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@ -27,189 +27,219 @@ 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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* 笔记数据库帮助类，负责数据库的创建、升级及触发器管理
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* 采用单例模式确保数据库连接的唯一性，封装了表结构定义、系统文件夹初始化等核心操作
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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// 数据库文件名
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private static final String DB_NAME = "note.db";
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// 数据库版本号，用于升级控制
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private static final int DB_VERSION = 4;
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/**
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* 数据库表名常量定义
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*/
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public interface TABLE {
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// 笔记表，存储笔记和文件夹的元数据
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public static final String NOTE = "note";
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// 数据表，存储笔记的具体内容（如文本、通话记录等）
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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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// 单例实例
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private static NotesDatabaseHelper mInstance;
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/**
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* 笔记表创建SQL语句
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* 包含笔记/文件夹的基本属性：ID、父文件夹ID、提醒时间、背景色、创建/修改时间等
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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," +
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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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"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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/**
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* 数据表创建SQL语句
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* 存储笔记的具体内容，支持多种类型（文本、通话记录等），通过MIME_TYPE区分
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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," +
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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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"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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/**
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* 为数据表的NOTE_ID字段创建索引
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* 优化根据笔记ID查询数据的性能
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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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"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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* Increase folder's note count when move note to the folder
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* 触发器：更新笔记父文件夹时，增加新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_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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"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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* Decrease folder's note count when move note from folder
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* 触发器：更新笔记父文件夹时，减少旧父文件夹的笔记计数
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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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"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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* Increase folder's note count when insert new note to the folder
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* 触发器：插入新笔记时，增加其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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"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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* Decrease folder's note count when delete note from the folder
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* 触发器：删除笔记时，减少其父文件夹的笔记计数
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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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"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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* Update note's content when insert data with type {@link DataConstants#NOTE}
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* 触发器：插入文本笔记数据时，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_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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"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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* Update note's content when data with {@link DataConstants#NOTE} type has changed
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* 触发器：更新文本笔记数据时，同步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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"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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* Update note's content when data with {@link DataConstants#NOTE} type has deleted
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* 触发器：删除文本笔记数据时，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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"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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* Delete datas belong to note which has been deleted
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* 触发器：删除笔记时，级联删除其关联的数据记录
|
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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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|
"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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* Delete notes belong to folder which has been deleted
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|
* 触发器：删除文件夹时，级联删除其包含的所有笔记
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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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|
"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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|
|
* Move notes belong to folder which has been moved to trash folder
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|
* 触发器：当文件夹被移到回收站时，其包含的所有笔记也自动移到回收站
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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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|
|
"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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|
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|
|
" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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|
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|
|
" END";
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 私有构造方法，防止外部实例化
|
|
|
|
|
* @param context 上下文对象
|
|
|
|
|
*/
|
|
|
|
|
public NotesDatabaseHelper(Context context) {
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|
|
|
super(context, DB_NAME, null, DB_VERSION);
|
|
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|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 创建笔记表并初始化相关触发器和系统文件夹
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
public void createNoteTable(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL(CREATE_NOTE_TABLE_SQL);
|
|
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
|
|
@ -217,6 +247,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
|
|
|
|
|
Log.d(TAG, "note table has been created");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 重新创建笔记表的所有触发器（先删除旧触发器再创建新的）
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
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");
|
|
|
|
|
@ -235,41 +269,41 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
|
|
|
|
|
db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 初始化系统文件夹（通话记录文件夹、根目录、临时文件夹、回收站）
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void createSystemFolder(SQLiteDatabase db) {
|
|
|
|
|
ContentValues values = new ContentValues();
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* call record foler for call notes
|
|
|
|
|
*/
|
|
|
|
|
// 通话记录文件夹：存储通话笔记
|
|
|
|
|
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
|
|
|
|
|
*/
|
|
|
|
|
// 根目录：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);
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* temporary folder which is used for moving note
|
|
|
|
|
*/
|
|
|
|
|
// 临时文件夹：用于移动笔记的中间存储
|
|
|
|
|
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
|
|
|
|
|
*/
|
|
|
|
|
// 回收站：存储被删除的笔记和文件夹
|
|
|
|
|
values.clear();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 创建数据表并初始化相关触发器和索引
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
public void createDataTable(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL(CREATE_DATA_TABLE_SQL);
|
|
|
|
|
reCreateDataTableTriggers(db);
|
|
|
|
|
@ -277,6 +311,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
|
|
|
|
|
Log.d(TAG, "data table has been created");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 重新创建数据表的所有触发器（先删除旧触发器再创建新的）
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
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");
|
|
|
|
|
@ -287,6 +325,11 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
|
|
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 获取单例实例
|
|
|
|
|
* @param context 上下文对象
|
|
|
|
|
* @return 数据库帮助类实例
|
|
|
|
|
*/
|
|
|
|
|
static synchronized NotesDatabaseHelper getInstance(Context context) {
|
|
|
|
|
if (mInstance == null) {
|
|
|
|
|
mInstance = new NotesDatabaseHelper(context);
|
|
|
|
|
@ -294,45 +337,64 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
|
|
|
|
|
return mInstance;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 数据库首次创建时调用，初始化表结构
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
@Override
|
|
|
|
|
public void onCreate(SQLiteDatabase db) {
|
|
|
|
|
createNoteTable(db);
|
|
|
|
|
createDataTable(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 数据库版本升级时调用
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
* @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;
|
|
|
|
|
boolean skipV2 = false;
|
|
|
|
|
|
|
|
|
|
// 版本1升级到版本2
|
|
|
|
|
if (oldVersion == 1) {
|
|
|
|
|
upgradeToV2(db);
|
|
|
|
|
skipV2 = true; // this upgrade including the upgrade from v2 to v3
|
|
|
|
|
skipV2 = true; // 此升级包含了从v2到v3的升级
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 版本2升级到版本3（跳过已包含在v1->v2中的情况）
|
|
|
|
|
if (oldVersion == 2 && !skipV2) {
|
|
|
|
|
upgradeToV3(db);
|
|
|
|
|
reCreateTriggers = true;
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 版本3升级到版本4
|
|
|
|
|
if (oldVersion == 3) {
|
|
|
|
|
upgradeToV4(db);
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 如果需要，重新创建触发器
|
|
|
|
|
if (reCreateTriggers) {
|
|
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
|
|
reCreateDataTableTriggers(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 验证升级是否完成
|
|
|
|
|
if (oldVersion != newVersion) {
|
|
|
|
|
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
|
|
|
|
+ "fails");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 升级到版本2：删除旧表并重新创建（结构调整）
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void upgradeToV2(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
|
|
|
|
|
@ -340,23 +402,31 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
|
|
|
|
|
createDataTable(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 升级到版本3：添加GTask ID字段和回收站文件夹
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
|
|
// drop unused triggers
|
|
|
|
|
// 删除未使用的触发器
|
|
|
|
|
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");
|
|
|
|
|
// add a column for gtask id
|
|
|
|
|
// 添加GTask ID字段，用于同步
|
|
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 升级到版本4：添加版本号字段，用于数据同步控制
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
