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@ -26,22 +26,29 @@ 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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/**
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* 便签应用的数据库帮助类
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* 负责创建和管理数据库表结构，处理数据库版本升级
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*/
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public class NotesDatabaseHelper extends SQLiteOpenHelper {
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// 数据库名称和版本
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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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/**
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* 表名常量
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*/
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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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public static final String NOTE = "note"; // 便签表
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public static final String DATA = "data"; // 数据表
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}
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private static final String TAG = "NotesDatabaseHelper";
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private static NotesDatabaseHelper mInstance;
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/**
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* 创建便签表的SQL语句
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*/
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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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@ -63,6 +70,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
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")";
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/**
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* 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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"CREATE TABLE " + TABLE.DATA + "(" +
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DataColumns.ID + " INTEGER PRIMARY KEY," +
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@ -78,12 +88,15 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
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")";
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/**
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* 创建数据表索引的SQL语句，加速基于note_id的查询
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*/
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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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/**
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* Increase folder's note count when move note to the folder
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* 当便签更新父文件夹时，增加目标文件夹的便签计数
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER increase_folder_count_on_update "+
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@ -95,7 +108,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Decrease folder's note count when move note from folder
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* 当便签更新父文件夹时，减少原文件夹的便签计数
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_update " +
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@ -108,7 +121,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Increase folder's note count when insert new note to the folder
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* 当插入新便签到文件夹时，增加文件夹的便签计数
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*/
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private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER increase_folder_count_on_insert " +
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@ -120,7 +133,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Decrease folder's note count when delete note from the folder
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* 当从文件夹删除便签时，减少文件夹的便签计数
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*/
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private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER decrease_folder_count_on_delete " +
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@ -133,7 +146,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Update note's content when insert data with type {@link DataConstants#NOTE}
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* 当插入文本便签数据时，更新便签的摘要内容
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
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"CREATE TRIGGER update_note_content_on_insert " +
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@ -146,7 +159,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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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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* 当更新文本便签数据时，更新便签的摘要内容
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_update " +
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@ -159,7 +172,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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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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* 当删除文本便签数据时，清空便签的摘要内容
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*/
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private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
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"CREATE TRIGGER update_note_content_on_delete " +
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@ -172,7 +185,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Delete datas belong to note which has been deleted
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* 当删除便签时，级联删除相关的数据项
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*/
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private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
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"CREATE TRIGGER delete_data_on_delete " +
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@ -183,7 +196,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Delete notes belong to folder which has been deleted
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* 当删除文件夹时，级联删除该文件夹下的所有便签
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*/
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private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
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"CREATE TRIGGER folder_delete_notes_on_delete " +
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@ -194,7 +207,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" END";
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/**
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* Move notes belong to folder which has been moved to trash folder
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* 当文件夹被移到回收站时，将该文件夹下的所有便签也移到回收站
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*/
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private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
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"CREATE TRIGGER folder_move_notes_on_trash " +
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@ -206,10 +219,18 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
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" END";
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/**
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* 构造函数
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* @param context 上下文
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*/
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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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/**
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* 创建便签表
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* @param db SQLite数据库实例
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*/
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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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@ -217,7 +238,12 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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Log.d(TAG, "note table has been created");
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}
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/**
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* 重新创建便签表的触发器
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* @param db SQLite数据库实例
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*/
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private void reCreateNoteTableTriggers(SQLiteDatabase db) {
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// 删除旧触发器
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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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@ -226,6 +252,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL("DROP TRIGGER IF EXISTS folder_delete_notes_on_delete");
