Android SQLite更新/插入數據不會工作

Question

我想添加或更新Android中的SQLite數據庫中的信息。 數據庫獲取課程筆記ID和學生ID。如果課文標識爲0，則會創建一個新條目。

這裏是什麼在我的Dbhelper類（插入，更新是相當類似）：

public boolean insertLessonNotes(LessonNotesData lData) 
{ 
    SQLiteDatabase db = this.getWritableDatabase(); 
    ContentValues lessonValues = new ContentValues(); 
    //values.put(LESSON_ID, lData.getLessonID()); // Lesson ID 
    //values.put(ST_ID, lData.getStudentID()); // Student ID 
    //values.put(LESSON_IMAGE_ID, lData.getImageID()); // Lesson Image ID 
    //values.put(LESSON_IMAGE_NOTE, lData.getImageNote()); // Note attached to image 
    lessonValues.put(LESSON_ID, lData.getLessonID()); 
    lessonValues.put(ST_ID, lData.getStudentID()); 
    lessonValues.put(DATE, lData.getDate()); // Date note added 
    lessonValues.put(LESSON_READING, lData.getReadingNote()); // reading notes 
    lessonValues.put(LESSON_PHONICS, lData.getPhonicsNote()); // phoncis notes 
    lessonValues.put(LESSON_SPELLING, lData.getSpellingNote()); // spelling notes 
    lessonValues.put(LESSON_WRITING, lData.getWritingNote()); // writing notes 
    lessonValues.put(LESSON_COMMENTS, lData.getCommetns()); // comments notes 
    lessonValues.put(LESSON_HOMEWORK, lData.getHomework()); // homework notes 
    // Inserting Row 
    db.insert(TABLE_LESSON_NOTES, null, lessonValues); 
    db.close(); 
    return true; 
} 

這是我lessonNotes類（其中輸入和保存的信息）

LessonNotesData lNote = new LessonNotesData(id_To_Update, student_id, lessonDate.getText().toString(), readNote.getText().toString(), phonNote.getText().toString(), spellNote.getText().toString(), writeNote.getText().toString(), commentNote.getText().toString(), homeworkNote.getText().toString()); 
    Bundle extras = getIntent().getExtras(); 
    int studentID = extras.getInt("studentId"); 
    int lessonID = extras.getInt("lessonID"); 
    Toast.makeText(getApplicationContext(), "LessonID is:(lessonNotes3) "+String.valueOf(lessonID), Toast.LENGTH_SHORT).show(); 
    Toast.makeText(getApplicationContext(), "StudentID is: (lessonNotes3) "+String.valueOf(studentID), Toast.LENGTH_SHORT).show(); 
    //Bundle studentId = getIntent().getExtras(); 
    if (lessonID != 0) { 
     if (studentID > 0) { 
      if (mydb.updateLessonNotes(lNote)) { 
       //Update was successful 
       Toast.makeText(getApplicationContext(), "Updated successfully", Toast.LENGTH_SHORT).show(); 
       Intent intent = new Intent(getApplicationContext(), com.example.ltss.dyslexia.app.LessonNotesList.class); 
       intent.putExtra("studentId",studentID); 
       startActivity(intent); 
      } else { 
       //Update did not complete correctly 
       Toast.makeText(getApplicationContext(), "Update unsuccessful, Please try again", Toast.LENGTH_SHORT).show(); 
      } 
     } else { 

      if (mydb.insertLessonNotes(lNote)) { 
       Toast.makeText(getApplicationContext(), "New Lesson note created", Toast.LENGTH_SHORT).show(); 
      } else { 
       Toast.makeText(getApplicationContext(), "Error creating lesson note! Please try again", Toast.LENGTH_SHORT).show(); 
      } 
      //Return user to lessonNotesList where ListView should now show new lesson note 
      Intent intent = new Intent(getApplicationContext(), com.example.ltss.dyslexia.app.LessonNotesList.class); 
      intent.putExtra("studentId",studentID); 
      startActivity(intent); 
     } 
    } 

每當我嘗試添加或更新系統中的任何東西，我得到這個從調試日誌：

04-02 20:02:33.925 26789-26789/com.example.ltssdyslexiaapp D/Items to add:﹕ com.example.ltss.dyslexia.app.LessonNotesData@42602bf8 

關於這是什麼或我如何解決它的任何想法？

感謝

Answer 1

其實它不是在所有它只是一個Log輸出錯誤，它是一個DEBUG類型的日誌。你colud嘗試登錄相同的添加行android.util.Log.d（「hello」，「world」）;到任何你想要的方法。而'com.example.ltss.dyslexia.app.LessonNotesData@42602bf8'表示LessonNotesData沒有toString（）方法，這就是爲什麼你看到@ 42602bf8 - 它是一個在內存或散列中的實例地址。