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@ -0,0 +1,506 @@
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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;//就是用于保存一些数据（string boolean byte double float int long short ...）信息，这些信息可以被数据库操作时使用。
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import android.content.Context;//加载和访问资源。（android中主要是这两个功能，但是这里具体不清楚）
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import android.database.sqlite.SQLiteDatabase;//主要提供了对应于添加、删除、更新、查询的操作方法： insert()、delete()、update()和query()。配合content.values
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import android.database.sqlite.SQLiteOpenHelper;//用来管理数据的创建和版本更新
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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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* 功能描述：数据库操作，用SQLOpenhelper,对一些note和文件进行数据库的操作
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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private static final String DB_NAME = "note.db";// 数据库名
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private static final int DB_VERSION = 4;// 版本号
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public interface TABLE {
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/*
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* 接口，分成note和data,用于表示数据库中两种表格
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* */
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public static final String NOTE = "note";
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public static final String DATA = "data";
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}
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private static final String TAG = "NotesDatabaseHelper";// 日志标签，用于在日志中标识数据库操作的相关信息
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/*
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* NotesDatabaseHelper 类的实例，用于单例模式的数据库操作，通过 getInstance() 方法获取 NotesDatabaseHelper 的唯一实例
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* 单例模式是一种设计模式，在数据库操作中使用单例模式可以确保只有一个数据库连接，避免了重复创建和关闭数据库连接可能导致的性能问题
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*/
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private static NotesDatabaseHelper mInstance;
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/*
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* 创建TABLE.NOTE表格，用于存储便签的相关信息
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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," +// 便签ID
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +// 便签父级的ID
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +// 便签的提醒日期
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 便签的背景颜色ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 便签的创建日期
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +// 便签是否有附件
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +// 便签的最后修改日期
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +// 文件夹中的便签数量
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +// 文件夹名称或便签的文本内容
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +// 便签的类型
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +// 便签的Widget ID
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +// 便签的Widget类型
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +// 便签的同步ID
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +// 便签的本地修改标记
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +// 原始父级便签的ID
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +// 便签在Google任务中的ID
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +// 便签的版本号
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")";
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/*
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* 创建TABLE.DATA表格，用于存储便签中的数据
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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," +// 数据ID
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DataColumns.MIME_TYPE + " TEXT NOT NULL," +// 数据ID数据的MIME类型
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +// 数据所属的便签的ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +// 数据的创建日期
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +// 数据的最后修改日期
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +// 数据的内容
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DataColumns.DATA1 + " INTEGER," +// 数据的附加信息1
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DataColumns.DATA2 + " INTEGER," +// 数据的附加信息2
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +// 数据的附加信息3
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +// 数据的附加信息4
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +// 数据的附加信息5
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")";
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/*
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* 创建一个名为 note_id_index 的索引，在 TABLE.DATA 表格的 DataColumns.NOTE_ID 列上创建索引，以提高查询性能
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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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* Increase folder's note count when move note to the folder
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*/
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/*
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* 在更新 TABLE.NOTE 表格的 NoteColumns.PARENT_ID 列时，增加相应文件夹的便签计数
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* 通过更新 TABLE.NOTE 表格中的 NoteColumns.NOTES_COUNT 列，将其加1
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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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/**
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* Decrease folder's note count when move note from folder
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*/
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/*
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* 在更新 TABLE.NOTE 表格的 NoteColumns.PARENT_ID 列时，减少相应文件夹的便签计数
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* 通过更新 TABLE.NOTE 表格中的 NoteColumns.NOTES_COUNT 列，将其减1
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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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/**
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* Increase folder's note count when insert new note to the folder
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*/
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/*
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* 在向 TABLE.NOTE 表格插入新便签时，增加相应文件夹的便签计数
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* 通过更新 TABLE.NOTE 表格中的 NoteColumns.NOTES_COUNT 列，将其加1
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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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* Decrease folder's note count when delete note from the folder
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*/
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/*
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* 在从 TABLE.NOTE 表格删除便签时，减少相应文件夹的便签计数
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* 通过更新 TABLE.NOTE 表格中的 NoteColumns.NOTES_COUNT 列，将其减1
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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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/**
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* Update note's content when insert data with type {@link DataConstants#NOTE}
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*/
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/*
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* 在向 TABLE.DATA 表格插入类型为 DataConstants.NOTE 的数据时，更新对应便签的内容
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* 通过更新 TABLE.NOTE 表格中的 NoteColumns.SNIPPET 列，将其设置为新插入数据的内容
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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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/**
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* Update note's content when data with {@link DataConstants#NOTE} type has changed
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*/
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/*
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* 在更新类型为 DataConstants.NOTE 的数据时，更新对应便签的内容
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* 通过触发器在 TABLE.DATA 表格上创建，在数据被更新后将新的内容更新到对应的便签中
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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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/**
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* Update note's content when data with {@link DataConstants#NOTE} type has deleted
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*/
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/*
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* 在删除类型为 DataConstants.NOTE 的数据时，更新对应便签的内容
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* 通过触发器在 TABLE.DATA 表格上创建，在数据被删除后将对应的便签内容清空
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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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/**
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* Delete datas belong to note which has been deleted
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*/
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/*
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* 在删除便签时，同时删除该便签相关的数据
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* 通过触发器在 TABLE.NOTE 表格上创建，在便签被删除后将与该便签相关的数据一并删除
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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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/**
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* Delete notes belong to folder which has been deleted
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*/
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/*
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* 在删除文件夹时，同时删除该文件夹下的所有便签
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* 通过触发器在 TABLE.NOTE 表格上创建，在文件夹被删除后将该文件夹下的所有便签一并删除。
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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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/**
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* Move notes belong to folder which has been moved to trash folder
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*/
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/*
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* 在将文件夹移动到回收站时，同时将该文件夹下的所有便签一并移动到回收站
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* 通过触发器在 TABLE.NOTE 表格上创建，在文件夹被移动到回收站后将该文件夹下的所有便签的父文件夹ID更新为回收站的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 " +
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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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/*
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* 构造函数，传入数据库的名称和版本
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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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* 用于创建存储标签属性的表格
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*/
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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reCreateNoteTableTriggers(db);
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createSystemFolder(db);
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Log.d(TAG, "note table has been created");
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}
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/*
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* 用于重新创建数据库中的触发器
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 通过执行SQL语句DROP TRIGGER IF EXISTS来删除已存在的触发器，以确保不会重复创建
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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
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);// 增加文件夹计数的触发器
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);// 减少文件夹计数的触发器
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);// 删除文件夹计数的触发器
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db.execSQL(NOTE_DELETE_DATA_ON_DELETE_TRIGGER);// 在删除时同时删除数据的触发器
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER);// 增加文件夹计数的触发器
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db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);// 在删除时同时删除文件夹中的笔记的触发器
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);// 将笔记移动到垃圾箱的触发器
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}
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|
/*
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|
*用于创建系统文件夹，插入四个不同类型的文件夹记录到 NoteColumns 表中
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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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|
|
/**
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|
|
* call record foler for call notes
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|
*/
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|
|
/*
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|
* 创建通话记录文件夹
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|
|
*/
|
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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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|
|
/**
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|
* root folder which is default folder
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|
|
*/
|
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|
|
/*
|
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|
|
* 根目录，即默认文件夹
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|
|
|
*/
|
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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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|
|
/**
|
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|
|
* temporary folder which is used for moving note
|
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|
|
*/
|
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|
|
|
/*
|
|
|
|
|
* 临时目录，用于移动笔记
|
|
|
|
|
*/
|
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|
|
|
values.clear();
|
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|
|
|
values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
|
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|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
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|
|
db.insert(TABLE.NOTE, null, values);
|
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|
|
/**
|
|
|
|
|
* create trash folder
|
|
|
|
|
*/
|
|
|
|
|
/*
|
|
|
|
|
* 创建垃圾箱
|
|
|
|
|
*/
|
|
|
|
|
values.clear();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 用于创建存储标签内容的表格
|
|
|
|
|
*/
|
|
|
|
|
public void createDataTable(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL(CREATE_DATA_TABLE_SQL);// 执行 CREATE_DATA_TABLE_SQL 的 SQL 语句来创建数据表
|
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|
|
|
reCreateDataTableTriggers(db);// 调用 reCreateDataTableTriggers() 方法重新创建数据表中的触发器
|
|
|
|
|
db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);// 执行 CREATE_DATA_NOTE_ID_INDEX_SQL 的 SQL 语句来创建一个索引
|
|
|
|
|
Log.d(TAG, "data table has been created");
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 用于重新创建数据表中的触发器
|
|
|
|
|
*/
|
|
|
|
|
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");
|
|
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_delete");
|
|
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 用于获取单例的数据库帮助类对象
|
|
|
|
|
* 解决同一时刻只能有一个线程执行.
