我的数据库有一个名为“tbl”的表，但错误提示:找不到表“tbl”
DataBase.java => 如下
public class DataBase extends SQLiteOpenHelper {
private Context context;
public DataBase(@Nullable Context context) {
super(context, info_db.Data_Name, null, info_db.DataBase_Version);
this.context = context;
IsDatabase();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
private void IsDatabase() {
File check = new File(info_db.Package);
if (!check.exists()) {
check.mkdir();
}
check = context.getDatabasePath(info_db.Data_Name);
if (!check.exists()) {
try {
copyDataBase();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void copyDataBase() throws IOException {
InputStream myInput = context.getAssets().open(info_db.DataBase_Source);
String outFileName = info_db.Package + info_db.DataBase_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 List<info_Data> fetchmaindata() {
SQLiteDatabase db = this.getReadableDatabase();
List<info_Data> data = new ArrayList<>();
String query ="SELECT "+info_db.Data_Name+","+info_db.Data_Body+","+info_db.Data_Fav+","+info_db.Data_Image+" FROM "+info_db.Table_Name;
Cursor cursor = db.rawQuery(query,null);
if (cursor.moveToFirst()){
do {
info_Data info = new info_Data();
info.setName(cursor.getString(cursor.getColumnIndex(info_db.Data_Name)));
info.setBody(cursor.getString(cursor.getColumnIndex(info_db.Data_Body)));
info.setFav(cursor.getInt(cursor.getColumnIndex(info_db.Data_Fav)));
info.setImage(cursor.getString(cursor.getColumnIndex(info_db.Data_Image)));
data.add(info);
}while (cursor.moveToNext());
}
cursor.close();
db.close();
return data;
}
}
FragMain.java => 如下
public class FragMain extends Fragment {
public FragMain() {
// Required empty public constructor
}
private RecyclerView recyclerView;
private AdapterMain adapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
DataBase db = new DataBase(getActivity());
List<info_Data> data = db.fetchmaindata();
db.close();
View view = inflater.inflate(R.layout.fragment_frag_main, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.main_re);
adapter = new AdapterMain(getActivity(), postdata(data));
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
return view;
}
private List<info> postdata(List<info_Data> db) {
List<info> data = new ArrayList<>();
//String name[] = {"بخش هشتم", "بخش هفتم", "بخش ششم", "بخش پنجم", "بخش چهارم", "بخش سوم", "بخش دوم"};
//int pic[] = {R.drawable.img, R.drawable.img, R.drawable.img, R.drawable.img, R.drawable.img, R.drawable.img, R.drawable.img};
for (int i = 0; i < db.size(); i++) {
info cur = new info();
cur.title = db.get(i).getName();
String uri ="@drawable/"+db.get(i).getImage();
int iconid = getResources().getIdentifier(uri, null, getActivity().getPackageName());
cur.iconid = iconid;
cur.body = db.get(i).getBody();
data.add(cur);
}
return data;
}
}
logcat => 中的错误如下
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.af.sawalebast/com.af.sawalebast.MainActivity}: android.view.InflateException: Binary XML file line #26: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2327)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.view.InflateException: Binary XML file line #26: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.af.sawalebast.MainActivity.onCreate(MainActivity.java:19)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.database.sqlite.SQLiteException: no such table: tbl (code 1): , while compiling: SELECT name,body,fav,image FROM tbl
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1316)
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1255)
**at com.af.sawalebast.DataBase.fetchmaindata(DataBase.java:74)
at com.af.sawalebast.FragMain.onCreateView(FragMain.java:33)**
at androidx.fragment.app.Fragment.performCreateView(Fragment.java:2600)
at androidx.fragment.app.FragmentManagerImpl.ensureInflatedFragmentView(FragmentManagerImpl.java:1138)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:851)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1133)
at androidx.fragment.app.FragmentManagerImpl.addFragment(FragmentManagerImpl.java:1393)
at androidx.fragment.app.FragmentManagerImpl.onCreateView(FragmentManagerImpl.java:3205)
at androidx.fragment.app.FragmentController.onCreateView(FragmentController.java:134)
at androidx.fragment.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:357)
at androidx.fragment.app.FragmentActivity.onCreateView(FragmentActivity.java:336)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:733)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:555)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:161)
at com.af.sawalebast.MainActivity.onCreate(MainActivity.java:19)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2392)
at android.app.ActivityThread.access$800(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1305)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5293)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
感谢大家
最佳答案
最有可能的原因是复制到 Assets 中的数据库文件没有这样的表。
我建议使用用于创建数据库文件的工具进行检查，以查看表名 tbl 是否存在。如果没有创建表并保存文件，然后关闭工具(重新启动工具并再次检查)，当确定表已创建时，替换 Assets 文件，并在卸载应用程序或删除应用程序的数据后重试。
作为临时措施，您可以使用以下代码:-
DataBase db = new DataBase(getActivity()); //<<<<< EXISTING CODE
Cursor csr = db.getWritableDatabase().query("sqlite_master",null,"name NOT like 'sqlite_%'",null,null,null);
DatabaseUtils.dumpCursor(csr);
csr.close();
List<info_Data> data = db.fetchmaindata(); //<<<<< EXISTING CODE
db.close(); //<<<<< EXISTING CODE
这将提取不是 SQLite 生成的所有数据库实体(表索引等)的列表，并将提取的数据转储到日志中。因此，您可以看到从 Assets 复制的数据库中存在哪些表。
关于java - RuntimeException - 由 : android. database.sqlite.SQLiteException 引起:没有这样的表:tbl(代码 1)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/59697249/