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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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* 便签应用的数据库核心帮助类，负责数据库的创建、升级和维护
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* <p>
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* 核心职责：
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* <ul>
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* <li>负责 "note.db" 数据库的创建 ({@link #onCreate})</li>
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* <li>负责数据库版本升级与数据迁移 ({@link #onUpgrade})</li>
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* <li>定义表名常量（如 {@link TABLE#NOTE}）供外部调用</li>
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* <li>维护 SQL Triggers 以保证数据一致性（如文件夹计数更新）</li>
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* <li>提供单例实例，确保数据库连接的高效管理</li>
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* <li>创建和维护系统文件夹（根文件夹、临时文件夹、通话记录文件夹、回收站）</li>
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* </ul>
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* <p>
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* 设计意图：
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* <ul>
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* <li>采用单例模式，避免频繁创建和销毁数据库连接</li>
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* <li>使用SQL Triggers自动维护数据一致性，减少应用层逻辑复杂度</li>
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* <li>提供清晰的版本升级机制，支持平滑的数据迁移</li>
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* <li>将数据库结构定义集中管理，便于维护和扩展</li>
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* <li>支持多种便签类型和关联数据存储</li>
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* </ul>
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* <p>
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* 继承关系：
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* <ul>
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* <li>直接继承自 {@link SQLiteOpenHelper}，利用Android系统提供的数据库管理机制</li>
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* </ul>
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* <p>
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* 与其他类的关键关联：
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* <ul>
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* <li>被 {@link NotesProvider} 使用，作为Content Provider的底层数据存储</li>
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* <li>使用 {@link Notes} 类中定义的常量和列名，确保数据一致性</li>
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* <li>为整个应用提供统一的数据库访问入口</li>
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* </ul>
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* <p>
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* 数据一致性保障：
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* <ul>
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* <li>使用SQL Triggers自动更新文件夹的便签计数</li>
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* <li>实现级联删除，确保数据完整性</li>
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* <li>自动更新便签的摘要内容</li>
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* <li>支持回收站功能，实现安全删除</li>
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* </ul>
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*
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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/**
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* 数据库名称常量
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* <p>数据库文件名：note.db</p>
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*/
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private static final String DB_NAME = "note.db";
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/**
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* 数据库当前版本号
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* <p>
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* <strong>警告：</strong>
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* 任何表结构的修改（如 addColumn）或 Trigger 逻辑的变更，都必须手动 +1。
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* 这将导致系统自动调用 {@link #onUpgrade} 方法，执行相应的数据迁移操作。
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* </p>
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* <p>
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* 版本历史：
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* <ul>
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* <li>版本1：初始版本</li>
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* <li>版本2：完全重建数据库</li>
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* <li>版本3：添加Google Task ID支持并添加回收站文件夹</li>
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* <li>版本4：添加版本号字段</li>
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* </ul>
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* </p>
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*/
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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，定义数据库中所有表的名称
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* <p>
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* 设计意图：
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* <ul>
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* <li>集中管理表名常量，避免硬编码</li>
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* <li>提供统一的表名访问入口，便于维护和扩展</li>
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* <li>被外部类如{@link NotesProvider}使用，确保表名一致性</li>
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* </ul>
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*/
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public interface TABLE {
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/**
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* 笔记表，存储便签和文件夹的基本信息
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* <p>包含字段：ID、PARENT_ID、ALERTED_DATE、BG_COLOR_ID、CREATED_DATE等</p>
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*/
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public static final String NOTE = "note";
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/**
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* 数据表，存储便签的详细内容数据
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* <p>包含字段：ID、MIME_TYPE、NOTE_ID、CONTENT、DATA1-DATA5等</p>
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*/
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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，用于调试和日志记录
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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，确保整个应用只有一个数据库连接实例
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* <p>
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* 设计意图：
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* <ul>
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* <li>避免频繁创建和销毁数据库连接，提高性能</li>
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* <li>确保数据库操作的线程安全</li>
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* <li>通过{@link #getInstance(Context)}方法获取实例</li>
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* </ul>
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*/
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private static NotesDatabaseHelper mInstance;
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/**
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* 创建笔记表的SQL语句
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* 包含笔记的基本信息字段：ID、父文件夹ID、提醒日期、背景颜色、创建日期等
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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," + // 父文件夹ID，默认为0
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒日期时间戳
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期，默认为当前时间
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期，默认为当前时间
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 笔记数量（用于文件夹）
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 内容摘要
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 类型（笔记/文件夹/系统文件夹等）
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的小部件ID
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID
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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," + // 原始父文件夹ID
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google Task 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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* 创建数据表的SQL语句
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* 存储笔记的具体内容数据，支持多种MIME类型（文本、图片等）
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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," + // MIME类型，标识数据类型
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的笔记ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 内容
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DataColumns.DATA1 + " INTEGER," + // 扩展字段1（整数）
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DataColumns.DATA2 + " INTEGER," + // 扩展字段2（整数）
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 扩展字段3（文本）
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 扩展字段4（文本）
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 扩展字段5（文本）
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")";
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/**
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* 在数据表的note_id字段上创建索引，提高查询性能
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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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* SQL 触发器：移动笔记时自动增加目标文件夹计数
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* <p>
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* <strong>逻辑解析：</strong><br>
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* 1. 监听 {@link TABLE#NOTE} 表的 {@link NoteColumns#PARENT_ID} 字段。<br>
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* 2. 捕捉更新后的新文件夹 ID (new.parent_id)。<br>
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* 3. 将该目标文件夹的 'note_count' 字段 +1。
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* </p>
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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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* SQL 触发器：当笔记从文件夹移出时，减少原文件夹的笔记计数
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* 注意：只减少计数大于0的文件夹
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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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* SQL 触发器：插入新笔记时增加父文件夹的笔记计数
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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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* SQL 触发器：删除笔记时减少父文件夹的笔记计数
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* 注意：只减少计数大于0的文件夹
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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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* SQL 触发器：当插入类型为NOTE的数据时，更新对应笔记的摘要内容
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* 仅当MIME_TYPE为DataConstants.NOTE时触发
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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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* SQL 触发器：当更新类型为NOTE的数据时，更新对应笔记的摘要内容
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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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* SQL 触发器：当删除类型为NOTE的数据时，清空对应笔记的摘要内容
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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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* SQL 触发器：删除笔记时，级联删除其关联的所有数据
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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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* SQL 触发器：删除文件夹时，级联删除其下的所有笔记
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* 注意：这会触发delete_data_on_delete触发器，从而删除所有关联数据
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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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* SQL 触发器：当文件夹被移动到回收站时，将其下的所有笔记也移动到回收站
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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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* 构造方法
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* @param context Android上下文
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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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|
|
}
|
|
|
|
|
|
/**
|
|
|
* 创建笔记表及其相关触发器
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
public void createNoteTable(SQLiteDatabase db) {
|
|
|
db.execSQL(CREATE_NOTE_TABLE_SQL);
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
createSystemFolder(db);
|
|
|
Log.d(TAG, "note table has been created");
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 重建笔记表的所有触发器
|
|
|
* 先删除旧触发器（如果存在），然后创建新触发器
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
private void reCreateNoteTableTriggers(SQLiteDatabase db) {
|
|
|
// 删除所有旧触发器
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_delete");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS delete_data_on_delete");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_insert");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
|
|
|
|
|
|
// 创建新触发器
|
|
|
db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
|
|
|
db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
|
|
|
db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
|
|
|
db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
|
|
|
db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
|
|
|
db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
|
|
|
db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 创建系统文件夹
|
|
|
* 包括：通话记录文件夹、根文件夹、临时文件夹、回收站
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
private void createSystemFolder(SQLiteDatabase db) {
|
|
|
ContentValues values = new ContentValues();
|
|
|
|
|
|
/**
|
|
|
* 通话记录文件夹
|
|
|
*/
|
|
|
values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER);
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
|
/**
|
|
|
* 根文件夹（默认文件夹）
|
|
|
*/
|
|
|
values.clear();
|
|
|
values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
|
/**
|
|
|
* 临时文件夹（用于笔记移动操作）
|
|
|
*/
|
|
|
values.clear();
|
|
|
values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
|
/**
|
|
|
* 回收站文件夹
|
|
|
*/
|
|
|
values.clear();
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 创建数据表及其相关触发器
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
public void createDataTable(SQLiteDatabase db) {
|
|
|
db.execSQL(CREATE_DATA_TABLE_SQL);
|
|
|
reCreateDataTableTriggers(db);
|
|
|
db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引提高查询性能
|
|
|
Log.d(TAG, "data table has been created");
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 重建数据表的所有触发器
|
|
|
* 先删除旧触发器（如果存在），然后创建新触发器
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
private void reCreateDataTableTriggers(SQLiteDatabase db) {
|
|
|
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");
|
|
|
|
|
|
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);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 获取单例实例（线程安全）
|
|
|
* @param context Android上下文
|
|
|
* @return NotesDatabaseHelper实例
|
|
|
*/
|
|
|
static synchronized NotesDatabaseHelper getInstance(Context context) {
|
|
|
if (mInstance == null) {
|
|
|
mInstance = new NotesDatabaseHelper(context);
|
|
|
}
|
|
|
return mInstance;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 数据库首次创建时调用
|
|
|
* 创建所有表和触发器
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
@Override
|
|
|
public void onCreate(SQLiteDatabase db) {
|
|
|
createNoteTable(db);
|
|
|
createDataTable(db);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* 数据库版本升级时调用
|
|
|
* 处理不同版本间的数据迁移和结构变更
|
|
|
* @param db SQLite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; // 是否需要重建触发器
|
|
|
boolean skipV2 = false; // 是否跳过V2升级
|
|
|
|
|
|
// 从版本1升级到版本2
|
|
|
if (oldVersion == 1) {
|
|
|
upgradeToV2(db);
|
|
|
skipV2 = true; // V1到V2的升级包含了V2到V3的内容
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本2升级到版本3（如果未跳过）
|
|
|
if (oldVersion == 2 && !skipV2) {
|
|
|
upgradeToV3(db);
|
|
|
reCreateTriggers = true; // V3升级需要重建触发器
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 从版本3升级到版本4
|
|
|
if (oldVersion == 3) {
|
|
|
upgradeToV4(db);
|
|
|
oldVersion++;
|
|
|
}
|
|
|
|
|
|
// 如果需要，重建所有触发器
|
|
|
if (reCreateTriggers) {
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
reCreateDataTableTriggers(db);
|
|
|
}
|
|
|
|
|
|
// 版本号检查，确保升级完成
|
|
|
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
|
|
|
* @param db SQLite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 Task ID支持并添加回收站文件夹
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
// 删除不再使用的触发器
|
|
|
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 Task ID字段
|
|
|
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：添加版本号字段
|
|
|
* @param db SQLite数据库对象
|
|
|
*/
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
// 添加版本号字段
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
}
|
|
|
} |
