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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.micode.notes.data;//声明包
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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import net.micode.notes.data.Notes.DataColumns;
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import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;//数据库操作中保存数据信息
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public class NotesDatabaseHelper extends SQLiteOpenHelper {//继承于SQLiteOpenHelper的类NotesDatabaseHelper，用于实现对便签或者 文件的数据库操作，例如删除便签
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private static final String DB_NAME = "note.db";//定义数据库的名称为“note.db”
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private static final int DB_VERSION = 4;//数据库版本号
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public interface TABLE {//将接口分成note和data
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public static final String NOTE = "note";//创建便签表的数据库
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public static final String DATA = "data";//数据库中需要存储的项目的名称，就类似创建一个表格的表头的内容。
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}
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private static final String TAG = "NotesDatabaseHelper";//存储便签编号的一个数据表格
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private static NotesDatabaseHelper mInstance;//创建类NotesDatabaseHelper的对象——mInstance
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private static final String CREATE_NOTE_TABLE_SQL =//文件夹增加Note后需要更改的数据的表格
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"CREATE TABLE " + TABLE.NOTE + "(" +//文件夹减少Note后需要更改的数据的表格
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NoteColumns.ID + " INTEGER PRIMARY KEY," +//文件夹插入Note后需要更改的数据的表格
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +//文件夹删除Note后需要更改的数据的表格
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +//应用界面颜色选择
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +// 创建时间数据
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +//文件夹中便签数据初始化为0
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +//Note中数据删除更改的数据表格。
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +//数据库中需要存储的项目的名称，就相当于创建一个表格的表头的内容
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")";
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private static final String CREATE_DATA_TABLE_SQL =//创建SQL的data表
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"CREATE TABLE " + TABLE.DATA + "(" +//note删除数据触发
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DataColumns.ID + " INTEGER PRIMARY KEY," +
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DataColumns.MIME_TYPE + " TEXT NOT NULL," +
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA1 + " INTEGER," +
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DataColumns.DATA2 + " INTEGER," +
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";//文件夹删除note触发
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =//文件夹移除note时触发垃圾回收
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"CREATE INDEX IF NOT EXISTS note_id_index ON " +
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TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";//存储便签编号的一个数据表格
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//以下几个都是在创建触发器(trigger)。触发器是一些在特定的数据库事件(database-event) 发生时自动进行的数据库操作
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/**
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* Increase folder's note count when move note to the folder
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*///Increase增加文件Decrease减少文件
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =//将新的note移入该文件夹时，更新该文件夹note的数量
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"CREATE TRIGGER increase_folder_count_on_update "+
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";// 在文件夹中移入一个Note之后需要更改的数据的表格
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/**
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* Decrease folder's note count when move note from folder
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =//notes从文件夹移除后，数量减一，并且进行一系列的操作
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"CREATE TRIGGER decrease_folder_count_on_update " +
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +//在文件夹中移出一个Note之后需要更改的数据的表格
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" END";
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//便签从文件夹移除后，数量减一，并且进行一系列的操作进行更新
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/**
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* Increase folder's note count when insert new note to the folder
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =//在文件夹中新建notes后，数量加1
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"CREATE TRIGGER increase_folder_count_on_insert " +
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" AFTER INSERT ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";//在文件夹中插入一个Note之后需要更改的数据的表格
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/**
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* Decrease folder's note count when delete note from the folder
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_delete " +//定义一个更新文件夹中便签数目的SQL语句。当有便签从该文件夹中删除时使用
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN " +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
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" AND " + NoteColumns.NOTES_COUNT + ">0;" +
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" END";//在文件夹中删除一个Note之后需要更改的数据的表格
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/**
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* Update note's content when insert data with type {@link DataConstants#NOTE}
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*///构建一条SQL语句，用于实现在note中输入data后，进行当前状态的更新
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER update_note_content_on_insert " +
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" AFTER INSERT ON " + TABLE.DATA +
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" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";//在文件夹中对一个Note导入新的数据之后需要更改的数据的表格
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/**
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* Update note's content when data with {@link DataConstants#NOTE} type has changed
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*///在data数据改变后对整个应用进行数据刷新
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_update " +
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" AFTER UPDATE ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";//Note数据被修改后需要更改的数据的表格
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/**
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* Update note's content when data with {@link DataConstants#NOTE} type has deleted
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*///在数据被删除时，进行更新。
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_delete " +
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" AFTER delete ON " + TABLE.DATA +
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=''" +
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
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" END";//Note数据被删除后需要更改的数据的表格
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/**
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* Delete datas belong to note which has been deleted
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*///实现在note被删除后，将该note对应的data删除的功能
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private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
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"CREATE TRIGGER delete_data_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.DATA +
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" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
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" END";//删除已删除的便签的数据后需要更改的数据的表格
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/**
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* Delete notes belong to folder which has been deleted
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*///用于实现在文件夹被删除后，将该文件夹中的note删除的功能
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private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
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"CREATE TRIGGER folder_delete_notes_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN" +
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" DELETE FROM " + TABLE.NOTE +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";//删除已删除的文件夹的便签后需要更改的数据的表格
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/**
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* Move notes belong to folder which has been moved to trash folder
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*///恢复删除的notes,并且更新一些数据
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =//将垃圾文件夹里的note还原，并更新数据表格
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"CREATE TRIGGER folder_move_notes_on_trash " +
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" AFTER UPDATE ON " + TABLE.NOTE +
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" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";//还原垃圾桶中便签后需要更改的数据的表格
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION);
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}//构造函数，传入数据库的名称和版本
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public void createNoteTable(SQLiteDatabase db) {//标注出数据库的名称和版本
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db.execSQL(CREATE_NOTE_TABLE_SQL);//创建表头
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reCreateNoteTableTriggers(db);
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createSystemFolder(db);
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Log.d(TAG, "note table has been created");
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}//创建表格，存储标签属性
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {//创建一个储存标签属性的表格
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");//创建增加文件夹的触发器
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");//创建减少文件夹的触发器
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
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//在删除原来的触发器后，创建新的触发器
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);//创建自己的数据库操作
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);//创建更新减少文件夹的触发器
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
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db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);//创建删除notes的触发器
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);//创建将回收站中的notes还原的触发器
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}//execSQL通过添加sql语句可以执行sql操作
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//execSQL通过添加sql语句可以执行sql操作
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private void createSystemFolder(SQLiteDatabase db) {//创建几个系统文件夹
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ContentValues values = new ContentValues();//向数据库中插入数据，就要新建一个contentValues的对象。但只能存储基本类型数据
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/**
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* call record foler for call notes
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*///储存呼叫记录的文件夹
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);//放入数据(NoteColumns的id,呼叫记录文件夹的ld）
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);//插入ContantValues对象
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/**
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* root folder which is default folder
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*///对默认文件夹（根文件夹）进行操作
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values.clear();//对根文件夹（默认文件夹）进行修改，首先先把values容器清空，在对他添加内容，最后放入数据库
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values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);//将数据库ID与通话记录文件夹ID形成映射
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);//将数据库中数据类型与通话记录文件夹类型形成映射
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db.insert(TABLE.NOTE, null, values);
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/**
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* temporary folder which is used for moving note
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*///移动note的临时文件夹
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values.clear();// 临时文件夹的修改操作
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values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);//将数据库ID与通话记录文件夹ID形成映射
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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/**
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* create trash folder
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*///创建垃圾文件夹
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);//将数据库ID与通话记录文件夹ID形成映射
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);
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}
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public void createDataTable(SQLiteDatabase db) {//将数据库ID与通话记录文件夹ID形成映射
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db.execSQL(CREATE_DATA_TABLE_SQL);//用来重新创建note对应的data的表项
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reCreateDataTableTriggers(db);//重新建立数据表的触发器
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db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
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Log.d(TAG, "data table has been created");
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}
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private void reCreateDataTableTriggers(SQLiteDatabase db) {//删除重建表格
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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}
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static synchronized NotesDatabaseHelper getInstance(Context context) {//如果NotesDatabaseHelper的实例创建失败，那就重新建一个，重新分配内从空间
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if (mInstance == null) {
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mInstance = new NotesDatabaseHelper(context);
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}
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return mInstance;
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}
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@Override
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public void onCreate(SQLiteDatabase db) {//在NotesDatabaseHelper对象生命周期开始时创建Note table和Datatable
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createNoteTable(db);//函数：生命周期开始的时候oncreate 被调用，这里对其进行重写，加入notes表单和数据表单
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createDataTable(db);
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}//实现两个表格
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {//数据库版本的更新
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boolean reCreateTriggers = false;//是否重新建立note及data的表项
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boolean skipV2 = false;
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if (oldVersion == 1) {//代码段：如果版本是一则更新到版本二
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upgradeToV2(db);
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skipV2 = true; // this upgrade including the upgrade from v2 to v3
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oldVersion++;
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}
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if (oldVersion == 2 && !skipV2) {//判断旧版本是不是2号版本且没有跳过2号版本，就更新到3号版本
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upgradeToV3(db);
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reCreateTriggers = true;
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oldVersion++;
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}
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if (oldVersion == 3) {//v3-v4
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upgradeToV4(db);
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oldVersion++;
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}
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if (reCreateTriggers) {//重新创建的同时，创建新的note table和datatable
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reCreateNoteTableTriggers(db);
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reCreateDataTableTriggers(db);
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}
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if (oldVersion != newVersion) {//旧版本与最新版本不一致，抛出异常
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throw new IllegalStateException("Upgrade notes database to version " + newVersion
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+ "fails");
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}
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}
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private void upgradeToV2(SQLiteDatabase db) {//将数据库的版本更新到V2
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
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createNoteTable(db);
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createDataTable(db);
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}
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private void upgradeToV3(SQLiteDatabase db) {//gengxinv3
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// drop unused triggers
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
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// add a column for gtask id
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
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+ " TEXT NOT NULL DEFAULT ''");
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// add a trash system folder在数据库的便签（note）表单中加上一个默认的垃圾文件夹，不用用户自己创建
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ContentValues values = new ContentValues();//添加垃圾系统文件夹
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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db.insert(TABLE.NOTE, null, values);//插入到表中
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}
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private void upgradeToV4(SQLiteDatabase db) {//数据库版本升级到V4
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
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+ " INTEGER NOT NULL DEFAULT 0");
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}
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}
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