问题
I have a database of information which I am trying to copy from assets into the application's database directory on the device. I have taken code from 1, but moved the copying code into the onCreate method of the DatabaseHelper class (as it calls it). The database copies without error, but then when I try to access data from it, I get an SQLiteException thrown, saying that the table does not exist. When I open the newly created database file up on my computer I can see that it is the correct size, but doesn't contain any table except from 'android_metadata'. If I manually copy the uncorrupted database file from my computer into the app's database directory then it functions properly, but obviously I can't just do this.
Here is the code that I use to open the database:
public ReferenceDatabaseAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getReadableDatabase();
return this;
}
Here is the onCreate method:
public void onCreate( SQLiteDatabase db )
{
Log.d("AutoBagger","onCreate called for reference database");
//Open your local db as the input stream
InputStream assetsDbFile;
try {
assetsDbFile = dHCtx.getAssets().open("reference.sqlite");
// Path to the just created empty db
String dbFile = "/data/data/" + dHCtx.getPackageName() + "/databases/"+DATABASE_NAME;
//Open the empty db as the output stream
OutputStream outputStream = new FileOutputStream(dbFile);
//transfer bytes from the assetsDbFile to the dbFile
byte[] buffer = new byte[1024];
int length;
while ((length = assetsDbFile.read(buffer))>0){
outputStream.write(buffer, 0, length);
}
//Close the streams
outputStream.flush();
outputStream.close();
assetsDbFile.close();
Log.d("AutoBagger","No errors whilst copying database");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d("AutoBagger","IOException encountered when copying database from assets");
}
}
On the first run I just get the error about the table not existing, butwhen I run it again (when the database has already been copied over) I get an SQLiteDatabaseCorruptionException "database disk image is malformed". Any ideas where I'm going wrong? Thanks.
LogCat output when database not already copied:
>07-08 17:16:41.490: D/AutoBagger(5145): DatabaseHelper constructor called (finished)
>07-08 17:16:41.530: D/AutoBagger(5145): onCreate called for reference database
>07-08 17:16:41.550: D/AutoBagger(5145): No errors whilst copying database
>07-08 17:16:41.550: D/AutoBagger(5145): fetchRows called
>07-08 17:16:41.550: I/Database(5145): sqlite returned: error code = 1, msg = no such table: hills
>07-08 17:16:41.550: D/AndroidRuntime(5145): Shutting down VM
>07-08 17:16:41.550: W/dalvikvm(5145): threadid=1: thread exiting with uncaught exception (group=0x402a7560)
>07-08 17:16:41.570: E/AndroidRuntime(5145): FATAL EXCEPTION: main
>07-08 17:16:41.570: E/AndroidRuntime(5145): android.database.sqlite.SQLiteException: no such table: hills: , while compiling: SELECT classification FROM hills WHERE dobihId = 1
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at com.s0812532.AutoBagger.ReferenceDatabaseAdapter.fetchRows(ReferenceDatabaseAdapter.java:196)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at com.s0812532.AutoBagger.Hill.isMunro(Hill.java:172)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at com.s0812532.AutoBagger.TestLauncher$12.onClick(TestLauncher.java:157)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.view.View.performClick(View.java:2501)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.view.View$PerformClick.run(View.java:9107)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.os.Handler.handleCallback(Handler.java:587)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.os.Handler.dispatchMessage(Handler.java:92)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.os.Looper.loop(Looper.java:130)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at android.app.ActivityThread.main(ActivityThread.java:3835)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at java.lang.reflect.Method.invokeNative(Native Method)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at java.lang.reflect.Method.invoke(Method.java:507)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
>07-08 17:16:41.570: E/AndroidRuntime(5145): at dalvik.system.NativeStart.main(Native Method)
>07-08 17:16:43.181: I/Process(5145): Sending signal. PID: 5145 SIG: 9
LogCat output when database has already been copied:
