Question

我已经尝试在android中创建数据库，我得到了这个错误，我无法做到理解为什么会发生这种错误，然后我检查代码，但我不能修复，任何人都可以告诉我为什么会出现这个错误以及如何解决这个问题错误。

07-30 12:03:52.144: E/SQLiteLog(5761): (14) cannot open file at line 30176 of [00bb9c9ce4] 07-30 12:03:52.174: E/SQLiteLog(5761): (14) os_unix.c:30176: (2) open(/data/data/com.implysoftwares.HotApps/databases/HotApps) - 07-30 12:03:52.315: E/SQLiteDatabase(5761): Failed to open database '/data/data/com.implysoftwares.HotApps/databases/HotApps'. 07-30 12:03:52.315: E/SQLiteDatabase(5761): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694) 07-30 12:03:52.315: E/SQLiteDatabase(5761): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)

SQLiteDatabase：

private static String DB_PATH = "/data/data/packagename/databases/";
private static String DB_Name = "HotApps";
private SQLiteDatabase myDataBase;
private final Context myContext;

public SQLitedatabase(Context context) {
    super(context, DB_Name, null, 1);
    this.myContext = context;
}

public void createDataBase() throws IOException {

    boolean dbExist = checkDataBase();

    if (dbExist) {
    } else {
        this.getReadableDatabase();
        try {
            copyDataBase();
        } catch (IOException e) {
            throw new Error("Error copying database");
        }
    }
}

private boolean checkDataBase() {
    SQLiteDatabase checkDB = null;
    try {
        String myPath = DB_PATH + DB_Name;
        checkDB = SQLiteDatabase.openDatabase(myPath, null,
                SQLiteDatabase.OPEN_READONLY);
    } catch (SQLiteException e) {
    }
    if (checkDB != null) {
        checkDB.close();
    }
    return checkDB != null ? true : false;
}

private void copyDataBase() throws IOException {
    InputStream myInput = myContext.getAssets().open(DB_Name);
    String outFileName = DB_PATH + DB_Name;
    OutputStream myOutput = new FileOutputStream(outFileName);
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer)) > 0) {
        myOutput.write(buffer, 0, length);
    }
    myOutput.flush();
    myOutput.close();
    myInput.close();
}

public void openDataBase() throws SQLException {
    String myPath = DB_PATH + DB_Name;
    myDataBase = SQLiteDatabase.openDatabase(myPath, null,
            SQLiteDatabase.OPEN_READONLY);
}

public synchronized void close() {

    if (myDataBase != null)
        myDataBase.close();
    super.close();
}

Answer 1

openDatabase的第一个参数必须是数据库文件的完整路径，并且必须是您可以访问的目录。确保路径和文件名正确无误，或使用ContextWrapper.getDatabasePath获取应用的路径。

更好的想法是使用openOrCreateDatabase或SQLiteOpenHelper，为您执行此操作。

Answer 2

首先，您应该检查是否创建了数据库。

如果你有root设备，连接到PC并运行应用程序。否则，启动模拟器。

然后打开终端并输入

adb shell //连接到设备并打开文件系统//获取root cd 数据/数据/ you.package.name /数据库

如何在android中解决这个错误？

2 个答案: