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安卓数据库打开异常：未知错误（代码14）：无法打开数据库。

androidandroid-sqlite
75

我已经阅读了各种关于这个问题的现场信息，但是我无法弄清楚。我正在为这个应用程序使用预构建数据库。我正在使用Jelly Bean版本进行此应用程序。

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.quotes"
        android:versionCode="1"
        android:versionName="1.0" >

        <uses-sdk
            android:minSdkVersion="8"
            android:targetSdkVersion="17" />

        <application
            android:allowBackup="true"
            android:icon="@drawable/ic_launcher"
            android:label="@string/app_name"
            android:theme="@style/AppTheme" >
            <activity
                android:name="com.example.quotes.MainActivity"
                android:label="@string/app_name" >
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />

                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>

    </manifest>

日志输出

根据日志输出显示，这是由于SQLiteCantOpenDatabaseException引起的。

06-10 23:07:01.831: E/Trace(4419): error opening trace file: No such file or directory (2)
06-10 23:07:03.611: E/SQLiteLog(4419): (14) cannot open file at line 30176 of [00bb9c9ce4]
06-10 23:07:03.621: E/SQLiteLog(4419): (14) os_unix.c:30176: (2) open(/data/data/com.example.quotes/databasesQuotesdb) - 
06-10 23:07:03.641: E/SQLiteDatabase(4419): Failed to open database '/data/data/com.example.quotes/databasesQuotesdb'.
06-10 23:07:03.641: E/SQLiteDatabase(4419): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at com.example.quotes.DataBaseHelper.checkDataBase(DataBaseHelper.java:94)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at com.example.quotes.DataBaseHelper.createDataBase(DataBaseHelper.java:58)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at com.example.quotes.MainActivity.onCreate(MainActivity.java:34)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.Activity.performCreate(Activity.java:5104)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.os.Looper.loop(Looper.java:137)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at android.app.ActivityThread.main(ActivityThread.java:5041)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at java.lang.reflect.Method.invokeNative(Native Method)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at java.lang.reflect.Method.invoke(Method.java:511)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-10 23:07:03.641: E/SQLiteDatabase(4419):     at dalvik.system.NativeStart.main(Native Method)
06-10 23:07:03.731: E/SQLiteLog(4419): (14) cannot open file at line 30176 of [00bb9c9ce4]
06-10 23:07:03.731: E/SQLiteLog(4419): (14) os_unix.c:30176: (2) open(/data/data/com.example.quotes/databasesQuotesdb) - 
06-10 23:07:03.781: E/SQLiteDatabase(4419): Failed to open database '/data/data/com.example.quotes/databasesQuotesdb'.
06-10 23:07:03.781: E/SQLiteDatabase(4419): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at com.example.quotes.DataBaseHelper.openDataBase(DataBaseHelper.java:145)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at com.example.quotes.MainActivity.onCreate(MainActivity.java:44)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.Activity.performCreate(Activity.java:5104)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.os.Looper.loop(Looper.java:137)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at android.app.ActivityThread.main(ActivityThread.java:5041)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at java.lang.reflect.Method.invokeNative(Native Method)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at java.lang.reflect.Method.invoke(Method.java:511)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-10 23:07:03.781: E/SQLiteDatabase(4419):     at dalvik.system.NativeStart.main(Native Method)
06-10 23:07:03.791: D/AndroidRuntime(4419): Shutting down VM
06-10 23:07:03.791: W/dalvikvm(4419): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
06-10 23:07:03.831: E/AndroidRuntime(4419): FATAL EXCEPTION: main
06-10 23:07:03.831: E/AndroidRuntime(4419): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.quotes/com.example.quotes.MainActivity}: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.os.Looper.loop(Looper.java:137)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.ActivityThread.main(ActivityThread.java:5041)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at java.lang.reflect.Method.invokeNative(Native Method)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at java.lang.reflect.Method.invoke(Method.java:511)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at dalvik.system.NativeStart.main(Native Method)
06-10 23:07:03.831: E/AndroidRuntime(4419): Caused by: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at com.example.quotes.DataBaseHelper.openDataBase(DataBaseHelper.java:145)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at com.example.quotes.MainActivity.onCreate(MainActivity.java:44)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.Activity.performCreate(Activity.java:5104)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
06-10 23:07:03.831: E/AndroidRuntime(4419):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
06-10 23:07:03.831: E/AndroidRuntime(4419):     ... 11 more
06-10 23:07:04.083: D/dalvikvm(4419): GC_CONCURRENT freed 203K, 11% free 2676K/3000K, paused 25ms+18ms, total 306ms
06-10 23:07:07.811: I/Process(4419): Sending signal. PID: 4419 SIG: 9

