如何刷新代表 QSqlRelationalTablemodel 数据的组合框委托中的项目列表
How to refresh the list of items in the combobox delegate which represents the data of a QSqlRelationalTablemodel
我最近研究了 Mark Summerfield 的“使用 Python 和 Qt 进行快速 GUI 编程”第 15 章中的一个示例，该示例介绍了 SQL 数据库 TableView 建模的使用。在这个原始示例中，我发现了一些功能障碍，它会阻止 table 视图刷新组合框委托（即 QSqlRelation）。简单地说，代表 QSqlRelationalTableModel 数据的 table 视图中的组合框委托在关系 table 被修改后不会更新。
原文件名为chap15/assetmanager.pyw，可以找到elsewhere。下面我提供了重现该问题所需的代码片段。
在此示例中，为操作和类别 (QSqlRelationalTableModel) 建立了与 QSqlTableModel（self.assetModel 和 self.logModel）的关系，可以使用组合框委托（LogDelegate 或 AssetDelegate）对其进行修改。可以通过 ReferenceDataDlg 对话框添加新的操作或类别。
类别中添加了新记录
但是，一旦 ReferenceDataDlg 对话框关闭，即使新记录存在于 SQL table 中用于操作或类别，新创建的记录也不会出现在组合框委托中。
组合框委托未刷新
如何以编程方式刷新 table 视图中组合框委托中的项目列表：self.assetView 和 self.logView？
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from future_builtins import *
import os
import sys
from PyQt4.QtCore import (PYQT_VERSION_STR, QDate, QFile, QRegExp,
QString, QVariant, Qt, SIGNAL)
from PyQt4.QtGui import (QApplication, QCursor, QDateEdit, QDialog,
QHBoxLayout, QLabel, QLineEdit, QMessageBox, QPixmap,
QPushButton, QRegExpValidator, QStyleOptionViewItem, QTableView,
QVBoxLayout)
from PyQt4.QtSql import (QSqlDatabase, QSqlQuery, QSqlRelation,
QSqlRelationalDelegate, QSqlRelationalTableModel, QSqlTableModel)
MAC = True
try:
from PyQt4.QtGui import qt_mac_set_native_menubar
except ImportError:
MAC = False
ID = 0
NAME = ASSETID = 1
CATEGORYID = DATE = DESCRIPTION = 2
ROOM = ACTIONID = 3
ACQUIRED = 1
def createFakeData():
import random
print("Dropping tables...")
query = QSqlQuery()
query.exec_("DROP TABLE assets")
query.exec_("DROP TABLE logs")
query.exec_("DROP TABLE actions")
query.exec_("DROP TABLE categories")
QApplication.processEvents()
print("Creating tables...")
query.exec_("""CREATE TABLE actions (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
name VARCHAR(20) NOT NULL,
description VARCHAR(40) NOT NULL)""")
query.exec_("""CREATE TABLE categories (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
name VARCHAR(20) NOT NULL,
description VARCHAR(40) NOT NULL)""")
query.exec_("""CREATE TABLE assets (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
name VARCHAR(40) NOT NULL,
categoryid INTEGER NOT NULL,
room VARCHAR(4) NOT NULL,
FOREIGN KEY (categoryid) REFERENCES categories)""")
query.exec_("""CREATE TABLE logs (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
assetid INTEGER NOT NULL,
date DATE NOT NULL,
actionid INTEGER NOT NULL,
FOREIGN KEY (assetid) REFERENCES assets,
FOREIGN KEY (actionid) REFERENCES actions)""")
QApplication.processEvents()
print("Populating tables...")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Acquired', 'When installed')")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Broken', 'When failed and unusable')")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Repaired', 'When back in service')")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Routine maintenance', "
"'When tested, refilled, etc.')")
query.exec_("INSERT INTO categories (name, description) VALUES "
"('Computer Equipment', "
"'Monitors, System Units, Peripherals, etc.')")
query.exec_("INSERT INTO categories (name, description) VALUES "
"('Furniture', 'Chairs, Tables, Desks, etc.')")
query.exec_("INSERT INTO categories (name, description) VALUES "
"('Electrical Equipment', 'Non-computer electricals')")
today = QDate.currentDate()
floors = range(1, 12) + range(14, 28)
monitors = (('17" LCD Monitor', 1),
('20" LCD Monitor', 1),
('21" LCD Monitor', 1),
('21" CRT Monitor', 1),
('24" CRT Monitor', 1))
computers = (("Computer (32-bit/80GB/0.5GB)", 1),
("Computer (32-bit/100GB/1GB)", 1),
("Computer (32-bit/120GB/1GB)", 1),
("Computer (64-bit/240GB/2GB)", 1),
("Computer (64-bit/320GB/4GB)", 1))
printers = (("Laser Printer (4 ppm)", 1),
("Laser Printer (6 ppm)", 1),
("Laser Printer (8 ppm)", 1),
("Laser Printer (16 ppm)", 1))
chairs = (("Secretary Chair", 2),
("Executive Chair (Basic)", 2),
("Executive Chair (Ergonimic)", 2),
("Executive Chair (Hi-Tech)", 2))
desks = (("Desk (Basic, 3 drawer)", 2),
("Desk (Standard, 3 drawer)", 2),
("Desk (Executive, 3 drawer)", 2),
("Desk (Executive, 4 drawer)", 2),
("Desk (Large, 4 drawer)", 2))
furniture = (("Filing Cabinet (3 drawer)", 2),
("Filing Cabinet (4 drawer)", 2),
("Filing Cabinet (5 drawer)", 2),
("Bookcase (4 shelves)", 2),
("Bookcase (6 shelves)", 2),
("Table (4 seater)", 2),
("Table (8 seater)", 2),
("Table (12 seater)", 2))
electrical = (("Fan (3 speed)", 3),
("Fan (5 speed)", 3),
("Photocopier (4 ppm)", 3),
("Photocopier (6 ppm)", 3),
("Photocopier (8 ppm)", 3),
("Shredder", 3))
query.prepare("INSERT INTO assets (name, categoryid, room) "
"VALUES (:name, :categoryid, :room)")
logQuery = QSqlQuery()
logQuery.prepare("INSERT INTO logs (assetid, date, actionid) "
"VALUES (:assetid, :date, :actionid)")
assetid = 1
for i in range(20):
room = QVariant("{0:02d}{1:02d}".format(
random.choice(floors), random.randint(1, 62)))
for name, category in (random.choice(monitors),
random.choice(computers), random.choice(chairs),
random.choice(desks), random.choice(furniture)):
query.bindValue(":name", QVariant(name))
query.bindValue(":categoryid", QVariant(category))
query.bindValue(":room", room)
query.exec_()
logQuery.bindValue(":assetid", QVariant(assetid))
when = today.addDays(-random.randint(7, 1500))
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid", QVariant(ACQUIRED))
logQuery.exec_()
if random.random() > 0.7:
logQuery.bindValue(":assetid", QVariant(assetid))
when = when.addDays(random.randint(1, 1500))
if when <= today:
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid",
QVariant(random.choice((2, 4))))
logQuery.exec_()
assetid += 1
if random.random() > 0.8:
name, category = random.choice(printers)
query.bindValue(":name", QVariant(name))
query.bindValue(":categoryid", QVariant(category))
query.bindValue(":room", room)
query.exec_()
logQuery.bindValue(":assetid", QVariant(assetid))
when = today.addDays(-random.randint(7, 1500))
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid", QVariant(ACQUIRED))
logQuery.exec_()
if random.random() > 0.6:
logQuery.bindValue(":assetid", QVariant(assetid))
when = when.addDays(random.randint(1, 1500))
if when <= today:
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid",
QVariant(random.choice((2, 4))))
logQuery.exec_()
assetid += 1
if random.random() > 0.6:
name, category = random.choice(electrical)
query.bindValue(":name", QVariant(name))
query.bindValue(":categoryid", QVariant(category))
query.bindValue(":room", room)
query.exec_()
logQuery.bindValue(":assetid", QVariant(assetid))
when = today.addDays(-random.randint(7, 1500))
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid", QVariant(ACQUIRED))
logQuery.exec_()
if random.random() > 0.5:
logQuery.bindValue(":assetid", QVariant(assetid))
when = when.addDays(random.randint(1, 1500))
if when <= today:
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid",
QVariant(random.choice((2, 4))))
logQuery.exec_()
assetid += 1
QApplication.processEvents()
print("Assets:")
query.exec_("SELECT id, name, categoryid, room FROM assets "
"ORDER by id")
categoryQuery = QSqlQuery()
while query.next():
id = query.value(0).toInt()[0]
name = unicode(query.value(1).toString())
categoryid = query.value(2).toInt()[0]
room = unicode(query.value(3).toString())
categoryQuery.exec_(QString("SELECT name FROM categories "
"WHERE id = %1").arg(categoryid))
category = "{0}".format(categoryid)
if categoryQuery.next():
category = unicode(categoryQuery.value(0).toString())
print("{0}: {1} [{2}] {3}".format(id, name, category, room))
QApplication.processEvents()
class ReferenceDataDlg(QDialog):
def __init__(self, table, title, parent=None):
super(ReferenceDataDlg, self).__init__(parent)
self.model = QSqlTableModel(self)
self.model.setTable(table)
self.model.setSort(NAME, Qt.AscendingOrder)
self.model.setHeaderData(ID, Qt.Horizontal, QVariant("ID"))
self.model.setHeaderData(NAME, Qt.Horizontal, QVariant("Name"))
self.model.setHeaderData(DESCRIPTION, Qt.Horizontal,
QVariant("Description"))
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()
addButton = QPushButton("&Add")
deleteButton = QPushButton("&Delete")
okButton = QPushButton("&OK")
if not MAC:
addButton.setFocusPolicy(Qt.NoFocus)
