对QSqlRelationalTableModel所做的更改未写入数据库

Question

我正在通过QSqlRelationalTableModel将SQLite数据库中的行显示到QTreeView中。 编辑策略设置为OnManualSubmit。 我正在编辑对话框中的数据行，并使用setRecord(row_index, record)更新模型-确定。

问题：当我在更改后的QSqlRelationalTableModel上执行SubmitAll（）时，所做的更改未写入SQLite数据库文件中。 即使似乎没有发生SQL错误。

预期结果：我所做的更改应永久存储在SQLite数据库文件中。

注意：在主要部分的第二次运行中，注释掉create_sample_data()的调用。

最小但完整的工作代码示例：

#!/usr/bin/env python3
# coding = utf-8

import sys
import re
from PyQt5 import QtWidgets, QtGui, QtCore, QtSql

db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
db.setDatabaseName("test_2.db");
modelQuery = QtSql.QSqlQueryModel()
modelTable = QtSql.QSqlRelationalTableModel()

class dlgDetail(QtWidgets.QDialog):
    def __init__(self, index, parent):
        QtWidgets.QDialog.__init__(self, parent=None)
        self.setupUi(self)        

        # connect signals
        self.accepted.connect(self.dlgDetail_accepted)        
        self.pbNew.clicked.connect(self.on_my_pbNew_clicked)
        self.pbSave.clicked.connect(self.on_my_pbSave_clicked)
        self.pbDel.clicked.connect(self.on_my_pbDel_clicked)

        # load selected data
        self.row_ix = index.row()
        self.model = parent.treeView.model()        

        ix = self.model.index(self.row_ix, 0)  # column which contains the id        
        self.efId.setText(ix.data())

        ix = self.model.index(self.row_ix, 1)  # column which contains the lastName        
        self.efLastName.setText(ix.data())

        ix = self.model.index(self.row_ix, 2)  # column which contains the firstName        
        self.efFirstName.setText(ix.data())

    def setupUi(self, parent):
        self.setGeometry(300,200,250,200)

        lblId = QtWidgets.QLabel(self)
        lblId.setText("ID:")

        lblLastName = QtWidgets.QLabel(self)
        lblLastName.setText("Last Name:")
        lblLastName.move(0,30)

        lblFirstName = QtWidgets.QLabel(self)
        lblFirstName.setText("First Name:")
        lblFirstName.move(0,60)

        self.efId = QtWidgets.QLineEdit(self)
        self.efId.move(100,0)

        self.efLastName = QtWidgets.QLineEdit(self)
        self.efLastName.move(100,30)

        self.efFirstName = QtWidgets.QLineEdit(self)
        self.efFirstName.move(100,60)

        self.pbNew = QtWidgets.QPushButton("New", self)
        self.pbNew.move(0,150)

        self.pbSave = QtWidgets.QPushButton("Save", self)
        self.pbSave.move(75,150)

        self.pbDel = QtWidgets.QPushButton("Del", self)
        self.pbDel.move(150,150)

    def dlgDetail_accepted(self):

        record = modelTable.record()
        record.setGenerated(self.row_ix, False)
        record.setValue("persId", self.efId.text())
        record.setValue("lastName", self.efLastName.text())
        record.setValue("firstName", self.efFirstName.text())        

        # Update Database               
        if not modelTable.submitAll():
            print("Update Database - Error: ", modelTable.lastError().text())
        else:
            print("Update Database - Success.")

        # Update Model
        modelTable.setRecord(self.row_ix, record)         

    def on_my_pbSave_clicked(self):
        self.dlgDetail_accepted()                
        self.close()

    def on_my_pbNew_clicked(self):
        pass

    def on_my_pbDel_clicked(self):
        pass    

class winMain(QtWidgets.QMainWindow):
    def __init__(self, parent=None):        
        super().__init__(parent)                
        self.setupUi()
        self.setGeometry(300,200,700,500)

        self.treeView.doubleClicked.connect(self.OnEditData)
        self.show()

    def OnEditData(self, index):
        dlg_detail = dlgDetail(index, self)
        dlg_detail.exec_()

    def setupUi(self):
        self.centralwidget = QtWidgets.QWidget(self)
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.centralwidget)

        self.treeView = QtWidgets.QTreeView(self.centralwidget)

        self.treeView.setRootIsDecorated(False)
        self.treeView.setSortingEnabled(True)
        self.treeView.setAlternatingRowColors(True)        
        self.treeView.setEditTriggers(QtWidgets.QAbstractItemView.NoEditTriggers)
        self.treeView.setSelectionMode(QtWidgets.QAbstractItemView.ExtendedSelection)
        self.treeView.header().setStretchLastSection(True)

        self.horizontalLayout.addWidget(self.treeView)
        self.setCentralWidget(self.centralwidget)

        modelTable.setTable("person")
        modelTable.setRelation(3, QtSql.QSqlRelation("country", "id", "name"));
        modelTable.setEditStrategy(QtSql.QSqlTableModel.OnManualSubmit)

        modelTable.select()                

        modelTable.setHeaderData(0, QtCore.Qt.Horizontal, "ID");
        modelTable.setHeaderData(1, QtCore.Qt.Horizontal, "Last Name");
        modelTable.setHeaderData(2, QtCore.Qt.Horizontal, "First Name");
        modelTable.setHeaderData(3, QtCore.Qt.Horizontal, "Country");

        self.treeView.setModel(modelTable)                

def create_sample_data():
    # create tables for our model
    modelQuery.setQuery("""CREATE TABLE IF NOT EXISTS country (
                                    id   INTEGER PRIMARY KEY UNIQUE,
                                    name TEXT
                                    )""")

    modelQuery.setQuery("""CREATE TABLE IF NOT EXISTS person (
                                   persId     TEXT,
                                   lastName   TEXT,
                                   firstName  TEXT,
                                   country_id INTEGER,
              FOREIGN KEY (country_id) REFERENCES country(id)
                                   )""")

    # create some sample data for our model    
    modelQuery.setQuery("INSERT INTO country (id, name) VALUES (1, 'Angola')")    
    modelQuery.setQuery("INSERT INTO country (id, name) VALUES (2, 'Serbia')")
    modelQuery.setQuery("INSERT INTO country (id, name) VALUES (3, 'Georgia')")    
    modelQuery.setQuery("INSERT INTO person (persId, lastName, firstName, country_id) VALUES ('1001', 'Martin', 'Robert', 1)")
    modelQuery.setQuery("INSERT INTO person (persId, lastName, firstName, country_id) VALUES ('1002', 'Smith', 'Brad', 2)")
    modelQuery.setQuery("INSERT INTO person (persId, lastName, firstName, country_id) VALUES ('1003', 'Smith', 'Angelina', 3)")

if __name__ == '__main__':                         
    app = QtWidgets.QApplication(sys.argv)

    # comment the following call in, on the 2nd run:
    create_sample_data()    

    window = winMain()    
    sys.exit(app.exec_())