String[] PROJECTION_NOTE = new String[]
+            //需要在查询中选择的笔记属性
+            {
+            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
+            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
+            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
+            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
+            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
+            NoteColumns.VERSION
+    };
+
+    public static final int ID_COLUMN = 0;//ID 属性在 PROJECTION_NOTE 数组中的下标为 0
+
+    public static final int ALERTED_DATE_COLUMN = 1;
+
+    public static final int BG_COLOR_ID_COLUMN = 2;
+
+    public static final int CREATED_DATE_COLUMN = 3;
+
+    public static final int HAS_ATTACHMENT_COLUMN = 4;
+
+    public static final int MODIFIED_DATE_COLUMN = 5;
+
+    public static final int NOTES_COUNT_COLUMN = 6;
+
+    public static final int PARENT_ID_COLUMN = 7;
+
+    public static final int SNIPPET_COLUMN = 8;
+
+    public static final int TYPE_COLUMN = 9;
+
+    public static final int WIDGET_ID_COLUMN = 10;
+
+    public static final int WIDGET_TYPE_COLUMN = 11;
+
+    public static final int SYNC_ID_COLUMN = 12;
+
+    public static final int LOCAL_MODIFIED_COLUMN = 13;
+
+    public static final int ORIGIN_PARENT_ID_COLUMN = 14;
+
+    public static final int GTASK_ID_COLUMN = 15;
+
+    public static final int VERSION_COLUMN = 16;
+
+    private Context mContext;//上下文
+
+    private ContentResolver mContentResolver;//ContentResolver 对象
+
+    private boolean mIsCreate;//表示是否在数据库中创建新笔记
+
+    private long mId;//笔记的 ID
+
+    private long mAlertDate;//提醒日期
+
+    private int mBgColorId;//背景颜色 ID
+
+    private long mCreatedDate;//创建日期
+
+    private int mHasAttachment;//是否有附件
+
+    private long mModifiedDate;//修改日期
+
+    private long mParentId;//父笔记 ID
+
+    private String mSnippet;//笔记的摘要
+
+    private int mType;//笔记类型
+
+    private int mWidgetId;//小部件 ID
+
+    private int mWidgetType;//小部件类型
+
+    private long mOriginParent;//原始父笔记 ID
+
+    private long mVersion;//版本号
+
+    private ContentValues mDiffNoteValues;// ContentValues 类型的 mDiffNoteValues
+
+    private ArrayList<SqlData> mDataList;//SqlData 对象的列表
+
+    public SqlNote(Context context) {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        //将传入的上下文对象赋值给成员变量 mContext 和 mContentResolver
+        mIsCreate = true;
+        //将 mIsCreate 置为 true，表示该笔记是要被创建的
+        mId = INVALID_ID;
+        //mId 赋值为常量 INVALID_ID，表示该笔记的 ID 是无效的
+        mAlertDate = 0;
+        mBgColorId = ResourceParser.getDefaultBgId(context);//
+        // 将 mBgColorId 设为默认背景颜色 ID；
+        mCreatedDate = System.currentTimeMillis();
+        // 将 mCreatedDate 和 mModifiedDate 设为当前时间戳。
+        mHasAttachment = 0;
+        //mHasAttachment 设为 0，表示该笔记没有附件
+        mModifiedDate = System.currentTimeMillis();
+        mParentId = 0;
+        //mParentId 设为 0，表示该笔记的父 ID 是无效的
+        mSnippet = "";//mSnippet 设为空字符串，表示该笔记没有摘要
+        mType = Notes.TYPE_NOTE;
+        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;//该笔记没有小部件 ID
+        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;//该笔记不是小部件
+        mOriginParent = 0;//该笔记没有原始父笔记
+        mVersion = 0;//笔记的版本号是 0
+        mDiffNoteValues = new ContentValues();
+        //建一个空的 ContentValues 对象赋值给 mDiffNoteValues
+        mDataList = new ArrayList<SqlData>();
+        //创建一个空的 SqlData 对象列表 mDataList
+    }
+
+    public SqlNote(Context context, Cursor c)
+    //将传入的 Cursor 对象中的数据加载到 SqlNote 对象中
+    {
+        mContext = context;
+        mContentResolver = context.getContentResolver();
+        //分别赋值为传入的上下文
+        mIsCreate = false;//这是一个已经存在的笔记
+        loadFromCursor(c);//从 Cursor 对象中读取数据并加载到 SqlNote 对象中
+        mDataList = new ArrayList<SqlData>();//创建一个空的 SqlData 对象列表 mDataList
+        if (mType == Notes.TYPE_NOTE)
+            //如果该笔记是普通笔记，则调用 loadDataContent() 方法从数据库读取笔记内容和附件信息
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+        //创建一个空的 ContentValues 对象赋值给 mDiffNoteValues
+    }
+
+    public SqlNote(Context context, long id)
+    //根据笔记 ID 加载笔记数据
+    {
+        mContext = context;
+        mContentResolver = context.getContentResolver();//初始化
+        mIsCreate = false;//已经存在的笔记
+        loadFromCursor(id);
+        mDataList = new ArrayList<SqlData>();
+        if (mType == Notes.TYPE_NOTE)
+            loadDataContent();
+        mDiffNoteValues = new ContentValues();
+//创建一个空的 ContentValues 对象赋值给 mDiffNoteValues
+    }
+
+    private void loadFromCursor(long id)
+    //根据给定的笔记 ID 从数据库中加载笔记信息
+    {
+        Cursor c = null;
