带有日期和 sqlite 的 QSortFilterProxyModel

Question

我几乎逐字逐句地在 PyQt5 上重新实现了这个示例。此示例中的问题是：假设您在模型中输入 QDate，但在我的情况下，模型取自 sqlite 数据库，因此日期只是文本。

from PyQt5.QtCore import (QDate, QDateTime, QRegExp, QSortFilterProxyModel, Qt,
                          QTime)
from PyQt5.QtGui import QStandardItemModel
from PyQt5.QtWidgets import (QApplication, QCheckBox, QComboBox, QDateEdit,
                             QGridLayout, QGroupBox, QHBoxLayout, QLabel, QLineEdit, QTreeView,
                             QVBoxLayout, QWidget,QTableView)


class MySortFilterProxyModel(QSortFilterProxyModel):
    def __init__(self, parent=None):
        super(MySortFilterProxyModel, self).__init__(parent)

        self.minDate = QDate()
        self.maxDate = QDate()

    def setFilterMinimumDate(self, date):
        self.minDate = date
        self.invalidateFilter()

    def filterMinimumDate(self):
        return self.minDate

    def setFilterMaximumDate(self, date):
        self.maxDate = date
        self.invalidateFilter()

    def filterMaximumDate(self):
        return self.maxDate

    def filterAcceptsRow(self, sourceRow, sourceParent):
        index0 = self.sourceModel().index(sourceRow, 0, sourceParent)
        index1 = self.sourceModel().index(sourceRow, 1, sourceParent)
        index2 = self.sourceModel().index(sourceRow, 2, sourceParent)


        return ((self.filterRegExp().indexIn(self.sourceModel().data(index0)) >= 0
                 or self.filterRegExp().indexIn(self.sourceModel().data(index1)) >= 0)
                and self.dateInRange(self.sourceModel().data(index2)))

    def dateInRange(self, date):
        if isinstance(date, QDateTime):
            date = date.date()

        return ((not self.minDate.isValid() or date >= self.minDate)
                and (not self.maxDate.isValid() or date <= self.maxDate))


class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()

        self.proxyModel = MySortFilterProxyModel(self)
        self.proxyModel.setDynamicSortFilter(True)

        self.sourceView = QTreeView()
        self.sourceView.setRootIsDecorated(False)
        self.sourceView.setAlternatingRowColors(True)

        sourceLayout = QHBoxLayout()
        sourceLayout.addWidget(self.sourceView)
        sourceGroupBox = QGroupBox("Original Model")
        sourceGroupBox.setLayout(sourceLayout)

        self.filterCaseSensitivityCheckBox = QCheckBox("Case sensitive filter")
        self.filterCaseSensitivityCheckBox.setChecked(True)
        self.filterPatternLineEdit = QLineEdit()
        self.filterPatternLineEdit.setText("Grace|Sports")
        filterPatternLabel = QLabel("&Filter pattern:")
        filterPatternLabel.setBuddy(self.filterPatternLineEdit)
        self.filterSyntaxComboBox = QComboBox()
        self.filterSyntaxComboBox.addItem("Regular expression", QRegExp.RegExp)
        self.filterSyntaxComboBox.addItem("Wildcard", QRegExp.Wildcard)
        self.filterSyntaxComboBox.addItem("Fixed string", QRegExp.FixedString)
        self.fromDateEdit = QDateEdit()
        self.fromDateEdit.setDate(QDate(2006, 12, 22))
        self.fromDateEdit.setCalendarPopup(True)
        fromLabel = QLabel("F&rom:")
        fromLabel.setBuddy(self.fromDateEdit)
        self.toDateEdit = QDateEdit()
        self.toDateEdit.setDate(QDate(2007, 1, 5))
        self.toDateEdit.setCalendarPopup(True)
        toLabel = QLabel("&To:")
        toLabel.setBuddy(self.toDateEdit)

        self.filterPatternLineEdit.textChanged.connect(self.textFilterChanged)
        self.filterSyntaxComboBox.currentIndexChanged.connect(self.textFilterChanged)
        self.filterCaseSensitivityCheckBox.toggled.connect(self.textFilterChanged)
        self.fromDateEdit.dateChanged.connect(self.dateFilterChanged)
        self.toDateEdit.dateChanged.connect(self.dateFilterChanged)

