@ -26,65 +26,66 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.DataConstants ;
import net.micode.notes.data.Notes.NoteColumns ;
// 数据库帮助类,用于创建和管理小米便签的数据库
public class NotesDatabaseHelper extends SQLiteOpenHelper {
// 数据库名称
private static final String DB_NAME = "note.db" ;
// 数据库版本号
private static final int DB_VERSION = 4 ;
// 表名常量接口
public interface TABLE {
public static final String NOTE = "note" ;
public static final String DATA = "data" ;
public static final String NOTE = "note" ; // 便签主表
public static final String DATA = "data" ; // 便签数据表
}
private static final String TAG = "NotesDatabaseHelper" ;
private static NotesDatabaseHelper mInstance ;
private static final String TAG = "NotesDatabaseHelper" ; // 日志标签
private static NotesDatabaseHelper mInstance ; // 单例实例
// 创建便签表的SQL语句
private static final String CREATE_NOTE_TABLE_SQL =
"CREATE TABLE " + TABLE . NOTE + "(" +
NoteColumns . ID + " INTEGER PRIMARY KEY," +
NoteColumns . PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns . HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns . NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . SNIPPET + " TEXT NOT NULL DEFAULT ''," +
NoteColumns . TYPE + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
NoteColumns . SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
NoteColumns . VERSION + " INTEGER NOT NULL DEFAULT 0" +
NoteColumns . ID + " INTEGER PRIMARY KEY," + // 主键ID
NoteColumns . PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父文件夹ID
NoteColumns . ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + // 提醒日期
NoteColumns . BG_COLOR_ID + " INTEGER NOT NULL DEFAULT 0," + // 背景颜色ID
NoteColumns . CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建时间
NoteColumns . HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + // 是否有附件
NoteColumns . MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改时间
NoteColumns . NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + // 子便签数量
NoteColumns . SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 便签摘要
NoteColumns . TYPE + " INTEGER NOT NULL DEFAULT 0," + // 便签类型
NoteColumns . WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + // 小部件ID
NoteColumns . WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + // 小部件类型
NoteColumns . SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + // 同步ID
NoteColumns . LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + // 本地修改标志
NoteColumns . ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父文件夹ID
NoteColumns . GTASK_ID + " TEXT NOT NULL DEFAULT ''," + // Google任务ID
NoteColumns . VERSION + " INTEGER NOT NULL DEFAULT 0" + // 版本号
")" ;
// 创建数据表的SQL语句
private static final String CREATE_DATA_TABLE_SQL =
"CREATE TABLE " + TABLE . DATA + "(" +
DataColumns . ID + " INTEGER PRIMARY KEY," +
DataColumns . MIME_TYPE + " TEXT NOT NULL," +
DataColumns . NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns . CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns . MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
DataColumns . CONTENT + " TEXT NOT NULL DEFAULT ''," +
DataColumns . DATA1 + " INTEGER," +
DataColumns . DATA2 + " INTEGER," +
DataColumns . DATA3 + " TEXT NOT NULL DEFAULT ''," +
DataColumns . DATA4 + " TEXT NOT NULL DEFAULT ''," +
DataColumns . DATA5 + " TEXT NOT NULL DEFAULT ''" +
DataColumns . ID + " INTEGER PRIMARY KEY," + // 主键ID
DataColumns . MIME_TYPE + " TEXT NOT NULL," + // MIME类型
DataColumns . NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的便签ID
NoteColumns . CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 创建时间
NoteColumns . MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + // 修改时间
DataColumns . CONTENT + " TEXT NOT NULL DEFAULT ''," + // 内容
DataColumns . DATA1 + " INTEGER," + // 备用数据1
DataColumns . DATA2 + " INTEGER," + // 备用数据2
DataColumns . DATA3 + " TEXT NOT NULL DEFAULT ''," + // 备用数据3
DataColumns . DATA4 + " TEXT NOT NULL DEFAULT ''," + // 备用数据4
DataColumns . DATA5 + " TEXT NOT NULL DEFAULT ''" + // 备用数据5
")" ;
// 为DATA表的NOTE_ID字段创建索引
private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
"CREATE INDEX IF NOT EXISTS note_id_index ON " +
TABLE . DATA + "(" + DataColumns . NOTE_ID + ");" ;
/ * *
* Increase folder ' s note count when move note to the folder
* /
// 触发器:更新文件夹的便签数量(当便签移动到文件夹时增加计数)
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER increase_folder_count_on_update " +
" AFTER UPDATE OF " + NoteColumns . PARENT_ID + " ON " + TABLE . NOTE +
