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@ -27,50 +27,57 @@ import net.micode.notes.data.Notes.DataConstants;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.data.Notes.NoteColumns;
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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public class NotesDatabaseHelper extends SQLiteOpenHelper { //类的继承，前是后的子集
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private static final String DB_NAME = "note.db";
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private static final String DB_NAME = "note.db"; //私有变量
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private static final int DB_VERSION = 4;
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private static final int DB_VERSION = 4; //数据库版本号
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public interface TABLE {
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public interface TABLE { //内部接口table
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public static final String NOTE = "note";
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public static final String NOTE = "note"; //笔记本的名字叫note
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public static final String DATA = "data";
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public static final String DATA = "data"; //数据表的名字叫data
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}
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}
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private static final String TAG = "NotesDatabaseHelper";
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private static final String TAG = "NotesDatabaseHelper"; //日志标签，用于在日志中标记该类的信息
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private static NotesDatabaseHelper mInstance;
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private static NotesDatabaseHelper mInstance; //mInstance会在NotesDatabaseHelper类中作为单例模式的实现，以确保在应用程序中只有一个NotesDatabaseHelper类的实例被创建并被全局范围内所使用。
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/**
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* 创建两个数据库表，分别存储笔记和与笔记相关的数据，以及相应的索引。
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*/
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private static final String CREATE_NOTE_TABLE_SQL =
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private static final String CREATE_NOTE_TABLE_SQL =
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"CREATE TABLE " + TABLE.NOTE + "(" +
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"CREATE TABLE " + TABLE.NOTE + "(" +
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NoteColumns.ID + " INTEGER PRIMARY KEY," +
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NoteColumns.ID + " INTEGER PRIMARY KEY," + //主键（保证表中的每一行都有唯一性）
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + //父级的id
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + //用于标识的标识符
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + //背景颜色
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + //笔记的创建时间
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + //表示是否包含部件
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + //笔记的修改时间
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + //子笔记的数量
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + //笔记的摘要或片段内容
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + //类型
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + //关联的小部件的id
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
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NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + //小部件的类型
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + //用于同步的id，与远程同步服务有关
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + //笔记是否在本地被修改
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + //原始父级的id
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
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NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + //google任务服务的id
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + //笔记的版本号
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")";
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")";
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/**
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* 创建数据表的SQL语句创建数据表的SQL语句
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*/
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private static final String CREATE_DATA_TABLE_SQL =
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private static final String CREATE_DATA_TABLE_SQL =
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"CREATE TABLE " + TABLE.DATA + "(" +
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"CREATE TABLE " + TABLE.DATA + "(" +
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DataColumns.ID + " INTEGER PRIMARY KEY," +
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DataColumns.ID + " INTEGER PRIMARY KEY," + //DataColumns.ID表示一个名为"ID"的列，数据类型为INTEGER(整数)，并且被定义为主键。
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DataColumns.MIME_TYPE + " TEXT NOT NULL," +
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DataColumns.MIME_TYPE + " TEXT NOT NULL," + //版本
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
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DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + //笔记的名称
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + //创建时间
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
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NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + //上一次修改时间
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.CONTENT + " TEXT NOT NULL DEFAULT ''," + //摘要
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DataColumns.DATA1 + " INTEGER," +
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DataColumns.DATA1 + " INTEGER," +
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DataColumns.DATA2 + " INTEGER," +
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DataColumns.DATA2 + " INTEGER," +
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
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@ -206,10 +213,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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" END";
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/**
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* 接受cotext参数（包含了应用程序的运行环境信息），用于创建和打开数据库
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* @param context
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*/
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public NotesDatabaseHelper(Context context) {
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public NotesDatabaseHelper(Context context) {
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super(context, DB_NAME, null, DB_VERSION);
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super(context, DB_NAME, null, DB_VERSION);
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}
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}
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/**
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* （创建名为note的表，并且为该表重新创建触发器和创建系统文件夹。）
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* @param db
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*/
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public void createNoteTable(SQLiteDatabase db) {
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public void createNoteTable(SQLiteDatabase db) {
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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db.execSQL(CREATE_NOTE_TABLE_SQL);
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reCreateNoteTableTriggers(db);
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reCreateNoteTableTriggers(db);
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@ -235,6 +250,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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}
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/**
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* 在数据库中创建系统级别的文件夹。
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* @param db
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*/
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private void createSystemFolder(SQLiteDatabase db) {
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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ContentValues values = new ContentValues();
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@ -270,6 +289,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.insert(TABLE.NOTE, null, values);
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db.insert(TABLE.NOTE, null, values);
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}
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}
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/**
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* 用于创建数据表，其中包括执行创建表的SQL语句、重新创建触发器以及创建索引，并在完成之后记录日志。
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* @param db
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*/
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public void createDataTable(SQLiteDatabase db) {
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public void createDataTable(SQLiteDatabase db) {
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db.execSQL(CREATE_DATA_TABLE_SQL);
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db.execSQL(CREATE_DATA_TABLE_SQL);
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reCreateDataTableTriggers(db);
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reCreateDataTableTriggers(db);
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@ -277,6 +300,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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Log.d(TAG, "data table has been created");
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Log.d(TAG, "data table has been created");
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}
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}
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/**
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* 用于重新创建数据表的触发器。首先，它会删除已存在的触发器，然后再重新创建触发器。
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* @param db
