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data/NotesDatabaseHelper.java注释

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何思源 4 months ago
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commit 83e1d1c34a
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app/src/main/java/net/micode/notes/data/NotesDatabaseHelper.java
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@ -27,189 +27,198 @@ import net.micode.notes.data.Notes.DataConstants;
import net.micode.notes.data.Notes.NoteColumns; import net.micode.notes.data.Notes.NoteColumns;
// 数据库帮助类，管理笔记应用的数据库创建和版本更新
public class NotesDatabaseHelper extends SQLiteOpenHelper { public class NotesDatabaseHelper extends SQLiteOpenHelper {
// 数据库文件名
private static final String DB_NAME = "note.db"; private static final String DB_NAME = "note.db";
// 数据库版本号
private static final int DB_VERSION = 4; private static final int DB_VERSION = 4;
// 表名接口，定义数据库中的表名常量
public interface TABLE { public interface TABLE {
// 笔记表名
public static final String NOTE = "note"; public static final String NOTE = "note";
// 数据表名
public static final String DATA = "data"; public static final String DATA = "data";
} }
// 日志标签
private static final String TAG = "NotesDatabaseHelper"; private static final String TAG = "NotesDatabaseHelper";
// 单例实例
private static NotesDatabaseHelper mInstance; private static NotesDatabaseHelper mInstance;
// 创建笔记表的SQL语句
private static final String CREATE_NOTE_TABLE_SQL = private static final String CREATE_NOTE_TABLE_SQL =
"CREATE TABLE " + TABLE.NOTE + "(" + "CREATE TABLE " + TABLE.NOTE + "(" +
NoteColumns.ID + " INTEGER PRIMARY KEY," + NoteColumns.ID + " INTEGER PRIMARY KEY," +
NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.ALERTED_DATE + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.BG_COLOR_ID + " 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.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.HAS_ATTACHMENT + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + NoteColumns.MODIFIED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.NOTES_COUNT + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," +
NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.WIDGET_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," + NoteColumns.WIDGET_TYPE + " INTEGER NOT NULL DEFAULT -1," +
NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.SYNC_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.LOCAL_MODIFIED + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," + NoteColumns.GTASK_ID + " TEXT NOT NULL DEFAULT ''," +
NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" + NoteColumns.VERSION + " INTEGER NOT NULL DEFAULT 0" +
")"; ")";
private static final String CREATE_DATA_TABLE_SQL = private static final String CREATE_DATA_TABLE_SQL =
"CREATE TABLE " + TABLE.DATA + "(" + "CREATE TABLE " + TABLE.DATA + "(" +
DataColumns.ID + " INTEGER PRIMARY KEY," + DataColumns.ID + " INTEGER PRIMARY KEY," +
DataColumns.MIME_TYPE + " TEXT NOT NULL," + DataColumns.MIME_TYPE + " TEXT NOT NULL," +
DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," +
NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," + NoteColumns.CREATED_DATE + " INTEGER NOT NULL DEFAULT (strftime('%s','now') * 1000)," +
NoteColumns.MODIFIED_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.CONTENT + " TEXT NOT NULL DEFAULT ''," +
DataColumns.DATA1 + " INTEGER," + DataColumns.DATA1 + " INTEGER," +
DataColumns.DATA2 + " INTEGER," + DataColumns.DATA2 + " INTEGER," +
DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," +
DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," +
DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" +
")"; ")";
// 创建数据表的笔记ID索引SQL
private static final String CREATE_DATA_NOTE_ID_INDEX_SQL = private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
"CREATE INDEX IF NOT EXISTS note_id_index ON " + "CREATE INDEX IF NOT EXISTS note_id_index ON " +
TABLE.DATA + "(" + DataColumns.NOTE_ID + ");"; TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
/** /**
* Increase folder's note count when move note to the folder * 当更新笔记的父文件夹时增加目标文件夹的笔记计数触发器
*/ */
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = private static final String NOTE_INCREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER increase_folder_count_on_update "+ "CREATE TRIGGER increase_folder_count_on_update "+
" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
" BEGIN " + " BEGIN " +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
" END"; " END";
/** /**
* Decrease folder's note count when move note from folder * 当更新笔记的父文件夹时减少原文件夹的笔记计数触发器
*/ */
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER = private static final String NOTE_DECREASE_FOLDER_COUNT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER decrease_folder_count_on_update " + "CREATE TRIGGER decrease_folder_count_on_update " +
" AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE + " AFTER UPDATE OF " + NoteColumns.PARENT_ID + " ON " + TABLE.NOTE +
" BEGIN " + " BEGIN " +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
" AND " + NoteColumns.NOTES_COUNT + ">0" + ";" + " AND " + NoteColumns.NOTES_COUNT + ">0" + ";" +
" END"; " END";
/** /**
* Increase folder's note count when insert new note to the folder * 当插入新笔记时增加目标文件夹的笔记计数触发器
*/ */
private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER = private static final String NOTE_INCREASE_FOLDER_COUNT_ON_INSERT_TRIGGER =
"CREATE TRIGGER increase_folder_count_on_insert " + "CREATE TRIGGER increase_folder_count_on_insert " +
" AFTER INSERT ON " + TABLE.NOTE + " AFTER INSERT ON " + TABLE.NOTE +
" BEGIN " + " BEGIN " +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + " + 1" +
" WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" + " WHERE " + NoteColumns.ID + "=new." + NoteColumns.PARENT_ID + ";" +
" END"; " END";
/** /**
* Decrease folder's note count when delete note from the folder * 当删除笔记时减少原文件夹的笔记计数触发器
*/ */
private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER = private static final String NOTE_DECREASE_FOLDER_COUNT_ON_DELETE_TRIGGER =
"CREATE TRIGGER decrease_folder_count_on_delete " + "CREATE TRIGGER decrease_folder_count_on_delete " +
" AFTER DELETE ON " + TABLE.NOTE + " AFTER DELETE ON " + TABLE.NOTE +
" BEGIN " + " BEGIN " +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" + " SET " + NoteColumns.NOTES_COUNT + "=" + NoteColumns.NOTES_COUNT + "-1" +
" WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID + " WHERE " + NoteColumns.ID + "=old." + NoteColumns.PARENT_ID +
" AND " + NoteColumns.NOTES_COUNT + ">0;" + " AND " + NoteColumns.NOTES_COUNT + ">0;" +
" END"; " END";
/** /**
* Update note's content when insert data with type {@link DataConstants#NOTE} * 当插入数据时更新对应笔记内容的触发器
*/ */
private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER = private static final String DATA_UPDATE_NOTE_CONTENT_ON_INSERT_TRIGGER =
"CREATE TRIGGER update_note_content_on_insert " + "CREATE TRIGGER update_note_content_on_insert " +
" AFTER INSERT ON " + TABLE.DATA + " AFTER INSERT ON " + TABLE.DATA +
" WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + " WHEN new." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
" BEGIN" + " BEGIN" +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
" END"; " END";
/** /**
* Update note's content when data with {@link DataConstants#NOTE} type has changed * 当更新数据时更新对应笔记内容的触发器
*/ */
private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER = private static final String DATA_UPDATE_NOTE_CONTENT_ON_UPDATE_TRIGGER =
"CREATE TRIGGER update_note_content_on_update " + "CREATE TRIGGER update_note_content_on_update " +
" AFTER UPDATE ON " + TABLE.DATA + " AFTER UPDATE ON " + TABLE.DATA +
" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
" BEGIN" + " BEGIN" +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT + " SET " + NoteColumns.SNIPPET + "=new." + DataColumns.CONTENT +
" WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" + " WHERE " + NoteColumns.ID + "=new." + DataColumns.NOTE_ID + ";" +
" END"; " END";
/** /**
* Update note's content when data with {@link DataConstants#NOTE} type has deleted * 当删除数据时清空对应笔记内容的触发器
*/ */
private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER = private static final String DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER =
"CREATE TRIGGER update_note_content_on_delete " + "CREATE TRIGGER update_note_content_on_delete " +
" AFTER delete ON " + TABLE.DATA + " AFTER delete ON " + TABLE.DATA +
" WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" + " WHEN old." + DataColumns.MIME_TYPE + "='" + DataConstants.NOTE + "'" +
" BEGIN" + " BEGIN" +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.SNIPPET + "=''" + " SET " + NoteColumns.SNIPPET + "=''" +
" WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" + " WHERE " + NoteColumns.ID + "=old." + DataColumns.NOTE_ID + ";" +
" END"; " END";
/** /**
* Delete datas belong to note which has been deleted * 当删除笔记时删除相关数据的触发器
*/ */
private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER = private static final String NOTE_DELETE_DATA_ON_DELETE_TRIGGER =
"CREATE TRIGGER delete_data_on_delete " + "CREATE TRIGGER delete_data_on_delete " +
" AFTER DELETE ON " + TABLE.NOTE + " AFTER DELETE ON " + TABLE.NOTE +
" BEGIN" + " BEGIN" +
" DELETE FROM " + TABLE.DATA + " DELETE FROM " + TABLE.DATA +
" WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" + " WHERE " + DataColumns.NOTE_ID + "=old." + NoteColumns.ID + ";" +
" END"; " END";
/** /**
* Delete notes belong to folder which has been deleted * 当删除文件夹时删除其中所有笔记的触发器
*/ */
private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER = private static final String FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER =
"CREATE TRIGGER folder_delete_notes_on_delete " + "CREATE TRIGGER folder_delete_notes_on_delete " +
" AFTER DELETE ON " + TABLE.NOTE + " AFTER DELETE ON " + TABLE.NOTE +
" BEGIN" + " BEGIN" +
" DELETE FROM " + TABLE.NOTE + " DELETE FROM " + TABLE.NOTE +
" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
" END"; " END";
/** /**
* Move notes belong to folder which has been moved to trash folder * 当文件夹移动到垃圾桶时，将其中的笔记也移动到垃圾桶的触发器
*/ */
private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER = private static final String FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER =
"CREATE TRIGGER folder_move_notes_on_trash " + "CREATE TRIGGER folder_move_notes_on_trash " +
" AFTER UPDATE ON " + TABLE.NOTE + " AFTER UPDATE ON " + TABLE.NOTE +
" WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + " WHEN new." + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
" BEGIN" + " BEGIN" +
" UPDATE " + TABLE.NOTE + " UPDATE " + TABLE.NOTE +
" SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER + " SET " + NoteColumns.PARENT_ID + "=" + Notes.ID_TRASH_FOLER +
" WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" + " WHERE " + NoteColumns.PARENT_ID + "=old." + NoteColumns.ID + ";" +
" END"; " END";
// 构造方法，调用父类构造方法
public NotesDatabaseHelper(Context context) { public NotesDatabaseHelper(Context context) {
super(context, DB_NAME, null, DB_VERSION); super(context, DB_NAME, null, DB_VERSION);
} }
// 创建笔记表
public void createNoteTable(SQLiteDatabase db) { public void createNoteTable(SQLiteDatabase db) {
db.execSQL(CREATE_NOTE_TABLE_SQL); db.execSQL(CREATE_NOTE_TABLE_SQL);
reCreateNoteTableTriggers(db); reCreateNoteTableTriggers(db);
@ -217,6 +226,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
Log.d(TAG, "note table has been created"); Log.d(TAG, "note table has been created");
} }
// 重建笔记表的触发器
private void reCreateNoteTableTriggers(SQLiteDatabase db) { private void reCreateNoteTableTriggers(SQLiteDatabase db) {
db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update"); 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_update");
@ -235,18 +245,19 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER); db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
} }
// 创建系统文件夹
private void createSystemFolder(SQLiteDatabase db) { private void createSystemFolder(SQLiteDatabase db) {
ContentValues values = new ContentValues(); 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.ID, Notes.ID_CALL_RECORD_FOLDER);
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
db.insert(TABLE.NOTE, null, values); db.insert(TABLE.NOTE, null, values);
/** /**
* root folder which is default folder * 根文件夹，默认文件夹
*/ */
values.clear(); values.clear();
values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER); values.put(NoteColumns.ID, Notes.ID_ROOT_FOLDER);
@ -254,7 +265,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.insert(TABLE.NOTE, null, values); db.insert(TABLE.NOTE, null, values);
/** /**
* temporary folder which is used for moving note * 临时文件夹，用于移动笔记
