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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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/**
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* 文件: NotesDatabaseHelper.java
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* 描述: 便签应用的数据库帮助类，负责创建和管理SQLite数据库
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* 作用: 提供数据库的创建、升级和表结构管理，是应用数据持久化的核心组件
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*/
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package net.micode.notes.data;
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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;
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/**
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* 便签数据库帮助类
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*
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* 继承自SQLiteOpenHelper，负责便签应用数据库的创建、升级和管理
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* 提供了便签表和数据表的创建与管理，以及各种数据库触发器的定义
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* 使用单例模式确保全局只有一个数据库连接实例
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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/** 数据库名称 */
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private static final String DB_NAME = "note.db";
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/** 数据库版本号 */
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private static final int DB_VERSION = 4;
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/**
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* 表名常量接口
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* 定义了数据库中的表名
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*/
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public interface TABLE {
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/** 便签表名 */
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public static final String NOTE = "note";
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/** 数据表名 */
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public static final String DATA = "data";
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}
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/** 日志标签 */
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private static final String TAG = "NotesDatabaseHelper";
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/** 单例实例 */
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private static NotesDatabaseHelper mInstance;
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/**
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* 创建便签表的SQL语句
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* 定义了便签表的结构，包括各列名和默认值
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*/
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private static final String CREATE_NOTE_TABLE_SQL =
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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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")";
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/**
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* 创建数据表的SQL语句
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* 定义了数据表的结构，用于存储便签的具体内容
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*/
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private static final String CREATE_DATA_TABLE_SQL =
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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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")";
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/**
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* 创建数据表NOTE_ID索引的SQL语句
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* 用于优化按便签ID查询数据的性能
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*/
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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 + ");";
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/**
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* 增加文件夹便签计数的触发器
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* 当便签移动到某个文件夹时，自动增加该文件夹的便签计数
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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";
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/**
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* 减少文件夹便签计数的触发器
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* 当便签从某个文件夹移出时，自动减少该文件夹的便签计数
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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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";
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/**
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* 增加文件夹便签计数的触发器
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* 当在某个文件夹中插入新便签时，自动增加该文件夹的便签计数
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
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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";
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/**
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* 减少文件夹便签计数的触发器
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* 当从某个文件夹中删除便签时，自动减少该文件夹的便签计数
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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 " +
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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";
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/**
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* 更新便签内容的触发器
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* 当插入类型为NOTE的数据时，自动更新对应便签的摘要内容
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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";
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/**
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* 更新便签内容的触发器
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* 当更新类型为NOTE的数据时，自动更新对应便签的摘要内容
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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";
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/**
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* 更新便签内容的触发器
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* 当删除类型为NOTE的数据时，自动清空对应便签的摘要内容
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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";
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/**
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* 删除便签相关数据的触发器
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* 当删除便签时，自动删除与该便签关联的所有数据
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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";
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/**
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* 删除文件夹内便签的触发器
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* 当删除文件夹时，自动删除该文件夹内的所有便签
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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";
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/**
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* 移动文件夹内便签到回收站的触发器
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* 当文件夹被移动到回收站时，自动将该文件夹内的所有便签也移动到回收站
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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";
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/**
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* 构造函数
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*
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* @param context 上下文环境
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*/
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION);
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}
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/**
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* 创建便签表
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*
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* @param db 数据库对象
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*/
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public void createNoteTable(SQLiteDatabase db) {
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// 执行创建便签表的SQL语句
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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// 重新创建便签表的触发器
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reCreateNoteTableTriggers(db);
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// 创建系统文件夹
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createSystemFolder(db);
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Log.d(TAG, "note table has been created");
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}
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/**
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* 重新创建便签表的触发器
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* 先删除已存在的触发器，然后重新创建
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*
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* @param db 数据库对象
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除已存在的触发器
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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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// 创建新的触发器
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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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}
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/**
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* 创建系统文件夹
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* 包括通话记录文件夹、根文件夹、临时文件夹和回收站文件夹
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*
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* @param db 数据库对象
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*/
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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/**
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* call record foler for call notes
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*/
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// 创建通话记录文件夹
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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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// 创建根文件夹（默认文件夹）
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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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// 创建临时文件夹（用于移动便签）
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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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// 创建回收站文件夹
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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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}
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/**
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* 创建数据表
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*
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* @param db 数据库对象
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*/
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public void createDataTable(SQLiteDatabase db) {
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// 执行创建数据表的SQL语句
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db.execSQL(CREATE_DATA_TABLE_SQL);
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// 重新创建数据表的触发器
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reCreateDataTableTriggers(db);
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// 创建数据表的索引
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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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/**
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* 重新创建数据表的触发器
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* 先删除已存在的触发器，然后重新创建
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*
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* @param db 数据库对象
|
|
|
*/
|
|
|
private void reCreateDataTableTriggers(SQLiteDatabase db) {
|
|
|
// 删除已存在的触发器
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
|
|
|
|
|
|
// 创建新的触发器
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 获取NotesDatabaseHelper的单例实例
|
|
|
*
|
|
|
* @param context 上下文环境
|
|
|
* @return NotesDatabaseHelper的单例实例
|
|
|
*/
|
|
|
static synchronized NotesDatabaseHelper getInstance(Context context) {
|
|
|
if (mInstance == null) {
|
|
|
mInstance = new NotesDatabaseHelper(context);
|
|
|
}
|
|
|
return mInstance;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 数据库创建回调方法
|
|
|
* 当数据库首次创建时调用
|
|
|
*
|
|
|
* @param db 数据库对象
|
|
|
*/
|
|
|
@Override
|
|
|
public void onCreate(SQLiteDatabase db) {
|
|
|
createNoteTable(db);
|
|
|
createDataTable(db);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 数据库升级回调方法
|
|
|
* 当数据库版本升级时调用
|
|
|
*
|
|
|
* @param db 数据库对象
|
|
|
* @param oldVersion 旧版本号
|
|
|
* @param newVersion 新版本号
|
|
|
*/
|
|
|
@Override
|
|
|
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
|
|
|
boolean reCreateTriggers = false;
|
|
|
boolean skipV2 = false;
|
|
|
|
|
|
// 从版本1升级到版本2
|
|
|
if (oldVersion == 1) {
|
|
|
upgradeToV2(db);
|
|
|
skipV2 = true; // 这个升级包含了从v2到v3的升级
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本2升级到版本3
|
|
|
if (oldVersion == 2 && !skipV2) {
|
|
|
upgradeToV3(db);
|
|
|
reCreateTriggers = true;
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本3升级到版本4
|
|
|
if (oldVersion == 3) {
|
|
|
upgradeToV4(db);
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 如果需要，重新创建触发器
|
|
|
if (reCreateTriggers) {
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
reCreateDataTableTriggers(db);
|
|
|
}
|
|
|
|
|
|
// 验证升级是否成功
|
|
|
if (oldVersion != newVersion) {
|
|
|
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
|
|
+ "fails");
|
|
|
}
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 升级到版本2
|
|
|
* 完全重建数据库表
|
|
|
*
|
|
|
* @param db 数据库对象
|
|
|
*/
|
|
|
private void upgradeToV2(SQLiteDatabase db) {
|
|
|
// 删除旧表
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
|
|
|
// 创建新表
|
|
|
createNoteTable(db);
|
|
|
createDataTable(db);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 升级到版本3
|
|
|
* 添加Google Tasks ID列和回收站文件夹
|
|
|
*
|
|
|
* @param db 数据库对象
|
|
|
*/
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
// 删除未使用的触发器
|
|
|
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");
|
|
|
// 添加Google Tasks ID列
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
|
// 添加回收站系统文件夹
|
|
|
ContentValues values = new ContentValues();
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 升级到版本4
|
|
|
* 添加版本列
|
|
|
*
|
|
|
* @param db 数据库对象
|
|
|
*/
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
// 添加版本列
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
}
|
|
|
}
|
