Android SQLiteOpenHelper无法打开数据库文件

Question

我知道这个话题以前讨论过。但我找不到解决问题的办法，所以我要再问一次。我在创建数据库时遇到问题。我复制了SQLiteOpenHelper:的实现

public class DBCreator extends SQLiteOpenHelper 
{
    private static final String DATABASE_NAME = "servision.db";
    private static final int DATABASE_VERSION = 1;

    private static final String INFO_TABLE ="create table INFO(key text,value text);";
    public static final String GATEWAYS_TABLE = "GATEWAYS";
    // Table name
    public static final String TABLE = "events";
    // Columns
    public static final String TIME = "time";
    public static final String TITLE = "title";
    public DBCreator(Context context) 
    {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }
    @Override
    public void onCreate(SQLiteDatabase db) 
    {
        try
        {
            String gatewaytablescript ="create table" +GATEWAYS_TABLE+"(" +
            "id int primary key, " +
            "host text not null," +
            "port int not null," +
            "username text," +
            "password text,"+
            "useproxy int," +
            "proxyHost text," +
            "proxyPort port," +
            "desc text," +
            "secondaryip text," +
            "secondaryport int," +
            "timezone int," +
            "encryption int," +
            "customkey text" +
            ");";
            Log.d("DBCreator", "Creating " + GATEWAYS_TABLE + "table");
            db.execSQL(gatewaytablescript);
            String infotablescript ="create table " + INFO_TABLE + "(key text,value text);";
            Log.d("DBCreator", "Creating " + INFO_TABLE + "table");
            db.execSQL(infotablescript);
        }
        catch(SQLException ex)
        {
            Log.d("DBCreator", "onCreate exception " +ex.getMessage()); 
        }
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
    {
        Log.d("EventsData", "onUpgrade");
        if (oldVersion >= newVersion)
            return;

    }
}

我从主活动onCreate方法中创建它，如下所示。

DBCreator db =new DBCreator(this);
db.getReadableDatabase();

在logcat中，我收到以下信息：

06-01 17:31:15.523: INFO/global(2470): Default buffer size used in BufferedInputStream constructor. It would be better to be explicit if an 8k buffer is required.
06-01 17:31:15.652: INFO/Database(4160): sqlite returned: error code = 14, msg = cannot open file at source line 25467
06-01 17:31:15.652: ERROR/Database(4160): sqlite3_open_v2("/data/data/com.servision.svclient/databases/servision.db", &handle, 6, NULL) failed
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): Couldn't open servision.db for writing (will try read-only):
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160): android.database.sqlite.SQLiteException: unable to open database file
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteDatabase.dbopen(Native Method)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1921)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:883)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:960)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:953)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:602)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:158)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at com.servision.svclient.Main.onCreate(Main.java:52)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.os.Looper.loop(Looper.java:123)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at android.app.ActivityThread.main(ActivityThread.java:4627)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at java.lang.reflect.Method.invokeNative(Native Method)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at java.lang.reflect.Method.invoke(Method.java:521)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
06-01 17:31:15.722: ERROR/SQLiteOpenHelper(4160):     at dalvik.system.NativeStart.main(Native Method)
06-01 17:31:15.738: INFO/Database(4160): sqlite returned: error code = 14, msg = cannot open file at source line 25467
06-01 17:31:15.738: ERROR/Database(4160): sqlite3_open_v2("/data/data/com.servision.svclient/databases/servision.db", &handle, 1, NULL) failed

从未调用DBCreator的onCreate。我在Eclipse的调试模式下在Galaxy S上运行程序。我是否缺少某些权限？可能是上下文不好还是什么？

Answer 1

关于sqlite returned: error code = 14, msg = cannot open file at source line 25467和sqlite3_open_v2("/data/data/com.servision.svclient/databases/servision.db", &handle, 1, NULL) failed错误，这似乎是在没有数据库并且Android试图创建数据库时引起的。

阅读这里

http://androidblogger.blogspot.com/2011/02/instable-android-and-unable-to-open.html

http://www.itsalif.info/content/check-if-database-exist-android-sqlite3openv2-failed

http://code.google.com/p/android/issues/detail?id=949

Answer 2

检查清单中的权限添加

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Answer 3

当我得到这个错误时，我将这个代码用于我的构造函数

public DBClass(Context context) {
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
    context.openOrCreateDatabase(DATABASE_NAME, context.MODE_PRIVATE, null);
}

Answer 4

我的应用程序出现问题，在重新安装应用程序后，用旧的日期库更改我的日期库文件会导致错误。我想问题是旧DB文件的所有者与重新安装的应用程序的文件的所有者不同。因此，它解决了赋予新文件完全权限的问题（777），这样其他用户也可以读取它。

最后，请确保您没有文件权限问题。

Answer 5

我遇到了一个类似的问题，下面是我解决它的方法：

https://stackoverflow.com/a/22743794/1947094

综上所述：

adb shell
cd /data/data/YOUR.APP.PACKAGE/databases/
ls

这将为您提供应用程序使用的数据库列表。

cp your_database.db your_database.db_backup
rm your_database.db

Answer 6

此链接中已引发错误

http://code.google.com/p/android/issues/detail?id=949

使用以下api。。。

context.openOrCreateDatabase（"sample.db"，MODE_PRIVATE，null）；

尝试这个链接

http://www.itsalif.info/content/check-if-database-exist-android-sqlite3openv2-failed