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@ -1,38 +1,22 @@
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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.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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//数据库操作，用SQLOpenhelper,对一些note和文件进行数据库的操作，比如删除文件后，将文件里的note也相应删除
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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private static final String DB_NAME = "note.db";
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private static final int DB_VERSION = 4;
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public interface TABLE {
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public interface TABLE { //接口，分成note和data，在后面的程序里分别使用过
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public static final String NOTE = "note";
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public static final String DATA = "data";
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@ -61,7 +45,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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")";
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")";//数据库中需要存储的项目的名称，就相当于创建一个表格的表头的内容。
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private static final String CREATE_DATA_TABLE_SQL =
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"CREATE TABLE " + TABLE.DATA + "(" +
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@ -76,11 +60,11 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";
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")";//和上面的功能一样，主要是存储的项目不同
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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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TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";//存储便签编号的一个数据表格
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/**
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* Increase folder's note count when move note to the folder
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@ -92,7 +76,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//在文件夹中移入一个Note之后需要更改的数据的表格。
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/**
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* Decrease folder's note count when move note from folder
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@ -105,7 +89,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//在文件夹中移出一个Note之后需要更改的数据的表格。
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/**
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* Increase folder's note count when insert new note to the folder
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@ -117,7 +101,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//在文件夹中插入一个Note之后需要更改的数据的表格。
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/**
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* Decrease folder's note count when delete note from the folder
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@ -130,7 +114,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//在文件夹中删除一个Note之后需要更改的数据的表格。
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/**
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* Update note's content when insert data with type {@link DataConstants#NOTE}
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@ -143,7 +127,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//在文件夹中对一个Note导入新的数据之后需要更改的数据的表格。
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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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@ -156,7 +140,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//Note数据被修改后需要更改的数据的表格。
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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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@ -169,7 +153,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//Note数据被删除后需要更改的数据的表格。
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/**
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* Delete datas belong to note which has been deleted
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@ -180,7 +164,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//删除已删除的便签的数据后需要更改的数据的表格。
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/**
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* Delete notes belong to folder which has been deleted
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@ -191,7 +175,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//删除已删除的文件夹的便签后需要更改的数据的表格。
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/**
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* Move notes belong to folder which has been moved to trash folder
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@ -204,18 +188,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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" END";//还原垃圾桶中便签后需要更改的数据的表格。
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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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}//构造函数，传入数据库的名称和版本
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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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}//创建表格（用来存储标签属性）
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
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@ -233,7 +217,8 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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}//execSQL是数据库操作的API，主要是更改行为的SQL语句。
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//在这里主要是用来重新创建上述定义的表格用的，先删除原来有的数据库的触发器再重新创建新的数据库
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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@ -268,14 +253,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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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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}//创建几个系统文件夹
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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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}//创建表格（用来存储标签内容）
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
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@ -285,20 +270,22 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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}
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}//同上面的execSQL
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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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}//上网查是为解决同一时刻只能有一个线程执行.
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//在写程序库代码时，有时有一个类需要被所有的其它类使用，
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//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
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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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}//实现两个表格（上面创建的两个表格）
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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@ -331,14 +318,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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throw new IllegalStateException("Upgrade notes database to version " + newVersion
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+ "fails");
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}
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}
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}//数据库版本的更新（数据库内容的更改）
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private void upgradeToV2(SQLiteDatabase db) {
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
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createNoteTable(db);
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createDataTable(db);
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}
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}//更新到V2版本
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private void upgradeToV3(SQLiteDatabase db) {
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// drop unused triggers
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@ -353,10 +340,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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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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}//更新到V3版本
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private void upgradeToV4(SQLiteDatabase db) {
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
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+ " INTEGER NOT NULL DEFAULT 0");
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}
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}//更新到V4版本,但是不知道V2、V3、V4是什么意思
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}
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