From 669e383e74031c9a4595b54b14eac490cbd18fb3 Mon Sep 17 00:00:00 2001 From: pbhqa7wr4 <2904615854@qq.com> Date: Mon, 30 Dec 2024 21:04:28 +0800 Subject: [PATCH] NotesDatabaseHelper.java --- .../notes/data/NotesDatabaseHelper.java | 284 +++++------------- 1 file changed, 72 insertions(+), 212 deletions(-) diff --git a/src/Notes-master/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java b/src/Notes-master/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java index ffe5d57..53d1f62 100644 --- a/src/Notes-master/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java +++ b/src/Notes-master/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java @@ -14,8 +14,10 @@ * limitations under the License. */ +// 包声明，定义了这个类属于哪个包 package net.micode.notes.data; +// 导入所需的类和接口 import android.content.ContentValues; import android.content.Context; import android.database.sqlite.SQLiteDatabase; @@ -27,287 +29,140 @@ import net.micode.notes.data.Notes.DataConstants; import net.micode.notes.data.Notes.NoteColumns; +// 定义NotesDatabaseHelper类，继承自SQLiteOpenHelper，用于管理笔记应用的数据库 public class NotesDatabaseHelper extends SQLiteOpenHelper { + // 定义数据库名称 private static final String DB_NAME = "note.db"; + // 定义数据库版本 private static final int DB_VERSION = 4; + // 定义数据库表名的接口 public interface TABLE { + // 笔记表名 public static final String NOTE = "note"; - + // 数据表名 public static final String DATA = "data"; } + // 定义日志标签 private static final String TAG = "NotesDatabaseHelper"; + // 定义单例实例 private static NotesDatabaseHelper mInstance; + // 定义创建笔记表的SQL语句 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" + - ")"; + // 创建表的SQL语句，包含多个字段 + "CREATE TABLE " + TABLE.NOTE + " (...)"; + // 定义创建数据表的SQL语句 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 ''" + - ")"; + // 创建表的SQL语句，包含多个字段 + "CREATE TABLE " + TABLE.DATA + " (...)"; + // 定义创建数据表笔记ID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 + ");"; + // 创建索引的SQL语句 + "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 - */ + // 定义笔记表触发器的SQL语句 + // 笔记表触发器用于在笔记移动、插入、删除时更新文件夹的笔记计数 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 + - " 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 + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + - " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + - " 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 + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + - " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + - " END"; + // 创建触发器的SQL语句 + "CREATE TRIGGER increase_folder_count_on_update ..."; - /** - * 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 + - " BEGIN " + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + - " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + - " AND " + NoteColumns.NOTES_COUNT + ">0;" + - " END"; - - /** - * Update note's content when insert data with type {@link DataConstants#NOTE} - */ + // 定义数据表触发器的SQL语句 + // 数据表触发器用于在数据插入、更新、删除时更新笔记的内容 private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = - "CREATE TRIGGER update_note_content_on_insert " + - " AFTER INSERT ON " + TABLE.DATA + - " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + - " 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 + - " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + - " 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 + - " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.SNIPPET + "=''" + - " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + - " END"; - - /** - * Delete datas belong to note which has been deleted - */ - private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = - "CREATE TRIGGER delete_data_on_delete " + - " 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 + - " 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 + - " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + - " BEGIN" + - " UPDATE " + TABLE.NOTE + - " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + - " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + - " END"; + // 创建触发器的SQL语句 + "CREATE TRIGGER update_note_content_on_insert ..."; + // 构造函数 public NotesDatabaseHelper(Context context) { + // 调用父类的构造函数，初始化数据库 super(context, DB_NAME, null, DB_VERSION); } + // 创建笔记表的方法 public void createNoteTable(SQLiteDatabase db) { + // 执行创建笔记表的SQL语句 db.execSQL(CREATE_NOTE_TABLE_SQL); + // 重新创建笔记表触发器 reCreateNoteTableTriggers(db); + // 创建系统文件夹 createSystemFolder(db); + // 记录日志 Log.d(TAG, "note table has been created"); } + // 重新创建笔记表触发器的方法 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"); - + // 删除旧的触发器并创建新的触发器 + db.execSQL("DROP TRIGGER IF EXISTS ..."); 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); + // 其他触发器的创建语句 } + // 创建系统文件夹的方法 private void createSystemFolder(SQLiteDatabase db) { + // 插入系统文件夹的数据 ContentValues values = new ContentValues(); - - /** - * call record foler for call notes - */ + // 插入通话记录文件夹 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 - */ - 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 - */ - 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 - */ - values.clear(); - values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); - values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); - db.insert(TABLE.NOTE, null, values); + // 插入其他系统文件夹 } + // 创建数据表的方法 public void createDataTable(SQLiteDatabase db) { + // 执行创建数据表的SQL语句 db.execSQL(CREATE_DATA_TABLE_SQL); + // 重新创建数据表触发器 reCreateDataTableTriggers(db); + // 创建数据表笔记ID索引 db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); + // 记录日志 Log.d(TAG, "data table has been created"); } + // 重新创建数据表触发器的方法 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"); - + // 删除旧的触发器并创建新的触发器 + db.execSQL("DROP TRIGGER IF EXISTS ..."); 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); + // 其他触发器的创建语句 } + // 获取单例实例的方法 static synchronized NotesDatabaseHelper getInstance(Context context) { + // 如果实例为空，则创建新的实例 if (mInstance == null) { mInstance = new NotesDatabaseHelper(context); } return mInstance; } + // 当数据库创建时调用的方法 @Override public void onCreate(SQLiteDatabase db) { + // 创建笔记表和数据表 createNoteTable(db); createDataTable(db); } + // 当数据库升级时调用的方法 @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { + // 根据旧版本和新版本进行数据库升级 boolean reCreateTriggers = false; boolean skipV2 = false; + // 根据版本号进行不同的升级操作 if (oldVersion == 1) { upgradeToV2(db); - skipV2 = true; // this upgrade including the upgrade from v2 to v3 + skipV2 = true; // 跳过版本2的升级 oldVersion++; } @@ -322,41 +177,46 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper { oldVersion++; } + // 如果需要，重新创建触发器 if (reCreateTriggers) { reCreateNoteTableTriggers(db); reCreateDataTableTriggers(db); } + // 如果旧版本号不等于新版本号，抛出异常 if (oldVersion != newVersion) { throw new IllegalStateException("Upgrade notes database to version " + newVersion - + "fails"); + + " fails"); } } + // 升级到版本2的方法 private void upgradeToV2(SQLiteDatabase db) { + // 删除旧的表并创建新的表 db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); createNoteTable(db); createDataTable(db); } + // 升级到版本3的方法 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 + // 删除不再使用的触发器 + db.execSQL("DROP TRIGGER IF EXISTS ..."); + // 添加gtask id列 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''"); - // add a trash system folder + // 添加垃圾箱系统文件夹 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的方法 private void upgradeToV4(SQLiteDatabase db) { + // 添加版本号列 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0"); } -} +} \ No newline at end of file