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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;
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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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* 笔记应用的SQLite数据库帮助类，继承自Android的SQLiteOpenHelper
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* 核心功能：
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* 1. 采用单例模式管理数据库实例，避免多实例导致的数据库锁问题；
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* 2. 创建笔记应用的核心数据表（note表、data表）及索引；
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* 3. 定义数据库触发器，实现数据联动逻辑（如文件夹笔记数量自动更新、笔记内容同步等）；
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* 4. 初始化系统预设文件夹（根目录、通话记录、临时、回收站）；
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* 5. 处理数据库版本升级，保证数据迁移的兼容性。
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*
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* @author MiCode Open Source Community
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* @date 2010-2011
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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/**
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* 数据库文件名，存储在应用的私有数据目录下
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*/
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private static final String DB_NAME = "note.db";
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/**
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* 数据库版本号，用于版本升级控制（当前为6，增加了标签功能）
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*/
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private static final int DB_VERSION = 6;
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/**
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* 数据表名称接口，定义note表、data表、标签表和便签-标签关联表的名称常量
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*/
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public interface TABLE {
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// 笔记/文件夹表名称
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public static final String NOTE = "note";
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// 笔记明细数据表名称（存储文本、通话记录等具体内容）
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public static final String DATA = "data";
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}
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/**
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* 日志标签，用于Logcat输出时标识当前类，方便调试定位问题
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*/
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private static final String TAG = "NotesDatabaseHelper";
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/**
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* 单例实例，全局唯一的NotesDatabaseHelper对象
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* 采用静态变量存储，避免多次创建数据库帮助类实例
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*/
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private static NotesDatabaseHelper mInstance;
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// ====================== 数据表创建SQL语句 ======================
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/**
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* 创建note表的SQL语句
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* note表存储笔记和文件夹的基础信息（如ID、父级ID、创建时间、类型等）
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* 所有列均设置默认值，保证数据完整性；主键为ID（自增整型）
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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," + // 主键ID
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父级ID（关联文件夹）
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒时间
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID
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// 创建时间：默认值为当前时间戳（秒转毫秒）
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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," + // 是否有附件
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// 修改时间：默认值为当前时间戳
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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," + // 文件夹下的笔记数量
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 文件夹名称/笔记摘要
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 类型（笔记/文件夹/系统）
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NoteColumns.PINNED + " INTEGER NOT NULL DEFAULT 0," + // 是否置顶（0：不置顶，1：置顶）
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的Widget ID
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 关联的Widget类型
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID（GTask）
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 本地修改标记
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父级ID
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // GTask ID
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号
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")";
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/**
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* 创建data表的SQL语句
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* data表存储笔记的具体内容（文本、通话记录等），与note表通过NOTE_ID关联
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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," + // 主键ID
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DataColumns.MIME_TYPE + " TEXT NOT NULL," + // 数据类型（文本/通话记录）
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的note表ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建时间
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改时间
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 数据内容
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DataColumns.DATA1 + " INTEGER," + // 通用整型列1
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DataColumns.DATA2 + " INTEGER," + // 通用整型列2
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 通用文本列3
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 通用文本列4
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 通用文本列5
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")";
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/**
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* 创建data表的NOTE_ID索引的SQL语句
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* 索引用于提升根据NOTE_ID查询data表的性能（频繁关联查询场景）
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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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// ====================== 数据库触发器SQL语句（note表） ======================
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/**
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* 触发器：更新笔记的父级ID时，增加新文件夹的笔记数量
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* 触发时机：note表的PARENT_ID列更新后
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* 逻辑：将新父级文件夹的NOTES_COUNT加1
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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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* 触发器：更新笔记的父级ID时，减少旧文件夹的笔记数量
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* 触发时机：note表的PARENT_ID列更新后
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* 逻辑：将旧父级文件夹的NOTES_COUNT减1（需保证数量大于0）
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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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* 触发器：插入新笔记时，增加对应文件夹的笔记数量
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* 触发时机：note表插入数据后
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* 逻辑：将新笔记的父级文件夹的NOTES_COUNT加1
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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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* 触发器：删除笔记时，减少对应文件夹的笔记数量
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* 触发时机：note表删除数据后
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* 逻辑：将被删除笔记的父级文件夹的NOTES_COUNT减1（需保证数量大于0）
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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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// ====================== 数据库触发器SQL语句（data表） ======================
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/**
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* 触发器：插入文本笔记数据时，同步更新note表的摘要内容
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* 触发时机：data表插入数据后（且数据类型为文本笔记）
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* 逻辑：将note表的SNIPPET列设为data表的CONTENT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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* 触发器：更新文本笔记数据时，同步更新note表的摘要内容
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* 触发时机：data表更新数据后（且数据类型为文本笔记）
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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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* 触发器：删除文本笔记数据时，清空note表的摘要内容
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* 触发时机：data表删除数据后（且数据类型为文本笔记）
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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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* 触发器：删除笔记时，级联删除对应的data表数据
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* 触发时机：note表删除数据后