deleteButton.setFocusPolicy(Qt.NoFocus)
buttonLayout = QHBoxLayout()
buttonLayout.addWidget(addButton)
buttonLayout.addWidget(deleteButton)
buttonLayout.addStretch()
buttonLayout.addWidget(okButton)
layout = QVBoxLayout()
layout.addWidget(self.view)
layout.addLayout(buttonLayout)
self.setLayout(layout)
self.connect(addButton, SIGNAL("clicked()"), self.addRecord)
self.connect(okButton, SIGNAL("clicked()"), self.accept)
self.setWindowTitle(
"Asset Manager - Edit {0} Reference Data".format(title))
def addRecord(self):
row = self.model.rowCount()
self.model.insertRow(row)
index = self.model.index(row, NAME)
self.view.setCurrentIndex(index)
self.view.edit(index)
class AssetDelegate(QSqlRelationalDelegate):
def __init__(self, parent=None):
super(AssetDelegate, self).__init__(parent)
def paint(self, painter, option, index):
myoption = QStyleOptionViewItem(option)
if index.column() == ROOM:
myoption.displayAlignment |= (Qt.AlignRight|Qt.AlignVCenter)
QSqlRelationalDelegate.paint(self, painter, myoption, index)
def createEditor(self, parent, option, index):
if index.column() == ROOM:
editor = QLineEdit(parent)
regex = QRegExp(r"(?:0[1-9]|1[0124-9]|2[0-7])"
r"(?:0[1-9]|[1-5][0-9]|6[012])")
validator = QRegExpValidator(regex, parent)
editor.setValidator(validator)
editor.setInputMask("9999")
editor.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
return editor
else:
return QSqlRelationalDelegate.createEditor(self, parent,
option, index)
def setEditorData(self, editor, index):
if index.column() == ROOM:
text = index.model().data(index, Qt.DisplayRole).toString()
editor.setText(text)
else:
QSqlRelationalDelegate.setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
if index.column() == ROOM:
model.setData(index, QVariant(editor.text()))
else:
QSqlRelationalDelegate.setModelData(self, editor, model,
index)
class LogDelegate(QSqlRelationalDelegate):
def __init__(self, parent=None):
super(LogDelegate, self).__init__(parent)
def paint(self, painter, option, index):
myoption = QStyleOptionViewItem(option)
if index.column() == DATE:
myoption.displayAlignment |= (Qt.AlignRight|Qt.AlignVCenter)
QSqlRelationalDelegate.paint(self, painter, myoption, index)
def createEditor(self, parent, option, index):
if (index.column() == ACTIONID and
index.model().data(index, Qt.DisplayRole).toInt()[0] ==
ACQUIRED): # Acquired is read-only
return
if index.column() == DATE:
editor = QDateEdit(parent)
editor.setMaximumDate(QDate.currentDate())
editor.setDisplayFormat("yyyy-MM-dd")
if PYQT_VERSION_STR >= "4.1.0":
editor.setCalendarPopup(True)
editor.setAlignment(Qt.AlignRight|
Qt.AlignVCenter)
return editor
else:
return QSqlRelationalDelegate.createEditor(self, parent,
option, index)
def setEditorData(self, editor, index):
if index.column() == DATE:
date = index.model().data(index, Qt.DisplayRole).toDate()
editor.setDate(date)
else:
QSqlRelationalDelegate.setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
if index.column() == DATE:
model.setData(index, QVariant(editor.date()))
else:
QSqlRelationalDelegate.setModelData(self, editor, model,
index)
class MainForm(QDialog):
def __init__(self):
super(MainForm, self).__init__()
self.assetModel = QSqlRelationalTableModel(self)
self.assetModel.setTable("assets")
self.assetModel.setRelation(CATEGORYID,
QSqlRelation("categories", "id", "name"))
self.assetModel.setSort(ROOM, Qt.AscendingOrder)
self.assetModel.setHeaderData(ID, Qt.Horizontal, QVariant("ID"))
self.assetModel.setHeaderData(NAME, Qt.Horizontal,
QVariant("Name"))
self.assetModel.setHeaderData(CATEGORYID, Qt.Horizontal,
QVariant("Category"))
self.assetModel.setHeaderData(ROOM, Qt.Horizontal,
QVariant("Room"))
self.assetModel.select()
self.assetView = QTableView()
self.assetView.setModel(self.assetModel)
self.assetView.setItemDelegate(AssetDelegate(self))
self.assetView.setSelectionMode(QTableView.SingleSelection)
self.assetView.setSelectionBehavior(QTableView.SelectRows)
self.assetView.setColumnHidden(ID, True)
self.assetView.resizeColumnsToContents()
assetLabel = QLabel("A&ssets")
assetLabel.setBuddy(self.assetView)
self.logModel = QSqlRelationalTableModel(self)
self.logModel.setTable("logs")
self.logModel.setRelation(ACTIONID,
QSqlRelation("actions", "id", "name"))
self.logModel.setSort(DATE, Qt.AscendingOrder)
self.logModel.setHeaderData(DATE, Qt.Horizontal, QVariant("Date"))
self.logModel.setHeaderData(ACTIONID, Qt.Horizontal,
QVariant("Action"))
self.logModel.select()
self.logView = QTableView()
self.logView.setModel(self.logModel)
self.logView.setItemDelegate(LogDelegate(self))
self.logView.setSelectionMode(QTableView.SingleSelection)
self.logView.setSelectionBehavior(QTableView.SelectRows)
self.logView.setColumnHidden(ID, True)
self.logView.setColumnHidden(ASSETID, True)
self.logView.resizeColumnsToContents()
self.logView.horizontalHeader().setStretchLastSection(True)
logLabel = QLabel("&Logs")
logLabel.setBuddy(self.logView)
editActionsButton = QPushButton("&Edit Actions...")
editCategoriesButton = QPushButton("Ed&it Categories...")
