我在使用外部数据库时遇到问题。该数据库在大约 60% 的设备上运行良好，但例如在 Nexus 7 和 HTC 上，它会在 logcat 中引发“没有这样的表”错误。我很困惑如何处理它。但是我非常确定该表存在。它可以在我家里的设备上使用。
数据库助手类
public class DataBaseHelper extends SQLiteOpenHelper {
public static final String KEY_ID = "_id";
public static final String KEY_QUOTE = "quote";
public static final String KEY_AUTHOR = "author";
public static final String TABLE_QUOTES = "quotes";
public static final String KEY_FAV = "fav";
private static String DB_PATH = "/data/data/com.radoman.gameofthrones/databases/";
private final Context myContext;
private static String DB_NAME = "database.db";
private SQLiteDatabase myDataBase;
public DataBaseHelper(Context context) {
super(context, DB_NAME, null, 11 );
this.myContext = context;
}
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();
this.close();
try {
this.getReadableDatabase();
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase(){
File dbFile = new File(DB_PATH + DB_NAME);
return dbFile.exists();
}
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.OPEN_READWRITE);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
try {
createDataBase();
} catch (IOException e) {
Log.e("copy_db", "Error copying database");
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
//CRUD
public void addQuote(Quote quote)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_QUOTE, quote.getQuote());
values.put(KEY_AUTHOR, quote.getAuthor());
db.insert(TABLE_QUOTES, null, values);
db.close();
}
public Quote getQuote(int id)
{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_QUOTES, new String[] {KEY_ID,KEY_QUOTE,KEY_AUTHOR,KEY_FAV}, KEY_ID + "=?", new String[] { String.valueOf(id)}, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Quote quote = new Quote(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2), cursor.getInt(3));
return quote;
}
public List<Quote> getAllQuotes()
{
List<Quote> quoteList = new ArrayList<Quote>();
String selectQuery = "SELECT * FROM " + TABLE_QUOTES;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst())
{
do
{
Quote quote = new Quote();
quote.setID(Integer.parseInt(cursor.getString(0)));
quote.setQuote(cursor.getString(1));
quote.setAuthor(cursor.getString(2));
quoteList.add(quote);
} while(cursor.moveToNext());
}
return quoteList;
}
public int ifFav(int id)
{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_QUOTES, new String[] {KEY_ID,KEY_QUOTE,KEY_AUTHOR,KEY_FAV}, KEY_ID + "=?", new String[] { String.valueOf(id)}, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Quote quote = new Quote(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2), cursor.getInt(3));
if (quote.getFav() == 1)
{
db.close();
return 1;
}
else
{
db.close();
return 0;
}
}
public void addFav(int id)
{
SQLiteDatabase db = this.getWritableDatabase();
String query = "UPDATE quotes SET fav=1 WHERE _id=" +id;
db.execSQL(query);
db.close();
}
public void nullFav(int id)
{
SQLiteDatabase db = this.getWritableDatabase();
String query = "UPDATE quotes SET fav=0 WHERE _id=" +id;
db.execSQL(query);
db.close();
}
public List<HashMap<String, String>> getCharQuote(String character)
{
String selectQuery;
List<HashMap<String, String>> fillMaps = new ArrayList<HashMap<String, String>>();
if(character.equals("All quotes"))
{
selectQuery = "SELECT * FROM " + TABLE_QUOTES;
}
else if (character.equals("Other characters"))
{
selectQuery = "SELECT * FROM "+TABLE_QUOTES+
" WHERE author NOT IN('Syrio Forel','Ned Stark','Daenerys Targaryen'" +
",'Margaery Tyrell','Robert Baratheon','Tyrion Lannister','Ser Jorah Mormont','Bran Stark','Cersei Lannister','Jaime Lannister');";
}
else
{
selectQuery = "SELECT * FROM " + TABLE_QUOTES+" WHERE author='"+character+"'";
}
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst())
{
do
{
HashMap<String, String> map = new HashMap<String, String>();
map.put("quote", cursor.getString(2));
map.put("fav", cursor.getString(0));
map.put("id",cursor.getString(1));
fillMaps.add(map);
} while(cursor.moveToNext());
}
return fillMaps;
}
public List<HashMap<String, String>> getAllFavQuote()
{
List<HashMap<String, String>> fillMaps = new ArrayList<HashMap<String, String>>();
String selectQuery = "SELECT * FROM " + TABLE_QUOTES+" WHERE fav=1";
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst())
{
do
{
HashMap<String, String> map = new HashMap<String, String>();
map.put("quote", cursor.getString(2));
map.put("id", cursor.getString(1));
fillMaps.add(map);
} while(cursor.moveToNext());
}
return fillMaps;
}
}
和logcat错误：
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.radoman.gameofthrones/com.radoman.gameofthrones.FavQuotesActivity}: android.database.sqlite.SQLiteException: no such table: quotes (code 1): , while compiling: SELECT * FROM quotes WHERE fav=1
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: no such table: quotes (code 1): , while compiling: SELECT * FROM quotes WHERE fav=1
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1253)
at com.radoman.gameofthrones.DataBaseHelper.getAllFavQuote(DataBaseHelper.java:290)
at com.radoman.gameofthrones.FavQuotesActivity.onCreate(FavQuotesActivity.java:72)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
... 11 more