DataBaseHelper.java

public class DataBaseHelper extends SQLiteOpenHelper{

    //The Android's default system path of your application database.
    private static String DB_PATH = "/data/data/com.example.quotes/databases";

    private static String DB_NAME = "Quotesdb";

    // Table Names of Data Base.
    static final String TABLE_Name = "Quotes";

    // Contacts Table Columns names
    //private static final String _Id = "_Id";
    //private static final String quotes = "quotes";
    //private static final String author = "author";

    private SQLiteDatabase myDataBase; 

    private final Context myContext;

    /**
     * Constructor
     * Takes and keeps a reference of the passed context in order to access to the application assets and resources.
     * @param context
     */
    public DataBaseHelper(Context context) {
        super(context, DB_NAME, null, 1);
        this.myContext = context;
    }

    /**
     * Creates a empty database on the system and rewrites it with your own database.
     * */
    public void createDataBase() throws IOException{

        boolean dbExist = checkDataBase();
        SQLiteDatabase db_Read = null;

        if(dbExist){
            //do nothing - database already exist
        }else{
            //By calling this method and empty database will be created into the default system path
            //of your application so we are gonna be able to overwrite that database with our database.
            db_Read = this.getReadableDatabase(); 
            db_Read.close();

            try {
                copyDataBase();
            } catch (IOException e) {
                //throw new Error("Error copying database");
                e.toString();
            }
        }
    }

    /**
     * Check if the database already exist to avoid re-copying the file each time you open the application.
     * @return true if it exists, false if it doesn't
     */
    private boolean checkDataBase(){

        SQLiteDatabase checkDB = null;

        try{
            String myPath = DB_PATH + DB_NAME;
            checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
        }catch(SQLiteException e){
            //database does't exist yet.
        }

        if(checkDB != null){
            checkDB.close();
        }

        return checkDB != null ? true : false;
    }

    /**
     * Copies your database from your local assets-folder to the just created empty database in the
     * system folder, from where it can be accessed and handled.
     * This is done by transfering bytestream.
     * */
    private void copyDataBase() throws IOException{

        //Open your local db as the input stream
        InputStream myInput = myContext.getAssets().open(DB_NAME);

        // Path to the just created empty db
        String outFileName = DB_PATH + DB_NAME;

        //Open the empty db as the output stream
        OutputStream myOutput = new FileOutputStream(outFileName);

        //transfer bytes from the inputfile to the outputfile
        byte[] buffer = new byte[1024];
        int length;
        while ((length = myInput.read(buffer))>0){
            myOutput.write(buffer, 0, length);
        }

        //Close the streams
        myOutput.flush();
        myOutput.close();
        myInput.close();
    }

    public void openDataBase() throws SQLException{
        //Open the database
        String myPath = DB_PATH + DB_NAME;
        myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

    }

    @Override
    public synchronized void close() {
        if(myDataBase != null)
            myDataBase.close();

        super.close();
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
    }

    /*// Getting single contact
    public List<Quotes> getQuote(int id) {
        ArrayList<Quotes>();
        getReadableDatabase();

        Cursor cursor = db.query(TABLE_Name, new String[] { _Id,
                qotes,author }, _Id + "=?", new String[] { String.valueOf(id) },
                null, null, null, null);

        //String query = "SELECT _Id, qotes, author From "+TABLE_Name;
        //String query = "SELECT * From Quotes";

        //Cursor cursor = db.rawQuery(query, null);

        if (cursor != null)
            cursor.moveToFirst();
        Quotes quotes = new Quotes(Integer.parseInt(cursor.getString(0)),
        cursor.getString(1),cursor.getString(2));
        QuoteList.add(quotes);
        return QuoteList;
    }
    */
}
请提供更多信息。特别是，您做了什么导致了这个错误？ - Code-Apprentice
我在模拟器上运行它，但它崩溃了。不幸的是，应用程序已停止。 - user2438323
我没有使用SQLiteAssetHelper。 - user2438323
当我运行ActivityInstrumentationTestCase2时，我遇到了相同的问题。 - Tim Kist
@user2438323：你好，你的问题解决了吗？我也遇到了类似代码的相似问题。 - Amit Kumar Kannaujiya
显示剩余3条评论
21个回答
2

需要注意的一点是，Environment.getExternalStorageDirectory() 在API 29中已被弃用，如果你在使用它来获取数据库路径，请进行更改：

https://developer.android.com/reference/android/os/Environment#getExternalStorageDirectory()

此方法已在API级别29中弃用。

为了提高用户隐私保护，直接访问共享/外部存储设备已被弃用。当应用程序的目标版本是Build.VERSION_CODES.Q时，从该方法返回的路径不再直接对应用程序开放。应用程序可以通过迁移到其他替代方案（例如Context＃getExternalFilesDir(String)，MediaStore或Intent＃ACTION_OPEN_DOCUMENT）继续访问存储在共享/外部存储上的内容。

1
在运行时出现这样的问题，首先打开logcat（如果您使用的是Android Studio），尝试分析跟踪树，从异常开始上升的地方开始，因为那通常是问题的源头。现在检查两件事情：
  1. 在设备文件浏览器中（右下角），检查是否存在由您创建的数据库。通常可以在DATA -> DATA -> com.example.hpc.demo（您的包名） -> DATABASE -> demo.db找到它。
  2. 检查您的helper类中是否添加了所需的'/'，例如像下面这样：
    DB_location = "/data/data/" + mcontext.getPackageName() + "/databases/";
0
这是由于在初始化SQLitedatabase对象时，您没有外部存储写入权限所致。即
db2=SQLiteDatabase.openOrCreateDatabase(DBPATH, null);

可能是因为您正在请求权限，但尚未允许权限，而数据库实例已初始化。请记住，创建数据库文件需要外部存储权限。只有在您允许权限后才进行所有写操作。您可以在onRequestPermissionsResult中完成此操作。

0
清除应用程序数据对我有所帮助，它可能也会对你有所帮助。
0
android.database.sqlite.SQLiteCantOpenDatabaseException: 未知错误（代码14）：无法打开数据库。如果您在使用设备文件浏览器替换数据库文件后出现此问题，有时这是由于权限和SELinux安全上下文导致的。 设备文件浏览器（从AS3.6.3开始）将以根权限/ rwxrwxrwx设置为所有人（777）上传它们。 在应用程序文件夹中寻找用于应用程序的用户ID。 在终端中执行以下命令：
   adb devices
   emulator-5554
   adb root
   adb -s emulator-5554 shell
   cd /data/data/com.yourorg.yourapp
   ls -l

你将会得到一个类似于以下的列表：

drwxrwx--x 2 u0_a85 u0_a85 4096 2020-04-23 16:09 cache
drwxrwx--x 2 u0_a85 u0_a85 4096 2020-04-23 16:09 code_cache
drwxrwx--x 2 u0_a85 u0_a85 4096 2020-04-23 16:09 databases
drwxrwx--x 2 u0_a85 u0_a85 4096 2020-04-23 16:09 shared_prefs

u0_a85（或其他类似的ID）将成为应用程序的所有者和组ID。 在设备上删除您的数据库，使用设备文件浏览器放入替换数据库文件，并在终端中执行以下操作（请记住所有者ID）：

cd databases
chown u0_a85 *.db; chgrp u0_a85 *.db; chmod 600 *.db; restorecon *.db

这将更改数据库文件的适当所有者/组ID、RW权限，并重置这些文件的SELinux安全上下文。虽然我曾经成功地替换过没有必要这样做的数据库文件，但这个问题似乎发生得足够随机，因此这样做是有效的。

0

你必须使用这种方式来指定路径：

DB_PATH=  context.getDatabasePath(DB_NAME).getPath();
0

正如@CommonsWare所提到的，您可能想尝试android sqlite asset helper。对我来说，这使得打开预先存在的数据库变得轻而易举。

在手动尝试了3个小时后，我只用了半个小时就让它工作了。有趣的是，我以为我正在为自己做与库相同的事情，但还是缺少了一些东西！

0

Android应用程序数据库的默认系统路径为/data/data/YOUR_PACKAGE/databases/YOUR_DB_NAME

您的logcat清楚地显示了 Failed to open database '/data/data/com.example.quotes/databasesQuotesdb'

这意味着给定路径上没有文件或者您提供了错误的数据文件路径。我可以看到在databases文件夹后面应该有“/”。

您的DB_PATH变量应该以“/”结尾。

private static String DB_PATH = "/data/data/com.example.quotes/databases/";

您的正确路径现在将是 "/data/data/com.example.quotes/databases/Quotesdb"

0

我作为用户而不是开发人员遇到了这个问题。在我的情况下，原因不同。

https://del.dog/ufinunacul.txt
事实证明，data文件夹添加了一个损坏的link，指向我存储app data的记忆卡第二分区。 删除broken link后，一切都正常了。

0
在OpenDatabase之前添加以下行：
File outFile = new File(Environment.getDataDirectory(), outFileName);
outFile.setWritable(true);
SQLiteDatabase.openDatabase(outFile.getAbsolutePath(), null, SQLiteDatabase.OPEN_READWRITE);
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