如何连接一个sqlite表中的三个字段记录并将其插入到第二个表的一个字段中？

Question

下面是我的示例代码：

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


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.details_tableview = QtWidgets.QTableView(self.centralwidget)
        self.details_tableview.setGeometry(QtCore.QRect(30, 220, 381, 271))
        self.details_tableview.setObjectName("details_tableview")
        self.full_tableview = QtWidgets.QTableView(self.centralwidget)
        self.full_tableview.setGeometry(QtCore.QRect(440, 220, 341, 271))
        self.full_tableview.setObjectName("full_tableview")
        self.title_combo = QtWidgets.QComboBox(self.centralwidget)
        self.title_combo.setGeometry(QtCore.QRect(164, 41, 69, 20))
        self.title_combo.setObjectName("title_combo")
        self.title_combo.addItem("")
        self.title_combo.setItemText(0, "")
        self.title_combo.addItem("")
        self.title_combo.addItem("")
        self.save_btn = QtWidgets.QPushButton(self.centralwidget)
        self.save_btn.setGeometry(QtCore.QRect(100, 180, 75, 23))
        self.save_btn.setObjectName("save_btn")
        self.first_name_line = QtWidgets.QLineEdit(self.centralwidget)
        self.first_name_line.setGeometry(QtCore.QRect(164, 67, 133, 20))
        self.first_name_line.setObjectName("first_name_line")
        self.lastNameLabel = QtWidgets.QLabel(self.centralwidget)
        self.lastNameLabel.setGeometry(QtCore.QRect(102, 93, 50, 16))
        self.lastNameLabel.setObjectName("lastNameLabel")
        self.last_name_line = QtWidgets.QLineEdit(self.centralwidget)
        self.last_name_line.setGeometry(QtCore.QRect(164, 93, 133, 20))
        self.last_name_line.setObjectName("last_name_line")
        self.designationLabel = QtWidgets.QLabel(self.centralwidget)
        self.designationLabel.setGeometry(QtCore.QRect(102, 145, 56, 16))
        self.designationLabel.setObjectName("designationLabel")
        self.mobileLabel = QtWidgets.QLabel(self.centralwidget)
        self.mobileLabel.setGeometry(QtCore.QRect(102, 119, 30, 16))
        self.mobileLabel.setObjectName("mobileLabel")
        self.desig_line = QtWidgets.QLineEdit(self.centralwidget)
        self.desig_line.setGeometry(QtCore.QRect(164, 145, 133, 20))
        self.desig_line.setObjectName("desig_line")
        self.mobile_line = QtWidgets.QLineEdit(self.centralwidget)
        self.mobile_line.setGeometry(QtCore.QRect(164, 119, 133, 20))
        self.mobile_line.setObjectName("mobile_line")
        self.firstNameLabel = QtWidgets.QLabel(self.centralwidget)
        self.firstNameLabel.setGeometry(QtCore.QRect(102, 67, 51, 16))
        self.firstNameLabel.setObjectName("firstNameLabel")
        self.tilteLabel = QtWidgets.QLabel(self.centralwidget)
        self.tilteLabel.setGeometry(QtCore.QRect(102, 41, 20, 16))
        self.tilteLabel.setObjectName("tilteLabel")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.mobile_line.setValidator(QIntValidator())
        self.save_btn.clicked.connect(self.save_data)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
        db.setDatabaseName("employee.db")
        if db.open():
            query = QSqlQuery()
            query.exec_("CREATE TABLE IF NOT EXISTS details(title TEXT, first_name TEXT, last_name TEXT, mobile TEXT, designation TEXT)")
            query.exec_("CREATE TABLE IF NOT EXISTS view(full name TEXT, mobile TEXT, designation TEXT)")

        self.emp_model = QtSql.QSqlTableModel()
        self.emp_model.setTable("details")
        self.emp_model.select()
        self.details_tableview.setModel(self.emp_model)

        self.view_model = QtSql.QSqlTableModel()
        self.view_model.setTable("view")
        self.view_model.select()
        self.full_tableview.setModel(self.view_model)


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.title_combo.setItemText(1, _translate("MainWindow", "Mr."))
        self.title_combo.setItemText(2, _translate("MainWindow", "Ms."))
        self.save_btn.setText(_translate("MainWindow", "Save"))
        self.lastNameLabel.setText(_translate("MainWindow", "Last Name"))
        self.designationLabel.setText(_translate("MainWindow", "Designation"))
        self.mobileLabel.setText(_translate("MainWindow", "Mobile"))
        self.firstNameLabel.setText(_translate("MainWindow", "First Name"))
        self.tilteLabel.setText(_translate("MainWindow", "Tilte"))

    def save_data(self):
        data_ = [self.title_combo.currentText(), self.first_name_line.text(), self.last_name_line.text(), self.mobile_line.text(), self.desig_line.text()]
        print(data_)
        r = self.emp_model.record()
        r.setValue("title", self.title_combo.currentText())
        r.setValue("first_name", self.first_name_line.text())
        r.setValue("last_name", self.last_name_line.text())
        r.setValue("mobile", self.mobile_line.text())
        r.setValue("designation", self.desig_line.text())
        
        self.emp_model.insertRecord(-1, r)
        self.emp_model.select()
        