|
|
|
|
|
* 在写程序库代码时，有时有一个类需要被所的其它类使用
|
|
|
|
|
* 但又要求这个类只能被实例化一次，是个服务类，定义一次，其它类使用同一个这个类的实例
|
|
|
|
|
*/
|
|
|
|
|
static synchronized NotesDatabaseHelper getInstance(Context context) {
|
|
|
|
|
if (mInstance == null) {
|
|
|
|
|
mInstance = new NotesDatabaseHelper(context);
|
|
|
|
|
}
|
|
|
|
|
return mInstance;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
|
/*
|
|
|
|
|
* 在数据库第一次创建时被调用，用于创建所需的表格和触发器
|
|
|
|
|
*/
|
|
|
|
|
public void onCreate(SQLiteDatabase db) {
|
|
|
|
|
createNoteTable(db);
|
|
|
|
|
createDataTable(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
@Override
|
|
|
|
|
/*
|
|
|
|
|
* 根据旧版本和新版本之间的差异来执行相应的数据库升级操作
|
|
|
|
|
*/
|
|
|
|
|
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
|
|
|
|
|
boolean reCreateTriggers = false;
|
|
|
|
|
boolean skipV2 = false;// 是否进行V2升级
|
|
|
|
|
/*
|
|
|
|
|
* 如果旧版本为1，则调用upgradeToV2方法
|
|
|
|
|
*/
|
|
|
|
|
if (oldVersion == 1) {
|
|
|
|
|
upgradeToV2(db);
|
|
|
|
|
skipV2 = true; // this upgrade including the upgrade from v2 to v3
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* 如果旧版本为2且未跳过V2升级，则调用upgradeToV3方法
|
|
|
|
|
*/
|
|
|
|
|
if (oldVersion == 2 && !skipV2) {
|
|
|
|
|
upgradeToV3(db);
|
|
|
|
|
reCreateTriggers = true;
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* 如果旧版本为3，则调用upgradeToV4方法
|
|
|
|
|
*/
|
|
|
|
|
if (oldVersion == 3) {
|
|
|
|
|
upgradeToV4(db);
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* 如果需要重新创建触发器，则调用reCreateNoteTableTriggers和reCreateDataTableTriggers方法重新创建触发器
|
|
|
|
|
*/
|
|
|
|
|
if (reCreateTriggers) {
|
|
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
|
|
reCreateDataTableTriggers(db);
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* 如果旧版本和新版本不匹配，则抛出异常
|
|
|
|
|
*/
|
|
|
|
|
if (oldVersion != newVersion) {
|
|
|
|
|
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
|
|
|
|
+ "fails");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 更新到V2版本
|
|
|
|
|
* */
|
|
|
|
|
private void upgradeToV2(SQLiteDatabase db) {
|
|
|
|
|
/*
|
|
|
|
|
* 通过执行SQL语句DROP TABLE IF EXISTS来删除旧的NOTE和DATA表格
|
|
|
|
|
* */
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
|
|
|
|
|
createNoteTable(db);// 调用createNoteTable和createDataTable方法来创建新的NOTE表格
|
|
|
|
|
createDataTable(db);// 调用createNoteTable和createDataTable方法来创建新的DATA表格
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 更新到V3版本
|
|
|
|
|
* */
|
|
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
|
|
/*
|
|
|
|
|
* 执行SQL语句DROP TRIGGER IF EXISTS来移除不再使用的触发器
|
|
|
|
|
* */
|
|
|
|
|
// drop unused triggers
|
|
|
|
|
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");
|
|
|
|
|
/*
|
|
|
|
|
* 执行ALTER TABLE语句向NOTE表格中添加一个新的列GTASK_ID，该列的类型是TEXT，并设置默认值为''
|
|
|
|
|
* */
|
|
|
|
|
// add a column for gtask id
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
|
|
|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
|
|
|
/*
|
|
|
|
|
* 通过ContentValues对象向NOTE表格中插入一条记录，该记录代表垃圾箱系统文件夹
|
|
|
|
|
* */
|
|
|
|
|
// add a trash system folder
|
|
|
|
|
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);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* 更新到V4版本
|
|
|
|
|
* */
|
|
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");// 通过执行ALTER TABLE语句向NOTE表格中添加一个新的列VERSION，该列的类型是INTEGER，并设置默认值为0
|
|
|
|
|
}
|
|
|
|
|
}
|
