如何将具有一对多关系的 2 个 SQLite 表显示为一个 QTableWidget [英] How to display 2 SQLite tables with one to many relation into one QTableWidget

问题描述

我在 Db 中有以下两个表，具有一对多的关系:

I have following two tables in Db, with one to many relationship:

self.c.execute("CREATE TABLE IF NOT EXISTS dispatch("
                       "id_dispatch INTEGER PRIMARY KEY AUTOINCREMENT,"
                       "d_date TEXT,"
                       "d_mill TEXT,"
                       "d_buyer TEXT,"
                       "d_addFreight INTEGER,"
                       "d_subFreight INTEGER,"
                       "d_amount INTEGER,"
                       "d_cd INTEGER,"
                       "d_comm INTEGER,"
                       "d_netAmount INTEGER)")
        self.c.execute("CREATE TABLE IF NOT EXISTS dispatch_products("
                       "dispatch_id INTEGER NOT NULL REFERENCES DISPATCH(id_dispatch),"
                       "product INTEGER,"
                       "quantity INTEGER,"
                       "rate INTEGER)")

我正在尝试将这两个表合二为一并显示在一个表中，使用以下代码:

I'm trying to combine these two table into one and display in one table, using following code:

def loadTable(self):
    connection = sqlite3.connect('main_databaseSample.db')
    query = "CREATE VIEW myview as SELECT d_buyer," \
            "d_date, product, quantity, rate, d_amount, d_addFreight, d_subFreight, d_netAmount from " \
            "dispatch, dispatch_products WHERE dispatch.id_dispatch = dispatch_products.dispatch_id"
    query = "SELECT * FROM myview"
    result = connection.execute(query)
    self.tableWidget.setRowCount(0)
    for row_number, row_data in enumerate(result):
        self.tableWidget.insertRow(row_number)
        for column_number, data in enumerate(row_data):
            self.tableWidget.setItem(row_number, column_number,QtWidgets.QTableWidgetItem(str(data)))
    connection.close()

问题:包含多个产品的订单重复出现.如何消除具有一对多关系的多个条目?

PROBLEM: Orders which have multiple products are repeated. How to eliminate multiple entries which have one to many relationship?

样本数据:

dispatch table:
ID date   mill buyer addF subF amount cd comm netAmount
1  15-10  abc  A     0    0    100    0  0    100
2  16-10  xyz  B     0    0    200    0  0    200

dispatch_products table:
Dispatch_ID product qty rate
1           M       40  1
1           A       60  1
2           S       50  4

Code Output:
buyer date  product quantity rate amount addFreight subFreight NetAmount
A     15-10 M       40       1    100    0          0          100
A     15-10 A       60       1    100    0          0          100
B     16-10 S       50       4    200    0          0          200

Expected Output:
buyer date  product quantity rate amount addFreight subFreight NetAmount
A     15-10 M       40       1    100    0          0          100
            A       60       1                           
B     16-10 S       50       4    200    0          0          200

推荐答案

任务是检测是否有相同的元素，我们必须向 View 添加一个元素，dispatch_id 或 id_dispatch 并让它们排序.检测到 dispatch_id 的变化后，使用 setSpan() 加入必要的行，如下所示:

The task is to detect that there are equal elements for it we must add one more element to the View, the dispatch_id or id_dispatch and get them sorted. After detecting the change of dispatch_id join the necessary rows using setSpan() as shown below:

from PyQt5 import QtCore, QtWidgets
import sqlite3

class Widget(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)
        button = QtWidgets.QPushButton("Press me")
        button.clicked.connect(self.load_table)
        self.tableWidget = QtWidgets.QTableWidget()

        lay = QtWidgets.QVBoxLayout(self)
        lay.addWidget(button)
        lay.addWidget(self.tableWidget)

    @QtCore.pyqtSlot()
    def load_table(self):
        self.tableWidget.setRowCount(0)
        self.tableWidget.setColumnCount(9)

        connection = sqlite3.connect('main_databaseSample.db')

        connection.execute("DROP VIEW IF EXISTS myview;")
        query = "CREATE VIEW myview as SELECT dispatch_id, d_buyer," \
            "d_date, product, quantity, rate, d_amount, d_addFreight, d_subFreight, d_netAmount from " \
            "dispatch, dispatch_products WHERE dispatch.id_dispatch = dispatch_products.dispatch_id " \
            "ORDER BY dispatch_id ASC;"
        connection.execute(query)
        query = "SELECT * FROM myview"
        result = connection.execute(query)
        last_id = -1
        start_row = 0
        for row, row_data in enumerate(result):
            self.tableWidget.insertRow(row)
            current_id, *other_values = row_data 
            for col, data in enumerate(other_values):
                it = QtWidgets.QTableWidgetItem(str(data))
                self.tableWidget.setItem(row, col, it)
            if last_id != current_id and last_id != -1:
                self.apply_span(start_row, row - start_row)
                start_row = row
            last_id = current_id
        if start_row != row:
            self.apply_span(start_row, self.tableWidget.rowCount() - start_row)

    def apply_span(self, row, nrow):
        if nrow <= 1:
            return
        for c in (0, 1, 5, 6, 7, 8):
            self.tableWidget.setSpan(row, c, nrow, 1)
            for r in range(row+1, row+nrow):
                t = self.tableWidget.takeItem(r, c)
                del t

if __name__ == '__main__':
    import sys
    app = QtWidgets.QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

添加更多数据我们可以看到如下结果

Adding more data we can see the following result

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