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@ -0,0 +1,337 @@
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// 该类继承自 SQLiteOpenHelper，用于管理笔记应用的数据库操作
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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// 数据库名称
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private static final String DB_NAME = "note.db";
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// 数据库版本
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private static final int DB_VERSION = 4;
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// 定义表名的接口
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public interface TABLE {
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public static final String NOTE = "note";
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public static final String DATA = "data";
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}
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// 日志标签
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private static final String TAG = "NotesDatabaseHelper";
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// 单例模式的实例
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private static NotesDatabaseHelper mInstance;
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// 创建笔记表的 SQL 语句
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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," +
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
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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," +
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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," +
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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")";
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// 创建数据（笔记内容）表的 SQL 语句
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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," +
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DataColumns.MIME_TYPE + " TEXT NOT NULL," +
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA1 + " INTEGER," +
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DataColumns.DATA2 + " INTEGER," +
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";
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// 创建数据表的笔记 ID 索引的 SQL 语句
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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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// 当笔记的父 ID 更新时，增加父文件夹笔记数量的触发器 SQL 语句
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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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// 当笔记的父 ID 更新时，减少父文件夹笔记数量的触发器 SQL 语句
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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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// 当插入新笔记到文件夹时，增加父文件夹笔记数量的触发器 SQL 语句
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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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// 当从文件夹删除笔记时，减少父文件夹笔记数量的触发器 SQL 语句
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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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// 当插入数据类型为笔记时，更新笔记内容的触发器 SQL 语句
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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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// 当数据类型为笔记的数据更新时，更新笔记内容的触发器 SQL 语句
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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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// 当数据类型为笔记的数据删除时，更新笔记内容的触发器 SQL 语句
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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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// 当笔记删除时，删除属于该笔记的数据的触发器 SQL 语句
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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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// 当文件夹删除时，删除属于该文件夹的笔记的触发器 SQL 语句
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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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// 当文件夹移动到回收站时，移动属于该文件夹的笔记的触发器 SQL 语句
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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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// 构造函数，调用父类的构造函数
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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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// 创建笔记表的方法，执行 SQL 语句，重建触发器，创建系统文件夹
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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reCreateNoteTableTriggers(db);
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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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// 重建笔记表触发器的方法，先删除旧触发器，再创建新触发器
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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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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db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
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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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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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// 创建系统文件夹的方法，向笔记表插入不同系统文件夹的记录
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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// 通话记录文件夹
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values.put(NoteColumns.ID, Notes.ID_CALL_RECORD_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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// 根文件夹
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values.clear();
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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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// 临时文件夹
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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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// 回收站文件夹
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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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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// 创建数据（笔记内容）表的方法，执行 SQL 语句，重建触发器，创建索引
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public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL);
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reCreateDataTableTriggers(db);
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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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// 重建数据（笔记内容）表触发器的方法，先删除旧触发器，再创建新触发器
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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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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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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// 获取单例的方法，确保只有一个实例存在
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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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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// 重写 onCreate 方法，创建数据库时调用创建笔记表和数据（笔记内容）表的方法
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@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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}
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// 重写 onUpgrade 方法，处理数据库升级
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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boolean reCreateTriggers = false;
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boolean skipV2 = false;
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if (oldVersion == 1) {
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upgradeToV2(db);
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skipV2 = true; // 这次升级包括从 v2 到 v3 的升级
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oldVersion++;
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}
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if (oldVersion == 2 &&!skipV2) {
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upgradeToV3(db);
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reCreateTriggers = true;
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oldVersion++;
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}
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if (oldVersion == 3) {
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upgradeToV4(db);
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oldVersion++;
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}
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if (reCreateTriggers) {
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reCreateNoteTableTriggers(db);
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reCreateDataTableTriggers(db);
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}
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if (oldVersion!= newVersion) {
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throw new IllegalStateException("Upgrade notes database to version " + newVersion
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+ "fails");
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}
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}
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// 升级到 v2 的方法，删除旧表，重新创建笔记表和数据（笔记内容）表
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private void upgradeToV2(SQLiteDatabase db) {
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
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createNoteTable(db);
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createDataTable(db);
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}
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// 升级到 v3 的方法，删除旧触发器，添加新列，插入回收站系统文件夹
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private void upgradeToV3(SQLiteDatabase db) {
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// 删除未使用的触发器
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
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// 添加 gtask id 列
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
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+ " TEXT NOT NULL DEFAULT ''");
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// 插入回收站系统文件夹
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ContentValues values = new ContentValues();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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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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// 升级到 v4 的方法，添加版本列
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private void upgradeToV4(SQLiteDatabase db) {
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
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+ " INTEGER NOT NULL DEFAULT 0");
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}
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}
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2201_75665698
8 months ago