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@ -27,7 +27,7 @@ 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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public class NotesDatabaseHelper extends SQLiteOpenHelper { //定义数据库相关的名称以及标签
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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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@ -42,7 +42,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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private static NotesDatabaseHelper mInstance;
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private static final String CREATE_NOTE_TABLE_SQL =
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private static final String CREATE_NOTE_TABLE_SQL =//规范定义数据库存储信息的格式以及组成部分
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"CREATE TABLE " + TABLE.NOTE + "(" +
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NoteColumns.ID + " INTEGER PRIMARY KEY," +
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NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
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@ -85,7 +85,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =//设置触发器,在笔记集更新的时候增加数量1
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"CREATE TRIGGER increase_folder_count_on_update "+
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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@ -97,7 +97,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =//类似的设置触发器,在笔记集更新的时候减少数量1
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"CREATE TRIGGER decrease_folder_count_on_update " +
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" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
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" BEGIN " +
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@ -110,7 +110,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =//设置触发器,在笔记集创建的时候增加数量1
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"CREATE TRIGGER increase_folder_count_on_insert " +
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" AFTER INSERT ON " + TABLE.NOTE +
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" BEGIN " +
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@ -122,7 +122,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =//设置触发器,在笔记集删除文件的时候-1
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"CREATE TRIGGER decrease_folder_count_on_delete " +
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" AFTER DELETE ON " + TABLE.NOTE +
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" BEGIN " +
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@ -135,7 +135,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =//设置触发器用于在笔记中数据更改时进行相应ID,字段等的更新
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"CREATE TRIGGER update_note_content_on_insert " +
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" AFTER INSERT ON " + TABLE.DATA +
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" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
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@ -210,14 +210,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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super(context, DB_NAME, null, DB_VERSION);
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}
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public void createNoteTable(SQLiteDatabase db) {
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public void createNoteTable(SQLiteDatabase db) {//创建并管理日志信息表
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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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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {//重置触发器
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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_delete");
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@ -301,7 +301,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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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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public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {//用于检查并进行数据库版本的更新,保障版本控制
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boolean reCreateTriggers = false;
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boolean skipV2 = false;
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