quitButton = QPushButton("&Quit")
for button in (editActionsButton, editCategoriesButton, quitButton):
if MAC:
button.setDefault(False)
button.setAutoDefault(False)
else:
button.setFocusPolicy(Qt.NoFocus)
dataLayout = QVBoxLayout()
dataLayout.addWidget(assetLabel)
dataLayout.addWidget(self.assetView, 1)
dataLayout.addWidget(logLabel)
dataLayout.addWidget(self.logView)
buttonLayout = QVBoxLayout()
buttonLayout.addWidget(editActionsButton)
buttonLayout.addWidget(editCategoriesButton)
buttonLayout.addStretch()
buttonLayout.addWidget(quitButton)
layout = QHBoxLayout()
layout.addLayout(dataLayout, 1)
layout.addLayout(buttonLayout)
self.setLayout(layout)
self.connect(self.assetView.selectionModel(),
SIGNAL(("currentRowChanged(QModelIndex,QModelIndex)")),
self.assetChanged)
self.connect(editActionsButton, SIGNAL("clicked()"),
self.editActions)
self.connect(editCategoriesButton, SIGNAL("clicked()"),
self.editCategories)
self.connect(quitButton, SIGNAL("clicked()"), self.done)
self.assetChanged(self.assetView.currentIndex())
self.setMinimumWidth(650)
self.setWindowTitle("Asset Manager")
def done(self, result=1):
query = QSqlQuery()
query.exec_("DELETE FROM logs WHERE logs.assetid NOT IN"
"(SELECT id FROM assets)")
QDialog.done(self, 1)
def assetChanged(self, index):
if index.isValid():
record = self.assetModel.record(index.row())
id = record.value("id").toInt()[0]
self.logModel.setFilter(QString("assetid = %1").arg(id))
else:
self.logModel.setFilter("assetid = -1")
self.logModel.reset() # workaround for Qt <= 4.3.3/SQLite bug
self.logModel.select()
self.logView.horizontalHeader().setVisible(
self.logModel.rowCount() > 0)
if PYQT_VERSION_STR < "4.1.0":
self.logView.setColumnHidden(ID, True)
self.logView.setColumnHidden(ASSETID, True)
def addAsset(self):
row = (self.assetView.currentIndex().row()
if self.assetView.currentIndex().isValid() else 0)
QSqlDatabase.database().transaction()
self.assetModel.insertRow(row)
index = self.assetModel.index(row, NAME)
self.assetView.setCurrentIndex(index)
assetid = 1
query = QSqlQuery()
query.exec_("SELECT MAX(id) FROM assets")
if query.next():
assetid = query.value(0).toInt()[0]
query.prepare("INSERT INTO logs (assetid, date, actionid) "
"VALUES (:assetid, :date, :actionid)")
query.bindValue(":assetid", QVariant(assetid + 1))
query.bindValue(":date", QVariant(QDate.currentDate()))
query.bindValue(":actionid", QVariant(ACQUIRED))
query.exec_()
QSqlDatabase.database().commit()
self.assetView.edit(index)
def addAction(self):
index = self.assetView.currentIndex()
if not index.isValid():
return
QSqlDatabase.database().transaction()
record = self.assetModel.record(index.row())
assetid = record.value(ID).toInt()[0]
row = self.logModel.rowCount()
self.logModel.insertRow(row)
self.logModel.setData(self.logModel.index(row, ASSETID),
QVariant(assetid))
self.logModel.setData(self.logModel.index(row, DATE),
QVariant(QDate.currentDate()))
QSqlDatabase.database().commit()
index = self.logModel.index(row, ACTIONID)
self.logView.setCurrentIndex(index)
self.logView.edit(index)
def editActions(self):
form = ReferenceDataDlg("actions", "Action", self)
form.exec_()
def editCategories(self):
form = ReferenceDataDlg("categories", "Category", self)
form.exec_()
def main():
app = QApplication(sys.argv)
filename = os.path.join(os.path.dirname(__file__), "assetsdb.db")
create = not QFile.exists(filename)
db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName(filename)
if not db.open():
QMessageBox.warning(None, "Asset Manager",
QString("Database Error: %1")
.arg(db.lastError().text()))
sys.exit(1)
if create:
createFakeData()
form = MainForm()
form.show()
if create:
app.processEvents()
app.restoreOverrideCursor()
app.exec_()
del form
del db
我想出于效率的原因，与 QSqlRelationalDelegate 的 QComboBox 关联的模型不会在每次显示 QComboBox 时重新加载，解决方案是使用重新加载该模型select() 方法：
class AssetDelegate(QSqlRelationalDelegate):
