在我告诉我一个我的专栏不存在的地方突然出现错误。此列存在于我的数据库的Contract类中，但出于某种原因，光标无法识别。
logcat的
03-16 16:37:29.029 8240-8240/com.compscitutorials.basigarcia.ramfernoscout E/SQLiteLog: (1) no such column: TEAM_NUMBER
03-16 16:37:29.030 8240-8240/com.compscitutorials.basigarcia.ramfernoscout D/AndroidRuntime: Shutting down VM
03-16 16:37:29.030 8240-8240/com.compscitutorials.basigarcia.ramfernoscout E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.compscitutorials.basigarcia.ramfernoscout, PID: 8240
android.database.sqlite.SQLiteException: no such column: TEAM_NUMBER (code 1): , while compiling: SELECT TEAM_NUMBER, PORTCULLIS, CHEVAL_DE_FRISE, MOAT, RAMPARTS, DRAWBRIDGE, SALLY_PORT, ROCK_WALL, ROCK_TERRAIN, LOW_BAR FROM scout_table
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498)
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.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at com.compscitutorials.basigarcia.ramfernoscout.DatabaseHelper.getInformation(DatabaseHelper.java:63)
at com.compscitutorials.basigarcia.ramfernoscout.ScoutFragment.onCreateView(ScoutFragment.java:40)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1974)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:517)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
DatabaseHelper.java
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "Scout.db";
private static final int DATABASE_VERSION = 1;
private static final String CREATE_QUERY = "CREATE TABLE " + DatabaseContract.NewDataInfo.TABLE_NAME + "(" + DatabaseContract.NewDataInfo.COL_NUMBER +
" INTEGER," + DatabaseContract.NewDataInfo.COL_PORTCULLIS + " TEXT," + DatabaseContract.NewDataInfo.COL_CHEVAL_FRISE + " TEXT," +
DatabaseContract.NewDataInfo.COL_MOAT + " TEXT," + DatabaseContract.NewDataInfo.COL_RAMPARTS + " TEXT," + DatabaseContract.NewDataInfo.COL_DRAWBRIDGE +
" TEXT," + DatabaseContract.NewDataInfo.COL_SALLY_PORT + " TEXT," + DatabaseContract.NewDataInfo.COL_ROCK_WALL + " TEXT," +
DatabaseContract.NewDataInfo.COL_ROCK_TERRAIN + " TEXT," + DatabaseContract.NewDataInfo.COL_LOW_BAR + " TEXT);";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
Log.e("DATABASE OPERATIONS", "Database created / opened ...");
} //End of DatabaseHelper
@Override
public void onCreate(SQLiteDatabase db) {
//Create Query
db.execSQL(CREATE_QUERY);
//Display Log message
Log.e("DATABASE OPERATIONS", "Table created...");
} //End of onCreate
public void addInformation(String eNumber, String ePoticullis, String eChevalFrise, String eMoat, String eRamparts, String eDrawbridge, String eSallyPort,
String eRockWall, String eRockTerrain, String eLowBar, SQLiteDatabase db) {
//Instantiate contentValues
ContentValues contentValues = new ContentValues();
//Insert all content values
contentValues.put(DatabaseContract.NewDataInfo.COL_NUMBER, eNumber);
contentValues.put(DatabaseContract.NewDataInfo.COL_PORTCULLIS, ePoticullis);
contentValues.put(DatabaseContract.NewDataInfo.COL_CHEVAL_FRISE, eChevalFrise);
contentValues.put(DatabaseContract.NewDataInfo.COL_MOAT, eMoat);
contentValues.put(DatabaseContract.NewDataInfo.COL_RAMPARTS, eRamparts);
contentValues.put(DatabaseContract.NewDataInfo.COL_DRAWBRIDGE, eDrawbridge);
contentValues.put(DatabaseContract.NewDataInfo.COL_SALLY_PORT, eSallyPort);
contentValues.put(DatabaseContract.NewDataInfo.COL_ROCK_WALL, eRockWall);
contentValues.put(DatabaseContract.NewDataInfo.COL_ROCK_TERRAIN, eRockTerrain);
contentValues.put(DatabaseContract.NewDataInfo.COL_LOW_BAR, eLowBar);
//Insert content values into table
db.insert(DatabaseContract.NewDataInfo.TABLE_NAME, null, contentValues);
//Display log message
Log.e("DATABASE OPERATIONS", "One row inserted...");
} //End of addInformation
public Cursor getInformation(SQLiteDatabase db){
Cursor cursor;
String[] projections = {DatabaseContract.NewDataInfo.COL_NUMBER, DatabaseContract.NewDataInfo.COL_PORTCULLIS,
DatabaseContract.NewDataInfo.COL_CHEVAL_FRISE, DatabaseContract.NewDataInfo.COL_MOAT,DatabaseContract.NewDataInfo.COL_RAMPARTS,
DatabaseContract.NewDataInfo.COL_DRAWBRIDGE, DatabaseContract.NewDataInfo.COL_SALLY_PORT, DatabaseContract.NewDataInfo.COL_ROCK_WALL,
DatabaseContract.NewDataInfo.COL_ROCK_TERRAIN, DatabaseContract.NewDataInfo.COL_LOW_BAR};
cursor = db.query(DatabaseContract.NewDataInfo.TABLE_NAME, projections, null, null, null, null, null);
return cursor;
} //End of getInformation
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
} //End of onUpgrade
} //End of class
ScoutFragment.java
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Color;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
/**
* A simple {@link Fragment} subclass.