>07-08 17:11:43.669: D/AutoBagger(5136): DatabaseHelper constructor called (finished)
>07-08 17:11:43.669: I/Database(5136): sqlite returned: error code = 11, msg = database corruption at line 46139 of [42537b6056]
>07-08 17:11:43.669: I/Database(5136): sqlite returned: error code = 11, msg = statement aborts at 5: [SELECT locale FROM android_metadata LIMIT 1]
>07-08 17:11:43.669: E/Database(5136): SELECT locale FROM android_metadata failed
>07-08 17:11:43.679: E/Database(5136): Failed to setLocale() when constructing, closing the database
>07-08 17:11:43.679: E/Database(5136): android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:1987)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1855)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
>07-08 17:11:43.679: E/Database(5136): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:572)
>07-08 17:11:43.679: E/Database(5136): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
>07-08 17:11:43.679: E/Database(5136): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187)
>07-08 17:11:43.679: E/Database(5136): at com.s0812532.AutoBagger.ReferenceDatabaseAdapter.open(ReferenceDatabaseAdapter.java:145)
>07-08 17:11:43.679: E/Database(5136): at com.s0812532.AutoBagger.Hill.<init>(Hill.java:55)
>07-08 17:11:43.679: E/Database(5136): at com.s0812532.AutoBagger.TestLauncher$12.onClick(TestLauncher.java:156)
>07-08 17:11:43.679: E/Database(5136): at android.view.View.performClick(View.java:2501)
>07-08 17:11:43.679: E/Database(5136): at android.view.View$PerformClick.run(View.java:9107)
>07-08 17:11:43.679: E/Database(5136): at android.os.Handler.handleCallback(Handler.java:587)
>07-08 17:11:43.679: E/Database(5136): at android.os.Handler.dispatchMessage(Handler.java:92)
>07-08 17:11:43.679: E/Database(5136): at android.os.Looper.loop(Looper.java:130)
>07-08 17:11:43.679: E/Database(5136): at android.app.ActivityThread.main(ActivityThread.java:3835)
>07-08 17:11:43.679: E/Database(5136): at java.lang.reflect.Method.invokeNative(Native Method)
>07-08 17:11:43.679: E/Database(5136): at java.lang.reflect.Method.invoke(Method.java:507)
>07-08 17:11:43.679: E/Database(5136): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
>07-08 17:11:43.679: E/Database(5136): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
>07-08 17:11:43.679: E/Database(5136): at dalvik.system.NativeStart.main(Native Method)
>07-08 17:11:43.689: E/Database(5136): Deleting and re-creating corrupt database /data/data/com.s0812532.AutoBagger/databases/reference.sqlite
>07-08 17:11:43.689: E/Database(5136): android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:1987)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1855)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:854)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteDatabase.openOrCreateDatabase(SQLiteDatabase.java:847)
>07-08 17:11:43.689: E/Database(5136): at android.app.ContextImpl.openOrCreateDatabase(ContextImpl.java:572)
>07-08 17:11:43.689: E/Database(5136): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:118)
>07-08 17:11:43.689: E/Database(5136): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:187)
>07-08 17:11:43.689: E/Database(5136): at com.s0812532.AutoBagger.ReferenceDatabaseAdapter.open(ReferenceDatabaseAdapter.java:145)
>07-08 17:11:43.689: E/Database(5136): at com.s0812532.AutoBagger.Hill.<init>(Hill.java:55)
>07-08 17:11:43.689: E/Database(5136): at com.s0812532.AutoBagger.TestLauncher$12.onClick(TestLauncher.java:156)
>07-08 17:11:43.689: E/Database(5136): at android.view.View.performClick(View.java:2501)
>07-08 17:11:43.689: E/Database(5136): at android.view.View$PerformClick.run(View.java:9107)
>07-08 17:11:43.689: E/Database(5136): at android.os.Handler.handleCallback(Handler.java:587)
>07-08 17:11:43.689: E/Database(5136): at android.os.Handler.dispatchMessage(Handler.java:92)
>07-08 17:11:43.689: E/Database(5136): at android.os.Looper.loop(Looper.java:130)
>07-08 17:11:43.689: E/Database(5136): at android.app.ActivityThread.main(ActivityThread.java:3835)
>07-08 17:11:43.689: E/Database(5136): at java.lang.reflect.Method.invokeNative(Native Method)
>07-08 17:11:43.689: E/Database(5136): at java.lang.reflect.Method.invoke(Method.java:507)
>07-08 17:11:43.689: E/Database(5136): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
>07-08 17:11:43.689: E/Database(5136): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
