我在 https://doc.qt.io/qt-5/qtsql-relationaltablemodel-relationaltablemodel-cpp.html修改了关系表模型
我希望能够将我的更改保存到我的数据库中,但它只保存前两列,而不是主键查找行。另外,我无法删除行。我已经搜索过,但没有找到有关如何执行此操作的任何信息。我究竟做错了什么?
我使用的样本数据是:
CREATE TABLE `category` ( `Id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, `DrinkType` TEXT NOT NULL);
INSERT INTO `category` VALUES (1,'Non-alcoholic');
INSERT INTO `category` VALUES (2,'Alcoholic');
CREATE TABLE "drinks" ( `Id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, `Name` TEXT NOT NULL, `Type` INTEGER );
INSERT INTO `drinks` VALUES (1,'Coca Cola',1);
INSERT INTO `drinks` VALUES (2,'Pilsner',2);
我的代码:
def addRecord():
model.insertRow(model.rowCount())
def delRecord():
model.removeRow(view.currentIndex().row())
model.select()
app = QtWidgets.QApplication(sys.argv)
window = QtWidgets.QWidget()
window.setWindowTitle("QRelationalSqlTableModel")
con = QtSql.QSqlDatabase.addDatabase('QSQLITE')
con.setDatabaseName('drinks.db')
con.open()
model = QtSql.QSqlRelationalTableModel(parent = window)
model.setEditStrategy(QtSql.QSqlTableModel.OnManualSubmit)
model. setTable('drinks')
model.setRelation(2, QtSql.QSqlRelation('category', 'id', 'drinktype'))
model.select()
model.setHeaderData(1, QtCore.Qt.Horizontal, 'Name')
model.setHeaderData(3, QtCore.Qt.Horizontal, 'Type of drink')
vbox = QtWidgets.QVBoxLayout()
view = QtWidgets.QTableView()
view.setModel(model)
view.setItemDelegate(QtSql.QSqlRelationalDelegate(view))
view.hideColumn(0)
view.setColumnWidth(1, 150)
view.setColumnWidth(2, 150)
vbox.addWidget(view)
btnAdd = QtWidgets.QPushButton("&Add record")
btnAdd.clicked.connect(addRecord)
vbox.addWidget(btnAdd)
btnDel = QtWidgets.QPushButton("&Delete record")
btnDel.clicked.connect(delRecord)
vbox.addWidget(btnDel)
window.setLayout(vbox)
window.resize(430, 250)
window.show()
sys.exit(app.exec_())