*/
public class ScoutFragment extends Fragment {
FloatingActionButton addDataScout;
ListView eListScoutInfo;
SQLiteDatabase sqLiteDatabase;
DatabaseHelper databaseHelper;
Cursor cursor;
ListScoutInfoAdapter listScoutInfoAdapter;
public ScoutFragment() {
// Required empty public constructor
} //End of ScoutFragment
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_scout, null, false);
view.setBackgroundColor(Color.WHITE);
eListScoutInfo = (ListView) view.findViewById(R.id.listScoutInfo);
listScoutInfoAdapter = new ListScoutInfoAdapter(getActivity().getApplicationContext(), R.layout.row_layout);
eListScoutInfo.setAdapter(listScoutInfoAdapter);
databaseHelper = new DatabaseHelper(getActivity().getApplicationContext());
sqLiteDatabase = databaseHelper.getReadableDatabase();
cursor = databaseHelper.getInformation(sqLiteDatabase);
//Checks if information is available in cursor
if(cursor.moveToFirst()){
do {
//Delcare all strings
String teamNumber, portcullis, chevalFrise, moat, ramparts, drawbridge, sallyPort, rockWall, rockTerrain, lowBar;
//Get strings from cursor
teamNumber = cursor.getString(0);
portcullis = cursor.getString(1);
chevalFrise = cursor.getString(2);
moat = cursor.getString(3);
ramparts = cursor.getString(4);
drawbridge = cursor.getString(5);
sallyPort = cursor.getString(6);
rockWall = cursor.getString(7);
rockTerrain = cursor.getString(8);
lowBar = cursor.getString(9);
//Get methods from DatabaseProvider
DatabaseProvider databaseProvider = new DatabaseProvider(teamNumber, portcullis, chevalFrise, moat, ramparts,
drawbridge, sallyPort, rockWall, rockTerrain, lowBar);
//Pass objects to add method
listScoutInfoAdapter.add(databaseProvider);
} while (cursor.moveToNext());
} //End of if statement
//Setups Floating Action Button
addDataScout = (FloatingActionButton) view.findViewById(R.id.fab);
addDataScout.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
AddScoutDataFragment fragment = new AddScoutDataFragment();
FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left, R.anim.enter_from_left, R.anim.exit_to_right);
fragmentTransaction.replace(R.id.fragment_container, fragment);
fragmentTransaction.commit();
} //End of onClick
}); //End of setOnClickListener
return view;
} //End of onCreateView
} //End of class
DatabaseContract.java
public class DatabaseContract {
public static abstract class NewDataInfo {
public static final String TABLE_NAME = "scout_table";
public static final String COL_NUMBER = "TEAM_NUMBER";
public static final String COL_PORTCULLIS = "PORTCULLIS";
public static final String COL_CHEVAL_FRISE = "CHEVAL_DE_FRISE";
public static final String COL_MOAT = "MOAT";
public static final String COL_RAMPARTS = "RAMPARTS";
public static final String COL_DRAWBRIDGE = "DRAWBRIDGE";
public static final String COL_SALLY_PORT = "SALLY_PORT";
public static final String COL_ROCK_WALL = "ROCK_WALL";
public static final String COL_ROCK_TERRAIN = "ROCK_TERRAIN";
public static final String COL_LOW_BAR = "LOW_BAR";
} //End of NewDataInfo
} //End of class
答案 0 :(得分：2)
如上所述，如果应用数据在没有此列之前创建数据库时仍应处于开发状态，则应清除应用数据，如果它在生产阶段，则应在OnUpgrad方法中进行此类升级。