Android-database Onupgrade // buyu544.com
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Overview. For maximum control over local data, developers can use SQLite directly by leveraging SQLiteOpenHelper for executing SQL requests and managing a local database. In this guide, we'll use the example of building a database to persist user created "Posts" to demonstrate SQLite and SQLiteOpenHelper. Android.Database.Sqlite Android.Database.Sqlite Assembly: Mono.Android.dll. A helper class to manage database creation and version management. In this article. OnUpgradeSQLiteDatabase, Int32, Int32 OnUpgradeSQLiteDatabase, Int32, Int32 Called when the database needs to be upgraded. SQLite Database Debugging. When working with SQLite, opening and inspecting the SQLite database can be helpful while debugging issues. You can leverage the Stetho library to view your data directly, or you can use the following command-line tools to retrieve the data. The commands below will show how to get at the data whether running on an emulator or an actual device. On UpgradeSQLiteDatabase, Int32, Int32 SQLite Open Helper. On UpgradeSQLiteDatabase, Int32, Int32 Method Definition. abstract member OnUpgrade: Android.Database.Sqlite.SQLiteDatabase int int -> unit Parameters. db SQLiteDatabase SQLiteDatabase. The database. oldVersion Int32 Int32. The old database version. 在博主认为,对于入门级学习java的最佳学习方法莫过于视频博客书籍总结,前三者博主将淋漓尽致地挥毫于这篇博客文章中,至于总结在于个人,实际上越到后面你会发现学习的最好方式就是阅读参考官方.

abstract void onUpgradeSQLiteDatabase db, int oldVersion, int newVersion 現在存在するデータベースのバージョンとコンストラクタで渡されたバージョンを比較し、 コンストラクタで渡されたバージョンが大きい場合に呼ばれます。. A Window object is a top-level window with no borders and no menubar. The default layout for a windo. 我们再来第2次测试,卸载安装的。重新安装看看还是原来的数据或者执行的是onCreate方法还是onUpgrade 方法? 结果: 显示: 我们的出一个结论: 当你Android安装一个全新的应用,会从onCreate这个方法里创建。 当你Android在旧版本上更新的时候会从onUpgrade方法里更新。. コンストラクタ java javaではコンストラクタでsuperを呼ぶ `supercontext, DATABASE_NAME, null, DATABASE_VERSION;` kotlin superの呼び方がja. Android数据存储之SQLiteDatabase 概述. SQLiteDatabase是Android提供的用来管理Sqlite database的一种数据持久化解决方案。SQLiteDatabase提供了基本的增删改查方法,可以执行SQL命令,执行其他常见数据库管理任务的方法。.

データベースが存在していてバージョンが変わっていればonUpgradeを呼び出していますね。どちらもトランザクションで囲まれているので、onCreateやonUpgradeの中でトランザクションを使用する必要は無いみたいです。.

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