PyQt - 使用 pandas DataFrame 在 QAbstractTableModel (QTableView) 中加载 SQL - 在 GUI 中编辑数据
PyQt - Load SQL in QAbstractTableModel (QTableView) using pandas DataFrame - editing datas in a GUI
我对 python 和使用 WinPython-32bit-2.7.10.3
(包括 QTDesigner 4.8.7
)还很陌生。我正在尝试使用 QtableViews.
编写一个接口,以便在两个独立的项目上使用 sqlite 数据库
算法大致是这样:
- 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
根据用于创建数据框的 sql,我没有得到相同的结果:
给定一个 SQL table "parametres",有 3 个字段(LIBELLE 作为 varchar,VALEUR 作为 varchar,TEST 作为布尔值),尝试的 sql 是:
- 'SELECT LIBELLE AS "Paramètre", VALEUR AS "Valeur" FROM parametres'.编码("utf-8")
- 'SELECT * FROM parametres'.编码("utf-8")
根据第一个请求,我可以编辑 table 视图中的数据。对于第二个请求,我可以 select a "cell" 编辑它,但是当我提交版本(按回车键)时,数据将设置回它的第一个值。
在搜索时,我发现无论 "anything" 值是什么,这行 setData 代码都不起作用:
self._data.values[index.row()][index.column()] = "anything"
您可以通过在主代码中删除第 27 行开头的 # 字符来测试 sql 来源的发生率。
我已将代码截断到最低限度(非常接近我第一个项目的原始工作代码),我感到非常困惑。如果有人有想法,那就太好了!
谢谢
PS : 我post之后的代码,但我还没有找到加入sqlite.db
的方法...如果有人可以指导我,我会很高兴添加它;与此同时,我已经在我的 google.drive
上加入了整个 zip
编辑#2:
仍然不明白那里出了什么问题,但我刚刚发现一旦加载数据,我就无法将数据提交给模型。我很确定这是我问题的核心,随后更新了问题和标题。
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_TO_PYQT.py" 的代码,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,包含对话框源代码:
# -*- 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_())
我终于想通了......但我仍然不知道为什么 pandas 仅通过更改 SQL 请求(必须是 read_sql_query 进程中的某些内容。 ..)
为了让 class 起作用,我必须更改 "PANDAS_TO_PYQT.py" 的代码,替换
self._data.values[index.row()][index.column()]
来自
self._data.iloc[index.row(),index.column()]
在 setData 和数据函数中。
不知何故,pandas 似乎在此过程中生成了数据帧的副本(对于那些寻找解释的人,请转到 the doc)。
因此,将数据帧转换为 QAbstractTableModel 的正确 class 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()
我对 python 和使用 WinPython-32bit-2.7.10.3
(包括 QTDesigner 4.8.7
)还很陌生。我正在尝试使用 QtableViews.
算法大致是这样:
- 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
根据用于创建数据框的 sql,我没有得到相同的结果: 给定一个 SQL table "parametres",有 3 个字段(LIBELLE 作为 varchar,VALEUR 作为 varchar,TEST 作为布尔值),尝试的 sql 是:
- 'SELECT LIBELLE AS "Paramètre", VALEUR AS "Valeur" FROM parametres'.编码("utf-8")
- 'SELECT * FROM parametres'.编码("utf-8")
根据第一个请求,我可以编辑 table 视图中的数据。对于第二个请求,我可以 select a "cell" 编辑它,但是当我提交版本(按回车键)时,数据将设置回它的第一个值。
在搜索时,我发现无论 "anything" 值是什么,这行 setData 代码都不起作用:
self._data.values[index.row()][index.column()] = "anything"
您可以通过在主代码中删除第 27 行开头的 # 字符来测试 sql 来源的发生率。
我已将代码截断到最低限度(非常接近我第一个项目的原始工作代码),我感到非常困惑。如果有人有想法,那就太好了!
谢谢
PS : 我post之后的代码,但我还没有找到加入sqlite.db
的方法...如果有人可以指导我,我会很高兴添加它;与此同时,我已经在我的 google.drive
编辑#2:
仍然不明白那里出了什么问题,但我刚刚发现一旦加载数据,我就无法将数据提交给模型。我很确定这是我问题的核心,随后更新了问题和标题。
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_TO_PYQT.py" 的代码,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,包含对话框源代码:
# -*- 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_())
我终于想通了......但我仍然不知道为什么 pandas 仅通过更改 SQL 请求(必须是 read_sql_query 进程中的某些内容。 ..)
为了让 class 起作用,我必须更改 "PANDAS_TO_PYQT.py" 的代码,替换
self._data.values[index.row()][index.column()]
来自
self._data.iloc[index.row(),index.column()]
在 setData 和数据函数中。
不知何故,pandas 似乎在此过程中生成了数据帧的副本(对于那些寻找解释的人,请转到 the doc)。
因此,将数据帧转换为 QAbstractTableModel 的正确 class 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()