        self.proxyView = QTableView()
        # self.proxyView.setRootIsDecorated(False)
        self.proxyView.setAlternatingRowColors(True)
        self.proxyView.setModel(self.proxyModel)
        self.proxyView.setSortingEnabled(True)
        self.proxyView.sortByColumn(1, Qt.AscendingOrder)

        self.textFilterChanged()
        self.dateFilterChanged()

        proxyLayout = QGridLayout()
        proxyLayout.addWidget(self.proxyView, 0, 0, 1, 3)
        proxyLayout.addWidget(filterPatternLabel, 1, 0)
        proxyLayout.addWidget(self.filterPatternLineEdit, 1, 1)
        proxyLayout.addWidget(self.filterSyntaxComboBox, 1, 2)
        proxyLayout.addWidget(self.filterCaseSensitivityCheckBox, 2, 0, 1, 3)
        proxyLayout.addWidget(fromLabel, 3, 0)
        proxyLayout.addWidget(self.fromDateEdit, 3, 1, 1, 2)
        proxyLayout.addWidget(toLabel, 4, 0)
        proxyLayout.addWidget(self.toDateEdit, 4, 1, 1, 2)
        proxyGroupBox = QGroupBox("Sorted/Filtered Model")
        proxyGroupBox.setLayout(proxyLayout)

        mainLayout = QVBoxLayout()
        mainLayout.addWidget(sourceGroupBox)
        mainLayout.addWidget(proxyGroupBox)
        self.setLayout(mainLayout)

        self.setWindowTitle("Custom Sort/Filter Model")
        self.resize(500, 450)

    def setSourceModel(self, model):
        self.proxyModel.setSourceModel(model)
        self.sourceView.setModel(model)

    def textFilterChanged(self):
        syntax = QRegExp.PatternSyntax(
            self.filterSyntaxComboBox.itemData(
                self.filterSyntaxComboBox.currentIndex()))
        caseSensitivity = (
                self.filterCaseSensitivityCheckBox.isChecked()
                and Qt.CaseSensitive or Qt.CaseInsensitive)
        regExp = QRegExp(self.filterPatternLineEdit.text(), caseSensitivity, syntax)
        self.proxyModel.setFilterRegExp(regExp)

    def dateFilterChanged(self):
        self.proxyModel.setFilterMinimumDate(self.fromDateEdit.date())
        self.proxyModel.setFilterMaximumDate(self.toDateEdit.date())


    def addMail(model, subject, sender, date):
        model.insertRow(0)
        model.setData(model.index(0, 0), subject)
        model.setData(model.index(0, 1), sender)
        model.setData(model.index(0, 2), date)


def createMailModel(parent):
    model = QStandardItemModel(0, 3, parent)

    model.setHeaderData(0, Qt.Horizontal, "Subject")
    model.setHeaderData(1, Qt.Horizontal, "Sender")
    model.setHeaderData(2, Qt.Horizontal, "Date")

    addMail(model, "Happy New Year!", "Grace K. <grace@software-inc.com>",
            QDateTime(QDate(2006, 12, 31), QTime(17, 3)))
    addMail(model, "Radically new concept", "Grace K. <grace@software-inc.com>",
            QDateTime(QDate(2006, 12, 22), QTime(9, 44)))
    addMail(model, "Accounts", "pascale@nospam.com",
            QDateTime(QDate(2006, 12, 31), QTime(12, 50)))
    addMail(model, "Expenses", "Joe Bloggs <joe@bloggs.com>",
            QDateTime(QDate(2006, 12, 25), QTime(11, 39)))
    addMail(model, "Re: Expenses", "Andy <andy@nospam.com>",
            QDateTime(QDate(2007, 1, 2), QTime(16, 5)))
    addMail(model, "Re: Accounts", "Joe Bloggs <joe@bloggs.com>",
            QDateTime(QDate(2007, 1, 3), QTime(14, 18)))
    addMail(model, "Re: Accounts", "Andy <andy@nospam.com>",
            QDateTime(QDate(2007, 1, 3), QTime(14, 26)))
    addMail(model, "Sports", "Linda Smith <linda.smith@nospam.com>",
            QDateTime(QDate(2007, 1, 5), QTime(11, 33)))
    addMail(model, "AW: Sports", "Rolf Newschweinstein <rolfn@nospam.com>",
            QDateTime(QDate(2007, 1, 5), QTime(12, 0)))
    addMail(model, "RE: Sports", "Petra Schmidt <petras@nospam.com>",
            QDateTime(QDate(2007, 1, 5), QTime(12, 1)))

    return model


if __name__ == "__main__":
    import sys

    app = QApplication(sys.argv)

    window = Window()
    window.setSourceModel(createMailModel(window))
    window.show()        
    sys.exit(app.exec_())

