PyQT5：SpinBox值未在qsql中维护

问题描述

正在处理一个项目，我想将spinBox值保存在数据库中..但是代码对我不起作用..

我想要得到的结果：

例如，当将spinBox_1的值更改为5并将spinBox_2的值更改为10时，在程序关闭并重新启动时，它必须保留这些值。

我有两个按钮.. 更改spinBox值然后按按钮1时，应保留这些值 当您按下按钮2时，其他值会出现并可以更改 如果首先重新启动程序，则按下按钮1时，存储的值必须首先显示 按下按钮2时，应在按下按钮2时显示存储的值

请帮帮我

程序：

from PyQt5 import QtCore,QtGui,QtWidgets,QtSql
from PyQt5.QtSql import *
   
def create_connection(database):
    db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
    db.setDatabaseName(database)
    if not db.open():
        print("Cannot open database")
        print(
            "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."
        )
        return False

    query = QtSql.QSqlQuery()
    if not query.exec_(
        """CREATE TABLE IF NOT EXISTS Devices (
    "id" INTEGER PRIMARY KEY AUTOINCREMENT,"floor_id" INTEGER,"spinBox_1" INTEGER,"spinBox_2" INTEGER,FOREIGN KEY(floor_id) REFERENCES Floors(id))"""
    ):
        print(query.lastError().text())
        return False
    return True



class Ui_Form(object):
    def setupUi(self,Form):
        Form.setObjectName("Form")
        Form.resize(267,173)
        self.spinBox_1 = QtWidgets.QSpinBox(Form)
        self.spinBox_1.setGeometry(QtCore.QRect(60,50,42,22))
        self.spinBox_1.setObjectName("spinBox_1")
        self.spinBox_2 = QtWidgets.QSpinBox(Form)
        self.spinBox_2.setGeometry(QtCore.QRect(150,22))
        self.spinBox_2.setObjectName("spinBox_2")
        self.pushButton_1 = QtWidgets.QPushButton(Form)
        self.pushButton_1.setGeometry(QtCore.QRect(40,120,75,23))
        self.pushButton_1.setObjectName("pushButton_1")
        self.pushButton_2 = QtWidgets.QPushButton(Form)
        self.pushButton_2.setGeometry(QtCore.QRect(140,23))
        self.pushButton_2.setObjectName("pushButton_2")
        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)
        
        self.model = QtSql.QSqlQueryModel(Form)
        self.record = self.model.record(0)
        self.spinBox_1.setValue(self.record.value("spinBox_1"))
        self.spinBox_2.setValue(self.record.value("spinBox_2"))

        self.enable = True
# ----------------------------------------------------------------------------------------------
#                             if spinBox value changed
# ----------------------------------------------------------------------------------------------
        self.spinBox_1.valueChanged.connect(self.updateSpinBox_1)
        self.spinBox_2.valueChanged.connect(self.updateSpinBox_2)
# ----------------------------------------------------------------------------------------------
#                             if pushButton clicked
# ----------------------------------------------------------------------------------------------
        self.pushButton_1.clicked.connect(self.value_1)
        self.pushButton_2.clicked.connect(self.value_2)
# ----------------------------------------------------------------------------------------------
# ----------------------------------------------------------------------------------------------

    def updateSpinBox_1(self):
        if self.enable :
            self.record = self.model.record(0)
        else :
            self.record = self.model.record(1)
        self.record.setValue("spinBox_1",self.spinBox_1.value())
        self.spinBox_1.setValue(self.record.value("spinBox_1"))

        print(self.record.value("spinBox_1"))
        print(self.enable)

    def updateSpinBox_2(self):
        if self.enable :
            self.record = self.model.record(0)
        else :
            self.record = self.model.record(1)
        self.record.setValue("spinBox_2",self.spinBox_2.value())
        self.spinBox_2.setValue(self.record.value("spinBox_2"))

        print(self.record.value("spinBox_2"))
        print(self.enable)

    def value_1(self):
        self.enable = True
        self.record = self.model.record(0)
        self.spinBox_1.setValue(self.record.value("spinBox_1"))
        self.spinBox_2.setValue(self.record.value("spinBox_2"))
        return self.enable

    def value_2(self):
        self.enable = False
        self.record = self.model.record(1)
        self.spinBox_1.setValue(self.record.value("spinBox_1"))
        self.spinBox_2.setValue(self.record.value("spinBox_2"))
        return self.enable


# ----------------------------------------------------------------------------------------------
# ----------------------------------------------------------------------------------------------  
    def retranslateUi(self,Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form","Form"))
        self.pushButton_1.setText(_translate("Form","PushButton1"))
        self.pushButton_2.setText(_translate("Form","PushButton2"))


if __name__ == "__main__":
    import sys
    database = "database.db"
    app = QtWidgets.QApplication(sys.argv)
    if not create_connection(database):
        sys.exit(app.exec_())
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

解决方法

首先，您正在使用QSqlQueryModel，它是只读的。附带说明，您从未使用过left join，因此您的代码实际上是行不通的，因为setQuery()的结果是一个空记录。

然后，修改QSqlRecord的值并不意味着数据库将自动更新。

虽然您可以使用普通的QSqlQuery通过标准数据库self.model.record(0)命令更新值，但只要使用了QSqlTableModel，就可以使用QSqlRecord，并且为了更新数据，请调用setRecord() 。请注意，由于某些与模型的编辑方式以及sqlite的工作方式有关的原因，必须将已修改的字段UPDATE标志 设置为{{ 1}}。

generated

_{注意：实践认为，编辑True生成的class Ui_Form(object): def setupUi(self,Form): # ... self.model = QtSql.QSqlTableModel(Form) self.model.setTable('Devices') self.model.select() self.record = self.model.record(0) # ... def updateSpinBox_1(self): row = 0 if self.enable else 1 self.record = self.model.record(row) self.record.setValue("spinBox_1",self.spinBox_1.value()) self.spinBox_1.setValue(self.record.value("spinBox_1")) self.record.setGenerated('spinBox_1',True) self.model.setRecord(row,self.record) 文件以创建程序被认为是坏做法，因为这些文件应该从不被修改；您也不应尝试模仿它们的行为，因为它们的结构仅对它们的内部用法有意义（使用python的ui文件），并且最好使用QWidget子类从代码创建UI。阅读有关using Designer的官方指南的更多信息。}