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Update NotesDatabaseHelper.java

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pwiz98tyo 2 months ago
parent 7c094b4fdb
commit d4425b7fc7
1 changed files with 264 additions and 179 deletions
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java/net/micode/notes/data/NotesDatabaseHelper.java
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@ -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();
}
}
}

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