Python PyQt-使用pandas数据帧在QabStretctTableModel（QTableView）中加载SQL-在GUI中编辑数据

我对python非常陌生，使用WinPython-32bit-2.7.10.3，包括QTDesigner 4.8.7。我正在尝试编程一个接口，以便在两个单独的项目上使用sqlite数据库，使用QTableView

算法大致如下： -连接到数据库并将数据转换为pandas.DataFrame -将DataFrame转换为QAbstractTableModel -将QAbstractTableModel应用于tableview.model -加载对话框

我没有得到相同的组件，这取决于用于创建数据帧的sql： 给定一个SQL表参数，其中3个字段LIBELLE为varchar，VALEUR为varchar，TEST为boolean，尝试的SQL为：

“选择LIBELLE作为参数，选择VALEUR作为参数中的VALEUR”。编码UTF-8 “从参数中选择*”。编码UTF-8 通过第一个请求，我可以编辑tableview中的数据。对于第二个请求，我可以选择一个单元格，编辑它，但当我按enter键提交编辑时，数据会被设置回它的第一个值

在搜索过程中，我发现这行setData代码不起作用，不管值是什么：

self._data.values[index.row()][index.column()] = "anything"

您可以通过删除主代码第27行开头的字符来测试sql源的关联性

我已经将代码截短到严格的最小值，非常接近我第一个项目的原始工作代码，我感到非常困惑。如果有人有主意，那就太好了

谢谢

PS：我后来发布了代码，但我还没有找到加入sqlite.db的方法。。。如果有人能给我指点，我很乐意补充一句；同时，我也加入了我的团队

编辑2：

仍然无法理解哪里出了问题，但我刚刚发现，一旦加载了数据，就无法将其提交到模型。我很确定这是我问题的核心，随后我更新了问题和标题

主要代码：

#­*­coding: utf­8 ­*­

from PyQt4 import QtCore, QtGui

import os,sys
from parametrage import Ui_WinParam
from PANDAS_TO_PYQT import PandasModel

import pandas as pd
import sqlite3

class window_parametreur(QtGui.QDialog, Ui_WinParam):
    def __init__(self, dataframemodel, parent=None):        
        QtGui.QDialog.__init__(self, parent)
        # Set up the user interface from Designer.
        self.ui = Ui_WinParam()
        self.ui.setupUi(self)
        self.setModal(True)        
        self.ui.tableView.setModel(dataframemodel)
        self.ui.tableView.resizeColumnsToContents()

def OpenParametreur(self, db_path):

    #connecting to database and getting datas as pandas.dataframe
    con = sqlite3.connect(db_path)
    strSQL = u'SELECT LIBELLE AS "Paramètre", VALEUR AS "Valeur" FROM parametres'.encode("utf-8")
    #strSQL = u'SELECT * FROM parametres'.encode("utf-8")
    data = pd.read_sql_query(strSQL, con)
    con.close()

    #converting to QtCore.QAbstractTableModel
    model = PandasModel(data)

    #loading dialog
    self.f=window_parametreur(model)   
    self.f.exec_()

if __name__=="__main__":
    a=QtGui.QApplication(sys.argv)
    f=QtGui.QMainWindow()
    print OpenParametreur(f, ".\SQLiteDataBase.db")

PANDAS_到_PYQT.py的代码，being被调用以将PANDAS.dataframe转换为QtCore.QAbstractTableModel

#­*­coding: utf­8 ­*­

from PyQt4 import QtCore, QtGui

class PandasModel(QtCore.QAbstractTableModel):
    def __init__(self, data, parent=None):
        QtCore.QAbstractTableModel.__init__(self, parent)
        self._data = data

    def rowCount(self, parent=None):
        return len(self._data.values)

    def columnCount(self, parent=None):
        return self._data.columns.size

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if index.isValid():
            if role == QtCore.Qt.DisplayRole or role == QtCore.Qt.EditRole:
                return QtCore.QVariant(unicode(
                    self._data.values[index.row()][index.column()]))
        return QtCore.QVariant()

    def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
        if role != QtCore.Qt.DisplayRole:
            return None
        if orientation == QtCore.Qt.Horizontal:
            try:
                return '%s' % unicode(self._data.columns.tolist()[section], encoding="utf-8")
            except (IndexError, ):
                return QtCore.QVariant()
        elif orientation == QtCore.Qt.Vertical:
            try:
                return '%s' % self._data.index.tolist()[section]
            except (IndexError, ):
                return QtCore.QVariant()

    def flags(self, index):
        return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEditable

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        if index.isValid():

            print "data set with keyboard : " + value.toByteArray().data().decode("latin1")
            self._data.values[index.row()][index.column()] = "anything"
            print "data committed : " +self._data.values[index.row()][index.column()]

            self.dataChanged.emit(index, index)
            return True
        return QtCore.QVariant()