@ -94,9 +95,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . ID + "=new." + NoteColumns . PARENT_ID + ";" +
" END" ;
/ * *
* Decrease folder ' s note count when move note from folder
* /
// 触发器:更新文件夹的便签数量(当便签从文件夹移出时减少计数)
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER decrease_folder_count_on_update " +
" AFTER UPDATE OF " + NoteColumns . PARENT_ID + " ON " + TABLE . NOTE +
@ -107,9 +106,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" AND " + NoteColumns . NOTES_COUNT + ">0" + ";" +
" END" ;
/ * *
* Increase folder ' s note count when insert new note to the folder
* /
// 触发器:增加文件夹的便签数量(当插入新便签到文件夹时)
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
"CREATE TRIGGER increase_folder_count_on_insert " +
" AFTER INSERT ON " + TABLE . NOTE +
@ -119,9 +116,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . ID + "=new." + NoteColumns . PARENT_ID + ";" +
" END" ;
/ * *
* Decrease folder ' s note count when delete note from the folder
* /
// 触发器:减少文件夹的便签数量(当从文件夹删除便签时)
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
"CREATE TRIGGER decrease_folder_count_on_delete " +
" AFTER DELETE ON " + TABLE . NOTE +
@ -132,9 +127,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" AND " + NoteColumns . NOTES_COUNT + ">0;" +
" END" ;
/ * *
* Update note ' s content when insert data with type { @link DataConstants # NOTE }
* /
// 触发器: 当插入NOTE类型的数据时更新便签内容
private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
"CREATE TRIGGER update_note_content_on_insert " +
" AFTER INSERT ON " + TABLE . DATA +
@ -145,9 +138,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . ID + "=new." + DataColumns . NOTE_ID + ";" +
" END" ;
/ * *
* Update note ' s content when data with { @link DataConstants # NOTE } type has changed
* /
// 触发器: 当更新NOTE类型的数据时更新便签内容
private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER update_note_content_on_update " +
" AFTER UPDATE ON " + TABLE . DATA +
@ -158,9 +149,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . ID + "=new." + DataColumns . NOTE_ID + ";" +
" END" ;
/ * *
* Update note ' s content when data with { @link DataConstants # NOTE } type has deleted
* /
// 触发器: 当删除NOTE类型的数据时清空便签内容
private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
"CREATE TRIGGER update_note_content_on_delete " +
" AFTER delete ON " + TABLE . DATA +
@ -171,9 +160,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . ID + "=old." + DataColumns . NOTE_ID + ";" +
" END" ;
/ * *
* Delete datas belong to note which has been deleted
* /
// 触发器:当删除便签时删除关联的数据
private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
"CREATE TRIGGER delete_data_on_delete " +
" AFTER DELETE ON " + TABLE . NOTE +
@ -182,9 +169,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + DataColumns . NOTE_ID + "=old." + NoteColumns . ID + ";" +
" END" ;
/ * *
* Delete notes belong to folder which has been deleted
* /
// 触发器:当删除文件夹时删除其中的所有便签
private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
"CREATE TRIGGER folder_delete_notes_on_delete " +
" AFTER DELETE ON " + TABLE . NOTE +
@ -193,9 +178,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . PARENT_ID + "=old." + NoteColumns . ID + ";" +
" END" ;
/ * *
* Move notes belong to folder which has been moved to trash folder
* /
// 触发器:当移动文件夹到回收站时,移动其中的所有便签到回收站
private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
"CREATE TRIGGER folder_move_notes_on_trash " +
" AFTER UPDATE ON " + TABLE . NOTE +
@ -206,18 +189,22 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
" WHERE " + NoteColumns . PARENT_ID + "=old." + NoteColumns . ID + ";" +
" END" ;
// 构造函数
public NotesDatabaseHelper ( Context context ) {
super ( context , DB_NAME , null , DB_VERSION ) ;
}
// 创建便签表
public void createNoteTable ( SQLiteDatabase db ) {
db . execSQL ( CREATE_NOTE_TABLE_SQL ) ;
reCreateNoteTableTriggers ( db ) ;
createSystemFolder ( db ) ;
reCreateNoteTableTriggers ( db ) ; // 重新创建触发器
createSystemFolder ( db ) ; // 创建系统文件夹
Log . d ( TAG , "note table has been created" ) ;
}
// 重新创建便签表的触发器
private void reCreateNoteTableTriggers ( SQLiteDatabase db ) {
// 先删除可能存在的旧触发器
db . execSQL ( "DROP TRIGGER IF EXISTS increase_folder_count_on_update" ) ;
db . execSQL ( "DROP TRIGGER IF EXISTS decrease_folder_count_on_update" ) ;
db . execSQL ( "DROP TRIGGER IF EXISTS decrease_folder_count_on_delete" ) ;
@ -226,6 +213,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db . execSQL ( "DROP TRIGGER IF EXISTS folder_delete_notes_on_delete" ) ;