# ...
def createEditor(self, parent, option, index):
if index.column() == ROOM:
editor = QLineEdit(parent)
regex = QRegExp(
r"(?:0[1-9]|1[0124-9]|2[0-7])" r"(?:0[1-9]|[1-5][0-9]|6[012])"
)
validator = QRegExpValidator(regex, parent)
editor.setValidator(validator)
editor.setInputMask("9999")
editor.setAlignment(Qt.AlignRight | Qt.AlignVCenter)
return editor
else:
<b>editor = QSqlRelationalDelegate.createEditor(self, parent, option, index)
if isinstance(editor, QComboBox) and instance(
editor.model(), QSqlTableModel
):
editor.model().select()
return editor</b>
我最近研究了 Mark Summerfield 的“使用 Python 和 Qt 进行快速 GUI 编程”第 15 章中的一个示例，该示例介绍了 SQL 数据库 TableView 建模的使用。在这个原始示例中，我发现了一些功能障碍，它会阻止 table 视图刷新组合框委托（即 QSqlRelation）。简单地说，代表 QSqlRelationalTableModel 数据的 table 视图中的组合框委托在关系 table 被修改后不会更新。
原文件名为chap15/assetmanager.pyw，可以找到elsewhere。下面我提供了重现该问题所需的代码片段。
在此示例中，为操作和类别 (QSqlRelationalTableModel) 建立了与 QSqlTableModel（self.assetModel 和 self.logModel）的关系，可以使用组合框委托（LogDelegate 或 AssetDelegate）对其进行修改。可以通过 ReferenceDataDlg 对话框添加新的操作或类别。
类别中添加了新记录
但是，一旦 ReferenceDataDlg 对话框关闭，即使新记录存在于 SQL table 中用于操作或类别，新创建的记录也不会出现在组合框委托中。
组合框委托未刷新
如何以编程方式刷新 table 视图中组合框委托中的项目列表：self.assetView 和 self.logView？
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from future_builtins import *
import os
import sys
from PyQt4.QtCore import (PYQT_VERSION_STR, QDate, QFile, QRegExp,
QString, QVariant, Qt, SIGNAL)
from PyQt4.QtGui import (QApplication, QCursor, QDateEdit, QDialog,
QHBoxLayout, QLabel, QLineEdit, QMessageBox, QPixmap,
QPushButton, QRegExpValidator, QStyleOptionViewItem, QTableView,
QVBoxLayout)
from PyQt4.QtSql import (QSqlDatabase, QSqlQuery, QSqlRelation,
QSqlRelationalDelegate, QSqlRelationalTableModel, QSqlTableModel)
MAC = True
try:
from PyQt4.QtGui import qt_mac_set_native_menubar
except ImportError:
MAC = False
ID = 0
NAME = ASSETID = 1
CATEGORYID = DATE = DESCRIPTION = 2
ROOM = ACTIONID = 3
ACQUIRED = 1
def createFakeData():
import random
print("Dropping tables...")
query = QSqlQuery()
query.exec_("DROP TABLE assets")
query.exec_("DROP TABLE logs")
query.exec_("DROP TABLE actions")
query.exec_("DROP TABLE categories")
QApplication.processEvents()
print("Creating tables...")
query.exec_("""CREATE TABLE actions (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
name VARCHAR(20) NOT NULL,
description VARCHAR(40) NOT NULL)""")
query.exec_("""CREATE TABLE categories (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
name VARCHAR(20) NOT NULL,
description VARCHAR(40) NOT NULL)""")
query.exec_("""CREATE TABLE assets (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
name VARCHAR(40) NOT NULL,
categoryid INTEGER NOT NULL,
room VARCHAR(4) NOT NULL,
FOREIGN KEY (categoryid) REFERENCES categories)""")
query.exec_("""CREATE TABLE logs (
id INTEGER PRIMARY KEY AUTOINCREMENT UNIQUE NOT NULL,
assetid INTEGER NOT NULL,
date DATE NOT NULL,
actionid INTEGER NOT NULL,
FOREIGN KEY (assetid) REFERENCES assets,
FOREIGN KEY (actionid) REFERENCES actions)""")
QApplication.processEvents()
print("Populating tables...")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Acquired', 'When installed')")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Broken', 'When failed and unusable')")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Repaired', 'When back in service')")
query.exec_("INSERT INTO actions (name, description) "
"VALUES ('Routine maintenance', "
"'When tested, refilled, etc.')")
query.exec_("INSERT INTO categories (name, description) VALUES "
"('Computer Equipment', "
"'Monitors, System Units, Peripherals, etc.')")
query.exec_("INSERT INTO categories (name, description) VALUES "
"('Furniture', 'Chairs, Tables, Desks, etc.')")