parametrage.py的代码，由QtDesigner创建，包含对话框源：

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'parametrage.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_WinParam(object):
    def setupUi(self, WinParam):
        WinParam.setObjectName(_fromUtf8("WinParam"))
        WinParam.resize(608, 279)
        icon = QtGui.QIcon()
        icon.addPixmap(QtGui.QPixmap(_fromUtf8("../../pictures/EAUX.png")), QtGui.QIcon.Normal, QtGui.QIcon.Off)
        WinParam.setWindowIcon(icon)
        self.gridLayout = QtGui.QGridLayout(WinParam)
        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
        self.ButtonBox = QtGui.QDialogButtonBox(WinParam)
        self.ButtonBox.setOrientation(QtCore.Qt.Horizontal)
        self.ButtonBox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
        self.ButtonBox.setCenterButtons(True)
        self.ButtonBox.setObjectName(_fromUtf8("ButtonBox"))
        self.gridLayout.addWidget(self.ButtonBox, 1, 0, 1, 1)
        self.tableView = QtGui.QTableView(WinParam)
        self.tableView.setEditTriggers(QtGui.QAbstractItemView.DoubleClicked)
        self.tableView.setSortingEnabled(False)
        self.tableView.setObjectName(_fromUtf8("tableView"))
        self.gridLayout.addWidget(self.tableView, 0, 0, 1, 1)

        self.retranslateUi(WinParam)
        QtCore.QObject.connect(self.ButtonBox, QtCore.SIGNAL(_fromUtf8("accepted()")), WinParam.accept)
        QtCore.QObject.connect(self.ButtonBox, QtCore.SIGNAL(_fromUtf8("rejected()")), WinParam.reject)
        QtCore.QMetaObject.connectSlotsByName(WinParam)

    def retranslateUi(self, WinParam):
        WinParam.setWindowTitle(_translate("WinParam", "Paramétrage", None))


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    WinParam = QtGui.QDialog()
    ui = Ui_WinParam()
    ui.setupUi(WinParam)
    WinParam.show()
    sys.exit(app.exec_())

---

我终于明白了。。。但我仍然不知道为什么pandas的工作方式有所不同，仅仅是更改SQL请求必须是read\u SQL\u查询过程中的某些内容

为了让类正常工作，我必须将PANDAS_的代码更改为_PYQT.py，替换

self._data.values[index.row()][index.column()]

借

在setData和data函数中

不知何故，熊猫似乎在寻找解释的过程中产生了一个数据帧副本，请转到

因此，将数据帧转换为QAbstractTableModel的正确类代码为：

#­*­coding: utf­8 ­*­

from PyQt4 import QtCore, QtGui

class PandasModel(QtCore.QAbstractTableModel):
    def __init__(self, data, parent=None):
        QtCore.QAbstractTableModel.__init__(self, parent)
        self._data = data

    def rowCount(self, parent=None):
        return len(self._data.values)

    def columnCount(self, parent=None):
        return self._data.columns.size

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if index.isValid():
            if role == QtCore.Qt.DisplayRole or role == QtCore.Qt.EditRole:
                return QtCore.QVariant(unicode(
                    self._data.iloc[index.row(),index.column()]))
        return QtCore.QVariant()

    def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
        if role != QtCore.Qt.DisplayRole:
            return None
        if orientation == QtCore.Qt.Horizontal:
            try:
                return '%s' % unicode(self._data.columns.tolist()[section], encoding="utf-8")
            except (IndexError, ):
                return QtCore.QVariant()
        elif orientation == QtCore.Qt.Vertical:
            try:
                return '%s' % self._data.index.tolist()[section]
            except (IndexError, ):
                return QtCore.QVariant()

    def flags(self, index):
        return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEditable

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        if index.isValid():
            self._data.iloc[index.row(),index.column()] = value.toByteArray().data().decode("latin1")
            if self.data(index,QtCore.Qt.DisplayRole) == value.toByteArray().data().decode("latin1"):
                self.dataChanged.emit(index, index)
                return True
        return QtCore.QVariant()

#­*­coding: utf­8 ­*­

from PyQt4 import QtCore, QtGui

class PandasModel(QtCore.QAbstractTableModel):
    def __init__(self, data, parent=None):
        QtCore.QAbstractTableModel.__init__(self, parent)
        self._data = data

    def rowCount(self, parent=None):
        return len(self._data.values)

    def columnCount(self, parent=None):
        return self._data.columns.size

    def data(self, index, role=QtCore.Qt.DisplayRole):
        if index.isValid():
            if role == QtCore.Qt.DisplayRole or role == QtCore.Qt.EditRole:
                return QtCore.QVariant(unicode(
                    self._data.iloc[index.row(),index.column()]))
        return QtCore.QVariant()

    def headerData(self, section, orientation, role=QtCore.Qt.DisplayRole):
        if role != QtCore.Qt.DisplayRole:
            return None
        if orientation == QtCore.Qt.Horizontal:
            try:
                return '%s' % unicode(self._data.columns.tolist()[section], encoding="utf-8")
            except (IndexError, ):
                return QtCore.QVariant()
        elif orientation == QtCore.Qt.Vertical:
            try:
                return '%s' % self._data.index.tolist()[section]
            except (IndexError, ):
                return QtCore.QVariant()

    def flags(self, index):
        return QtCore.Qt.ItemIsEnabled | QtCore.Qt.ItemIsSelectable | QtCore.Qt.ItemIsEditable

    def setData(self, index, value, role=QtCore.Qt.EditRole):
        if index.isValid():
            self._data.iloc[index.row(),index.column()] = value.toByteArray().data().decode("latin1")
            if self.data(index,QtCore.Qt.DisplayRole) == value.toByteArray().data().decode("latin1"):
                self.dataChanged.emit(index, index)
                return True
        return QtCore.QVariant()