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

我正在使用 QtSql.QSqlTableModel、QSqlQuery()、QTableView。 是否可以将所需列数据从一个表连接到第二个表列。例如，在第一个表中有五列，我需要将“title”、“First name”和“last name”连接为“full name”，并且应该将其作为“full name”列插入到第二个表中.并且需要将第一个表中的“mobile”列值插入到第二个表的“mobile”列中，并将第一个表中的“Designation”列插入到第二个表的“designation”列中。如果可以，怎么办？如果有任何解决方案会有所帮助。 请查找图片以供参考。

Answer 1

如果您想在表的行之间创建绑定，那么可能的解决方案是创建触发器，在修改（插入、更新或删除）表之前修改另一个表。

from PyQt5 import QtWidgets, QtSql

queries = (
    """
CREATE TABLE IF NOT EXISTS details(
    title TEXT, 
    first_name TEXT, 
    last_name TEXT, 
    mobile TEXT, 
    designation TEXT
)""",
    """
CREATE TABLE IF NOT EXISTS view(
    full name TEXT, 
    mobile TEXT, 
    designation TEXT)
""",
    """
CREATE TRIGGER IF NOT EXISTS after_insert_details 
   AFTER INSERT 
   ON details
BEGIN
    INSERT INTO view(full, mobile, designation)
         VALUES(NEW.first_name || " " ||New.last_name , NEW.mobile, NEW.designation);
END;""",
    """
CREATE TRIGGER IF NOT EXISTS after_update_details 
   AFTER UPDATE 
   ON details
BEGIN
    UPDATE view
     SET full = NEW.first_name || " " ||New.last_name , mobile = NEW.mobile, designation = NEW.designation
     WHERE NEW.rowid = rowid;
END;
""",
"""
CREATE TRIGGER IF NOT EXISTS after_delete_details 
    AFTER DELETE 
    ON details
BEGIN 
    DELETE FROM view 
    WHERE OLD.rowid = rowid;
END;
"""
)


def create_connection():
    db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
    db.setDatabaseName("employee.db")
    if not db.open():
        print(db.lastError().text())
        return False
    return True


class ReadOnlyDelegate(QtWidgets.QStyledItemDelegate):
    def createEditor(self, parent, option, index):
        pass


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)

        self.title_combo = QtWidgets.QComboBox()
        self.title_combo.addItems(["Mr.", "Ms."])
        self.first_name_line = QtWidgets.QLineEdit()
        self.last_name_line = QtWidgets.QLineEdit()
        self.mobile_line = QtWidgets.QLineEdit()
        self.desig_line = QtWidgets.QLineEdit()

        self.save_btn = QtWidgets.QPushButton("Save")

        self.detail_view = QtWidgets.QTableView()
        self.detail_model = QtSql.QSqlTableModel()
        self.detail_model.setTable("details")
        self.detail_model.select()
        self.detail_view.setModel(self.detail_model)

        self.table_view = QtWidgets.QTableView()
        self.view_model = QtSql.QSqlTableModel()
        self.view_model.setTable("view")
        self.view_model.select()
        self.table_view.setModel(self.view_model)
        self.table_view.setItemDelegate(ReadOnlyDelegate(self.table_view))

        form_widget = QtWidgets.QWidget()
        form_layout = QtWidgets.QFormLayout(form_widget)
        form_layout.addRow("Title", self.title_combo)
        form_layout.addRow("First Name", self.first_name_line)
        form_layout.addRow("Last Name", self.last_name_line)
        form_layout.addRow("Mobile", self.mobile_line)
        form_layout.addRow("Designation", self.desig_line)
        form_layout.addRow(self.save_btn)
        form_widget.setFixedSize(form_widget.sizeHint())

        central_widget = QtWidgets.QWidget()
        self.setCentralWidget(central_widget)

        hlay1 = QtWidgets.QHBoxLayout()
        hlay1.addWidget(form_widget)
        hlay1.addStretch()

        hlay2 = QtWidgets.QHBoxLayout()
        hlay2.addWidget(self.detail_view)
        hlay2.addWidget(self.table_view)

        vboxlayout = QtWidgets.QVBoxLayout(central_widget)
        vboxlayout.addLayout(hlay1)
        vboxlayout.addLayout(hlay2)

        self.resize(640, 480)

        self.save_btn.clicked.connect(self.insert_row)

    def insert_row(self):
        r = self.detail_model.record()
        r.setValue("title", self.title_combo.currentText())
        r.setValue("first_name", self.first_name_line.text())
        r.setValue("last_name", self.last_name_line.text())
        r.setValue("mobile", self.mobile_line.text())
        r.setValue("designation", self.desig_line.text())
        self.detail_model.insertRecord(-1, r)
        self.detail_model.select()
        self.view_model.select()


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    if not create_connection():
        sys.exit(-1)
    for query_str in queries:
        query = QtSql.QSqlQuery(query_str)
        if not query.exec_():
            print(query.lastError().text())
    w = MainWindow()
    w.show()
    sys.exit(app.exec_())