Android - 无法打开[SQL]数据库错误

时间：2012-07-16 23:08:35

标签： android database sqlite

我目前正在为Android SDK制作一个应用程序，允许我打开/复制已在应用程序之外创建的数据库。我无法让我的程序读取数据库中的表。根据我之前发布的question的一些建议，我写了一个类，它将直接调用SQLiteDatabase，并在Android SDK附带的sqlite3版本中创建我的数据库。现在，由于某种原因，我的程序甚至无法打开数据库。它似乎意识到它存在，但Logcat（我使用带有ADT插件的Eclipse Juno）现在告诉我它“无法打开数据库”。任何人都知道问题可能是什么？

这是我的所有代码（为了彻底）：

public class MyDatabase
{
private static final String TABLE_OS = "OregonState";
private static final String COLUMN_ID = "_id";
private static final String COLUMN_NAME = "Name";
private static final String COLUMN_FIELD = "Field";

SQLiteDatabase database;
String path;

public MyDatabase()
{
        File file = new File("/scratch/android-sdk-linux/tools/os.sqlite");
        database = SQLiteDatabase.openOrCreateDatabase(file, null);
        path = database.getPath();
        database.close();
}

public long insert(ContentValues values, String name, String field)
{
    database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
    values.put("Name", name);
    values.put("Field", field);
    long id = database.insert(TABLE_OS, null, values);
    database.close();
    return id;
}

public long insert(ContentValues values, String name)
{
    database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
    values.put("Name", name);
    long id = database.insert(TABLE_OS, null, values);
    database.close();
    return id;
}

public int delete(int id)
{
    database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
    database.delete(TABLE_OS, COLUMN_ID + "=" + id, null);
    database.close();
    return 1;
}

public int update(ContentValues values, int id, String name, String field)
{
    database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
    values.put("Name", name);
    values.put("Field", field);
    database.update(TABLE_OS, values, COLUMN_ID + "=" + id, null);
    database.close();
    return 1;
}

public int update(ContentValues values, int id, String name)
{
    database = SQLiteDatabase.openDatabase(path, null, SQLiteDatabase.OPEN_READWRITE);
    values.put("Name", name);
    database.update(TABLE_OS, values, COLUMN_ID + "=" + id, null);
    database.close();
    return 1;
}

public Cursor get(int id)
{
    return database.query(TABLE_OS, new String[] {COLUMN_ID, COLUMN_NAME, COLUMN_FIELD}, COLUMN_ID + "=" + id, null, null, null, null);
}

public Cursor getAll()
{
    return database.query(TABLE_OS, new String[] {COLUMN_ID, COLUMN_NAME, COLUMN_FIELD}, null, null, null, null, null);
}
}


public class SQLTest extends Activity
{
SQLAdapter adapter;
MyDatabase database;

@Override
public void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sqltest);
    database = new MyDatabase();
    database.getAll();
}

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    getMenuInflater().inflate(R.menu.activity_sqltest, menu);
    return true;
} 

public long insert(String name, String field)
{
    ContentValues values = new ContentValues();
    long id = database.insert(values, name, field);
    return id;
}

public long insert(String name)
{
    ContentValues values = new ContentValues();
    long id = database.insert(values, name);
    return id;
}

public int delete(int id)
{
    int rowsDeleted = database.delete(id);
    return rowsDeleted;
}

public int update(int id, String name, String field)
{
    ContentValues values = new ContentValues();
    int rowsUpdated = database.update(values, id, name, field);
    return rowsUpdated;
}

public int update(int id, String name)
{
    ContentValues values = new ContentValues();
    int rowsUpdated = database.update(values, id, name);
    return rowsUpdated;
}

public void get(int id)
{
    Cursor cursor = database.get(id);
    TextView tv = new TextView(this);
    String table = "";
    if (cursor.moveToFirst())
        table += "\n" + cursor.getString(0) + " " + cursor.getString(1) + " " + cursor.getString(2);
    else
        table += "No hall found with ID: " + id;
    tv.setText(table);
    setContentView(tv);
    cursor.close();
}

public void getAll()
{
    TextView tv = new TextView(this);
    String table = "";
    try
    {
        Cursor cursor = database.getAll();
        if (cursor.moveToFirst())
        {
            do
            {
                table += "\n" + cursor.getString(0) + " " + cursor.getString(1) + " " + cursor.getString(2);
            } while (cursor.moveToNext());
        }
        cursor.close();
    } catch (Exception e) {}
    tv.setText(table);
    setContentView(tv);
}
}