query.exec_("INSERT INTO categories (name, description) VALUES "
"('Electrical Equipment', 'Non-computer electricals')")
today = QDate.currentDate()
floors = range(1, 12) + range(14, 28)
monitors = (('17" LCD Monitor', 1),
('20" LCD Monitor', 1),
('21" LCD Monitor', 1),
('21" CRT Monitor', 1),
('24" CRT Monitor', 1))
computers = (("Computer (32-bit/80GB/0.5GB)", 1),
("Computer (32-bit/100GB/1GB)", 1),
("Computer (32-bit/120GB/1GB)", 1),
("Computer (64-bit/240GB/2GB)", 1),
("Computer (64-bit/320GB/4GB)", 1))
printers = (("Laser Printer (4 ppm)", 1),
("Laser Printer (6 ppm)", 1),
("Laser Printer (8 ppm)", 1),
("Laser Printer (16 ppm)", 1))
chairs = (("Secretary Chair", 2),
("Executive Chair (Basic)", 2),
("Executive Chair (Ergonimic)", 2),
("Executive Chair (Hi-Tech)", 2))
desks = (("Desk (Basic, 3 drawer)", 2),
("Desk (Standard, 3 drawer)", 2),
("Desk (Executive, 3 drawer)", 2),
("Desk (Executive, 4 drawer)", 2),
("Desk (Large, 4 drawer)", 2))
furniture = (("Filing Cabinet (3 drawer)", 2),
("Filing Cabinet (4 drawer)", 2),
("Filing Cabinet (5 drawer)", 2),
("Bookcase (4 shelves)", 2),
("Bookcase (6 shelves)", 2),
("Table (4 seater)", 2),
("Table (8 seater)", 2),
("Table (12 seater)", 2))
electrical = (("Fan (3 speed)", 3),
("Fan (5 speed)", 3),
("Photocopier (4 ppm)", 3),
("Photocopier (6 ppm)", 3),
("Photocopier (8 ppm)", 3),
("Shredder", 3))
query.prepare("INSERT INTO assets (name, categoryid, room) "
"VALUES (:name, :categoryid, :room)")
logQuery = QSqlQuery()
logQuery.prepare("INSERT INTO logs (assetid, date, actionid) "
"VALUES (:assetid, :date, :actionid)")
assetid = 1
for i in range(20):
room = QVariant("{0:02d}{1:02d}".format(
random.choice(floors), random.randint(1, 62)))
for name, category in (random.choice(monitors),
random.choice(computers), random.choice(chairs),
random.choice(desks), random.choice(furniture)):
query.bindValue(":name", QVariant(name))
query.bindValue(":categoryid", QVariant(category))
query.bindValue(":room", room)
query.exec_()
logQuery.bindValue(":assetid", QVariant(assetid))
when = today.addDays(-random.randint(7, 1500))
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid", QVariant(ACQUIRED))
logQuery.exec_()
if random.random() > 0.7:
logQuery.bindValue(":assetid", QVariant(assetid))
when = when.addDays(random.randint(1, 1500))
if when <= today:
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid",
QVariant(random.choice((2, 4))))
logQuery.exec_()
assetid += 1
if random.random() > 0.8:
name, category = random.choice(printers)
query.bindValue(":name", QVariant(name))
query.bindValue(":categoryid", QVariant(category))
query.bindValue(":room", room)
query.exec_()
logQuery.bindValue(":assetid", QVariant(assetid))
when = today.addDays(-random.randint(7, 1500))
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid", QVariant(ACQUIRED))
logQuery.exec_()
if random.random() > 0.6:
logQuery.bindValue(":assetid", QVariant(assetid))
when = when.addDays(random.randint(1, 1500))
if when <= today:
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid",
QVariant(random.choice((2, 4))))
logQuery.exec_()
assetid += 1
if random.random() > 0.6:
name, category = random.choice(electrical)
query.bindValue(":name", QVariant(name))
query.bindValue(":categoryid", QVariant(category))
query.bindValue(":room", room)
query.exec_()
logQuery.bindValue(":assetid", QVariant(assetid))
when = today.addDays(-random.randint(7, 1500))
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid", QVariant(ACQUIRED))
logQuery.exec_()
if random.random() > 0.5:
logQuery.bindValue(":assetid", QVariant(assetid))
when = when.addDays(random.randint(1, 1500))
if when <= today:
logQuery.bindValue(":date", QVariant(when))
logQuery.bindValue(":actionid",
QVariant(random.choice((2, 4))))
logQuery.exec_()
assetid += 1
QApplication.processEvents()
print("Assets:")
query.exec_("SELECT id, name, categoryid, room FROM assets "
"ORDER by id")
categoryQuery = QSqlQuery()
while query.next():
id = query.value(0).toInt()[0]
name = unicode(query.value(1).toString())
categoryid = query.value(2).toInt()[0]
room = unicode(query.value(3).toString())
categoryQuery.exec_(QString("SELECT name FROM categories "
"WHERE id = %1").arg(categoryid))
category = "{0}".format(categoryid)
if categoryQuery.next():
category = unicode(categoryQuery.value(0).toString())
print("{0}: {1} [{2}] {3}".format(id, name, category, room))
QApplication.processEvents()
class ReferenceDataDlg(QDialog):
def __init__(self, table, title, parent=None):
super(ReferenceDataDlg, self).__init__(parent)
self.model = QSqlTableModel(self)
self.model.setTable(table)
self.model.setSort(NAME, Qt.AscendingOrder)
self.model.setHeaderData(ID, Qt.Horizontal, QVariant("ID"))
self.model.setHeaderData(NAME, Qt.Horizontal, QVariant("Name"))
self.model.setHeaderData(DESCRIPTION, Qt.Horizontal,
QVariant("Description"))
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()
addButton = QPushButton("&Add")
deleteButton = QPushButton("&Delete")
okButton = QPushButton("&OK")
if not MAC:
addButton.setFocusPolicy(Qt.NoFocus)