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* 逻辑：删除data表中NOTE_ID等于被删除笔记ID的所有数据，避免数据冗余
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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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* 触发器：删除文件夹时，级联删除该文件夹下的所有笔记
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* 触发时机：note表删除数据后（删除的是文件夹）
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* 逻辑：删除note表中PARENT_ID等于被删除文件夹ID的所有笔记
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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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* 构造方法，调用父类SQLiteOpenHelper的构造方法初始化数据库
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*
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* @param context 上下文对象，用于访问应用的资源和私有目录
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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note表，并初始化相关触发器和系统文件夹
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*
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* @param db SQLiteDatabase对象，用于执行SQL语句
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*/
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public void createNoteTable(SQLiteDatabase db) {
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// 执行创建note表的SQL
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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// 重新创建note表的触发器
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reCreateNoteTableTriggers(db);
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// 初始化系统文件夹
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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note表的所有触发器（先删除旧触发器，再创建新触发器）
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* 用于数据库升级或触发器重建场景，避免触发器重复创建
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*
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* @param db SQLiteDatabase对象
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除旧触发器（如果存在）
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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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// 创建新触发器
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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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}
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/**
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* 初始化系统预设文件夹（通话记录、根目录、临时、回收站）
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* 向note表插入系统文件夹数据，类型为TYPE_SYSTEM
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*
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* @param db SQLiteDatabase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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* 1. 通话记录文件夹：存储通话记录笔记
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*/
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER); // 设置固定ID
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 类型为系统文件夹
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db.insert(TABLE.NOTE, null, values);
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/**
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* 2. 根文件夹：默认文件夹，存储无归属的笔记
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*/
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values.clear(); // 清空ContentValues
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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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* 3. 临时文件夹：用于移动笔记时的临时存储
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*/
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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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/**
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* 创建data表，初始化相关触发器和索引
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*
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* @param db SQLiteDatabase对象
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*/
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public void createDataTable(SQLiteDatabase db) {
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// 执行创建data表的SQL
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db.execSQL(CREATE_DATA_TABLE_SQL);
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// 重新创建data表的触发器
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reCreateDataTableTriggers(db);
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// 创建note_id索引，提升查询性能
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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data表的所有触发器（先删除旧触发器，再创建新触发器）
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*
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* @param db SQLiteDatabase对象
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|
*/
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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// 删除旧触发器
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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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// 创建新触发器
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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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|
/**
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|
* 获取NotesDatabaseHelper的单例实例（线程安全）
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|
* 采用synchronized关键字保证多线程环境下实例的唯一性，避免数据库锁问题
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|
*
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|
* @param context 上下文对象（建议使用Application Context，避免内存泄漏）
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|
* @return 全局唯一的NotesDatabaseHelper实例
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|
|
*/
|
|
|
static synchronized NotesDatabaseHelper getInstance(Context context) {
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|
|
// 懒汉式加载：实例为null时才创建
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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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|
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|
/**
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|
* 数据库首次创建时调用的方法
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|
* 执行note表和data表的创建逻辑
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|
|
*
|
|
|
* @param db SQLiteDatabase对象
|
|
|
*/
|
|
|
@Override
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|
public void onCreate(SQLiteDatabase db) {
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|
|
createNoteTable(db);
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|
|
createDataTable(db);
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|
|
}
|
|
|
|
|
|
/**
|
|
|
* 数据库版本升级时调用的方法
|
|
|
* 处理从旧版本（1/2/3）升级到新版本（4）的逻辑，包括表结构修改、数据迁移、触发器重建等
|
|
|
*
|
|
|
* @param db SQLiteDatabase对象
|
|
|
* @param oldVersion 旧数据库版本号
|
|
|
* @param newVersion 新数据库版本号
|
|
|
*/
|
|
|
@Override
|
|
|
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
|
|
|
// 是否需要重建触发器的标记
|
|
|
boolean reCreateTriggers = false;
|
|
|
// 是否跳过版本2升级的标记（版本1升级包含版本2的逻辑）
|
|
|
boolean skipV2 = false;
|
|
|
|
|
|
// 从版本1升级到版本2
|
|
|
if (oldVersion == 1) {
|
|
|
upgradeToV2(db);
|
|
|
skipV2 = true; // 版本1的升级已包含版本2到3的逻辑
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本2升级到版本3（未跳过的情况）
|
|
|
if (oldVersion == 2 && !skipV2) {
|
|
|
upgradeToV3(db);
|
|
|
reCreateTriggers = true; // 需要重建触发器
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本3升级到版本4
|
|
|
if (oldVersion == 3) {
|
|
|
upgradeToV4(db);
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本4升级到版本5
|
|
|
if (oldVersion == 4) {
|
|
|
// 为note表添加pinned字段（用于置顶功能）
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.PINNED
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
// 如果需要，重建触发器
|
|
|
if (reCreateTriggers) {
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
reCreateDataTableTriggers(db);
|
|
|
}
|
|
|
|
|
|
// 升级失败时抛出异常，提示版本升级错误
|
|
|
if (oldVersion != newVersion) {
|
|
|
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
|
|
+ "fails");
|
|
|
}
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
* 从版本1升级到版本2的逻辑
|
|
|
* 删除旧表，重新创建新表（全量重建，会丢失数据，适用于早期版本）
|
|
|
*
|
|
|
* @param db SQLiteDatabase对象
|
|
|
*/
|
|
|
private void upgradeToV2(SQLiteDatabase db) {
|
|
|
// 删除旧的note表和data表
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
|
|
|
// 重新创建表和初始化数据
|
|
|
createNoteTable(db);
|
|
|
createDataTable(db);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 从版本2升级到版本3的逻辑
|
|
|
* 1. 删除无用的触发器；
|
|
|
* 2. 为note表添加GTASK_ID列。
|
|
|
*
|
|
|
* @param db SQLiteDatabase对象
|
|
|
*/
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
// 删除无用的触发器（更新笔记修改时间的触发器）
|
|
|
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");
|
|
|
// 为note表添加GTASK_ID列（用于GTask同步）
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 从版本3升级到版本4的逻辑
|
|
|
* 为note表添加VERSION列（用于数据同步的版本控制）
|
|
|
*
|
|
|
* @param db SQLiteDatabase对象
|
|
|
*/
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
}
|
|
|
} |
