我有一个已经投入生产多年的应用程序。它附带标准的 Sqlite DB。该应用程序的最新版本集成了 SqlCipher 3.5.6 库。
新数据库中有一些额外的表，所以我在 onUpgrade 方法中创建了它们。
我在我的应用程序对象中调用了以下方法。
SQLiteDatabase.loadLibs(this);
旧 apk 中的 DB_VERSION 为 56，我在新 apk 中将其设置为 57，因此应该调用 onUpgrade。
我从 onUpgrade 内部调用 encrypt 方法。
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.e(TAG, "++++++++++++++++++++++++++SQLiteOpenHelper onUpgrade old version = " + oldVersion + " new version = " + newVersion);
if(oldVersion == 56){
String sqlToCreateWeeklySummary = String
.format("create table %s ( %s INTEGER primary key, %s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT, %s TEXT)",
TABLEWEEKLYSUMMARY, C_ID_WEEKLY_SUMMARY, C_WEEKLY_SUMMARY_STARTDATE,
C_WEEKLY_SUMMARY_PLANNEDCALLS, C_WEEKLY_SUMMARY_NCR, C_WEEKLY_SUMMARY_QA, C_WEEKLY_SUMMARY_PLANNEDHOURS,
C_WEEKLY_SUMMARY_ACTUALCALLS, C_WEEKLY_SUMMARY_ACTUALHOURS);
db.execSQL(sqlToCreateWeeklySummary);
Log.e(TAG, "onUpgrade " + sqlToCreateWeeklySummary);
more table upgrades................
NfcScannerApplication.setJustUpgradedDBTrue();
NfcScannerApplication.setDownloadingCompOptsAfterUpgradeTrue();
try {
encrypt(context, "carefreemobiledb.db", "");
}catch(Exception e){}
}
}//end of onUpgrade
.
public void encrypt(Context ctxt, String dbName, String passphrase) throws IOException {
Log.e(TAG, "inside encrypt");
File originalFile=ctxt.getDatabasePath(dbName);
if (originalFile.exists()) {
Log.e(TAG, "originalFile exists1");
File newFile= File.createTempFile("sqlcipherutils", "tmp", ctxt.getCacheDir());
Log.e(TAG, "created newFile2");
SQLiteDatabase db= SQLiteDatabase.openDatabase(originalFile.getAbsolutePath(),
"", null, SQLiteDatabase.OPEN_READWRITE);
Log.e(TAG, "opened DB using originalFile3");
db.rawExecSQL(String.format("ATTACH DATABASE '%s' AS encrypted KEY '%s';",
newFile.getAbsolutePath(), passphrase));
Log.e(TAG, "Attached DB4");
db.rawExecSQL("SELECT sqlcipher_export('encrypted')");
Log.e(TAG, "export5");
db.rawExecSQL("DETACH DATABASE encrypted;");
Log.e(TAG, "detached DB6");
int version=db.getVersion();
db.close();
Log.e(TAG, "closed DB7");
db= SQLiteDatabase.openDatabase(newFile.getAbsolutePath(),
passphrase, null,
SQLiteDatabase.OPEN_READWRITE);
Log.e(TAG, "opened DB with newFile8");
db.setVersion(version);
Log.e(TAG, "set version for db using newFile9");
db.close();
Log.e(TAG, "closed db10");
originalFile.delete();
Log.e(TAG, "deleted orignial file11");
newFile.renameTo(originalFile);
Log.e(TAG, "renamed newFile to orginalFile12");
}
}
当我将新的 apk 加载到安装了旧应用程序的设备上时，我收到以下错误。
file is encrypted or is not a database: , while compiling: select count(*) from sqlite_master;
net.sqlcipher.database.SQLiteException: file is encrypted or is not a database: , while compiling: select count(*) from sqlite_master;
at net.sqlcipher.database.SQLiteCompiledSql.native_compile(Native Method)
at net.sqlcipher.database.SQLiteCompiledSql.compile(Unknown Source)
at net.sqlcipher.database.SQLiteCompiledSql.<init>(Unknown Source)
at net.sqlcipher.database.SQLiteProgram.<init>(Unknown Source)
at net.sqlcipher.database.SQLiteQuery.<init>(Unknown Source)
at net.sqlcipher.database.SQLiteDirectCursorDriver.query(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.rawQueryWithFactory(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.rawQuery(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.keyDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openDatabaseInternal(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openOrCreateDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteOpenHelper.getWritableDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteOpenHelper.getReadableDatabase(Unknown Source)
at com.carefreegroup.rr3.g.c(Unknown Source)
at com.carefreegroup.rr3.EntryActivity.onCreate(Unknown Source)
at android.app.Activity.performCreate(Activity.java:6912)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2900)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
04-26 10:40:53.332 9417-9417/? E/SQLiteOpenHelper: Couldn't open carefreemobiledb.db for writing (will try read-only):
我试过的：
SO上的其他帖子说加密方法的密码需要是一个空字符串，以便SqlCipher可以打开一个未加密的数据库。
我已在加密方法上将密码设置为“”，但日志显示无法打开数据库。
谁能告诉我为什么没有打开数据库？它没有达到 onUpgrade 方法。
注意。值得注意的是，当我清除应用程序上的数据时，它工作正常。
[更新 1]
我已将 encrypt 方法移到 Application 类中。在 Application 类的 onCreate 中，我调用：
SQLiteDatabase.loadLibs(this);
Log.e(TAG, "just called SQLiteDatabase.loadLibs(this)");
try {
encrypt(mContext, "carefreemobiledb.db", "");
}catch(Exception e){}
.