db . execSQL ( "DROP TRIGGER IF EXISTS folder_move_notes_on_trash" ) ;
// 创建新触发器
db . execSQL ( NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER ) ;
db . execSQL ( NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER ) ;
db . execSQL ( NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER ) ;
@ -235,58 +223,56 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db . execSQL ( FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER ) ;
}
// 创建系统文件夹
private void createSystemFolder ( SQLiteDatabase db ) {
ContentValues values = new ContentValues ( ) ;
/ * *
* call record foler for call notes
* /
// 通话记录文件夹
values . put ( NoteColumns . ID , Notes . ID_CALL_RECORD_FOLDER ) ;
values . put ( NoteColumns . TYPE , Notes . TYPE_SYSTEM ) ;
db . insert ( TABLE . NOTE , null , values ) ;
/ * *
* root folder which is default folder
* /
// 根文件夹(默认文件夹)
values . clear ( ) ;
values . put ( NoteColumns . ID , Notes . ID_ROOT_FOLDER ) ;
values . put ( NoteColumns . TYPE , Notes . TYPE_SYSTEM ) ;
db . insert ( TABLE . NOTE , null , values ) ;
/ * *
* temporary folder which is used for moving note
* /
// 临时文件夹(用于移动便签)
values . clear ( ) ;
values . put ( NoteColumns . ID , Notes . ID_TEMPARAY_FOLDER ) ;
values . put ( NoteColumns . TYPE , Notes . TYPE_SYSTEM ) ;
db . insert ( TABLE . NOTE , null , values ) ;
/ * *
* create trash folder
* /
// 回收站文件夹
values . clear ( ) ;
values . put ( NoteColumns . ID , Notes . ID_TRASH_FOLER ) ;
values . put ( NoteColumns . TYPE , Notes . TYPE_SYSTEM ) ;
db . insert ( TABLE . NOTE , null , values ) ;
}
// 创建数据表
public void createDataTable ( SQLiteDatabase db ) {
db . execSQL ( CREATE_DATA_TABLE_SQL ) ;
reCreateDataTableTriggers ( db ) ;
db . execSQL ( CREATE_DATA_NOTE_ID_INDEX_SQL ) ;
reCreateDataTableTriggers ( db ) ; // 重新创建触发器
db . execSQL ( CREATE_DATA_NOTE_ID_INDEX_SQL ) ; // 创建索引
Log . d ( TAG , "data table has been created" ) ;
}
// 重新创建数据表的触发器
private void reCreateDataTableTriggers ( SQLiteDatabase db ) {
// 先删除可能存在的旧触发器
db . execSQL ( "DROP TRIGGER IF EXISTS update_note_content_on_insert" ) ;
db . execSQL ( "DROP TRIGGER IF EXISTS update_note_content_on_update" ) ;
db . execSQL ( "DROP TRIGGER IF EXISTS update_note_content_on_delete" ) ;
// 创建新触发器
db . execSQL ( DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER ) ;
db . execSQL ( DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER ) ;
db . execSQL ( DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER ) ;
}
// 获取单例实例
static synchronized NotesDatabaseHelper getInstance ( Context context ) {
if ( mInstance = = null ) {
mInstance = new NotesDatabaseHelper ( context ) ;
@ -294,68 +280,83 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
return mInstance ;
}
// 数据库创建回调
@Override
public void onCreate ( SQLiteDatabase db ) {
createNoteTable ( db ) ;
createDataTable ( db ) ;
createNoteTable ( db ) ; // 创建便签表
createDataTable ( db ) ; // 创建数据表
}
// 数据库升级回调
@Override
public void onUpgrade ( SQLiteDatabase db , int oldVersion , int newVersion ) {
boolean reCreateTriggers = false ;
boolean skipV2 = false ;
// 从版本1升级到版本2
if ( oldVersion = = 1 ) {
upgradeToV2 ( db ) ;
skipV2 = true ; // this upgrade including the upgrade from v2 to v3
skipV2 = true ; // 这个升级包括从v2到v3的升级
oldVersion + + ;
}
// 从版本2升级到版本3
if ( oldVersion = = 2 & & ! skipV2 ) {
upgradeToV3 ( db ) ;
reCreateTriggers = true ;
oldVersion + + ;
}
// 从版本3升级到版本4
if ( oldVersion = = 3 ) {
upgradeToV4 ( db ) ;
oldVersion + + ;
}
// 如果需要,重新创建触发器
if ( reCreateTriggers ) {
reCreateNoteTableTriggers ( db ) ;
reCreateDataTableTriggers ( db ) ;
}
// 检查是否升级成功
if ( oldVersion ! = newVersion ) {
throw new IllegalStateException ( "Upgrade notes database to version " + newVersion
+ "fails" ) ;
}
}
// 升级到版本2
private void upgradeToV2 ( SQLiteDatabase db ) {
// 删除旧表
db . execSQL ( "DROP TABLE IF EXISTS " + TABLE . NOTE ) ;
db . execSQL ( "DROP TABLE IF EXISTS " + TABLE . DATA ) ;
// 重新创建表
createNoteTable ( db ) ;
createDataTable ( db ) ;
}
// 升级到版本3
private void upgradeToV3 ( SQLiteDatabase db ) {
// drop unused triggers
// 删除未使用的触发器
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GTask 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
private void upgradeToV4 ( SQLiteDatabase db ) {
// 添加版本号列
db . execSQL ( "ALTER TABLE " + TABLE . NOTE + " ADD COLUMN " + NoteColumns . VERSION
+ " INTEGER NOT NULL DEFAULT 0" ) ;
}