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@ -21,27 +21,28 @@ 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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// 该类继承自 SQLiteOpenHelper,用于管理笔记应用的数据库创建、升级和相关操作
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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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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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// 数据库名称
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private static final String DB_NAME = "note.db";
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// 数据库版本号
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private static final int DB_VERSION = 4;
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// 定义数据库表名的接口
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public interface TABLE {
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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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// 日志标签,用于在数据库操作过程中记录日志信息
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private static final String TAG = "NotesDatabaseHelper";
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// 单例模式实例
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private static NotesDatabaseHelper mInstance;
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// 创建笔记表的 SQL 语句
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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," +
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@ -62,7 +63,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 创建数据表的 SQL 语句
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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," +
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@ -77,11 +78,11 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 在数据表上创建基于 note_id 的索引 SQL 语句,如果不存在则创建
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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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// 当笔记移动到文件夹时增加文件夹笔记数量的触发器 SQL 语句
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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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@ -93,7 +94,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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// 当笔记从文件夹移出时减少文件夹笔记数量的触发器 SQL 语句
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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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@ -106,7 +107,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当在文件夹中插入新笔记时增加文件夹笔记数量的触发器 SQL 语句
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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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@ -118,7 +119,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
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" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
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" END";
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// 当从文件夹中删除笔记时减少文件夹笔记数量的触发器 SQL 语句
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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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@ -131,7 +132,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当插入类型为笔记的数据时更新笔记内容的触发器 SQL 语句
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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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@ -144,7 +145,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当笔记类型的数据更新时更新笔记内容的触发器 SQL 语句
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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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@ -157,7 +158,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当笔记类型的数据删除时更新笔记内容的触发器 SQL 语句
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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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@ -170,7 +171,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当笔记被删除时删除其关联数据的触发器 SQL 语句
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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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@ -181,7 +182,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当文件夹被删除时删除其关联笔记的触发器 SQL 语句
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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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@ -192,7 +193,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 当文件夹被移动到垃圾桶文件夹时移动其关联笔记的触发器 SQL 语句
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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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@ -205,18 +206,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 构造函数,调用父类 SQLiteOpenHelper 的构造函数,传入上下文、数据库名称、游标工厂(这里为 null)和版本号
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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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// 创建笔记表的方法,执行创建表的 SQL 语句,重新创建触发器,并创建系统文件夹
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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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// 重新创建笔记表触发器的方法,先删除已存在的相关触发器,再创建新的触发器
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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 decrease_folder_count_on_update");
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@ -234,17 +235,17 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 创建系统文件夹的方法,向笔记表中插入通话记录文件夹、根文件夹、临时文件夹和垃圾桶文件夹的记录
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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// 通话记录文件夹
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/**
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* call record foler for call notes
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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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// 根文件夹
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/**
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* root folder which is default folder
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*/
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@ -252,7 +253,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 临时文件夹
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/**
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* temporary folder which is used for moving note
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*/
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@ -260,7 +261,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 垃圾桶文件夹
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/**
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* create trash folder
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*/
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@ -269,14 +270,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 创建数据表的方法,执行创建表的 SQL 语句,重新创建触发器,并创建索引
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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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// 重新创建数据表触发器的方法,先删除已存在的相关触发器,再创建新的触发器
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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_update");
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@ -286,20 +287,20 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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// 单例模式获取实例的方法,确保只有一个 NotesDatabaseHelper 实例存在
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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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// 重写 onCreate 方法,在数据库首次创建时调用,创建笔记表和数据表
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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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// 重写 onUpgrade 方法,在数据库版本升级时调用,根据不同的旧版本执行相应的升级操作
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@Override
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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
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boolean reCreateTriggers = false;
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@ -307,7 +308,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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if (oldVersion == 1) {
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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; // 此次升级包含从 v2 到 v3 的升级
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oldVersion++;
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}
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@ -332,29 +333,29 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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+ "fails");
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}
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}
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// 从版本 1 升级到版本 2 的方法,删除旧表并重新创建新表
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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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// 从版本 2 升级到版本 3 的方法,删除无用触发器,添加 gtask_id 列,并添加垃圾桶系统文件夹
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private void upgradeToV3(SQLiteDatabase db) {
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// drop unused triggers
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// 删除无用触发器
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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_delete");
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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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// 添加 gtask_id 列
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db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
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+ " TEXT NOT NULL DEFAULT ''");
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// add a trash system folder
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// 添加垃圾桶系统文件夹
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ContentValues values = new ContentValues();
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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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// 从版本 3 升级到版本 4 的方法,添加 version 列
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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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