*/ */
values.clear(); values.clear();
values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER); values.put(NoteColumns.ID, Notes.ID_TEMPARAY_FOLDER);
@ -262,7 +273,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.insert(TABLE.NOTE, null, values); db.insert(TABLE.NOTE, null, values);
/** /**
* create trash folder * 垃圾桶文件夹
*/ */
values.clear(); values.clear();
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
@ -270,6 +281,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.insert(TABLE.NOTE, null, values); db.insert(TABLE.NOTE, null, values);
} }
// 创建数据表
public void createDataTable(SQLiteDatabase db) { public void createDataTable(SQLiteDatabase db) {
db.execSQL(CREATE_DATA_TABLE_SQL); db.execSQL(CREATE_DATA_TABLE_SQL);
reCreateDataTableTriggers(db); reCreateDataTableTriggers(db);
@ -277,6 +289,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
Log.d(TAG, "data table has been created"); Log.d(TAG, "data table has been created");
} }
// 重建数据表的触发器
private void reCreateDataTableTriggers(SQLiteDatabase db) { private void reCreateDataTableTriggers(SQLiteDatabase db) {
db.execSQL("DROP TRIGGER IF EXISTS update_note_content_on_insert"); 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_update");
@ -287,6 +300,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER); db.execSQL(DATA_UPDATE_NOTE_CONTENT_ON_DELETE_TRIGGER);
} }
// 获取数据库帮助类的单例实例
static synchronized NotesDatabaseHelper getInstance(Context context) { static synchronized NotesDatabaseHelper getInstance(Context context) {
if (mInstance == null) { if (mInstance == null) {
mInstance = new NotesDatabaseHelper(context); mInstance = new NotesDatabaseHelper(context);
@ -294,12 +308,14 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
return mInstance; return mInstance;
} }
// 当数据库首次创建时调用
@Override @Override
public void onCreate(SQLiteDatabase db) { public void onCreate(SQLiteDatabase db) {
createNoteTable(db); createNoteTable(db);
createDataTable(db); createDataTable(db);
} }
// 当数据库版本需要升级时调用
@Override @Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
boolean reCreateTriggers = false; boolean reCreateTriggers = false;
@ -307,7 +323,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
if (oldVersion == 1) { if (oldVersion == 1) {
upgradeToV2(db); upgradeToV2(db);
skipV2 = true; // this upgrade including the upgrade from v2 to v3 skipV2 = true; // 这个升级包含了从版本2到3的升级
oldVersion++; oldVersion++;
} }
@ -333,6 +349,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
} }
} }
// 升级到版本2
private void upgradeToV2(SQLiteDatabase db) { private void upgradeToV2(SQLiteDatabase db) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE); db.execSQL("DROP TABLE IF EXISTS " + TABLE.NOTE);
db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA); db.execSQL("DROP TABLE IF EXISTS " + TABLE.DATA);
@ -340,23 +357,25 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
createDataTable(db); createDataTable(db);
} }
// 升级到版本3
private void upgradeToV3(SQLiteDatabase db) { 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_insert");
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete"); db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_delete");
db.execSQL("DROP TRIGGER IF EXISTS update_note_modified_date_on_update"); 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 db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.GTASK_ID
+ " TEXT NOT NULL DEFAULT ''"); + " TEXT NOT NULL DEFAULT ''");
// add a trash system folder // 添加垃圾桶系统文件夹
ContentValues values = new ContentValues(); ContentValues values = new ContentValues();
values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER); values.put(NoteColumns.ID, Notes.ID_TRASH_FOLER);
values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM); values.put(NoteColumns.TYPE, Notes.TYPE_SYSTEM);
db.insert(TABLE.NOTE, null, values); db.insert(TABLE.NOTE, null, values);
} }
// 升级到版本4
private void upgradeToV4(SQLiteDatabase db) { private void upgradeToV4(SQLiteDatabase db) {
db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION db.execSQL("ALTER TABLE " + TABLE.NOTE + " ADD COLUMN " + NoteColumns.VERSION
+ " INTEGER NOT NULL DEFAULT 0"); + " INTEGER NOT NULL DEFAULT 0");
} }
} }
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