deleteButton.setFocusPolicy(Qt.NoFocus)
buttonLayout = QHBoxLayout()
buttonLayout.addWidget(addButton)
buttonLayout.addWidget(deleteButton)
buttonLayout.addStretch()
buttonLayout.addWidget(okButton)
layout = QVBoxLayout()
layout.addWidget(self.view)
layout.addLayout(buttonLayout)
self.setLayout(layout)
self.connect(addButton, SIGNAL("clicked()"), self.addRecord)
self.connect(okButton, SIGNAL("clicked()"), self.accept)
self.setWindowTitle(
"Asset Manager - Edit {0} Reference Data".format(title))
def addRecord(self):
row = self.model.rowCount()
self.model.insertRow(row)
index = self.model.index(row, NAME)
self.view.setCurrentIndex(index)
self.view.edit(index)
class AssetDelegate(QSqlRelationalDelegate):
def __init__(self, parent=None):
super(AssetDelegate, self).__init__(parent)
def paint(self, painter, option, index):
myoption = QStyleOptionViewItem(option)
if index.column() == ROOM:
myoption.displayAlignment |= (Qt.AlignRight|Qt.AlignVCenter)
QSqlRelationalDelegate.paint(self, painter, myoption, index)
def createEditor(self, parent, option, index):
if index.column() == ROOM:
editor = QLineEdit(parent)
regex = QRegExp(r"(?:0[1-9]|1[0124-9]|2[0-7])"
r"(?:0[1-9]|[1-5][0-9]|6[012])")
validator = QRegExpValidator(regex, parent)
editor.setValidator(validator)
editor.setInputMask("9999")
editor.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
return editor
else:
return QSqlRelationalDelegate.createEditor(self, parent,
option, index)
def setEditorData(self, editor, index):
if index.column() == ROOM:
text = index.model().data(index, Qt.DisplayRole).toString()
editor.setText(text)
else:
QSqlRelationalDelegate.setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
if index.column() == ROOM:
model.setData(index, QVariant(editor.text()))
else:
QSqlRelationalDelegate.setModelData(self, editor, model,
index)
class LogDelegate(QSqlRelationalDelegate):
def __init__(self, parent=None):
super(LogDelegate, self).__init__(parent)
def paint(self, painter, option, index):
myoption = QStyleOptionViewItem(option)
if index.column() == DATE:
myoption.displayAlignment |= (Qt.AlignRight|Qt.AlignVCenter)
QSqlRelationalDelegate.paint(self, painter, myoption, index)
def createEditor(self, parent, option, index):
if (index.column() == ACTIONID and
index.model().data(index, Qt.DisplayRole).toInt()[0] ==
ACQUIRED): # Acquired is read-only
return
if index.column() == DATE:
editor = QDateEdit(parent)
editor.setMaximumDate(QDate.currentDate())
editor.setDisplayFormat("yyyy-MM-dd")
if PYQT_VERSION_STR >= "4.1.0":
editor.setCalendarPopup(True)
editor.setAlignment(Qt.AlignRight|
Qt.AlignVCenter)
return editor
else:
return QSqlRelationalDelegate.createEditor(self, parent,
option, index)
def setEditorData(self, editor, index):
if index.column() == DATE:
date = index.model().data(index, Qt.DisplayRole).toDate()
editor.setDate(date)
else:
QSqlRelationalDelegate.setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
if index.column() == DATE:
model.setData(index, QVariant(editor.date()))
else:
QSqlRelationalDelegate.setModelData(self, editor, model,
index)
class MainForm(QDialog):
def __init__(self):
super(MainForm, self).__init__()
self.assetModel = QSqlRelationalTableModel(self)
self.assetModel.setTable("assets")
self.assetModel.setRelation(CATEGORYID,
QSqlRelation("categories", "id", "name"))
self.assetModel.setSort(ROOM, Qt.AscendingOrder)
self.assetModel.setHeaderData(ID, Qt.Horizontal, QVariant("ID"))
self.assetModel.setHeaderData(NAME, Qt.Horizontal,
QVariant("Name"))
self.assetModel.setHeaderData(CATEGORYID, Qt.Horizontal,
QVariant("Category"))
self.assetModel.setHeaderData(ROOM, Qt.Horizontal,
QVariant("Room"))
self.assetModel.select()
self.assetView = QTableView()
self.assetView.setModel(self.assetModel)
self.assetView.setItemDelegate(AssetDelegate(self))
self.assetView.setSelectionMode(QTableView.SingleSelection)
self.assetView.setSelectionBehavior(QTableView.SelectRows)
self.assetView.setColumnHidden(ID, True)
self.assetView.resizeColumnsToContents()
assetLabel = QLabel("A&ssets")
assetLabel.setBuddy(self.assetView)
self.logModel = QSqlRelationalTableModel(self)
self.logModel.setTable("logs")
self.logModel.setRelation(ACTIONID,
QSqlRelation("actions", "id", "name"))
self.logModel.setSort(DATE, Qt.AscendingOrder)
self.logModel.setHeaderData(DATE, Qt.Horizontal, QVariant("Date"))
self.logModel.setHeaderData(ACTIONID, Qt.Horizontal,
QVariant("Action"))
self.logModel.select()
self.logView = QTableView()
self.logView.setModel(self.logModel)
self.logView.setItemDelegate(LogDelegate(self))
self.logView.setSelectionMode(QTableView.SingleSelection)
self.logView.setSelectionBehavior(QTableView.SelectRows)
self.logView.setColumnHidden(ID, True)
self.logView.setColumnHidden(ASSETID, True)
self.logView.resizeColumnsToContents()
self.logView.horizontalHeader().setStretchLastSection(True)
logLabel = QLabel("&Logs")
logLabel.setBuddy(self.logView)
editActionsButton = QPushButton("&Edit Actions...")
editCategoriesButton = QPushButton("Ed&it Categories...")