+        try {
+            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
+                   //查询指定 ID 的笔记数据
+                    new String[] {
+                        String.valueOf(id)
+                    }, null);//对获取数据进行判空
+            if (c != null) {
+                c.moveToNext();
+                loadFromCursor(c);
+                // 不为空，将游标移动到第一行，
+                // 并调用 loadFromCursor(Cursor c) 方法将数据加载到 SqlNote 对象中
+            } else {
+                Log.w(TAG, "loadFromCursor: cursor = null");//为空，则打印一条警告日志
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    private void loadFromCursor(Cursor c)
+    //从 Cursor 对象中加载笔记数据
+    {
+        mId = c.getLong(ID_COLUMN);//笔记的 ID
+        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);//提醒时间
+        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);//背景颜色 ID
+        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);//创建时间
+        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);//是否有附件
+        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);//修改时间
+        mParentId = c.getLong(PARENT_ID_COLUMN);//父亲笔记的 ID
+        mSnippet = c.getString(SNIPPET_COLUMN);//笔记片段
+        mType = c.getInt(TYPE_COLUMN);//笔记类型
+        mWidgetId = c.getInt(WIDGET_ID_COLUMN);//挂件 ID
+        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);//挂件类型
+        mVersion = c.getLong(VERSION_COLUMN);//版本号
+    }
+
+    private void loadDataContent()
+    //从数据库中读取笔记的内容和附件信息，并将其存储在 mDataList
+    {
+        Cursor c = null;
+        mDataList.clear();
+        //清空 mDataList 列表
+        try {
+            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
+                    "(note_id=?)", new String[] {
+                        String.valueOf(mId)
+                    }, null);//判断获取到的 Cursor 对象是否为空
+            if (c != null) {// 不为空，则判断游标中是否有数据
+                if (c.getCount() == 0) {
+                    Log.w(TAG, "it seems that the note has not data");
+                    //无数据，则打印一条警告日志并返回
+                    return;
+                }
+                while (c.moveToNext()) {
+                    SqlData data = new SqlData(mContext, c);
+                    mDataList.add(data);
+                }//遍历游标中的每一行数据，创建 SqlData 对象并添加到 mDataList 列表
+            } else {
+                Log.w(TAG, "loadDataContent: cursor = null");
+            }
+        } finally {
+            if (c != null)
+                c.close();
+        }
+    }
+
+    public boolean setContent(JSONObject js)
+    //据传入的 JSONObject 对象设置笔记的内容
+    {
+        try {
+            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
+            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
+                Log.w(TAG, "cannot set system folder");
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
+                // for folder we can only update the snnipet and type
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+            } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
+                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
+                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
+                if (mIsCreate || mId != id) {
+                    mDiffNoteValues.put(NoteColumns.ID, id);
+                }
+                mId = id;
+
+                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note
+                        .getLong(NoteColumns.ALERTED_DATE) : 0;
+                if (mIsCreate || mAlertDate != alertDate) {
+                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
+                }
+                mAlertDate = alertDate;
+
+                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note
+                        .getInt(NoteColumns.BG_COLOR_ID) : ResourceParser.getDefaultBgId(mContext);
+                if (mIsCreate || mBgColorId != bgColorId) {
+                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
+                }
+                mBgColorId = bgColorId;
+//系统文件夹或者文件夹类型的笔记，只能更新摘要和类型，而对于笔记类型的笔记，会解析出一系列字段，并将它们保存在一个 List 中
+                long createDate = note.has(NoteColumns.CREATED_DATE) ? note
+                        .getLong(NoteColumns.CREATED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mCreatedDate != createDate) {
+                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
+                }
+                mCreatedDate = createDate;
+
+                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note
+                        .getInt(NoteColumns.HAS_ATTACHMENT) : 0;