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*/
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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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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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_update");
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@ -287,37 +314,47 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
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}
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}
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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static synchronized NotesDatabaseHelper getInstance(Context context) { //static synchronized 是Java中的修饰符，用于同时指定一个方法或代码块为静态和同步。
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if (mInstance == null) {
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if (mInstance == null) {
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mInstance = new NotesDatabaseHelper(context);
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mInstance = new NotesDatabaseHelper(context);
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}
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}
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return mInstance;
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return mInstance;
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}
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}
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/**
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* 系统的首次创建
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* @param db
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*/
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@Override
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@Override
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public void onCreate(SQLiteDatabase db) {
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public void onCreate(SQLiteDatabase db) {
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createNoteTable(db);
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createNoteTable(db);
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createDataTable(db);
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createDataTable(db);
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}
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}
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/**
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* 数据库升级
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* @param db
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* @param oldVersion
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* @param newVersion
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*/
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@Override
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { //db是要升级的数据库对象，oldVersion是当前数据库版本号，newVersion是要升级到的新版本号。
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boolean reCreateTriggers = false;
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boolean reCreateTriggers = false; //是否重新创建触发器和是否跳过V2版本的升级。
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boolean skipV2 = false;
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boolean skipV2 = false;
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if (oldVersion == 1) {
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if (oldVersion == 1) { //执行升级到V2版本的操作。
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upgradeToV2(db);
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upgradeToV2(db);
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skipV2 = true; // this upgrade including the upgrade from v2 to v3
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skipV2 = true; // this upgrade including the upgrade from v2 to v3
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oldVersion++;
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oldVersion++;
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}
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}
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if (oldVersion == 2 && !skipV2) {
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if (oldVersion == 2 && !skipV2) { //执行升级到V3版本的操作。
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upgradeToV3(db);
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upgradeToV3(db);
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reCreateTriggers = true;
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reCreateTriggers = true;
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oldVersion++;
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oldVersion++;
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}
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}
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if (oldVersion == 3) {
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if (oldVersion == 3) { //执行升级到V4版本的操作。
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upgradeToV4(db);
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upgradeToV4(db);
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oldVersion++;
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oldVersion++;
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}
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}
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@ -327,36 +364,36 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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reCreateDataTableTriggers(db);
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reCreateDataTableTriggers(db);
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}
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}
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if (oldVersion != newVersion) {
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if (oldVersion != newVersion) { //判断升级后的数据库版本号是否与目标版本号相等。如果不相等，则抛出一个异常。
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throw new IllegalStateException("Upgrade notes database to version " + newVersion
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throw new IllegalStateException("Upgrade notes database to version " + newVersion
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+ "fails");
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+ "fails");
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}
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}
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}
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}
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private void upgradeToV2(SQLiteDatabase db) {
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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.NOTE); //删除名为Note和Data的表。
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
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db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
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createNoteTable(db);
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createNoteTable(db); //创建新的表
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createDataTable(db);
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createDataTable(db);
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}
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}
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private void upgradeToV3(SQLiteDatabase db) {
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private void upgradeToV3(SQLiteDatabase db) {
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// drop unused triggers
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// drop unused triggers
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert"); //删除三个触发器
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
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db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
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// add a column for gtask id
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// add a column for gtask id
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID //向Note表中添加一个名为gtask_id的列。该列的数据类型为TEXT，非空，并设置默认值为空字符串。
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+ " TEXT NOT NULL DEFAULT ''");
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+ " TEXT NOT NULL DEFAULT ''");
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// add a trash system folder
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// add a trash system folder
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ContentValues values = new ContentValues();
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ContentValues values = new ContentValues(); //创建一个ContentValues对象，用于存储待插入到数据库的键值对。
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); //系统级别的文件夹，用于存放已经删除的笔记。
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
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values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); //表示向Note表中插入的记录类型为Notes.TYPE_SYSTEM，即系统级别的记录
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db.insert(TABLE.NOTE, null, values);
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db.insert(TABLE.NOTE, null, values);
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}
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}
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private void upgradeToV4(SQLiteDatabase db) {
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|
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private void upgradeToV4(SQLiteDatabase db) {
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|
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION //向Note表中添加一个名为version的列。该列的数据类型为INTEGER
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|
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+ " INTEGER NOT NULL DEFAULT 0");
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+ " INTEGER NOT NULL DEFAULT 0");
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}
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}
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|
|
}
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}
|