我尝试将这一行：self.dateInRange(self.sourceModel().data(index2))) 更改为 this:self.dateInRange(datetime.strptime(self.sourceModel().data(index2),"%Y/%m/%d %H:%M")))，以便将数据 TXT 转换为格式日期，这对于过滤很有效，但如果我使用向数据库添加新行则会崩溃：

@pyqtSlot()
def on_pushButton_clicked(self):
    self.add_record()

def add_record(self):
    row = self.db_model.rowCount()
    self.db_model.insertRow(row)

我哪里出错了？

相关数据库部分：

class essaiFindDb():
    def __init__(self):
        self.db = QSqlDatabase.addDatabase("QSQLITE")
        self.db.setDatabaseName("essai_find_database.db")

        self.db.open()

        query = QSqlQuery()
        query.exec_('''CREATE TABLE Pilots_exp(id INTEGER PRIMARY KEY UNIQUE , pilot_1 TEXT,aircraft TEXT, date_time1 TEXT, date_time2 TEXT, total TEXT)''')

Answer 1

由于您没有提供 MCVE，因此无法分析问题。

所以我的解决方案将基于您指出的内容：

• 第 3(date_time1) 和 4(date_time2) 列具有日期格式。
• 日期格式为%Y/%m/%d %H:%M(python日期时间格式)-yyyy/MM/dd hh:mm(Qt格式)
• 日期过滤器应用于第 3 列。

正如您所注意到的，最简单的事情是如果第 3 列和第 4 列是 QDateTime，那么我将创建一个代理来进行转换。

另一方面，我将过滤器分为时间过滤器和文本过滤器，以获得更清晰的代码。

在这种情况下，我将应用级联代理：

┌-----------------┐    ┌---------------------------┐    ┌------------------------┐    ┌------------------------┐
|    db_model     | -> |     text_to_QDateTime     | -> |       filter_date      | -> |       filter_text      |
|(QSqlTableModel) |    | (ConvertToDateProxyModel) |    | (FilterDateProxyModel) |    | (FilterTextProxyModel) |
└-----------------┘    └---------------------------┘    └------------------------┘    └------------------------┘

综合以上，解决办法是：

from PyQt5 import QtCore, QtGui, QtWidgets, QtSql 

def createConnection():
    db = QtSql.QSqlDatabase.addDatabase('QSQLITE')
    db.setDatabaseName('essai_find_database.db')
    if not db.open():
        QtWidgets.QMessageBox.critical(None, QtWidgets.qApp.tr("Cannot open database"),
                             QtWidgets.qApp.tr("Unable to establish a database connection.\n"
                                     "This example needs SQLite support. Please read "
                                     "the Qt SQL driver documentation for information "
                                     "how to build it.\n\n"
                                     "Click Cancel to exit."),
                            QtWidgets.QMessageBox.Cancel)
        return False

    query = QtSql.QSqlQuery()
    return query.exec_('''
        CREATE TABLE IF NOT EXISTS Pilots_exp ( 
            id INTEGER PRIMARY KEY UNIQUE ,
            pilot_1 TEXT,aircraft TEXT, 
            date_time1 TEXT, date_time2 TEXT, 
            total TEXT)
        ''')

class ConvertToDateProxyModel(QtCore.QIdentityProxyModel):
    def __init__(self, parent=None):
        super(ConvertToDateProxyModel, self).__init__(parent)
        self._columns = []
        self._fmt = ""

    def set_format(self, fmt):
        self._fmt = fmt

    def set_columns(self, columns):
        self._columns = columns

    def data(self, index, role=QtCore.Qt.DisplayRole):
        v = super(ConvertToDateProxyModel, self).data(index, role)
        if not index.isValid():
            return
        if index.column() in self._columns and self._fmt:
            return QtCore.QDateTime.fromString(v, self._fmt)
        return v

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        if index.column() in self._columns and self._fmt:
            sm = self.sourceModel()
            ix = self.mapToSource(index)
            return sm.setData(ix, value.toString(self._fmt), role)
        return super(ConvertToDateProxyModel, self).setData(index, value, role)

class FilterDateProxyModel(QtCore.QSortFilterProxyModel):
    def __init__(self, parent=None):
        super(FilterDateProxyModel, self).__init__(parent)
        self._from_date, self._to_date = QtCore.QDate(), QtCore.QDate()

    def setRange(self, from_date, to_date):
        self._from_date = from_date
        self._to_date = to_date
        self.invalidateFilter()

    def filterAcceptsRow(self, sourceRow, sourceParent):
        if any([not date.isValid() for date in (self._from_date, self._to_date,)]):
            return True
        ix = self.sourceModel().index(sourceRow, self.filterKeyColumn(), sourceParent)
        dt = ix.data().date()
        return self._from_date <= dt <= self._to_date

class FilterTextProxyModel(QtCore.QSortFilterProxyModel):
    def __init__(self, parent=None):
        super(FilterTextProxyModel, self).__init__(parent)
        self._columns = []

    def set_columns(self, columns):
        self._columns = columns
        self.invalidateFilter()

    def filterAcceptsRow(self, sourceRow, sourceParent):
        if not self._columns:
            return True
        values = []
        for c in range(self.sourceModel().columnCount()):
            if c in self._columns:
                ix = self.sourceModel().index(sourceRow, c, sourceParent)
                values.append(self.filterRegExp().indexIn(ix.data()) >= 0)
        return any(values)


class AddDialog(QtWidgets.QDialog):
    def __init__(self, formats, parent=None):
        super(AddDialog, self).__init__(parent)
        self._editors = dict()
        flay = QtWidgets.QFormLayout(self)
        for key, value in formats.items():
            editor = self.create_editor_by_type(value)
            flay.addRow(key, editor)
            self._editors[key] = editor

        buttonBox = QtWidgets.QDialogButtonBox()
        buttonBox.setOrientation(QtCore.Qt.Horizontal)
        buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)

        buttonBox.accepted.connect(self.accept)
        buttonBox.rejected.connect(self.reject)
        flay.addRow(buttonBox)

    def create_editor_by_type(self, t):
        editor = QtWidgets.QLineEdit()
        if t == QtCore.QDateTime:
            editor = QtWidgets.QDateTimeEdit(
                dateTime= QtCore.QDateTime.currentDateTime(),
                displayFormat="yyyy/MM/dd hh:mm",
                calendarPopup=True
            )
        return editor

    def get_value_from_editor(self, editor):
        if isinstance(editor, QtWidgets.QLineEdit):
            return editor.text()
        if isinstance(editor, QtWidgets.QDateTimeEdit):
            return editor.dateTime()

    def get_values(self):
        result = dict()
        for key, editor in self._editors.items():
            result[key] = self.get_value_from_editor(editor)
        return result

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        self.db_model = QtSql.QSqlTableModel(self)
        self.db_model.setTable("Pilots_exp")
        self.db_model.select()

        proxy_convert_to_date = ConvertToDateProxyModel(self)
        proxy_convert_to_date.setSourceModel(self.db_model)
        proxy_convert_to_date.set_columns([3, 4])
        proxy_convert_to_date.set_format("yyyy/MM/dd hh:mm")

        sourceGroupBox = QtWidgets.QGroupBox("Original Model")
        sourceView = QtWidgets.QTableView(alternatingRowColors=True)
        sourceView.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Stretch)
        sourceView.verticalHeader().hide()
        sourceView.setModel(proxy_convert_to_date)
        sourceLayout = QtWidgets.QHBoxLayout(sourceGroupBox)
        sourceLayout.addWidget(sourceView)

        self._proxy_date = FilterDateProxyModel(self)
        self._proxy_date.setFilterKeyColumn(3)
        self._proxy_date.setSourceModel(proxy_convert_to_date)

        self._proxy_filter = FilterTextProxyModel(self)
        self._proxy_filter.setSourceModel(self._proxy_date)
        self._proxy_filter.set_columns([1, 2])

        proxyGroupBox = QtWidgets.QGroupBox("Sorted/Filtered Model")
        proxyView = QtWidgets.QTableView()
        proxyView.verticalHeader().hide()
        proxyView.horizontalHeader().setSectionResizeMode(QtWidgets.QHeaderView.Stretch)
        proxyView.setSortingEnabled(True)
        proxyView.setModel(self._proxy_filter)
        proxyView.sortByColumn(1, QtCore.Qt.AscendingOrder)
        proxyLayout = QtWidgets.QVBoxLayout(proxyGroupBox)
        proxyLayout.addWidget(proxyView)

        filterPatternLabel = QtWidgets.QLabel("&Filter pattern:")
        self.filterPatternLineEdit = QtWidgets.QLineEdit(
            "Grace|Sports",
            textChanged=self.update_filter_text
        )
        filterPatternLabel.setBuddy(self.filterPatternLineEdit)
        self.filterSyntaxComboBox = QtWidgets.QComboBox(
            currentIndexChanged=self.update_filter_text
        )

        self.filterCaseSensitivityCheckBox = QtWidgets.QCheckBox(
            "Case sensitive filter", 
            checked=True,
            stateChanged=self.update_filter_text
        )
        self.fromDateEdit = QtWidgets.QDateEdit(
            calendarPopup=True, 
            date=QtCore.QDate(2006, 12, 22),
            dateChanged=self.update_filter_date
        )
        self.toDateEdit = QtWidgets.QDateEdit(
            calendarPopup=True, 
            date=QtCore.QDate(2007, 1, 5),
            dateChanged=self.update_filter_date
        )

        self.filterSyntaxComboBox.addItem("Regular expression", QtCore.QRegExp.RegExp)
        self.filterSyntaxComboBox.addItem("Wildcard", QtCore.QRegExp.Wildcard)
        self.filterSyntaxComboBox.addItem("Fixed string", QtCore.QRegExp.FixedString)
        self.update_filter_text()
        self.update_filter_date()

        flay = QtWidgets.QFormLayout()
        flay.addRow("F&rom:", self.fromDateEdit)
        flay.addRow("&To:", self.toDateEdit)

        hlay = QtWidgets.QHBoxLayout()
        hlay.addWidget(filterPatternLabel)
        hlay.addWidget(self.filterPatternLineEdit)
        hlay.addWidget(self.filterSyntaxComboBox)
        proxyLayout.addWidget(self.filterCaseSensitivityCheckBox)
        proxyLayout.addLayout(hlay)
        proxyLayout.addLayout(flay)

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(sourceGroupBox)
        lay.addWidget(proxyGroupBox)

        proxyView.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
        proxyView.customContextMenuRequested.connect(self.on_customContextMenuRequested)

    @QtCore.pyqtSlot(QtCore.QPoint)
    def on_customContextMenuRequested(self, p):
        view = self.sender()
        menu = QtWidgets.QMenu()
        add_row_action = menu.addAction("Add Row")
        action = menu.exec_(view.viewport().mapToGlobal(p))
        if action == add_row_action:
            self.add_record()

    @QtCore.pyqtSlot()
    def update_filter_text(self):
        syntax = self.filterSyntaxComboBox.currentData()
        caseSensitivity = QtCore.Qt.CaseSensitive \
            if self.filterCaseSensitivityCheckBox.isChecked() \
            else QtCore.Qt.CaseInsensitive
        regExp = QtCore.QRegExp(self.filterPatternLineEdit.text(), caseSensitivity, syntax)
        self._proxy_filter.setFilterRegExp(regExp)

    @QtCore.pyqtSlot()
    def update_filter_date(self):
        self._proxy_date.setRange(self.fromDateEdit.date(), self.toDateEdit.date())

    def add_record(self):
        d = {}
        rec = self.db_model.record()
        for i in range(rec.count()):
            d[rec.fieldName(i)] = type(rec.value(i))

        for i in (3, 4): d[rec.fieldName(i)] = QtCore.QDateTime

        del d[rec.fieldName(0)]

        dialog = AddDialog(d, self)
        if dialog.exec_() == QtWidgets.QDialog.Accepted:
            results = dialog.get_values()
            for i in (3, 4):
                k = rec.fieldName(i)
                results[k] = results[k].toString("yyyy/MM/dd hh:mm")
            for k, value in results.items():
                rec.setValue(k, value)
            self.db_model.insertRecord(-1, rec)
            self.db_model.select()

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    if not createConnection():
        sys.exit(-1)
    w = Widget()
    w.resize(960, 480)
    w.show()
    sys.exit(app.exec_())