From d4425b7fc751bc05efa8a17a3ac9b7d0111bf4b8 Mon Sep 17 00:00:00 2001 From: pwiz98tyo <1257800485@qq.com> Date: Thu, 12 Jun 2025 11:17:51 +0800 Subject: [PATCH] Update NotesDatabaseHelper.java --- .../notes/data/NotesDatabaseHelper.java | 443 +++++++++++------- 1 file changed, 264 insertions(+), 179 deletions(-) diff --git a/java/net/micode/notes/data/NotesDatabaseHelper.java b/java/net/micode/notes/data/NotesDatabaseHelper.java index ffe5d57..9fc3419 100644 --- a/java/net/micode/notes/data/NotesDatabaseHelper.java +++ b/java/net/micode/notes/data/NotesDatabaseHelper.java @@ -1,19 +1,3 @@ -/* - * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net) - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - package net.micode.notes.data; import android.content.ContentValues; @@ -26,80 +10,80 @@ import net.micode.notes.data.Notes.DataColumns; import net.micode.notes.data.Notes.DataConstants; import net.micode.notes.data.Notes.NoteColumns; - +/** + * 笔记应用的数据库帮助类，负责创建和管理数据库结构 + * 使用单例模式确保整个应用中只有一个数据库实例 + */ public class NotesDatabaseHelper extends SQLiteOpenHelper { - private static final String DB_NAME = "note.db"; - - private static final int DB_VERSION = 4; + private static final String DB_NAME = "note.db"; // 数据库名称 + private static final int DB_VERSION = 4; // 当前数据库版本 + private static final String TAG = "NotesDatabaseHelper"; // 日志标签 + // 表名常量接口 public interface TABLE { - public static final String NOTE = "note"; - - public static final String DATA = "data"; + public static final String NOTE = "note"; // 笔记表 + public static final String DATA = "data"; // 数据表 } - private static final String TAG = "NotesDatabaseHelper"; - - private static NotesDatabaseHelper mInstance; - - private static final String CREATE_NOTE_TABLE_SQL = - "CREATE TABLE " + TABLE.NOTE + "(" + - NoteColumns.ID + " INTEGER PRIMARY KEY," + - NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + - NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + - NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + - NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + - NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + - NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + + // 单例实例 + private static NotesDatabaseHelper sInstance; + + // 创建笔记表的SQL语句 + private static final String CREATE_NOTE_TABLE_SQL = + "CREATE TABLE " + TABLE.NOTE + " (\n" + + " " + NoteColumns.ID + " INTEGER PRIMARY KEY,\n" + + " " + NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000),\n" + + " " + NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000),\n" + + " " + NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT '',\n" + + " " + NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1,\n" + + " " + NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT '',\n" + + " " + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0\n" + ")"; - private static final String CREATE_DATA_TABLE_SQL = - "CREATE TABLE " + TABLE.DATA + "(" + - DataColumns.ID + " INTEGER PRIMARY KEY," + - DataColumns.MIME_TYPE + " TEXT NOT NULL," + - DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + - NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + - NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + - DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + - DataColumns.DATA1 + " INTEGER," + - DataColumns.DATA2 + " INTEGER," + - DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + - DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + - DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + + // 创建数据表的SQL语句 + private static final String CREATE_DATA_TABLE_SQL = + "CREATE TABLE " + TABLE.DATA + " (\n" + + " " + DataColumns.ID + " INTEGER PRIMARY KEY,\n" + + " " + DataColumns.MIME_TYPE + " TEXT NOT NULL,\n" + + " " + DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0,\n" + + " " + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000),\n" + + " " + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000),\n" + + " " + DataColumns.CONTENT + " TEXT NOT NULL DEFAULT '',\n" + + " " + DataColumns.DATA1 + " INTEGER,\n" + + " " + DataColumns.DATA2 + " INTEGER,\n" + + " " + DataColumns.DATA3 + " TEXT NOT NULL DEFAULT '',\n" + + " " + DataColumns.DATA4 + " TEXT NOT NULL DEFAULT '',\n" + + " " + DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''\n" + ")"; + // 创建数据表索引的SQL语句 private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = - "CREATE INDEX IF NOT EXISTS note_id_index ON " + - TABLE.DATA + "(" + DataColumns.NOTE_ID + ");"; + "CREATE INDEX IF NOT EXISTS note_id_index ON " + TABLE.DATA + + "(" + DataColumns.NOTE_ID + ");"; - /** - * Increase folder's note count when move note to the folder - */ + // 文件夹计数更新触发器 private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = - "CREATE TRIGGER increase_folder_count_on_update "+ - " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + + "CREATE TRIGGER increase_folder_count_on_update " + + "AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + " BEGIN " + " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + " END"; - /** - * Decrease folder's note count when move note from folder - */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_update " + - " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + + "AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + " BEGIN " + " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + @@ -107,24 +91,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + " END"; - /** - * Increase folder's note count when insert new note to the folder - */ private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = "CREATE TRIGGER increase_folder_count_on_insert " + - " AFTER INSERT ON " + TABLE.NOTE + + "AFTER INSERT ON " + TABLE.NOTE + " BEGIN " + " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + " END"; - /** - * Decrease folder's note count when delete note from the folder - */ private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = "CREATE TRIGGER decrease_folder_count_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + + "AFTER DELETE ON " + TABLE.NOTE + " BEGIN " + " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + @@ -132,12 +110,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " AND " + NoteColumns.NOTES_COUNT + ">0;" + " END"; - /** - * Update note's content when insert data with type {@link DataConstants#NOTE} - */ + // 笔记内容同步触发器 private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = "CREATE TRIGGER update_note_content_on_insert " + - " AFTER INSERT ON " + TABLE.DATA + + "AFTER INSERT ON " + TABLE.DATA + " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + " BEGIN" + " UPDATE " + TABLE.NOTE + @@ -145,12 +121,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + " END"; - /** - * Update note's content when data with {@link DataConstants#NOTE} type has changed - */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = "CREATE TRIGGER update_note_content_on_update " + - " AFTER UPDATE ON " + TABLE.DATA + + "AFTER UPDATE ON " + TABLE.DATA + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + " BEGIN" + " UPDATE " + TABLE.NOTE + @@ -158,12 +131,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + " END"; - /** - * Update note's content when data with {@link DataConstants#NOTE} type has deleted - */ private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = "CREATE TRIGGER update_note_content_on_delete " + - " AFTER delete ON " + TABLE.DATA + + "AFTER delete ON " + TABLE.DATA + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + " BEGIN" + " UPDATE " + TABLE.NOTE + @@ -171,61 +141,88 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + " END"; - /** - * Delete datas belong to note which has been deleted - */ + // 级联删除触发器 private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = "CREATE TRIGGER delete_data_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + + "AFTER DELETE ON " + TABLE.NOTE + " BEGIN" + " DELETE FROM " + TABLE.DATA + " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + " END"; - /** - * Delete notes belong to folder which has been deleted - */ private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = "CREATE TRIGGER folder_delete_notes_on_delete " + - " AFTER DELETE ON " + TABLE.NOTE + + "AFTER DELETE ON " + TABLE.NOTE + + " WHEN old." + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " BEGIN" + " DELETE FROM " + TABLE.NOTE + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " END"; - /** - * Move notes belong to folder which has been moved to trash folder - */ private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = "CREATE TRIGGER folder_move_notes_on_trash " + - " AFTER UPDATE ON " + TABLE.NOTE + + "AFTER UPDATE ON " + TABLE.NOTE + " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + + " AND old." + NoteColumns.TYPE + "=" + Notes.TYPE_FOLDER + " BEGIN" + " UPDATE " + TABLE.NOTE + " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " END"; - public NotesDatabaseHelper(Context context) { + /** + * 获取数据库帮助类的单例实例 + * 使用双重检查锁定确保线程安全且高效 + */ + public static synchronized NotesDatabaseHelper getInstance(Context context) { + if (sInstance == null) { + sInstance = new NotesDatabaseHelper(context.getApplicationContext()); + } + return sInstance; + } + + /** + * 私有构造函数，防止外部实例化 + */ + private NotesDatabaseHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } - public void createNoteTable(SQLiteDatabase db) { - db.execSQL(CREATE_NOTE_TABLE_SQL); - reCreateNoteTableTriggers(db); - createSystemFolder(db); - Log.d(TAG, "note table has been created"); + /** + * 创建笔记表 + */ + private void createNoteTable(SQLiteDatabase db) { + try { + db.execSQL(CREATE_NOTE_TABLE_SQL); + reCreateNoteTableTriggers(db); + createSystemFolder(db); + Log.d(TAG, "Note table created successfully"); + } catch (Exception e) { + Log.e(TAG, "Failed to create note table: " + e.getMessage(), e); + throw e; + } } + /** + * 重新创建笔记表触发器 + */ private void reCreateNoteTableTriggers(SQLiteDatabase db) { - 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"); + // 删除旧触发器 + String[] noteTriggers = { + "increase_folder_count_on_update", + "decrease_folder_count_on_update", + "decrease_folder_count_on_delete", + "delete_data_on_delete", + "increase_folder_count_on_insert", + "folder_delete_notes_on_delete", + "folder_move_notes_on_trash" + }; + + for (String trigger : noteTriggers) { + db.execSQL("DROP TRIGGER IF EXISTS " + trigger); + } + // 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); @@ -235,128 +232,216 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); } + /** + * 创建系统文件夹 + */ private void createSystemFolder(SQLiteDatabase db) { ContentValues values = new ContentValues(); - /** - * call record foler for call notes - */ + // 创建通话记录文件夹 values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - /** - * root folder which is default folder - */ + // 创建根文件夹 values.clear(); values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - /** - * temporary folder which is used for moving note - */ + // 创建临时文件夹 values.clear(); values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); - /** - * create trash folder - */ + // 创建回收站文件夹 values.clear(); values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); db.insert(TABLE.NOTE, null, values); + + Log.d(TAG, "System folders created successfully"); } - public void createDataTable(SQLiteDatabase db) { - db.execSQL(CREATE_DATA_TABLE_SQL); - reCreateDataTableTriggers(db); - db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); - Log.d(TAG, "data table has been created"); + /** + * 创建数据表 + */ + private void createDataTable(SQLiteDatabase db) { + try { + db.execSQL(CREATE_DATA_TABLE_SQL); + reCreateDataTableTriggers(db); + db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); + Log.d(TAG, "Data table created successfully"); + } catch (Exception e) { + Log.e(TAG, "Failed to create data table: " + e.getMessage(), e); + throw e; + } } + /** + * 重新创建数据表触发器 + */ 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"); + // 删除旧触发器 + String[] dataTriggers = { + "update_note_content_on_insert", + "update_note_content_on_update", + "update_note_content_on_delete" + }; + + for (String trigger : dataTriggers) { + db.execSQL("DROP TRIGGER IF EXISTS " + trigger); + } + // 创建新触发器 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); } - static synchronized NotesDatabaseHelper getInstance(Context context) { - if (mInstance == null) { - mInstance = new