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package net.micode.notes.data;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.util.Log;
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import net.micode.notes.data.Notes.DataColumns;
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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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* 便签数据库辅助类,管理SQLite数据库的创建、升级和表结构
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* 实现数据库单例模式,提供表创建、触发器管理、系统文件夹初始化等功能
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*/
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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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// 数据库版本号(用于版本升级判断)
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private static final int DB_VERSION = 4;
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/**
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* 表名接口
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* 定义数据库中的表名称常量
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*/
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public interface TABLE {
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public static final String NOTE = "note"; // 便签/文件夹表
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public static final String DATA = "data"; // 便签数据详情表
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}
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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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// ------------------------- 表结构定义 SQL -------------------------
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/**
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* 创建便签/文件夹表的SQL语句
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* 包含便签基础信息字段(ID、所属文件夹、时间、类型等)
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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," + // 主键ID
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父文件夹ID
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒时间
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID
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// 创建时间(默认值为当前时间戳,单位毫秒)
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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," + // 是否有附件
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// 最后修改时间(默认值为当前时间戳,单位毫秒)
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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," + // 文件夹内便签数量
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 便签内容/文件夹名称
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 类型(便签/文件夹/系统)
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 小部件ID
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 是否本地修改
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父ID
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google Tasks任务ID
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 数据版本号
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")";
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/**
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* 创建便签数据详情表的SQL语句
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* 存储便签的具体内容(如文本、通话记录等),通过MIME类型区分数据类型
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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," + // 主键ID
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DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型(标识数据类型)
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 所属便签ID
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// 创建时间(默认值为当前时间戳,单位毫秒)
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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// 最后修改时间(默认值为当前时间戳,单位毫秒)
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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 ''," + // 数据内容
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DataColumns.DATA1 + " INTEGER," + // 通用数据字段1(整型)
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DataColumns.DATA2 + " INTEGER," + // 通用数据字段2(整型)
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 通用数据字段3(文本)
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 通用数据字段4(文本)
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 通用数据字段5(文本)
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")";
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// ------------------------ 触发器定义 SQL -------------------------
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/**
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* 创建数据详情表的NOTE_ID索引
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* 优化根据便签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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/**
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* 触发器:当便签移动到新文件夹时,增加目标文件夹的便签数量
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* 触发时机:更新便签的父文件夹ID后
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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 + ";" + // new表示更新后的父文件夹ID
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" END";
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/**
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* 触发器:当便签移出文件夹时,减少原文件夹的便签数量
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* 触发时机:更新便签的父文件夹ID后
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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 + // old表示更新前的父文件夹ID
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" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + // 防止计数为负数
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" END";
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/**
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* 触发器:当新建便签时,增加所属文件夹的便签数量
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* 触发时机:插入新便签到表后
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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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/**
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* 触发器:当删除便签时,减少所属文件夹的便签数量
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* 触发时机:删除便签后
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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 + // old为被删除便签的原父文件夹ID
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" AND " + NoteColumns.NOTES_COUNT + ">0;" +
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" END";
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/**
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* 触发器:当插入文本便签数据时,更新便签的内容摘要
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* 触发时机:向data表插入MIME类型为文本便签的数据后
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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 + "'" + // 文本便签类型
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 将data表的content同步到note表的snippet
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
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" END";
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/**
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* 触发器:当更新文本便签数据时,更新便签的内容摘要
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* 触发时机:更新data表中MIME类型为文本便签的数据后
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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 + "'" + // 旧数据类型为文本便签
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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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* 触发器:当删除文本便签数据时,清空便签的内容摘要
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* 触发时机:删除data表中MIME类型为文本便签的数据后
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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 + "=''" + // 清空摘要
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
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" END";
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/**
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* 触发器:当删除便签时,级联删除其关联的数据详情
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* 触发时机:删除note表中的便签后
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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 + ";" + // 删除该便签的所有数据项
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" END";
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/**
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* 触发器:当删除文件夹时,级联删除其下的所有便签
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* 触发时机:删除note表中的文件夹后
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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 + ";" + // 删除该文件夹下的所有便签
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" END";
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/**
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* 触发器:当文件夹被移动到回收站时,将其下的便签同步移动到回收站
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* 触发时机:更新note表中的父文件夹ID为回收站ID后
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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 + // 新父ID为回收站ID
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 将该文件夹下的便签父ID设为回收站ID
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 旧父ID为被移动的文件夹ID
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" END";
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// ------------------------- 构造方法与单例 -------------------------
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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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/**
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* 获取数据库辅助类的单例实例
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* @param context 应用上下文
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* @return NotesDatabaseHelper实例
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*/
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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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// ------------------------- 表与数据初始化 -------------------------
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/**
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* 创建便签/文件夹表
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* @param db 数据库实例
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*/
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL); // 创建表结构
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reCreateNoteTableTriggers(db); // 创建触发器
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createSystemFolder(db); // 初始化系统文件夹
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Log.d(TAG, "note table has been created");
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}
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/**
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* 重新创建便签表相关的触发器(用于版本升级时重置触发器)
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* @param db 数据库实例
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 先删除旧触发器
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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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// 重新创建新触发器
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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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/**
|
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|
* 初始化系统文件夹(根目录、临时文件夹、通话记录文件夹、回收站)
|
|
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|
|
* @param db 数据库实例
|
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|
*/
|
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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(默认文件夹)
|
|
|
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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(无所属便签存放处)
|
|
|
|
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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);
|