+                if (mIsCreate || mHasAttachment != hasAttachment) {
+                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
+                }
+                mHasAttachment = hasAttachment;
+
+                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note
+                        .getLong(NoteColumns.MODIFIED_DATE) : System.currentTimeMillis();
+                if (mIsCreate || mModifiedDate != modifiedDate) {
+                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
+                }
+                mModifiedDate = modifiedDate;
+
+                long parentId = note.has(NoteColumns.PARENT_ID) ? note
+                        .getLong(NoteColumns.PARENT_ID) : 0;
+                if (mIsCreate || mParentId != parentId) {
+                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
+                }
+                mParentId = parentId;
+
+                String snippet = note.has(NoteColumns.SNIPPET) ? note
+                        .getString(NoteColumns.SNIPPET) : "";
+                if (mIsCreate || !mSnippet.equals(snippet)) {
+                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
+                }
+                mSnippet = snippet;
+
+                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
+                        : Notes.TYPE_NOTE;
+                if (mIsCreate || mType != type) {
+                    mDiffNoteValues.put(NoteColumns.TYPE, type);
+                }
+                mType = type;
+
+                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
+                        : AppWidgetManager.INVALID_APPWIDGET_ID;
+                if (mIsCreate || mWidgetId != widgetId) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
+                }
+                mWidgetId = widgetId;
+
+                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note
+                        .getInt(NoteColumns.WIDGET_TYPE) : Notes.TYPE_WIDGET_INVALIDE;
+                if (mIsCreate || mWidgetType != widgetType) {
+                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
+                }
+                mWidgetType = widgetType;
+
+                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note
+                        .getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
+                if (mIsCreate || mOriginParent != originParent) {
+                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
+                }
+                mOriginParent = originParent;
+//分别解析
+                for (int i = 0; i < dataArray.length(); i++)
+
+                {
+                    JSONObject data = dataArray.getJSONObject(i);
+                    SqlData sqlData = null;//未找到设置为null
+                    if (data.has(DataColumns.ID)) //根据数据块 ID 在 mDataList 中查找对应的 SqlData 对象
+                         {
+                        long dataId = data.getLong(DataColumns.ID);//赋值
+                        for (SqlData temp : mDataList) {
+                            if (dataId == temp.getId()) {
+                                sqlData = temp;
+                            }
+                        }
+                    }
+
+                    if (sqlData == null) {
+                        sqlData = new SqlData(mContext);
+                        mDataList.add(sqlData);//没找到对像，则新建一个对象并添加到 mDataList 中
+                    }
+
+                    sqlData.setContent(data);
+                }
+            }
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+            return false;
+        }//当 JSON 解析出错时，将会抛出 JSONException 异常并被 catch 住
+        return true;
+    }
+
+    public JSONObject getContent()
+    //将 SqlData 对象转换为 JSONObject
+     {
+        try {
+            JSONObject js = new JSONObject();
+            //判断 SqlData 对象是否已经存入数据库中
+
+            if (mIsCreate) {
+                Log.e(TAG, "it seems that we haven't created this in database yet");
+                return null;
+                //未存储，返回 null
+            }
+
+            JSONObject note = new JSONObject();
+            if (mType == Notes.TYPE_NOTE) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.ALERTED_DATE, mAlertDate);
+                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
+                note.put(NoteColumns.CREATED_DATE, mCreatedDate);
+                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
+                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
+                note.put(NoteColumns.PARENT_ID, mParentId);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.WIDGET_ID, mWidgetId);