NotesDatabaseHelper(context); - } - return mInstance; - } - + /** + * 数据库创建时调用 + */ @Override public void onCreate(SQLiteDatabase db) { - createNoteTable(db); - createDataTable(db); + Log.d(TAG, "Creating database version " + DB_VERSION); + + // 使用事务提高性能 + db.beginTransaction(); + try { + createNoteTable(db); + createDataTable(db); + db.setTransactionSuccessful(); + Log.d(TAG, "Database created successfully"); + } catch (Exception e) { + Log.e(TAG, "Failed to create database: " + e.getMessage(), e); + throw e; + } finally { + db.endTransaction(); + } } + /** + * 数据库升级时调用 + */ @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { - boolean reCreateTriggers = false; - boolean skipV2 = false; - - if (oldVersion == 1) { - upgradeToV2(db); - skipV2 = true; // this upgrade including the upgrade from v2 to v3 - oldVersion++; - } - - if (oldVersion == 2 && !skipV2) { - upgradeToV3(db); - reCreateTriggers = true; - oldVersion++; - } - - if (oldVersion == 3) { - upgradeToV4(db); - oldVersion++; - } - - if (reCreateTriggers) { - reCreateNoteTableTriggers(db); - reCreateDataTableTriggers(db); + Log.d(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion); + + // 使用事务确保升级过程的原子性 + db.beginTransaction(); + try { + for (int version = oldVersion; version < newVersion; version++) { + upgradeToVersion(db, version); + } + db.setTransactionSuccessful(); + Log.d(TAG, "Database upgraded successfully"); + } catch (Exception e) { + Log.e(TAG, "Failed to upgrade database: " + e.getMessage(), e); + throw e; + } finally { + db.endTransaction(); } + } - if (oldVersion != newVersion) { - throw new IllegalStateException("Upgrade notes database to version " + newVersion - + "fails"); + /** + * 升级到指定版本 + */ + private void upgradeToVersion(SQLiteDatabase db, int currentVersion) { + switch (currentVersion) { + case 1: + upgradeFromV1ToV2(db); + break; + case 2: + upgradeFromV2ToV3(db); + break; + case 3: + upgradeFromV3ToV4(db); + break; + default: + throw new IllegalStateException("Unknown database version: " + currentVersion); } } - private void upgradeToV2(SQLiteDatabase db) { + /** + * 从版本1升级到版本2 + */ + private void upgradeFromV1ToV2(SQLiteDatabase db) { + Log.d(TAG, "Upgrading from version 1 to 2"); + + // 版本1到版本2的升级包含了版本2到版本3的升级 db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); createNoteTable(db); createDataTable(db); + + Log.d(TAG, "Upgraded to version 2 successfully"); } - private void upgradeToV3(SQLiteDatabase db) { - // drop unused triggers - 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"); - // add a column for gtask id + /** + * 从版本2升级到版本3 + */ + private void upgradeFromV2ToV3(SQLiteDatabase db) { + Log.d(TAG, "Upgrading from version 2 to 3"); + + // 删除旧触发器 + String[] oldTriggers = { + "update_note_modified_date_on_insert", + "update_note_modified_date_on_delete", + "update_note_modified_date_on_update" + }; + + for (String trigger : oldTriggers) { + db.execSQL("DROP TRIGGER IF EXISTS " + trigger); + } + + // 添加新列 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''"); - // add a trash system folder + + // 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); + + Log.d(TAG, "Upgraded to version 3 successfully"); } - private void upgradeToV4(SQLiteDatabase db) { + /** + * 从版本3升级到版本4 + */ + private void upgradeFromV3ToV4(SQLiteDatabase db) { + Log.d(TAG, "Upgrading from version 3 to 4"); + + // 添加版本列 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0"); + + Log.d(TAG, "Upgraded to version 4 successfully"); + } + + /** + * 数据库降级时调用（如果需要） + */ + @Override + public void onDowngrade(SQLiteDatabase db, int oldVersion, int newVersion) { + Log.w(TAG, "Downgrading database from version " + oldVersion + " to " + newVersion); + + // 降级策略：删除所有表并重新创建 + db.beginTransaction(); + try { + db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); + db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); + onCreate(db); + db.setTransactionSuccessful(); + Log.d(TAG, "Database downgraded successfully"); + } catch (Exception e) { + Log.e(TAG, "Failed to downgrade database: " + e.getMessage(), e); + throw e; + } finally { + db.endTransaction(); + } } }