这也是我的Logcat日志：

07-16 15:27:08.364: E/Trace(810): error opening trace file: No such file or directory (2)
07-16 15:27:08.504: E/SQLiteLog(810): (14) cannot open file at line 30174 of [00bb9c9ce4]
07-16 15:27:08.504: E/SQLiteLog(810): (14) os_unix.c:30174: (2) open(/scratch/android-sdk-linux/tools/os.sqlite) - 
07-16 15:27:08.524: E/SQLiteDatabase(810): Failed to open database '/scratch/android-sdk-linux/tools/os.sqlite'.
07-16 15:27:08.524: E/SQLiteDatabase(810): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:709)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:702)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at com.example.sql2.MyDatabase.<init>(MyDatabase.java:26)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at com.example.sql2.SQLTest.onCreate(SQLTest.java:20)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.Activity.performCreate(Activity.java:5008)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.ActivityThread.access$600(ActivityThread.java:130)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.os.Looper.loop(Looper.java:137)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at android.app.ActivityThread.main(ActivityThread.java:4745)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at java.lang.reflect.Method.invokeNative(Native Method)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at java.lang.reflect.Method.invoke(Method.java:511)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-16 15:27:08.524: E/SQLiteDatabase(810):  at dalvik.system.NativeStart.main(Native Method)
07-16 15:27:08.524: D/AndroidRuntime(810): Shutting down VM
07-16 15:27:08.524: W/dalvikvm(810): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
07-16 15:27:08.534: E/AndroidRuntime(810): FATAL EXCEPTION: main
07-16 15:27:08.534: E/AndroidRuntime(810): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sql2/com.example.sql2.SQLTest}: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
07-16 15:27:08.534: E/AndroidRuntime(810):  at   android.app.ActivityThread.access$600(ActivityThread.java:130)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.os.Looper.loop(Looper.java:137)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.ActivityThread.main(ActivityThread.java:4745)
07-16 15:27:08.534: E/AndroidRuntime(810):  at java.lang.reflect.Method.invokeNative(Native Method)
07-16 15:27:08.534: E/AndroidRuntime(810):  at java.lang.reflect.Method.invoke(Method.java:511)
07-16 15:27:08.534: E/AndroidRuntime(810):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
07-16 15:27:08.534: E/AndroidRuntime(810):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
07-16 15:27:08.534: E/AndroidRuntime(810):  at dalvik.system.NativeStart.main(Native Method)
07-16 15:27:08.534: E/AndroidRuntime(810): Caused by: android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
07-16 15:27:08.534: E/AndroidRuntime(810):  at  android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:709)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:702)
07-16 15:27:08.534: E/AndroidRuntime(810):  at com.example.sql2.MyDatabase.<init>(MyDatabase.java:26)
07-16 15:27:08.534: E/AndroidRuntime(810):  at com.example.sql2.SQLTest.onCreate(SQLTest.java:20)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.Activity.performCreate(Activity.java:5008)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
07-16 15:27:08.534: E/AndroidRuntime(810):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
07-16 15:27:08.534: E/AndroidRuntime(810):  ... 11 more

5 个答案:

答案 0 :(得分：2)

将此权限添加到您的项目

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

答案 1 :(得分：1)

Logcat显示该目录不存在。这并不奇怪，因为在Android设备上通常根目录下没有临时目录。

最好避免使用绝对路径名，也不能确定它们是否总是存在于您的应用可能运行的不同设备上。访问应用程序文件的正确方法是在打开文件时使用Environment。例如：

File file = new File(Environment.getExternalStorageDirectory() + "/scratch/os.sqlite");

这通常存在于SD卡或内部存储器上指定为“sd卡”的软链接目录中。因此，此示例将在临时目录下的SD卡上打开一个文件。

如何将数据库文件导入设备或模拟器取决于您。如果您正在使用模拟器，则可以使用文件资源管理器将文件推送到相应的目录中。

答案 2 :(得分：1)

Android默认情况下会压缩大小超过1MB的文件。较旧版本的Android OS存在一个错误，导致压缩资源文件被错误地读取。最简单的解决方案是使用资源文件扩展名，例如＆＃34; .mp3＆＃34;

答案 3 :(得分：0)

据我记忆，Android文件系统中没有“scratch”目录。当你打电话

File file = new File("/scratch/android-sdk-linux/tools/os.sqlite");
database = SQLiteDatabase.openOrCreateDatabase(file, null);

我认为第二个语句会因为/scratch/android-sdk-linux/tools/os.sqlite文件路径不存在而引发一些错误。尝试拨打file.mkdirs()或file.createNewFile()。

答案 4 :(得分：0)

我回答了另一个问题给我的答案，并使用两个独立的类重新编写了我的代码，以及Adapter和Helper，结果证明它完美无缺。我正在为代码提供link，以防其他人像我一样在开发SQLiteDatabase时遇到问题。

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