Question

我已经建立了一个数据库并对其进行了编辑。我想在我的Android应用程序中使用该数据库。（API 24）所以我正在将数据库从资产复制到应用程序的数据

File f = getDatabasePath("sozluk.db");
if (!f.exists()) {

            if (!f.getParentFile().exists()) {

                f.getParentFile().mkdir();
            }

        }
            try {

                InputStream is = getAssets().open("sozluk_k.db");
                OutputStream os = new FileOutputStream(f);
                byte[] buffer = new byte[1024];
                int b;
                while ((b = is.read(buffer)) > 0) {
                    os.write(buffer, 0, b);
                }

                os.flush();
                is.close();
                os.close();

            } catch (IOException e) {
                e.printStackTrace();
            }

文件已成功复制，因为我可以通过其他应用程序打开它，但是此代码给出了错误 SQLiteDatabase db = SQLiteDatabase.openDatabase("sozluk.db",null,MODE_PRIVATE);

2018-12-07 22:07:31.297 24549-24549/com.yaksit.ebced W/SQLiteLog: (28) failed to open "//sozluk.db" with flag (131074) and mode_t (0) due to error (2) 2018-12-07 22:07:31.298 24549-24549/com.yaksit.ebced W/SQLiteLog: (28) failed to open "//sozluk.db" with flag (131072) and mode_t (0) due to error (2) 2018-12-07 22:07:31.298 24549-24549/com.yaksit.ebced E/SQLiteLog: (14) cannot open file at line 32887 of [69906880ce] 2018-12-07 22:07:31.298 24549-24549/com.yaksit.ebced E/SQLiteLog: (14) os_unix.c:32887: (2) open(//sozluk.db) - 2018-12-07 22:07:31.298 24549-24549/com.yaksit.ebced E/SQLiteLog: (1) Process om.yaksit.ebced : Pid (24549) Uid (10416) Euid (10416) Gid (10416) Egid (10416) 2018-12-07 22:07:31.298 24549-24549/com.yaksit.ebced E/SQLiteLog: (1) osStat failed "//sozluk.db" due to error (2) 2018-12-07 22:07:31.298 24549-24549/com.yaksit.ebced E/SQLiteLog: (1) Stat of / : st_mode(41777) st_uid(0) st_gid(0) st_ino(2) 2018-12-07 22:07:31.306 24549-24549/com.yaksit.ebced E/SQLiteDatabase: Failed to open database 'sozluk.db'. android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 1294): Could not open database ################################################################# Error Code : 1294 (SQLITE_CANTOPEN_ENOENT) Caused By : Specified directory or database file does not exist. (unknown error (code 1294): Could not open database) ################################################################# at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method) at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:242) at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:203) at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:518) at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:209) at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:181) at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:1156) at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:1101) at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:832) at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:807) at com.yaksit.ebced.MainActivity.oku(MainActivity.java:38) at com.yaksit.ebced.MainActivity.access$100(MainActivity.java:26) at com.yaksit.ebced.MainActivity$1.onClick(MainActivity.java:130) at android.view.View.performClick(View.java:6261) at android.widget.TextView.performClick(TextView.java:11185) at android.view.View$PerformClick.run(View.java:23752) 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:6776) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)

我通过f.getAbsolutePath()检查了它是否存在，并返回了/data/user/0/com.yaksit.ebced/databases/sozluk.db，因此文件是否以某种方式损坏了？

Answer 1

将SQLiteDatabase db = SQLiteDatabase.openDatabase("sozluk.db",null,MODE_PRIVATE);更改为SQLiteDatabase db = openOrCreateDatabase("sozluk.db", MODE_PRIVATE, null);是可行的，但是为什么呢？

从资产复制数据库后，无法打开SQLite数据库

1 个答案: