Question

我正在尝试在Android中的SQLite数据库中添加或更新信息。数据库采用课程注释ID和学生ID。如果课程注释id为0，则表示正在创建新条目。

这是我的Dbhelper类中的内容（对于插入，更新非常相似）：

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;
}

这是我的lessonNotes类（输入和保存信息的地方）

    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);
        }
    }

每当我尝试在系统中添加或更新任何内容时，我都会从调试日志中获取：

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

关于这是什么或如何解决它的任何想法？

谢谢

Answer 1

实际上它不是一个错误，只是一个Log输出，它是一个DEBUG类型的Log。你colud尝试记录相同的添加行android.util.Log.d（＆＃34; hello＆＃34;，＆＃34; world＆＃34;）;你想要的任何方法。并且＆＃39; com.example.ltss.dyslexia.app.LessonNotesData@42602bf8'表示LessonNotesData没有toString（）方法，这就是为什么你看到@ 42602bf8 - 它在内存或散列中的实例地址。

Android SQLite更新/插入数据将无法正常工作

1 个答案: