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@ -1,387 +0,0 @@
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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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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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// 定义一个数据库帮助类，继承自 SQLiteOpenHelper
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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，用于数据库升级操作
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private static final int DB_VERSION = 4;
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// 定义表的接口
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public interface TABLE {
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// 笔记表名称
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public static final String NOTE = "note";
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// 数据表名称
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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，用于确保数据库帮助类在整个应用中只有一个实例
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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," + // 笔记ID，主键
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父文件夹ID，默认为0
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒日期，默认为0
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID，默认为0
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期，默认为当前时间
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件，默认为0
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期，默认为当前时间
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 笔记数量，默认为0
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 笔记内容摘要，默认为空
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 笔记类型，默认为0
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 小部件ID，默认为0
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型，默认为-1
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID，默认为0
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 是否本地修改，默认为0
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父文件夹ID，默认为0
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google任务ID，默认为空
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号，默认为0
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")";
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// 创建数据表的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," + // 数据ID，主键
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DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型，默认为0
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的笔记ID，默认为0
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期，默认为当前时间
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期，默认为当前时间
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 数据内容，默认为空
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DataColumns.DATA1 + " INTEGER," + // 数据字段1，整型
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DataColumns.DATA2 + " INTEGER," + // 数据字段2，整型
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 数据字段3，默认为空
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 数据字段4，默认为空
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 数据字段5，默认为空
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")";
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// 创建数据表的索引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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/**
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* 当笔记移动到文件夹时，增加文件夹的笔记数量
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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 "+ // 创建触发器
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + // 在笔记表的PARENT_ID更新后
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" BEGIN " +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + // 笔记数量加1
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + // 父文件夹ID等于新笔记的PARENT_ID
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" END";
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/**
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* 当笔记从文件夹移动时，减少文件夹的笔记数量
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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 " + // 创建触发器
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + // 在笔记表的PARENT_ID更新后
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" BEGIN " +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + // 笔记数量减1
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + // 文件夹ID等于旧笔记的PARENT_ID
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" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + // 仅当笔记数量大于0时更新
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" END";
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/**
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* 当插入新笔记时，增加文件夹的笔记数量
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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 " + // 创建触发器
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" AFTER INSERT ON " + TABLE.NOTE + // 在笔记表插入新数据后
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" BEGIN " +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + // 笔记数量加1
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + // 文件夹ID等于新笔记的PARENT_ID
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" END";
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/**
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* 当删除笔记时，减少文件夹的笔记数量
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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 " + // 创建触发器
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" AFTER DELETE ON " + TABLE.NOTE + // 在笔记表删除数据后
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" BEGIN " +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + // 笔记数量减1
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" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + // 文件夹ID等于旧笔记的PARENT_ID
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" AND " + NoteColumns.NOTES_COUNT + ">0;" + // 仅当笔记数量大于0时更新