密码短语的加密方法中仍然有一个空字符串参数，但它什么也不做，因为我在下面的实际加密方法中已将其注释掉。
public static void encrypt(Context ctxt, String dbName, String passphrase) throws IOException {
File originalFile=ctxt.getDatabasePath(dbName);
if (originalFile.exists()) {
Log.e(TAG, "originalFile exists1");
File newFile= File.createTempFile("sqlcipherutils", "tmp", ctxt.getCacheDir());
Log.e(TAG, "created newFile2");
SQLiteDatabase db= SQLiteDatabase.openDatabase(originalFile.getAbsolutePath(),
"", null, SQLiteDatabase.OPEN_READWRITE);
Log.e(TAG, "opened DB using originalFile3");
// db.rawExecSQL(String.format("ATTACH DATABASE '%s' AS encrypted KEY '%s';",
// newFile.getAbsolutePath(), passphrase));
db.rawExecSQL(String.format("ATTACH DATABASE '%s' AS encrypted KEY '%s';",
newFile.getAbsolutePath()));
Log.e(TAG, "Attached DB4");
db.rawExecSQL("SELECT sqlcipher_export('encrypted')");
Log.e(TAG, "export5");
db.rawExecSQL("DETACH DATABASE encrypted;");
Log.e(TAG, "detached DB6");
int version=db.getVersion();
db.close();
Log.e(TAG, "closed DB7");
db= SQLiteDatabase.openDatabase(newFile.getAbsolutePath(),
passphrase, null,
SQLiteDatabase.OPEN_READWRITE);
Log.e(TAG, "opened DB with newFile8");
db.setVersion(version);
Log.e(TAG, "set version for db using newFile9");
db.close();
Log.e(TAG, "closed db10");
originalFile.delete();
Log.e(TAG, "deleted orignial file11");
newFile.renameTo(originalFile);
Log.e(TAG, "renamed newFile to orginalFile12");
}
}
.
我现在收到以下错误：
04-26 13:56:02.793 15460-15460/? E/NfcScannerApplication: just called SQLiteDatabase.loadLibs(this)
04-26 13:56:02.793 15460-15460/? E/NfcScannerApplication: originalFile exists1
04-26 13:56:02.794 15460-15460/? E/NfcScannerApplication: created newFile2
04-26 13:56:02.798 15460-15460/? E/NfcScannerApplication: opened DB using originalFile3
04-26 13:56:02.806 3247-3247/? E/audit: type=1320 audit(1493211362.789:23690):
04-26 13:56:02.817 3247-3247/? E/audit: type=1320 audit(1493211362.799:23691):
04-26 13:56:02.828 3247-3247/? E/audit: type=1320 audit(1493211362.809:23692):
04-26 13:56:02.886 15460-15469/? E/Database: close() was never explicitly called on database '/data/user/0/com.carefreegroup.rr3/databases/carefreemobiledb.db'
net.sqlcipher.database.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here
at net.sqlcipher.database.SQLiteDatabase.<init>(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(Unknown Source)
at net.sqlcipher.database.SQLiteDatabase.openDatabase(Unknown Source)
at com.carefreegroup.rr3.NfcScannerApplication.a(Unknown Source)
at com.carefreegroup.rr3.NfcScannerApplication.onCreate(Unknown Source)
at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1032)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5881)
at android.app.ActivityThread.-wrap3(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1718)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
.
它达到以下并崩溃：
Log.e(TAG, "opened DB using originalFile3");
.
[更新 2]
我不确定我是否正确关闭了数据库。LoginValidate 是我的 DB 类，它公开了一个返回 DB 对象的方法。
SQLiteDatabase.loadLibs(this);
Log.e(TAG, "just called SQLiteDatabase.loadLibs(this)");
loginValidate.getDB().close();
try {
encrypt(mContext, "carefreemobiledb.db", "");
}catch(Exception e){}
.
另外我不确定加密方法中的密码。您说不要使用密码，但这是否意味着空字符串或根本不传递密码。我将给出以下示例。第一个是原始的，另外两个是我尝试过的。
Log.e(TAG, "opened DB using originalFile3");
db.rawExecSQL(String.format("ATTACH DATABASE '%s' AS encrypted KEY '%s';",
newFile.getAbsolutePath(), passphrase));
Log.e(TAG, "opened DB using originalFile3");
db.rawExecSQL(String.format("ATTACH DATABASE '%s' AS encrypted KEY '%s';",
newFile.getAbsolutePath(), ""));
Log.e(TAG, "opened DB using originalFile3");
db.rawExecSQL(String.format("ATTACH DATABASE '%s';",
newFile.getAbsolutePath()));