我正在關注this建議使用指南來創建一個包含預加載數據的SQLite數據庫;但我不明白如何生成所需的數據庫文件(.db)。如何導入SQL數據庫文件
我已經使用「DB Browser for SQLite」軟件寫出我的數據庫,但似乎只能將該文件保存爲創建數據庫的命令(CREATE TABLE IF NOT EXISTS
等)。
如何將我的文件保存爲所需的.db格式?
This網站的解決方案是爲什麼我認爲我的文件格式不正確。
對於背景下,我遇到了錯誤如下:
09-02 23:47:58.681 19704-19704/company.app W/SQLiteAssetHelper: copying database from assets...
09-02 23:47:58.682 19704-19704/company.app W/SQLiteAssetHelper: database copy complete
09-02 23:47:58.684 19704-19704/company.app E/SQLiteLog: (26) file is encrypted or is not a database
09-02 23:47:58.684 19704-19704/company.app E/DefaultDatabaseErrorHandler: Corruption reported by sqlite on database: /data/user/0/company.app /databases/app .db
09-02 23:47:58.684 19704-19704/company.app E/DefaultDatabaseErrorHandler: deleting the database file: /data/user/0/company.app /databases/app .db
09-02 23:47:58.686 19704-19704/company.app E/SQLiteLog: (14) cannot open file at line 32504 of [bda77dda96]
09-02 23:47:58.686 19704-19704/company.app E/SQLiteLog: (14) os_unix.c:32504: (2) open(/data/user/0/company.app /databases/app .db) -
09-02 23:47:58.687 19704-19704/company.app E/SQLiteDatabase: Failed to open database '/data/user/0/company.app /databases/app .db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:808)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:796)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:696)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:671)
at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.returnDatabase(SQLiteAssetHelper.java:408)
at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.createOrOpenDatabase(SQLiteAssetHelper.java:401)
at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getWritableDatabase(SQLiteAssetHelper.java:176)
at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:254)
at company.app .MyDatabase.randomiseItBro(MyDatabase.java:33)
at company.app .MainActivity.randomise(MainActivity.java:55)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4695)
at android.view.View.performClick(View.java:5612)
at android.view.View$PerformClick.run(View.java:22285)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
09-02 23:47:58.688 19704-19704/company.app W/SQLiteAssetHelper: could not open database app .db - unknown error (code 14): Could not open database
09-02 23:47:58.689 19704-19704/company.app D/AndroidRuntime: Shutting down VM
09-02 23:47:58.689 19704-19704/company.app E/AndroidRuntime: FATAL EXCEPTION: main
Process: company.app , PID: 19704
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.view.View$DeclaredOnClickListener.onClick(View.java:4700)
at android.view.View.performClick(View.java:5612)
at android.view.View$PerformClick.run(View.java:22285)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4695)
at android.view.View.performClick(View.java:5612)
at android.view.View$PerformClick.run(View.java:22285)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.database.sqlite.SQLiteDatabase.getVersion()' on a null object reference
at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getWritableDatabase(SQLiteAssetHelper.java:178)
at com.readystatesoftware.sqliteasset.SQLiteAssetHelper.getReadableDatabase(SQLiteAssetHelper.java:254)
at company.app .MyDatabase.randomiseItBro(MyDatabase.java:33)
at company.app .MainActivity.randomise(MainActivity.java:55)
at java.lang.reflect.Method.invoke(Native Method)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4695)
at android.view.View.performClick(View.java:5612)
at android.view.View$PerformClick.run(View.java:22285)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
我已經試過這個,但仍然會出錯。我的研究使我相信我的數據庫文件格式不正確;你是說這個文件是以「CREATE TABLE」的形式出現的? –
@TomJames:不需要。如果按照我列出的說明進行操作,您將獲得一個SQLite數據庫文件,SQLite客戶端除了DB Browser for SQLite(例如'sqlite3'命令行工具)以外,還可以使用它。關於你的堆棧跟蹤,完全卸載應用程序,然後嘗試重新安裝並運行它。另外,FWIW,你的'applicationId'和數據庫文件名似乎都有空格,但我的猜測是,這是你如何將材料發佈到你的問題的一個人爲因素。 – CommonsWare
我現在明白了,你已經解決了我的問題。感謝您的耐心;是的,那只是我匆匆粘貼申請和公司名稱而已。 –