>07-08 17:11:43.689: E/Database(5136): at dalvik.system.NativeStart.main(Native Method)
>07-08 17:11:43.709: D/AutoBagger(5136): onCreate called for reference database
>07-08 17:11:43.719: D/AutoBagger(5136): No errors whilst copying database
>07-08 17:11:43.729: D/AutoBagger(5136): fetchRows called
>07-08 17:11:43.729: I/Database(5136): sqlite returned: error code = 1, msg = no such table: hills
>07-08 17:11:43.729: D/AndroidRuntime(5136): Shutting down VM
>07-08 17:11:43.729: W/dalvikvm(5136): threadid=1: thread exiting with uncaught exception (group=0x402a7560)
>07-08 17:11:43.739: E/AndroidRuntime(5136): FATAL EXCEPTION: main
>07-08 17:11:43.739: E/AndroidRuntime(5136): android.database.sqlite.SQLiteException: no such table: hills: , while compiling: SELECT classification FROM hills WHERE dobihId = 1
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at com.s0812532.AutoBagger.ReferenceDatabaseAdapter.fetchRows(ReferenceDatabaseAdapter.java:196)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at com.s0812532.AutoBagger.Hill.isMunro(Hill.java:172)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at com.s0812532.AutoBagger.TestLauncher$12.onClick(TestLauncher.java:157)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.view.View.performClick(View.java:2501)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.view.View$PerformClick.run(View.java:9107)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.os.Handler.handleCallback(Handler.java:587)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.os.Handler.dispatchMessage(Handler.java:92)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.os.Looper.loop(Looper.java:130)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at android.app.ActivityThread.main(ActivityThread.java:3835)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at java.lang.reflect.Method.invokeNative(Native Method)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at java.lang.reflect.Method.invoke(Method.java:507)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
>07-08 17:11:43.739: E/AndroidRuntime(5136): at dalvik.system.NativeStart.main(Native Method)
>07-08 17:11:45.461: I/Process(5136): Sending signal. PID: 5136 SIG: 9
回答1:
Try this pattern:
public class DatabaseHelper extends SQLiteOpenHelper{
private static String PKG_NAME = "name_of_package_for_apk";
private static String DB_PATH = "/data/data/" + PKG_NAME + "/databases/";
private static String DB_NAME = "db.db3";
private SQLiteDatabase myDataBase;
private final Context myContext;
DatabaseHelper(Context context)
{
super(context, DB_NAME, null, 1);
this.myContext = context;
}
@Override
public void onCreate(SQLiteDatabase db) { }
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if (!dbExist){
getReadableDatabase();
copyDatabase();
}else{
this.close();
}
}
private boolean checkDataBase(){
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH + DB_NAME;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY|SQLiteDatabase.NO_LOCALIZED_COLLATORS);
}catch(SQLiteException e){
//database does't exist yet.
Log.v(TAG, "[checkDataBase] - Database does not exist... YET!");
}finally{
if(checkDB != null) checkDB.close();
}
return (checkDB != null) ? true : false;
}
private void copyDataBase() throws IOException{
boolean bCopyOk = false;
try{
//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();
bCopyOk = true;
}catch(Exception ex){
}finally{
if (bCopyOk) Log.v(TAG, "[copyDataBase] - Database copied OK!");
}
}
@SuppressWarnings("unused")
public void openDataBase() throws SQLException{
//Open the database
String myPath = DB_PATH + DB_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null) myDataBase.close();
super.close();
}
}
Simply, do this:
dbHelper = new DatabaseHelper(getApplicationContext());
dbHelper.createDatabase();
Edit: It transpires that the metadata is missing this vital entry, by using the Sqliteman's GUI front end, and using this script
CREATE TABLE "android_metadata" ("locale" TEXT DEFAULT 'en_US')
The clue was in the logcat itself:
>07-08 17:11:43.669: E/Database(5136): SELECT locale FROM android_metadata failed
>07-08 17:11:43.679: E/Database(5136): Failed to setLocale() when constructing, closing the database
>07-08 17:11:43.679: E/Database(5136): android.database.sqlite.SQLiteDatabaseCorruptException: database disk image is malformed
来源：https://stackoverflow.com/questions/11384617/database-being-corrupted-when-copying-from-assets