本文通过python3+pyqt5改写实现了python Qt gui 编程变成15章的excise例子。

#!/usr/bin/env python3import osimport sysfrom PyQt5.QtCore import (QFile, QVariant, Qt)from PyQt5.QtWidgets import (QApplication, QDialog, QDialogButtonBox, QMenu, QMessageBox, QTableView, QVBoxLayout)from PyQt5.QtSql import (QSqlDatabase, QSqlQuery, QSqlTableModel)MAC = Truetry: from PyQt5.QtGui import qt_mac_set_native_menubarexcept ImportError: MAC = FalseID, CATEGORY, SHORTDESC, LONGDESC = range(4)class ReferenceDataDlg(QDialog): def __init__(self, parent=None): super(ReferenceDataDlg, self).__init__(parent) self.model = QSqlTableModel(self) self.model.setTable("reference") self.model.setSort(ID, Qt.AscendingOrder) self.model.setHeaderData(ID, Qt.Horizontal, "ID") self.model.setHeaderData(CATEGORY, Qt.Horizontal,"Category") self.model.setHeaderData(SHORTDESC, Qt.Horizontal,"Short Desc.") self.model.setHeaderData(LONGDESC, Qt.Horizontal,"Long Desc.") self.model.select() self.view = QTableView() self.view.setModel(self.model) self.view.setSelectionMode(QTableView.SingleSelection) self.view.setSelectionBehavior(QTableView.SelectRows) self.view.setColumnHidden(ID, True) self.view.resizeColumnsToContents() buttonBox = QDialogButtonBox() addButton = buttonBox.addButton("&Add", QDialogButtonBox.ActionRole) deleteButton = buttonBox.addButton("&Delete", QDialogButtonBox.ActionRole) sortButton = buttonBox.addButton("&Sort", QDialogButtonBox.ActionRole) if not MAC: addButton.setFocusPolicy(Qt.NoFocus) deleteButton.setFocusPolicy(Qt.NoFocus) sortButton.setFocusPolicy(Qt.NoFocus) menu = QMenu(self) sortByCategoryAction = menu.addAction("Sort by &Category") sortByDescriptionAction = menu.addAction("Sort by &Description") sortByIDAction = menu.addAction("Sort by &ID") sortButton.setMenu(menu) closeButton = buttonBox.addButton(QDialogButtonBox.Close) layout = QVBoxLayout() layout.addWidget(self.view) layout.addWidget(buttonBox) self.setLayout(layout) addButton.clicked.connect(self.addRecord) deleteButton.clicked.connect(self.deleteRecord) sortByCategoryAction.triggered.connect(lambda:self.sort(CATEGORY)) sortByDescriptionAction.triggered.connect(lambda:self.sort(SHORTDESC)) sortByIDAction.triggered.connect(lambda:self.sort(ID)) closeButton.clicked.connect(self.accept) self.setWindowTitle("Reference Data") def addRecord(self): row = self.model.rowCount() self.model.insertRow(row) index = self.model.index(row, CATEGORY) self.view.setCurrentIndex(index) self.view.edit(index) def deleteRecord(self): index = self.view.currentIndex() if not index.isValid(): return record = self.model.record(index.row()) category = record.value(CATEGORY) desc = record.value(SHORTDESC) if (QMessageBox.question(self, "Reference Data", ("Delete {0} from category {1}?" .format(desc,category)), QMessageBox.Yes|QMessageBox.No) == QMessageBox.No): return self.model.removeRow(index.row()) self.model.submitAll() self.model.select() def sort(self, column): self.model.setSort(column, Qt.AscendingOrder) self.model.select()def main(): app = QApplication(sys.argv) filename = os.path.join(os.path.dirname(__file__), "reference.db") create = not QFile.exists(filename) db = QSqlDatabase.addDatabase("QSQLITE") db.setDatabaseName(filename) if not db.open(): QMessageBox.warning(None, "Reference Data", "Database Error: {0}".format(db.lastError().text())) sys.exit(1) if create: query = QSqlQuery() query.exec_("""CREATE TABLE reference ( id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL, category VARCHAR(30) NOT NULL, shortdesc VARCHAR(20) NOT NULL, longdesc VARCHAR(80))""") form = ReferenceDataDlg() form.show() sys.exit(app.exec_())main()

运行结果：

以上这篇python3+PyQt5 数据库编程--增删改实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。