如何使用 QSqlTableModel 为 Qtableview 创建过滤器行。？

Question

是否可以使用 QSqlTableModel 为 Qtableview 创建行过滤器。 我正在唱“QSqlTableModel”来显示来自 SQLite 的 Qtableview 上的数据。但我正在尝试过滤行。当我执行代码时，我遇到的错误是

第 44 行，在 for row in range(self.model.rowCount()) AttributeError: 'QSqlTableModel' object has no attribute 'item'

我试过但没有得到任何解决方案。可以用 QSqlTableModel 做到这一点吗？ 当我单击 Qtableview 的任何列时，我想显示来自 tableview 的过滤项目。我正在将 Qtableview 与 QSqlTableModel 一起使用。

我想像图片中显示的那样做

from PyQt5 import QtCore, QtGui, QtWidgets, QtSql
from PyQt5.QtSql import *


class myWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(myWindow, self).__init__(parent)
        self.centralwidget  = QtWidgets.QWidget(self)
        self.view           = QtWidgets.QTableView(self.centralwidget)

        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)

        self.gridLayout.addWidget(self.view, 1, 0, 1, 3)

        self.setCentralWidget(self.centralwidget)

       # self.model = QtGui.QStandardItemModel(self)

        db = QSqlDatabase.addDatabase("QSQLITE")
        db.setDatabaseName("model.db")
        db.open()

        self.model = QSqlTableModel(self)
        self.model.setTable("sheet")
        self.model.select()
        self.view.setModel(self.model)

        self.proxy = QtCore.QSortFilterProxyModel(self)
        self.proxy.setSourceModel(self.model)

        self.view.setModel(self.proxy)


        self.horizontalHeader = self.view.horizontalHeader()
        self.horizontalHeader.sectionClicked.connect(self.on_view_horizontalHeader_sectionClicked)

    @QtCore.pyqtSlot(int)
    def on_view_horizontalHeader_sectionClicked(self, logicalIndex):
        self.logicalIndex   = logicalIndex
        self.menuValues     = QtWidgets.QMenu(self)
        self.signalMapper   = QtCore.QSignalMapper(self)  

        valuesUnique = [    self.model.item(row, self.logicalIndex).text()
                            for row in range(self.model.rowCount())
                            ]

        actionAll = QtWidgets.QAction("All", self)
        actionAll.triggered.connect(self.on_actionAll_triggered)
        self.menuValues.addAction(actionAll)
        self.menuValues.addSeparator()


        for actionNumber, actionName in enumerate(sorted(list(set(valuesUnique)))):              
            action = QtWidgets.QAction(actionName, self)
            self.signalMapper.setMapping(action, actionNumber)  
            action.triggered.connect(self.signalMapper.map)  
            self.menuValues.addAction(action)

        self.signalMapper.mapped.connect(self.on_signalMapper_mapped)  

        headerPos = self.view.mapToGlobal(self.horizontalHeader.pos())        

        posY = headerPos.y() + self.horizontalHeader.height()
        posX = headerPos.x() + self.horizontalHeader.sectionPosition(self.logicalIndex)

        self.menuValues.exec_(QtCore.QPoint(posX, posY))

    @QtCore.pyqtSlot()
    def on_actionAll_triggered(self):
        filterColumn = self.logicalIndex
        filterString = QtCore.QRegExp(  "",
                                        QtCore.Qt.CaseInsensitive,
                                        QtCore.QRegExp.RegExp
                                        )

        self.proxy.setFilterRegExp(filterString)
        self.proxy.setFilterKeyColumn(filterColumn)

    @QtCore.pyqtSlot(int)
    def on_signalMapper_mapped(self, i):
        stringAction = self.signalMapper.mapping(i).text()
        filterColumn = self.logicalIndex
        filterString = QtCore.QRegExp(  stringAction,
                                        QtCore.Qt.CaseSensitive,
                                        QtCore.QRegExp.FixedString
                                        )

        self.proxy.setFilterRegExp(filterString)
        self.proxy.setFilterKeyColumn(filterColumn)


if __name__ == "__main__":
    import sys

    app  = QtWidgets.QApplication(sys.argv)
    main = myWindow()
    main.show()
    main.resize(400, 600)
    sys.exit(app.exec_())

Answer 1

实现了 QSortFilterProxyModel 来比较字符串，但在您的情况下，您有不同类型的值，因此必须实现自定义过滤器。

要处理与每个选项相关的不同类型的数据，然后在 QAction 中分别使用 setData() 和 data() 存储和访问值。

另一方面，我认为没有必要使用 QSignalMapper 或信号，因为如果 exec_() 方法被选中则返回 QAction，否则返回 None。

要访问每个项目的值，必须使用模型的 data() 方法：

from PyQt5 import QtCore, QtGui, QtWidgets, QtSql


class FilterProxyModel(QtCore.QSortFilterProxyModel):
    def __init__(self, parent=None):
        super().__init__(parent)
        self._filter_value = None

    @property
    def filter_value(self):
        return self._filter_value

    @filter_value.setter
    def filter_value(self, value):
        self._filter_value = value
        self.invalidateFilter()

    def filterAcceptsRow(self, sourceRow, sourceParent):
        if self.filter_value is None:
            return True
        value = (
            self.sourceModel()
            .index(sourceRow, self.filterKeyColumn(), sourceParent)
            .data(self.filterRole())
        )
        return value == self.filter_value


class myWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(myWindow, self).__init__(parent)
        self.centralwidget = QtWidgets.QWidget(self)
        self.view = QtWidgets.QTableView(self.centralwidget)

        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)

        self.gridLayout.addWidget(self.view, 1, 0, 1, 3)

        self.setCentralWidget(self.centralwidget)

        db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
        db.setDatabaseName("model.db")
        db.open()

        self.model = QtSql.QSqlTableModel(self)
        self.model.setTable("sheet")
        self.model.select()
        self.view.setModel(self.model)

        self.proxy = FilterProxyModel(self)
        self.proxy.setSourceModel(self.model)

        self.view.setModel(self.proxy)

        self.horizontalHeader = self.view.horizontalHeader()
        self.horizontalHeader.sectionClicked.connect(
            self.on_view_horizontalHeader_sectionClicked
        )

    @QtCore.pyqtSlot(int)
    def on_view_horizontalHeader_sectionClicked(self, logicalIndex):
        menu = QtWidgets.QMenu(self)

        values = []

        for row in range(self.model.rowCount()):
            value = self.model.index(row, logicalIndex).data(self.proxy.filterRole())
            values.append(value)

        action_all = QtWidgets.QAction("All", self)
        action_all.setData(None)
        menu.addAction(action_all)
        menu.addSeparator()

        for value in sorted(list(set(values))):
            action = QtWidgets.QAction(str(value), self)
            action.setData(value)
            menu.addAction(action)

        headerPos = self.view.mapToGlobal(self.horizontalHeader.pos())
        posY = headerPos.y() + self.horizontalHeader.height()
        posX = headerPos.x() + self.horizontalHeader.sectionPosition(logicalIndex)

        action = menu.exec_(QtCore.QPoint(posX, posY))
        if action is not None:
            self.proxy.setFilterKeyColumn(logicalIndex)
            self.proxy.filter_value = action.data()


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    main = myWindow()
    main.show()
    main.resize(400, 600)
    sys.exit(app.exec_())