+                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
+                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+
+                JSONArray dataArray = new JSONArray();
+                for (SqlData sqlData : mDataList) {
+                    JSONObject data = sqlData.getContent();
+                    if (data != null) {
+                        dataArray.put(data);
+                    }
+                }//根据 SqlData 对象的类型不同，分别构造 Note 和 Data 两个 JSONObject，
+                // 并放入 META_HEAD_NOTE 和 META_HEAD_DATA 字段中
+                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
+            } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
+                note.put(NoteColumns.ID, mId);
+                note.put(NoteColumns.TYPE, mType);
+                note.put(NoteColumns.SNIPPET, mSnippet);
+                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
+            }
+
+            return js;//将其内容转换为 JSONObject 对象并返回
+        } catch (JSONException e) {
+            Log.e(TAG, e.toString());
+            e.printStackTrace();
+        }
+        return null;//遇到错误会打印日志并返回 null
+    }
+
+    public void setParentId(long id)
+    //设置 SqlData 对象的父节点 ID
+    {
+        mParentId = id;
+        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
+    }
+
+    public void setGtaskId(String gid) {
+        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
+    }
+
+    public void setSyncId(long syncId) {
+        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
+    }
+
+    public void resetLocalModified() {
+        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public long getParentId() {
+        return mParentId;
+    }
+
+    public String getSnippet() {
+        return mSnippet;
+    }
+
+    public boolean isNoteType() {
+        return mType == Notes.TYPE_NOTE;
+    }
+
+    public void commit(boolean validateVersion)
+    //将 SqlData 对象中的属性变化保存到数据库中
+    {
+        if (mIsCreate)
+        //判断该对象是新创建的还是已经存在于数据库中
+        {
+            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
+                mDiffNoteValues.remove(NoteColumns.ID);
+            }
+
+            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
+            //新建的对象，则调用 insert 方法将其保存到数据库中
+            try {
+                mId = Long.valueOf(uri.getPathSegments().get(1));
+            } catch (NumberFormatException e) {
+                Log.e(TAG, "Get note id error :" + e.toString());
+                throw new ActionFailureException("create note failed");
+            }
+            if (mId == 0) {
+                throw new IllegalStateException("Create thread id failed");
+            }//对是否为新值进行判定
+
+            if (mType == Notes.TYPE_NOTE) {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, false, -1);
+                    //validateVersion 参数指定为 false，mVersion 参数指定为 -1
+                }
+            }
+        } else {
+            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
+                Log.e(TAG, "No such note");
+                throw new IllegalStateException("Try to update note with invalid id");
+            }
+            //判断当前对象的 ID 是否合法，如果不合法则抛出异常
+            if (mDiffNoteValues.size() > 0) {
+                mVersion ++;
+                int result = 0;
+                if (!validateVersion) {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?)", new String[] {
+                        String.valueOf(mId)
+                    });
+                } else {
+                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues, "("
+                            + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
+                            new String[] {
+                                    String.valueOf(mId), String.valueOf(mVersion)
+                            });
+                }
+                if (result == 0) {
+                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
+                }
+            }//判断笔记是否被成功更新，并在更新失败时输出一些日志信息。
+
+            if (mType == Notes.TYPE_NOTE)//检查当前对象是否表示笔记对象
+                 {
+                for (SqlData sqlData : mDataList) {
+                    sqlData.commit(mId, validateVersion, mVersion);//对比参数，不对校验版本号
+                }
+            }
+        }
+
+        // refresh local info
+        loadFromCursor(mId);//逐一转换为 SqlData 对象，并添加到 mDataList 变量中
+        if (mType == Notes.TYPE_NOTE)//加载笔记内容
+            loadDataContent();
+
+        mDiffNoteValues.clear();//清空 mDiffNoteValues 变量
+        mIsCreate = false;//标记设置为 false，表示当前对象已经存在于数据库中
+    }
+}