sqliteLog 14:无法在行中打开文件 [英] sqliteLog 14: cannot open file at line
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问题描述
我不知道我的错误在哪里.当数据库不存在并且我的 checkDatabase 方法返回false或我的数据库已过时时，我试图将lyrics.db文件存储在我的DB_PATH中.
I don't know where are my mistakes. I am trying to store the lyrics.db file in my DB_PATH when the database doesn't exist and my checkDatabase method returns false, or my DB is obsolete.
但是，我得到以下信息:-
However, I get the following :-
E/SQLiteLog: (14) cannot open file at line 36356 of [605907e73a]
(14) os_unix.c:36356: (2) open(/data/user/0/id.ac.umn.project_uts_mobile_16862/filesid.ac.umn.project_uts_mobile_16862/databases/lyrics.db) -
(1) Process ts_mobile_16862 : Pid (12455) Uid (10196) Euid (10196) Gid (10196) Egid (10196)
(1) osStat failed "/data/user/0/id.ac.umn.project_uts_mobile_16862/filesid.ac.umn.project_uts_mobile_16862/databases/lyrics.db" due to error (2)
(1) osStat failed "/data/user/0/id.ac.umn.project_uts_mobile_16862/filesid.ac.umn.project_uts_mobile_16862/databases" due to error (2)
(1) osStat failed "/data/user/0/id.ac.umn.project_uts_mobile_16862/filesid.ac.umn.project_uts_mobile_16862" due to error (2)
(1) Stat of /data/user/0/id.ac.umn.project_uts_mobile_16862 : st_mode(40700) st_uid(10196) st_gid(10196) st_ino(265643)
(1) Stat of /data/user/0 : st_mode(40771) st_uid(1000) st_gid(1000) st_ino(262147)
(1) Stat of /data/user : st_mode(40711) st_uid(1000) st_gid(1000) st_ino(196619)
(1) Stat of /data : st_mode(40771) st_uid(1000) st_gid(1000) st_ino(2)
E/SQLiteDatabase: Failed to open database '/data/user/0/id.ac.umn.project_uts_mobile_16862/filesid.ac.umn.project_uts_mobile_16862/databases/lyrics.db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 1294): Could not open database
#################################################################
Error Code : 1294 (SQLITE_CANTOPEN_ENOENT)
Caused By : Specified directory or database file does not exist.
(unknown error (code 1294): Could not open database)
#################################################################
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:272)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:213)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:701)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:272)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:239)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:1276)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:1231)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:915)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:864)
at id.ac.umn.project_uts_mobile_16862.DbHelper.checkDatabase(DbHelper.java:50)
at id.ac.umn.project_uts_mobile_16862.DbHelper.createDB(DbHelper.java:85)
at id.ac.umn.project_uts_mobile_16862.show_lyrics.onCreate(show_lyrics.java:22)
at android.app.Activity.performCreate(Activity.java:7258)
at android.app.Activity.performCreate(Activity.java:7249)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1222)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3059)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1724)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:7000)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:441)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
这是我加载数据库的代码
it's my code for load the DB
public class DbHelper extends SQLiteOpenHelper {
private static String DB_PATH = "";
private static String DB_NAME = "lyrics.db";
private SQLiteDatabase vDatabase;
private Context vContext = null;
public DbHelper(Context context) {
super(context, DB_NAME, null, 1);
if( Build.VERSION.SDK_INT >= 17)
DB_PATH = context.getFilesDir().getPath()+context.getPackageName()+"/databases/";
else
DB_PATH = context.getApplicationInfo().dataDir+"/databases/";
this.vContext = context;
}
@Override
public synchronized void close() {
if( vDatabase != null ) {
vDatabase.close();
}
super.close();
}
private boolean checkDatabase() {
SQLiteDatabase dbTemp = null;
try{
String path = DB_PATH + DB_NAME;
dbTemp = SQLiteDatabase.openDatabase(path, null, OPEN_READWRITE);
} catch ( SQLiteException e) { }
if (dbTemp != null ) {
dbTemp.close();
}
return dbTemp != null;
}
public void copyDB() throws SQLiteException{
try {
InputStream myInput = vContext.getAssets().open(DB_NAME);
String outputFileName = DB_PATH + DB_NAME;
Log.d("LIFECYCLE", outputFileName);
OutputStream myOutput = new FileOutputStream(outputFileName);
byte[] buffer = new byte[1024];
int length;
while( (length=myInput.read(buffer)) > 0 ){
myOutput.write(buffer, 0, length);
}
myOutput.flush();
myOutput.close();
myInput.close();
} catch ( IOException e) {
e.printStackTrace();
}
}
public void openDB() {
String path = DB_PATH + DB_NAME;
vDatabase = SQLiteDatabase.openDatabase(path, null, OPEN_READWRITE);
}
public void createDB() {
boolean dbExist = checkDatabase();
if ( dbExist ){
}
else {
this.getReadableDatabase();
copyDB();
}
}
public List<Lyric> getAllSong(){
List<Lyric> temp = new ArrayList<>();
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor;
try{
cursor = db.rawQuery( "SELECT * FROM lyrics" , null);
if( cursor == null) return null;
cursor.moveToFirst();
do {
Lyric lyric = new Lyric(
cursor.getString(cursor.getColumnIndex("index")),
cursor.getString(cursor.getColumnIndex("song")),
cursor.getString(cursor.getColumnIndex("year")),
cursor.getString(cursor.getColumnIndex("artist")),
cursor.getString(cursor.getColumnIndex("genre")),
cursor.getString(cursor.getColumnIndex("lyrics"))
);
temp.add(lyric);
} while (cursor.moveToNext());
cursor.close();
} catch ( Exception e){ }
db.close();
return temp;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
我已经尝试调试此代码将近15个小时，甚至连一个线索都没有，我的错误在哪里.
I've already trying to debug this code for almost 15 hours, and even don't get a single clue, where are my mistakes.
如何检查该路径是否存在?以及如何使目录/路径不存在?
how to check, if that path exist? and how to make directory / path if it didn't exist?
推荐答案
分步指南.
- 在这种情况下，使用NaviCat，并使用以下SQL创建和填充歌词表.
:-
CREATE TABLE IF NOT EXISTS lyrics (
id INTEGER PRIMARY KEY,
song TEXT,
year TEXT,
artist TEXT,
genre TEXT,
lyrics TEXT
);
INSERT INTO lyrics (song, year, artist, genre, lyrics) VALUES
('song1','1970','Fred','Rock','Rock rock rock'),
('song2','1980','Mary','Pop','Pop pop pop'),
('song3','1960','Sue','Folk','Folk folk folk');
- 注意 index 是一个关键字，因此除非包含在列名中，否则不是有效的列名，因此已使用 id 代替了索引.
- Note index is a keyword so is not a valid column name unless it is enclosed, so id has been used instead of index.
public class DbHelper extends SQLiteOpenHelper { private static String DB_NAME = "lyrics.db"; private SQLiteDatabase vDatabase; private Context vContext; public DbHelper(Context context) { super(context, DB_NAME, null, 1); this.vContext = context; // Copy the DB if need be when instantiating the DbHelper if (!checkDataBase()) { copyDB(); } vDatabase = this.getWritableDatabase(); //Get the database when instantiating } /** * No need for build version check as getDataBasePath works for all versions * No need for open and close of Database, just open it once for the lifetime (more efficient) */ /** * 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() { /** * Does not open the database instead checks to see if the file exists * also creates the databases directory if it does not exists * (the real reason why the database is opened, which appears to result in issues) */ File db = new File(vContext.getDatabasePath(DB_NAME).getPath()); //Get the file name of the database Log.d("DBPATH","DB Path is " + db.getPath()); if (db.exists()) return true; // If it exists then return doing nothing // Get the parent (directory in which the database file would be) File dbdir = db.getParentFile(); // If the directory does not exist then make the directory (and higher level directories) if (!dbdir.exists()) { db.getParentFile().mkdirs(); dbdir.mkdirs(); } return false; } public void copyDB() throws SQLiteException{ try { InputStream myInput = vContext.getAssets().open(DB_NAME); String outputFileName = vContext.getDatabasePath(DB_NAME).getPath(); //<<<<<<<<<< changed Log.d("LIFECYCLE", outputFileName); OutputStream myOutput = new FileOutputStream(outputFileName); byte[] buffer = new byte[1024]; int length; while( (length=myInput.read(buffer)) > 0 ){ myOutput.write(buffer, 0, length); } myOutput.flush(); myOutput.close(); myInput.close(); } catch ( IOException e) { e.printStackTrace(); } } public List<Lyric> getAllSong(){ List<Lyric> temp = new ArrayList<>(); Cursor cursor = vDatabase.query("lyrics",null,null,null,null,null,null); //Cursor cursor = db.rawQuery( "SELECT * FROM lyrics" , null); // used query method generally preferred to rawQuery //if( cursor == null) return null; // Cursor will not be null may be empty //cursor.moveToFirst(); // changed to use simpler loop while (cursor.moveToNext()) { Lyric lyric = new Lyric( //cursor.getString(cursor.getColumnIndex("index")), //<<<<<<< changed due to column name change cursor.getString(cursor.getColumnIndex("id")), cursor.getString(cursor.getColumnIndex("song")), cursor.getString(cursor.getColumnIndex("year")), cursor.getString(cursor.getColumnIndex("artist")), cursor.getString(cursor.getColumnIndex("genre")), cursor.getString(cursor.getColumnIndex("lyrics")) ); temp.add(lyric); } cursor.close(); //db.close(); // inefficient to keep on opening and closing db return temp; } @Override public void onCreate(SQLiteDatabase db) { } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } }- 检查评论是否有修改
以下是将对上述内容进行测试的活动.
The following is an activity that will test the above.
public class MainActivity extends AppCompatActivity { DbHelper vDBHlpr; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); vDBHlpr = new DbHelper(this); List<Lyric> mylyricslist = vDBHlpr.getAllSong(); for (Lyric l: mylyricslist) { Log.d("LYRICFROMDB","Song is " + l.getSong() + " Year is " + l.getYear() + " Artist is " + l.getArtist() + " Genre is " + l.getGenre() + " Lyrics are " + l.getLyrics()); } } }日志应包含(首次运行):-
The log should include (first run) :-
03-17 19:42:11.067 16057-16057/? D/DBPATH: DB Path is /data/data/com.example.so55199382lyrics/databases/lyrics.db 03-17 19:42:11.067 16057-16057/? D/LIFECYCLE: /data/data/com.example.so55199382lyrics/databases/lyrics.db 03-17 19:42:11.086 16057-16057/? D/LYRICFROMDB: Song is song1 Year is 1970 Artist is Fred Genre is Rock Lyrics are Rock rock rock 03-17 19:42:11.086 16057-16057/? D/LYRICFROMDB: Song is song2 Year is 1980 Artist is Mary Genre is Pop Lyrics are Pop pop pop 03-17 19:42:11.086 16057-16057/? D/LYRICFROMDB: Song is song3 Year is 1960 Artist is Sue Genre is Folk Lyrics are Folk folk folk或随后的运行:-
03-17 19:49:11.275 16136-16136/? D/DBPATH: DB Path is /data/data/com.example.so55199382lyrics/databases/lyrics.db 03-17 19:49:11.279 16136-16136/? D/LYRICFROMDB: Song is song1 Year is 1970 Artist is Fred Genre is Rock Lyrics are Rock rock rock 03-17 19:49:11.279 16136-16136/? D/LYRICFROMDB: Song is song2 Year is 1980 Artist is Mary Genre is Pop Lyrics are Pop pop pop 03-17 19:49:11.279 16136-16136/? D/LYRICFROMDB: Song is song3 Year is 1960 Artist is Sue Genre is Folk Lyrics are Folk folk folk- Note运行两次，因此您同时检查复制过程和现有数据库的处理.
以上内容已在运行Android Lollipop和Pie的模拟器上进行了测试
The above was tested on emulators running Android Lollipop and Pie
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