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db.execSQL("DROP TRIGGER IF EXISTS folder_move_notes_on_trash");
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// 创建新触发器
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db.execSQL(NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER);
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db.execSQL(NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER);
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@ -235,18 +262,22 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
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}
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/**
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* 创建系统文件夹
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* @param db SQLite数据库实例
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*/
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private void createSystemFolder(SQLiteDatabase db) {
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ContentValues values = new ContentValues();
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/**
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* call record foler for call notes
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* 通话记录文件夹，用于存放通话记录便签
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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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/**
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* root folder which is default folder
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* 根文件夹，默认文件夹
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*/
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
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@ -254,7 +285,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.insert(TABLE.NOTE, null, values);
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/**
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* temporary folder which is used for moving note
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* 临时文件夹，用于移动便签操作
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*/
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
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@ -262,7 +293,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.insert(TABLE.NOTE, null, values);
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/**
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* create trash folder
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* 回收站文件夹
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*/
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values.clear();
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values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
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@ -270,6 +301,10 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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db.insert(TABLE.NOTE, null, values);
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}
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/**
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* 创建数据表
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* @param db SQLite数据库实例
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*/
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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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@ -277,16 +312,27 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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Log.d(TAG, "data table has been created");
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}
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/**
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* 重新创建数据表的触发器
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* @param db SQLite数据库实例
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*/
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private void reCreateDataTableTriggers(SQLiteDatabase db) {
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// 删除旧触发器
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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_delete");
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// 创建新触发器
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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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/**
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* 获取数据库帮助类的单例实例
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* @param context 上下文
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* @return 数据库帮助类实例
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*/
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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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@ -294,69 +340,100 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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return mInstance;
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}
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/**
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* 当数据库首次创建时调用
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* @param db SQLite数据库实例
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*/
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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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/**
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* 当数据库需要升级时调用
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* @param db SQLite数据库实例
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* @param oldVersion 旧版本号
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* @param newVersion 新版本号
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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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boolean reCreateTriggers = false;
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boolean skipV2 = false;
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// 从版本1升级到版本2
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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; // 这个升级包含了从v2到v3的升级
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oldVersion++;
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}
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// 从版本2升级到版本3
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if (oldVersion == 2 && !skipV2) {
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upgradeToV3(db);
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reCreateTriggers = true;
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oldVersion++;
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|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 从版本3升级到版本4
|
|
|
|
|
if (oldVersion == 3) {
|
|
|
|
|
upgradeToV4(db);
|
|
|
|
|
oldVersion++;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 重新创建触发器
|
|
|
|
|
if (reCreateTriggers) {
|
|
|
|
|
reCreateNoteTableTriggers(db);
|
|
|
|
|
reCreateDataTableTriggers(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
// 检查升级是否成功
|
|
|
|
|
if (oldVersion != newVersion) {
|
|
|
|
|
throw new IllegalStateException("Upgrade notes database to version " + newVersion
|
|
|
|
|
+ "fails");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 升级到版本2
|
|
|
|
|
* @param db SQLite数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void upgradeToV2(SQLiteDatabase db) {
|
|
|
|
|
// 删除旧表并重新创建
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
|
|
|
|
|
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
|
|
|
|
|
createNoteTable(db);
|
|
|
|
|
createDataTable(db);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 升级到版本3
|
|
|
|
|
* @param db SQLite数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void upgradeToV3(SQLiteDatabase db) {
|
|
|
|
|
// drop unused triggers
|
|
|
|
|
// 删除不再使用的触发器
|
|
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_insert");
|
|
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
|
|
|
|
|
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update");
|
|
|
|
|
// add a column for gtask id
|
|
|
|
|
|
|
|
|
|
// 添加Google任务ID列
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
|
|
|
|
|
+ " TEXT NOT NULL DEFAULT ''");
|
|
|
|
|
// add a trash system folder
|
|
|
|
|
|
|
|
|
|
// 添加回收站系统文件夹
|
|
|
|
|
ContentValues values = new ContentValues();
|
|
|
|
|
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
|
|
|
|
|
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
|
|
|
|
|
db.insert(TABLE.NOTE, null, values);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* 升级到版本4
|
|
|
|
|
* @param db SQLite数据库实例
|
|
|
|
|
*/
|
|
|
|
|
private void upgradeToV4(SQLiteDatabase db) {
|
|
|
|
|
// 添加版本号列，用于同步控制
|
|
|
|
|
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
|
|
|
|
|
+ " INTEGER NOT NULL DEFAULT 0");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
wangyifan
zhaojianxin