python pyqt5 数据库_python3+PyQt5 数据库编程--增删改实例
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 python3
import os
import sys
from 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 = True
try:
from PyQt5.QtGui import qt_mac_set_native_menubar
except ImportError:
MAC = False
ID, 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龙方网络。