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" END";
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/**
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* 当插入类型为 {@link DataConstants#NOTE} 的数据时，更新笔记的内容摘要
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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 " + // 创建触发器
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" AFTER INSERT ON " + TABLE.DATA + // 在数据表插入新数据后
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" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅当MIME类型为NOTE时
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" BEGIN" +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 笔记摘要设置为新数据的内容
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + // 笔记ID等于新数据的NOTE_ID
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" END";
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/**
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* 当类型为 {@link DataConstants#NOTE} 的数据更新时，更新笔记的内容摘要
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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 " + // 创建触发器
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" AFTER UPDATE ON " + TABLE.DATA + // 在数据表更新数据后
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅当旧数据的MIME类型为NOTE时
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" BEGIN" +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + // 笔记摘要设置为新数据的内容
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" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + // 笔记ID等于新数据的NOTE_ID
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" END";
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/**
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* 当类型为 {@link DataConstants#NOTE} 的数据删除时，清空笔记的内容摘要
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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 " + // 创建触发器
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" AFTER delete ON " + TABLE.DATA + // 在数据表删除数据后
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" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + // 仅当旧数据的MIME类型为NOTE时
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" BEGIN" +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.SNIPPET + "=''" + // 清空笔记摘要
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" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + // 笔记ID等于旧数据的NOTE_ID
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" END";
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/**
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* 当删除笔记时，删除关联的数据
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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 " + // 创建触发器
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" AFTER DELETE ON " + TABLE.NOTE + // 在笔记表删除数据后
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" BEGIN" +
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" DELETE FROM " + TABLE.DATA + // 从数据表中删除数据
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" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + // 笔记ID等于被删除笔记的ID
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" END";
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/**
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* 当删除文件夹时，删除该文件夹下的所有笔记
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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 " + // 创建触发器
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" AFTER DELETE ON " + TABLE.NOTE + // 在笔记表删除数据后
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" BEGIN" +
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" DELETE FROM " + TABLE.NOTE + // 从笔记表中删除数据
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 父文件夹ID等于被删除文件夹的ID
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" END";
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/**
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* 当文件夹移动到回收站时，将该文件夹下的所有笔记的父文件夹ID设置为回收站ID
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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 " + // 创建触发器
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" AFTER UPDATE ON " + TABLE.NOTE + // 在笔记表的PARENT_ID更新后
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" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 仅当新的PARENT_ID为回收站ID时
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" BEGIN" +
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" UPDATE " + TABLE.NOTE + // 更新笔记表
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" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + // 笔记的父文件夹ID设置为回收站ID
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + // 笔记的父文件夹ID等于旧数据的文件夹ID
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" END";
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// 构造函数，用于初始化数据库名称、版本号等
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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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// 创建笔记表和相关触发器
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL); // 执行创建笔记表的SQL语句
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reCreateNoteTableTriggers(db); // 重新创建笔记表的触发器
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createSystemFolder(db); // 创建系统文件夹
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Log.d(TAG, "note table has been created"); // 输出日志信息
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}
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// 重新创建笔记表的触发器
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除旧的触发器
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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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|
// 创建新的触发器
|
|
|
|
|
db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
|
|
|
|
|
db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
|
|
|
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|
