pyqt表格实现增删改查

在 PyQt 中，可以使用 QTableWidget 或者 QTableView 控件来实现表格的增删改查功能。下面给出一个简单的示例代码：

from PyQt5.QtWidgets import QApplication, QMainWindow, QTableWidget, QTableWidgetItem, QVBoxLayout, QWidget, QPushButton, QHBoxLayout, QLineEdit, QLabel

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("Table Example")

        self.table_widget = QTableWidget()
        self.table_widget.setRowCount(5)
        self.table_widget.setColumnCount(3)

        self.table_widget.setItem(0, 0, QTableWidgetItem("John"))
        self.table_widget.setItem(0, 1, QTableWidgetItem("Doe"))
        self.table_widget.setItem(0, 2, QTableWidgetItem("john.doe@gmail.com"))

        self.table_widget.setItem(1, 0, QTableWidgetItem("Jane"))
        self.table_widget.setItem(1, 1, QTableWidgetItem("Doe"))
        self.table_widget.setItem(1, 2, QTableWidgetItem("jane.doe@gmail.com"))

        self.table_widget.setHorizontalHeaderLabels(["First Name", "Last Name", "Email"])

        # Add buttons
        add_button = QPushButton("Add")
        add_button.clicked.connect(self.add_row)

        delete_button = QPushButton("Delete")
        delete_button.clicked.connect(self.delete_row)

        update_button = QPushButton("Update")
        update_button.clicked.connect(self.update_row)

        # Add input fields
        self.first_name_input = QLineEdit()
        self.last_name_input = QLineEdit()
        self.email_input = QLineEdit()

        add_layout = QHBoxLayout()
        add_layout.addWidget(QLabel("First Name"))
        add_layout.addWidget(self.first_name_input)
        add_layout.addWidget(QLabel("Last Name"))
        add_layout.addWidget(self.last_name_input)
        add_layout.addWidget(QLabel("Email"))
        add_layout.addWidget(self.email_input)
        add_layout.addWidget(add_button)

        # Add layout to widget
        widget = QWidget()
        main_layout = QVBoxLayout()
        main_layout.addWidget(self.table_widget)
        main_layout.addLayout(add_layout)
        main_layout.addWidget(delete_button)
        main_layout.addWidget(update_button)
        widget.setLayout(main_layout)
        self.setCentralWidget(widget)

    def add_row(self):
        row_count = self.table_widget.rowCount()
        self.table_widget.setRowCount(row_count + 1)

        first_name = self.first_name_input.text()
        last_name = self.last_name_input.text()
        email = self.email_input.text()

        self.table_widget.setItem(row_count, 0, QTableWidgetItem(first_name))
        self.table_widget.setItem(row_count, 1, QTableWidgetItem(last_name))
        self.table_widget.setItem(row_count, 2, QTableWidgetItem(email))

        self.first_name_input.clear()
        self.last_name_input.clear()
        self.email_input.clear()

    def delete_row(self):
        selected_row = self.table_widget.currentRow()
        if selected_row != -1:
            self.table_widget.removeRow(selected_row)

    def update_row(self):
        selected_row = self.table_widget.currentRow()
        if selected_row != -1:
            first_name = self.first_name_input.text()
            last_name = self.last_name_input.text()
            email = self.email_input.text()

            self.table_widget.setItem(selected_row, 0, QTableWidgetItem(first_name))
            self.table_widget.setItem(selected_row, 1, QTableWidgetItem(last_name))
            self.table_widget.setItem(selected_row, 2, QTableWidgetItem(email))

            self.first_name_input.clear()
            self.last_name_input.clear()
            self.email_input.clear()

if __name__ == "__main__":
    app = QApplication([])
    window = MainWindow()
    window.show()
    app.exec_()

该示例代码中实现了一个简单的表格，可以添加、删除和更新表格中的行。用户可以通过输入框输入数据，并点击相应的按钮来实现增删改查操作。在该示例中，使用了 QTableWidget 控件来展示表格数据，并添加了 QLineEdit、QLabel 和 QPushButton 等控件来实现用户交互。