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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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/**
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* NotesDatabaseHelper类用于管理便签应用的数据库创建和版本升级。
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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"; // 数据库名称
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private static final int DB_VERSION = 4; // 数据库版本
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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"; // 数据表
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}
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private static final String TAG = "NotesDatabaseHelper"; // 日志标签
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private static NotesDatabaseHelper mInstance; // 单例实例
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/**
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* 创建便签表的SQL语句
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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," + // 父ID
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒日期
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 便签数量
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 便签摘要
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 便签类型
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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," + // 本地修改标志
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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任务ID
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号
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")";
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/**
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* 创建数据表的SQL语句
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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," + // MIME类型
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 便签ID
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建日期
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改日期
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + // 数据内容
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DataColumns.DATA1 + " INTEGER," + // 数据1
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DataColumns.DATA2 + " INTEGER," + // 数据2
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 数据3
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 数据4
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 数据5
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")";
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/**
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* 创建数据表便签ID索引的SQL语句
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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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// 定义触发器SQL语句...
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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
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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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* 重新创建便签表触发器
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除旧触发器...
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// 创建新触发器...
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}
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/**
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* 创建系统文件夹
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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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// 插入系统文件夹...
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}
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/**
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* 创建数据表
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*/
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public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL);
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reCreateDataTableTriggers(db);
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db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
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Log.d(TAG, "data table has been created");
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}
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/**
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* 重新创建数据表触发器
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*/
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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// 删除旧触发器...
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// 创建新触发器...
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}
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/**
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* 获取单例实例
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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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@Override
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public void onCreate(SQLiteDatabase db) {
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createNoteTable(db);
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createDataTable(db);
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}
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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// 升级数据库版本...
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}
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// 升级方法...
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}
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