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Update NotesDatabaseHelper.java

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master
pasky49wx 4 weeks ago
parent e940c02ece
commit d064374713
1 changed files with 64 additions and 48 deletions
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源程序代码-小米便签-Notes-master/Notes-master/src/net/micode/notes/data/NotesDatabaseHelper.java
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@ -26,58 +26,61 @@ import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.DataConstants;
import net.micode.notes.data.Notes.NoteColumns;
/**
* 小米便签数据库帮助类，负责数据库的创建和版本管理
*/
public class NotesDatabaseHelper extends SQLiteOpenHelper {
// 数据库名称
private static final String DB_NAME = "note.db";
// 当前数据库版本
private static final int DB_VERSION = 4;
// 数据库表名定义接口
public interface TABLE {
public static final String NOTE = "note";
public static final String NOTE = "note"; // 笔记表
public static final String DATA = "data";
public static final String DATA = "data"; // 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
// 创建笔记表的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" +
"CREATE TABLE " + TABLE.NOTE + "(" +
NoteColumns.ID + " INTEGER PRIMARY KEY," + // 主键ID
NoteColumns.PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 父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," + // 笔记数量(针对文件夹)
NoteColumns.SNIPPET + " TEXT NOT NULL DEFAULT ''," + // 内容摘要
NoteColumns.TYPE + " INTEGER NOT NULL DEFAULT 0," + // 类型(笔记/文件夹)
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," + // 本地修改标记
NoteColumns.ORIGIN_PARENT_ID + " INTEGER NOT NULL DEFAULT 0," + // 原始父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.ID + " INTEGER PRIMARY KEY," + // 主键ID
DataColumns.MIME_TYPE + " TEXT NOT NULL," + // MIME类型
DataColumns.NOTE_ID + " INTEGER NOT NULL DEFAULT 0," + // 关联的笔记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 ''," +
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.DATA1 + " INTEGER," + // 通用数据列1
DataColumns.DATA2 + " INTEGER," + // 通用数据列2
DataColumns.DATA3 + " TEXT NOT NULL DEFAULT ''," + // 通用数据列3
DataColumns.DATA4 + " TEXT NOT NULL DEFAULT ''," + // 通用数据列4
DataColumns.DATA5 + " TEXT NOT NULL DEFAULT ''" + // 通用数据列5
")";
// 创建数据表笔记ID索引的SQL语句
private static final String CREATE_DATA_NOTE_ID_INDEX_SQL =
"CREATE INDEX IF NOT EXISTS note_id_index ON " +
TABLE.DATA + "(" + DataColumns.NOTE_ID + ");";
@ -206,17 +209,24 @@ 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);
}
/**
* 创建笔记表
*/
public void createNoteTable(SQLiteDatabase db) {
db.execSQL(CREATE_NOTE_TABLE_SQL);
reCreateNoteTableTriggers(db);
createSystemFolder(db);
Log.d(TAG, "note table has been created");
}
/**
* 重新创建笔记表相关的触发器
*/
private void reCreateNoteTableTriggers(SQLiteDatabase db) {
db.execSQL("DROP TRIGGER IF EXISTS increase_folder_count_on_update");
db.execSQL("DROP TRIGGER IF EXISTS decrease_folder_count_on_update");
@ -234,7 +244,9 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.execSQL(FOLDER_DELETE_NOTES_ON_DELETE_TRIGGER);
db.execSQL(FOLDER_MOVE_NOTES_ON_TRASH_TRIGGER);
}
/**
* 创建系统文件夹
*/
private void createSystemFolder(SQLiteDatabase db) {
ContentValues values = new ContentValues();
@ -276,12 +288,15 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
db.execSQL(CREATE_DATA_NOTE_ID_INDEX_SQL);
Log.d(TAG, "data table has been created");
}
/**
* 重新创建数据表相关的触发器
*/
private void reCreateDataTableTriggers(SQLiteDatabase db) {
// 删除现有触发器
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");
// 重新创建触发器
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);
@ -296,6 +311,7 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
@Override
public void onCreate(SQLiteDatabase db) {
// 创建数据库时调用，创建表和触发器
createNoteTable(db);
createDataTable(db);
}
@ -304,29 +320,29 @@ public class NotesDatabaseHelper extends SQLiteOpenHelper {
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
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);
}
// 检查版本升级是否成功
if (oldVersion != newVersion) {
throw new IllegalStateException("Upgrade notes database to version " + newVersion
+ "fails");

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