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私のメモ用のデータベースを作成していますが、アプリケーションを実行するときにログキャットでエラーが発生します。そして、私は実際にnull、null、null、nullのnull部分を取得しません。 私も本当にのRuntimeExceptionエラーデータベースのjava.lang.RuntimeException
はここに私の活動ですされているものを理解していません：
package com.example.enxin.crystallise;
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;
import java.util.ArrayList;
import java.util.Calendar;
public class NotebookDbAdapter {
private static final String DATABASE_NAME = "notebook.db";
private static final int DATABASE_VERSION = 1;
public static final String NOTE_TABLE = "note";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_TITLE = "title";
public static final String COLUMN_MESSAGE = "message";
public static final String COLUMN_THOUGHTS = "thoughts";
public static final String COLUMN_CATEGORY = "category";
public static final String COLUMN_DATE = "date";
private String[] allColumns = { COLUMN_ID, COLUMN_TITLE, COLUMN_MESSAGE, COLUMN_THOUGHTS,
COLUMN_CATEGORY, COLUMN_DATE};
public static final String CREATE_TABLE_NOTE = "create table " + NOTE_TABLE + " ("
+ COLUMN_ID + " integer primary key autoincrement, "
+ COLUMN_TITLE + " text not null, "
+ COLUMN_MESSAGE + " text not null, "
+ COLUMN_THOUGHTS + " text not null, "
+ COLUMN_CATEGORY + " text not null, "
+ COLUMN_DATE + ");";
private SQLiteDatabase sqlDB;
private Context context;
private NotebookDbHelper notebookDbHelper;
public NotebookDbAdapter(Context ctx){
context = ctx;
}
public NotebookDbAdapter open() throws android.database.SQLException{
notebookDbHelper = new NotebookDbHelper(context);
sqlDB = notebookDbHelper.getWritableDatabase();
return this;
}
public void close(){
notebookDbHelper.close();
}
public Note createNote(String title, String message, String thoughts, Note.Category category){
ContentValues values = new ContentValues();
values.put(COLUMN_TITLE, title);
values.put(COLUMN_MESSAGE, message);
values.put(COLUMN_THOUGHTS, thoughts);
values.put(COLUMN_CATEGORY, category.name());
values.put(COLUMN_DATE, Calendar.getInstance().getTimeInMillis() + "");
long insertId = sqlDB.insert(NOTE_TABLE, null, values);
Cursor cursor = sqlDB.query(NOTE_TABLE,
allColumns, COLUMN_ID + " = " + insertId, null, null, null, null, null);
cursor.moveToFirst();
Note newnote = cursorToNote(cursor);
cursor.close();
return newnote;
}
public long deleteNote(long idToDelete){
return sqlDB.delete(NOTE_TABLE, COLUMN_ID + " = " + idToDelete, null);
}
public long updateNote(long idToUpdate, String newTitle, String newMessage, String newThoughts,
Note.Category newCategory){
ContentValues values = new ContentValues();
values.put(COLUMN_TITLE, newTitle);
values.put(COLUMN_MESSAGE, newMessage);
values.put(COLUMN_THOUGHTS, newThoughts);
values.put(COLUMN_CATEGORY, newCategory.name());
values.put(COLUMN_DATE, Calendar.getInstance().getTimeInMillis() + "");
return sqlDB.update(NOTE_TABLE, values, COLUMN_ID + " = " + idToUpdate, null);
}
public ArrayList<Note> getAllNotes(){
ArrayList<Note> notes = new ArrayList<Note>();
//grab all of the information in our database for the notes in it
Cursor cursor = sqlDB.query(NOTE_TABLE, allColumns, null, null, null, null, null);
for (cursor.moveToLast(); !cursor.isBeforeFirst(); cursor.moveToPrevious()){
Note note = cursorToNote(cursor);
notes.add(note);
}
cursor.close();
return notes;
}
private Note cursorToNote(Cursor cursor){
Note newNote = new Note (cursor.getString(1), cursor.getString(2),
Note.Category.valueOf(cursor.getString(3)), cursor.getLong(0), cursor.getLong(4));
return newNote;
}
private static class NotebookDbHelper extends SQLiteOpenHelper{
NotebookDbHelper(Context ctx){
super(ctx, DATABASE_NAME, null , DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db){
//create note table
db.execSQL(CREATE_TABLE_NOTE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
Log.w(NotebookDbHelper.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
//destroys data
db.execSQL("DROP TABLE IF EXISTS " + NOTE_TABLE);
onCreate(db);
}
}
}
そして、ここでは私のlogcatです：あなたには列が存在しないよう
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.enxin.crystallise/com.example.enxin.crystallise.MainActivity}: android.database.sqlite.SQLiteException: no such column: thoughts (code 1): , while compiling: SELECT _id, title, message, thoughts, category, date FROM note
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2184)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.database.sqlite.SQLiteException: no such column: thoughts (code 1): , while compiling: SELECT _id, title, message, thoughts, category, date FROM note
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:1314)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1161)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1032)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1200)
at com.example.enxin.crystallise.NotebookDbAdapter.getAllNotes(NotebookDbAdapter.java:98)
at com.example.enxin.crystallise.MainActivityListFragment.onActivityCreated(MainActivityListFragment.java:39)
at android.app.Fragment.performActivityCreated(Fragment.java:1708)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:908)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1044)
at android.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:1853)
at android.app.Activity.performCreate(Activity.java:5234)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
at android.app.ActivityThread.access$800(ActivityThread.java:135)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)