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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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* 实现了单例模式，确保全局唯一数据库实例
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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
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private static final int DB_VERSION = 4;
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/**
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* 数据库表名接口
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*/
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public interface TABLE {
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public static final String NOTE = "note"; // 便签表
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public static final String DATA = "data"; // 便签数据内容表
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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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// --------------------------- 表结构创建SQL ---------------------------
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/**
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* 创建便签表的SQL语句
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* 包含便签ID、父级文件夹ID、提醒时间、背景颜色、创建时间、是否有附件等字段
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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，默认0（根目录）
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒时间戳，默认0
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID，默认0
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// 创建时间戳，默认当前时间（秒转毫秒）
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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，默认0（无）
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// 修改时间戳，默认当前时间（秒转毫秒）
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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," + // 子便签数量，默认0
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 便签内容摘要，默认空
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 类型（0=便签，1=文件夹，2=系统）
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 桌面小部件ID，默认0
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型，默认-1（无效）
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID，默认0
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +// 本地修改标志，默认0
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +// 原始父ID，默认0
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google任务ID，默认空
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号，默认0
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")";
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/**
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* 创建便签数据内容表的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（如文本便签、通话记录）
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 所属便签ID，默认0
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// 创建时间戳，默认当前时间（秒转毫秒）
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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// 修改时间戳，默认当前时间（秒转毫秒）
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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，默认空
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DataColumns.DATA1 + " INTEGER," + // 通用整数型字段1
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DataColumns.DATA2 + " INTEGER," + // 通用整数型字段2
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 通用文本型字段3
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 通用文本型字段4
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 通用文本型字段5
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")";
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// --------------------------- 索引与触发器 ---------------------------
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/**
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* 创建数据表里note_id字段的索引，加速查询
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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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*/
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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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*/
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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：当新便签插入文件夹时，增加目标文件夹的便签数量
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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 + ";" + // new表示插入的便签父ID
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" END";
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/**
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* 触发器：当便签从文件夹删除时，减少原文件夹的便签数量
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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表示删除的便签父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，更新便签表的摘要内容
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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 + "'" + // 仅处理文本便签类型
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 将数据内容同步到便签摘要
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + // 关联便签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，更新便签表的摘要内容
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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 + "'" + // 仅处理文本便签类型
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 同步新内容到摘要
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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，清空便签表的摘要内容
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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 + "'" + // 仅处理文本便签类型
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" BEGIN" +
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" UPDATE " + TABLE.NOTE +
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" SET " + NoteColumns.SNIPPET + "=''" + // 清空摘要
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + // 关联被删除数据的便签ID
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" END";
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/**
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* 触发器：当便签被删除时，级联删除其关联的数据内容
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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 + ";" + // 删除属于该便签的数据
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" END";
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/**
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* 触发器：当文件夹被删除时，级联删除其下所有便签
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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 + ";" + // 删除父ID为被删除文件夹的便签
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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，递归移动其下所有便签到回收站
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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 + // 父ID变为回收站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 + // 子便签父ID同步为回收站ID
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 原父ID为当前文件夹ID
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" END";
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// --------------------------- 构造方法与初始化 ---------------------------
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/**
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* 构造方法，调用父类SQLiteOpenHelper初始化
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* @param context 上下文对象
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*/
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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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* 创建便签表并初始化触发器和系统文件夹
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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"); // 日志记录
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}
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/**
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* 重建便签表相关触发器（用于版本升级时重置）
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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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* 创建系统默认文件夹（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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|
*/
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|
|
|
|
private void createSystemFolder(SQLiteDatabase db) {
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|
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|
ContentValues values = new ContentValues();
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|
|
|
|
|
|
|
|
// 创建通话记录文件夹
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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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|
|
// 创建根文件夹
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|
|
values.clear();
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|
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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);
|
|
|
|
|
|
|
|
|
|
// 创建临时文件夹
|
|
|
|
|
values.clear();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
|
|
|
|
|
// 创建回收站文件夹
|
|
|
|
|
values.clear();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 创建便签数据内容表并初始化触发器和索引
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
public void createDataTable(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL(CREATE_DATA_TABLE_SQL); // 创建表结构
|
|
|
|
|
reCreateDataTableTriggers(db); // 创建触发器
|
|
|
|
|
db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建索引
|
|
|
|
|
Log.d(TAG, "data table has been created"); // 日志记录
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 重建数据内容表相关触发器（用于版本升级时重置）
|
|
|
|
|
* @param db 数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void reCreateDataTableTriggers(SQLiteDatabase db) {
|
|
|
|
|
// 先删除旧触发器
|
|
|
|
|
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");
|
|
|
|
|
// 重新创建新触发器
|
|
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
|
|
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIG
|
