外部生成的SQLite数据库视为只读Android的SQLiteOpenHelper [英] Externally generated SQLite database considered read-only by Android's SQLiteOpenHelper

问题描述

我有我使用发现这里 SQLite的JDBC连接器已经产生了SQLite数据库。

I have an SQLite database that I have generated using the SQLite JDBC connector found here.

我已经然后复制这个数据库，我的Andr​​oid手机的SD卡，并试图打开它，使用SQLiteOpenHelper。出现以下异常：

I have then copied this database to my Android phone's SD card, and attempted to open it, using an SQLiteOpenHelper. I get the following exceptions:

ERROR/SQLiteOpenHelper(7373): android.database.sqlite.SQLiteException: attempt to write a readonly database: BEGIN EXCLUSIVE;

ERROR/AndroidRuntime(7373): Caused by: android.database.sqlite.SQLiteException: Can't upgrade read-only database from version 0 to 1: /mnt/sdcard/4Trak/4Trak.db

这没有任何意义，我。为什么它是一个只读数据库？我能写它生成它摆在首位，并再次当我意识到我需要一个android_metadata表中，使用一个SQLite浏览器添加它。

This doesn't make any sense to me. Why is it a read-only database? I was able to write to it to generate it in the first place, and again when I realised I would need an android_metadata table, and added it using an SQLite browser.

推荐答案

sqlite的将只开放式数据库从您的应用程序的数据库目录。

Sqlite will only open databases from your applications database directory.

DB_PATH = "/data/data/"+ context.getPackageName() + "/databases/"; 

为了读取和写入数据库，我的理解是，你会需要你的数据库复制到以下位置：

In order to read and write your database, my understanding is that you will need to copy your database to this location:

InputStream myInput = myContext.getAssets().open(DB_NAME);      
String outFileName = DB_PATH + DB_NAME;     
OutputStream myOutput = new FileOutputStream(outFileName);

byte[] buffer = new byte[1024];
int length;
while ((length = myInput.read(buffer))>0){
    myOutput.write(buffer, 0, length);
}

myOutput.flush();
myOutput.close();
myInput.close();

为了做到这一点的副本，你必须首先在你的数据库文件的最终目的地打开一个数据库：

In order to do this copy, you will first have to open a database at the eventual destination of your database file:

checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

让我知道，如果你有任何问题

Let me know if you have any questions

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