db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
|
|
|
|
|
db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);
|
|
|
|
|
db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);
|
|
|
|
|
db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
|
|
|
|
|
db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
|
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|
|
|
}
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|
|
// 创建系统文件夹
|
|
|
|
|
private void createSystemFolder(SQLiteDatabase db) {
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|
|
ContentValues values = new ContentValues();
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|
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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); // 设置笔记ID为通话记录文件夹ID
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|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置笔记类型为系统类型
|
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|
|
|
db.insert(TABLE.NOTE, null, values); // 插入数据到笔记表
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|
// 创建根文件夹
|
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|
|
values.clear();
|
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|
|
values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); // 设置笔记ID为根文件夹ID
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|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置笔记类型为系统类型
|
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|
|
|
db.insert(TABLE.NOTE, null, values); // 插入数据到笔记表
|
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|
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|
|
// 创建临时文件夹
|
|
|
|
|
values.clear();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); // 设置笔记ID为临时文件夹ID
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置笔记类型为系统类型
|
|
|
|
|
db.insert(TABLE.NOTE, null, values); // 插入数据到笔记表
|
|
|
|
|
|
|
|
|
|
// 创建回收站文件夹
|
|
|
|
|
values.clear();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); // 设置笔记ID为回收站文件夹ID
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置笔记类型为系统类型
|
|
|
|
|
db.insert(TABLE.NOTE, null, values); // 插入数据到笔记表
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 创建数据表和相关触发器
|
|
|
|
|
public void createDataTable(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL(CREATE_DATA_TABLE_SQL); // 执行创建数据表的SQL语句
|
|
|
|
|
reCreateDataTableTriggers(db); // 重新创建数据表的触发器
|
|
|
|
|
db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL); // 创建数据表的索引
|
|
|
|
|
Log.d(TAG, "data table has been created"); // 输出日志信息
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 重新创建数据表的触发器
|
|
|
|
|
private void reCreateDataTableTriggers(SQLiteDatabase db) {
|
|
|
|
|
// 删除旧的触发器
|
|
|
|
|
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");
|
|
|
|
|
|
|
|
|
|
// 创建新的触发器
|
|
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
|
|
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
|
|
|
|
|
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 获取单例实例的方法
|
|
|
|
|
static synchronized NotesDatabaseHelper getInstance(Context context) {
|
|
|
|
|
if (mInstance == null) { // 如果单例实例为空
|
|
|
|
|
mInstance = new NotesDatabaseHelper(context); // 创建新的数据库帮助类实例
|
|
|
|
|
}
|
|
|
|
|
return mInstance; // 返回单例实例
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 重写父类的onCreate方法，在数据库第一次创建时执行
|
|
|
|
|
@Override
|
|
|
|
|
public void onCreate(SQLiteDatabase db) {
|
|
|
|
|
createNoteTable(db); // 创建笔记表
|
|
|
|
|
createDataTable(db); // 创建数据表
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 重写父类的onUpgrade方法，在数据库版本升级时执行
|
|
|
|
|
@Override
|
|
|
|
|
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
|
|
|
|
|
boolean reCreateTriggers = false; // 标记是否需要重新创建触发器
|
|
|
|
|
boolean skipV2 = false; // 标记是否需要跳过版本2的升级
|
|
|
|
|
|
|
|
|
|
// 如果旧版本为1，则执行从版本1升级到版本2的操作
|
|
|
|
|
if (oldVersion == 1) {
|
|
|
|
|
upgradeToV2(db); // 执行版本2的升级操作
|
|
|
|
|
skipV2 = true; // 标记跳过版本2的升级
|
|
|
|
|
oldVersion++; // 更新版本号
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 如果旧版本为2且未跳过版本2，则执行从版本2升级到版本3的操作
|
|
|
|
|
if (oldVersion == 2 && !skipV2) {
|
|
|
|
|
upgradeToV3(db); // 执行版本3的升级操作
|
|
|
|
|
reCreateTriggers = true; // 标记需要重新创建触发器
|
|
|
|
|
oldVersion++; // 更新版本号
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 如果旧版本为3，则执行从版本3升级到版本4的操作
|
|
|
|
|
if (oldVersion == 3) {
|
|
|
|
|
upgradeToV4(db); // 执行版本4的升级操作
|
|
|
|
|
oldVersion++; // 更新版本号
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 如果需要重新创建触发器，则重新创建
|
|
|
|
|
if (reCreateTriggers) {
|
|
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
|
|
reCreateDataTableTriggers(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 如果旧版本号与新版本号不一致，则抛出异常
|
|
|
|
|
if (oldVersion != newVersion) {
|
|
|
|
|
throw new IllegalStateException("Upgrade notes database to version " + newVersion + " fails");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 升级到版本2的操作
|
|
|
|
|
private void upgradeToV2(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); // 删除旧的笔记表
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); // 删除旧的数据表
|
|
|
|
|
createNoteTable(db); // 创建新的笔记表
|
|
|
|
|
createDataTable(db); // 创建新的数据表
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 升级到版本3的操作
|
|
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
|
|
// 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");
|
|
|
|
|
|
|
|
|
|
// 在笔记表中添加一个用于Google任务的ID字段
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
|
|
|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
|
|
|
|
|
|
|
|
// 插入一个回收站系统文件夹
|
|
|
|
|
ContentValues values = new ContentValues();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); // 设置笔记ID为回收站文件夹ID
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); // 设置笔记类型为系统类型
|
|
|
|
|
db.insert(TABLE.NOTE, null, values); // 插入数据到笔记表
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 升级到版本4的操作
|
|
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
|
|
// 在笔记表中添加一个用于版本号的字段
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
|
|
}
|
|
|
|
|
}
|