quitButton = QPushButton("&Quit")
for button in (editActionsButton, editCategoriesButton, quitButton):
if MAC:
button.setDefault(False)
button.setAutoDefault(False)
else:
button.setFocusPolicy(Qt.NoFocus)
dataLayout = QVBoxLayout()
dataLayout.addWidget(assetLabel)
dataLayout.addWidget(self.assetView, 1)
dataLayout.addWidget(logLabel)
dataLayout.addWidget(self.logView)
buttonLayout = QVBoxLayout()
buttonLayout.addWidget(editActionsButton)
buttonLayout.addWidget(editCategoriesButton)
buttonLayout.addStretch()
buttonLayout.addWidget(quitButton)
layout = QHBoxLayout()
layout.addLayout(dataLayout, 1)
layout.addLayout(buttonLayout)
self.setLayout(layout)
self.connect(self.assetView.selectionModel(),
SIGNAL(("currentRowChanged(QModelIndex,QModelIndex)")),
self.assetChanged)
self.connect(editActionsButton, SIGNAL("clicked()"),
self.editActions)
self.connect(editCategoriesButton, SIGNAL("clicked()"),
self.editCategories)
self.connect(quitButton, SIGNAL("clicked()"), self.done)
self.assetChanged(self.assetView.currentIndex())
self.setMinimumWidth(650)
self.setWindowTitle("Asset Manager")
def done(self, result=1):
query = QSqlQuery()
query.exec_("DELETE FROM logs WHERE logs.assetid NOT IN"
"(SELECT id FROM assets)")
QDialog.done(self, 1)
def assetChanged(self, index):
if index.isValid():
record = self.assetModel.record(index.row())
id = record.value("id").toInt()[0]
self.logModel.setFilter(QString("assetid = %1").arg(id))
else:
self.logModel.setFilter("assetid = -1")
self.logModel.reset() # workaround for Qt <= 4.3.3/SQLite bug
self.logModel.select()
self.logView.horizontalHeader().setVisible(
self.logModel.rowCount() > 0)
if PYQT_VERSION_STR < "4.1.0":
self.logView.setColumnHidden(ID, True)
self.logView.setColumnHidden(ASSETID, True)
def addAsset(self):
row = (self.assetView.currentIndex().row()
if self.assetView.currentIndex().isValid() else 0)
QSqlDatabase.database().transaction()
self.assetModel.insertRow(row)
index = self.assetModel.index(row, NAME)
self.assetView.setCurrentIndex(index)
assetid = 1
query = QSqlQuery()
query.exec_("SELECT MAX(id) FROM assets")
if query.next():
assetid = query.value(0).toInt()[0]
query.prepare("INSERT INTO logs (assetid, date, actionid) "
"VALUES (:assetid, :date, :actionid)")
query.bindValue(":assetid", QVariant(assetid + 1))
query.bindValue(":date", QVariant(QDate.currentDate()))
query.bindValue(":actionid", QVariant(ACQUIRED))
query.exec_()
QSqlDatabase.database().commit()
self.assetView.edit(index)
def addAction(self):
index = self.assetView.currentIndex()
if not index.isValid():
return
QSqlDatabase.database().transaction()
record = self.assetModel.record(index.row())
assetid = record.value(ID).toInt()[0]
row = self.logModel.rowCount()
self.logModel.insertRow(row)
self.logModel.setData(self.logModel.index(row, ASSETID),
QVariant(assetid))
self.logModel.setData(self.logModel.index(row, DATE),
QVariant(QDate.currentDate()))
QSqlDatabase.database().commit()
index = self.logModel.index(row, ACTIONID)
self.logView.setCurrentIndex(index)
self.logView.edit(index)
def editActions(self):
form = ReferenceDataDlg("actions", "Action", self)
form.exec_()
def editCategories(self):
form = ReferenceDataDlg("categories", "Category", self)
form.exec_()
def main():
app = QApplication(sys.argv)
filename = os.path.join(os.path.dirname(__file__), "assetsdb.db")
create = not QFile.exists(filename)
db = QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName(filename)
if not db.open():
QMessageBox.warning(None, "Asset Manager",
QString("Database Error: %1")
.arg(db.lastError().text()))
sys.exit(1)
if create:
createFakeData()
form = MainForm()
form.show()
if create:
app.processEvents()
app.restoreOverrideCursor()
app.exec_()
del form
del db
我想出于效率的原因，与 QSqlRelationalDelegate 的 QComboBox 关联的模型不会在每次显示 QComboBox 时重新加载，解决方案是使用重新加载该模型select() 方法：
class AssetDelegate(QSqlRelationalDelegate):
# ...
def createEditor(self, parent, option, index):
if index.column() == ROOM:
editor = QLineEdit(parent)
regex = QRegExp(
r"(?:0[1-9]|1[0124-9]|2[0-7])" r"(?:0[1-9]|[1-5][0-9]|6[012])"
)
validator = QRegExpValidator(regex, parent)
editor.setValidator(validator)
editor.setInputMask("9999")
editor.setAlignment(Qt.AlignRight | Qt.AlignVCenter)
return editor
else:
<b>editor = QSqlRelationalDelegate.createEditor(self, parent, option, index)
if isinstance(editor, QComboBox) and instance(
editor.model(), QSqlTableModel
):
editor.model().select()
return editor</b>