Question

我尝试使用新值更新行，但行未更新。我在这里上了这堂课，我试着更新这行：

class EditListItemDialog extends Dialog implements View.OnClickListener {
    MyDB dba;
    private View editText;
    private DiaryAdapter adapter;
    private SQLiteDatabase db;

    public EditListItemDialog(Context context) {           
        super(context);
        dba = new MyDB(context);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.edit_text_dialog);//here is your xml with EditText and 'Ok' and 'Cancel' buttons
        View btnOk = findViewById(R.id.button_ok);
        editText = findViewById(R.id.edit_text);
        btnOk.setOnClickListener(this);

        dba.open();
    }

    private List<String> fragment_monday;
    private Object position;
    private long itemId;


    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        //Position is the number of the item clicked
        //You can use your adapter to modify the item
        long itemId = adapter.getItemId(position); //Will return the clicked item
        saveItToDB(itemId);
        }

    public EditListItemDialog(Context context, DiaryAdapter adapter, int position) {
        super(context);
        this.fragment_monday = new ArrayList<String>();
        this.adapter = adapter;
        dba = new MyDB(context);
    }

    @Override
    public void onClick(View v) {

        fragment_monday.add(((TextView) v).getText().toString());//here is your updated(or not updated) text
        // public void notifyDataSetChanged();
        dismiss();
        try {
            saveItToDB(itemId);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void saveItToDB(long itemId) {
        dba.open();
        dba.updateDiaryEntry(((TextView) editText).getText().toString(), itemId);
        dba.close();
        ((TextView) editText).setText("");
    }
}

在saveItToDB dba.updateDiaryEntry(text, itemId);中应该将行值更改为新值，其中itemId告诉它必须更新哪一行。它不起作用，我不知道如何解决问题。任何帮助，将不胜感激。感谢。

编辑---------------------------------------------- ----------------------------------

这是updateDiaryEntry代码：

public boolean updateDiaryEntry(String title, long rowId)
    {

        ContentValues newValue = new ContentValues();
        newValue.put(Constants.TITLE_NAME, title);

        return db.update(Constants.TABLE_NAME, newValue, Constants.KEY_ID + "=" + rowId, null)>0;

    }

我更改了EditListItemDialog类代码，我更新了onItemClick，saveItToDB，添加了private long itemId;并将itemId添加到了saveItToDB中的onClick。你可以验证我的代码是否有任何错误？不幸的是我仍然无法更新sql行。

Answer 1

替换

return db.update(Constants.TABLE_NAME, newValue, Constants.KEY_ID + "=" + rowId, null)>0;

与

return db.update(Constants.TABLE_NAME, newValue, Constants.KEY_ID + "= '" + rowId+"'", null)>0;

此外，您还需要确保没有将null或空String传递给方法

sql行没有得到更新

1 个答案: