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@ -14,6 +14,18 @@
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* limitations under the License.
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* limitations under the License.
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*/
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*/
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/**
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*
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* @ProjectName: minode
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* @Package: net.micode.notes.data
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* @ClassName: NotesDatabaseHelper
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* @Description: 该类继承自 SQLiteOpenHelper,用于创建和管理笔记应用的数据库。
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它定义了数据库的名称、版本、表名、创建表和触发器的 SQL 语句,并
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实现了数据库的创建、升级等操作。通过该类,可以方便地进行笔记数据的存储和管理。
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* @Author: 齐景熙
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* @Date: 2024-12-21 22:10
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*/
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package net.micode.notes.data;
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package net.micode.notes.data;
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import android.content.ContentValues;
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import android.content.ContentValues;
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@ -207,10 +219,25 @@ 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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* @method NotesDatabaseHelper
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* @description 构造函数,用于初始化 NotesDatabaseHelper 实例。调用父类的构造函数,传入上下文、
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数据库名称、工厂和数据库版本号,完成数据库帮助者的创建。
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* @date: 2024-12-21 22:10
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* @author: 齐景熙
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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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* @method createNoteTable
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* @description 创建笔记表。执行创建笔记表的 SQL 语句,并调用 reCreateNoteTableTriggers 方法重新
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创建笔记表的触发器,最后创建系统文件夹。
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* @date: 2024-12-21 22:13
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* @author: 齐景熙
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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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@ -218,6 +245,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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Log.d(TAG, "note table has been created");
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Log.d(TAG, "note table has been created");
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}
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}
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/**
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* @method reCreateNoteTableTriggers
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* @description 重新创建笔记表的触发器。先删除已存在的触发器,然后依次创建增加文件夹笔记数量、减少文件
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夹笔记数量、删除笔记数据、移动笔记到回收站等触发器。
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* @date: 2024-12-21 22:15
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* @author: 齐景熙
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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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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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_update");
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@ -236,6 +271,13 @@ 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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* @method createSystemFolder
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* @description 创建系统文件夹。使用 ContentValues 设置系统文件夹的 ID 和类型,然后依次插入通话记录
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文件夹、根文件夹、临时文件夹和回收站文件夹到笔记表中。
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* @date: 2024-12-21 22:20
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* @author: 齐景熙
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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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@ -271,6 +313,12 @@ 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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* @method createDataTable
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* @description 创建数据表。执行创建数据表的 SQL 语句,调用 reCreateDataTableTriggers 方法重新创建数据表的触发器,并创建数据表的索引。
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* @date: 2024-12-21 22:23
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* @author: 齐景熙
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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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@ -278,6 +326,13 @@ 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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* @method reCreateDataTableTriggers
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* @description 重新创建数据表的触发器。先删除已存在的触发器,然后依次创建更新笔记内容的触发器。
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* @date: 2024-12-21 22:25
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* @author: 齐景熙
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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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@ -288,6 +343,12 @@ 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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/**
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* @method getInstance
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* @description 获取 NotesDatabaseHelper 的单例实例。如果实例不存在,则创建一个新的实例;否则,返回已存在的实例。
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* @date: 2024-12-21 22:30
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* @author: 齐景熙
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*/
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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static synchronized NotesDatabaseHelper getInstance(Context context) {
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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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@ -295,12 +356,27 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* @method onCreate
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* @description 数据库创建时的回调方法。调用 createNoteTable 和 createDataTable 方法创建笔记表和数据表。
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* @date: 2024-12-21 22:40
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* @author: 齐景熙
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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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* @method onUpgrade
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* @description 数据库版本升级时的回调方法。根据旧版本号和新版本号,依次调用相应的升级方法
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(如 upgradeToV2、upgradeToV3 等),并在需要时重新创建触发器。如果旧版本号和新版本号不匹配,则抛出异常。
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* @date: 2024-12-21 22:47
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* @author: 齐景熙
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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) {
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boolean reCreateTriggers = false;
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boolean reCreateTriggers = false;
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@ -339,6 +415,13 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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}
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}
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}
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}
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/**
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* @method upgradeToV2
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* @description 升级数据库到版本 2。删除旧的笔记表和数据表,然后重新创建笔记表和数据表。
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* @date: 2024-12-21 22:51
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* @author: 齐景熙
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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);
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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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@ -346,6 +429,13 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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* @method upgradeToV3
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* @description 升级数据库到版本 3。删除不再使用的触发器,为笔记表添加 gtask_id 列,并创建回收站系统文件夹。
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* @date: 2024-12-21 22:55
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* @author: 齐景熙
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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");
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@ -361,11 +451,25 @@ 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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* @method upgradeToV4
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* @description 升级数据库到版本 4。为笔记表添加 version 列。
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* @date: 2024-12-21 22:57
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* @author: 齐景熙
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*/
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private void upgradeToV4(SQLiteDatabase db) {
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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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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
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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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* @method upgradeToV5
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* @description 升级数据库到版本 5。为笔记表添加 top 列。
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* @date: 2024-12-21 23:00
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* @author: 齐景熙
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*/
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private void upgradeToV5(SQLiteDatabase db) {
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private void upgradeToV5(SQLiteDatabase db) {
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.TOP
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.TOP
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+ " INTEGER NOT NULL DEFAULT 0");
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+ " INTEGER NOT NULL DEFAULT 0");
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