MySQL Workbench提供了一个可视化的数据库表结构定义功能,但对下面这些列标志的含义有些模糊
查了一下这些标志的含义大致如下:
PK - Primary Key
NN - Not Null
UQ - Create/remove Unique Key
BIN - Binary
UN - Unsigned
ZF - Zero-Fill
第一个页<em>面的</em>代码:
public class MainActivity extends Activity {
private Button btn=null;
public void onCreate(Bundle savedInstanceState)//onCreate方法用来初始化Activity实例对象
tree = new QTreeWidget(this); this->setSelectionMode(QAbstractItemView::ExtendedSelection);tree->setColumnCount(2);this->setColumnWidth(0, 100); //设置列宽this->setColumnWidth(1, 300);
获取当前行的第n子行内容如下:
ui->treeWidget->->currentItem()-> child(n)->text(0) ;
QTreeWidgetItem * QTreeWidgetItem::child(int index) const
Returns the item at the given index in the list of the item'
#!/usr/bin/env python
import sys
from PyQt4.QtCore import SIGNAL
from PyQt4.QtGui import QApplication
from PyQt4.QtGui import QMainWindow
from PyQt4.QtGui import QTreeWidget
from PyQt4.QtGui import