我有一段访问SQLite数据库的代码，直到Jelly Bean才能完美运行。在这种情况下，并非所有数据都来自数据库（至少第一列被忽略） 并且还给出错误“未知错误（代码14）无法打开数据库”，尽管从中读取了一些数据。 如果你没有得到这种情况，请询问更多细节
谢谢！
private class DataBaseHelper extends SQLiteOpenHelper {
private SQLiteDatabase myDataBase;
public DataBaseHelper() {
super(myContext, DB_NAME, null, 1);
DB_PATH = "/data/data/" + myContext.getPackageName()
+ "/databases/";
}
/**
* Creates a empty database on the system and rewrites it with your own
* database.
* */
public void createDataBase() throws IOException {
boolean dbExist = checkDataBase();
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.
this.getReadableDatabase();
try {
copyDataBase();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private boolean checkDataBase() {
SQLiteDatabase checkDB = null;
try {
String myPath = myContext.getDatabasePath(DB_NAME).getAbsolutePath();
checkDB = SQLiteDatabase.openDatabase(myPath, null,
SQLiteDatabase.NO_LOCALIZED_COLLATORS);
} 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.NO_LOCALIZED_COLLATORS);
}
这是LogCat错误
01-11 14:36:32.153: E/SQLiteLog(15050): (14) cannot open file at line 30174 of [00bb9c9ce4]
01-11 14:36:32.153: E/SQLiteLog(15050): (14) os_unix.c:30174: (2) open(/data/data/eu.isdc.cabinCrew/databases/database.sqlite) -
01-11 14:36:32.183: E/SQLiteDatabase(15050): Failed to open database '/data/data/eu.isdc.cabinCrew/databases/database.sqlite'.
01-11 14:36:32.183: E/SQLiteDatabase(15050): android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:804)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:789)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at eu.isdc.cabinCrew.a.b.c(Unknown Source)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at eu.isdc.cabinCrew.a.b.a(Unknown Source)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at eu.isdc.cabinCrew.a.a.<init>(Unknown Source)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at eu.isdc.cabinCrew.a.a.a(Unknown Source)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at eu.isdc.cabinCrew.activities.TrainingActivity.onCreate(Unknown Source)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.Activity.performCreate(Activity.java:5008)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.ActivityThread.access$600(ActivityThread.java:130)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.os.Handler.dispatchMessage(Handler.java:99)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.os.Looper.loop(Looper.java:137)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at android.app.ActivityThread.main(ActivityThread.java:4745)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at java.lang.reflect.Method.invokeNative(Native Method)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at java.lang.reflect.Method.invoke(Method.java:511)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
01-11 14:36:32.183: E/SQLiteDatabase(15050): at dalvik.system.NativeStart.main(Native Method)
01-11 14:36:32.503: E/SQLiteLog(15050): (1) no such table: airdata
它确实打开了数据库，但是找不到那个特定的表，即使它在那里。这只发生在Jelly Bean上。数据库与此版本的交互有什么变化吗？
答案 0 :(得分：0)
您无法假设数据库始终位于“/ data / data /”。相反，您需要getPath（）来获取db文件的路径。
答案 1 :(得分：0)
这个问题有点固定，它仍然存在，但我发现真正的问题在于使用自动适配TextView适配器在UI上显示数据，这在果冻Bean上不起作用。 所以我仍然得到'Failed to open database'异常，但无论如何都可以读取数据库。