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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;
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import android.content.ContentValues;//用于保存一些数据（string boolean byte double float int long short ...）信息，这些信息可以被数据库操作时使用
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import android.content.Context;//加载和访问资源
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import android.database.sqlite.SQLiteDatabase;//主要提供了对应于添加、删除、更新、查询的操作方法：insert()、delete()、update()、query()。配合content.values
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import android.database.sqlite.SQLiteOpenHelper;//用来管理数据的创建和版本更新
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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;
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//数据库操作，用SQLOpenhelper，对一些note和文件进行数据库的操作，比如删除文件后，将文件里的note也相应删除
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//定义了一个 NotesDatabaseHelper类，这是一个辅助类，它继承自SQLiteOpenHelper类，提供了创建和管理SQLite数据库的方法。
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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private static final String DB_NAME = "note.db";//数据库的名字
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private static final int DB_VERSION = 4;//数据库的版本号
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public interface TABLE {//接口，分成note和data，在后面的程序里分别使用过
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public static final String NOTE = "note";
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public static final String DATA = "data";
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}
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private static final String TAG = "NotesDatabaseHelper";
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private static NotesDatabaseHelper mInstance;
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private static final String CREATE_NOTE_TABLE_SQL =//SQL语句，用于创建存储笔记信息的表格
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"CREATE TABLE " + TABLE.NOTE + "(" +
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NoteColumns.ID + " INTEGER PRIMARY KEY," +
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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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," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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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," +
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
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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" +
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")";//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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private static final String CREATE_DATA_TABLE_SQL =//SQL语句，用于创建存储笔记内容的表格
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"CREATE TABLE " + TABLE.DATA + "(" +
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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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")";//和上面的功能一样，主要是存储的项目不同
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private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
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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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/**
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* Increase folder's note count when move note to the folder
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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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 =//创建一个update功能的触发器，
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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" + ";" +
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" END";//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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/**
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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 =//创建一个insert功能的触发器，向文件夹中插入笔记时自动增加该文件夹的笔记数量
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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 =//创建一个删除功能的触发器
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"CREATE TRIGGER decrease_folder_count_on_delete " +
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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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*/
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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Note导入一个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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*/
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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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*/
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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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*/
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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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*/
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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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*/
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
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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";//还原垃圾桶中的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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}//构造数据库，传入数据库的名称和版本
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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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（用来存储标签属性）
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
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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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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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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);
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}//execSQL是数据库操作的API，主要是更改行为的SQL语句
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//在这里主要是用来重新创建上述定义的表格用的，先删除原来有的数据库的触发器，再重新创建新的数据库
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private void createSystemFolder(SQLiteDatabase db) {//创建系统文件夹，四个类型为system类型的文件夹
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ContentValues values = new ContentValues();
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//每个文件夹有唯一的ID,可以通过ID在数据库中查找，系统文件夹用来管理笔记的分类、移动和删除等操作
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/**
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* call record foler for call notes
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*/
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//通话记录文件夹
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
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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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* root folder which is default folder
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*/
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//根文件夹
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
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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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* temporary folder which is used for moving note
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*/
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//临时文件夹
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
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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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*/
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//回收站文件夹
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values.clear();
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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);
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}//创建几个系统文件夹
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public void createDataTable(SQLiteDatabase db) {//用于创建数据库中的表格，在onCreate()方法中调用
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db.execSQL(CREATE_DATA_TABLE_SQL);
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reCreateDataTableTriggers(db);
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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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}//创建表格，用来存储标签内容
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private void reCreateDataTableTriggers(SQLiteDatabase db) {//用于创建数据库的触发器，在onCreate()方法中调用
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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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}//同上面的execSQL
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//使用 synchronized 关键字来确保在多线程环境下只创建一个 NotesDatabaseHelper 实例。这样可以避免并发访问数据库时出现问题。
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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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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}//上网查是为解决同一时刻只能有一个线程执行
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//在写程序库代码时，有时有一个类需要被所有的其它类使用
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//但又要求这个类只能被实例化一次，是个服务类，定义一次，其它类使用同一个这个类的实例
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@Override
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public void onCreate(SQLiteDatabase db) {//数据库在首次创建时会调用
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createNoteTable(db);
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createDataTable(db);
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}//实现两个表格，上面创建的两个表格
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {//数据库版本升级时调用
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boolean reCreateTriggers = false;
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boolean skipV2 = false;
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if (oldVersion == 1) {
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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) {
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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) {
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upgradeToV4(db);
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oldVersion++;
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}
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if (reCreateTriggers) {
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reCreateNoteTableTriggers(db);
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reCreateDataTableTriggers(db);
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}
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|
|
|
|
|
if (oldVersion != newVersion) {
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|
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
|
|
+ "fails");
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|
}
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|
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}//数据库版本的更新（数据库内容的更改）
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|
|
|
|
|
//使用 SQLiteDatabase 类提供的 execSQL() 方法执行创建系统文件夹、表格和触发器的 SQL 语句。
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|
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private void upgradeToV2(SQLiteDatabase db) {
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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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|
|
}//更新到v2版本
|
|
|
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
// drop unused triggers
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|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
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|
|
// add a column for gtask id
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
|
// add a trash system folder
|
|
|
ContentValues values = new ContentValues();
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|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
}//更新到v3版本
|
|
|
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
}//更新到v4版本
|
|
|
}
|
