Type

Question

我有两个表。

            Table "public.part"
      Column       |          Type          |
-------------------+------------------------+
 id                | bigint                 | 
 part_name         | character varying(255) |
 part_department   | character varying(255) |
 part_manufacturer | character varying(255) | 
 part_model        | character varying(255) |
 part_category     | character varying(255) | 
 part_storage      | character varying(255) | 
 part_description  | character varying(255) | 
 part_stocklimit   | smallint               | 


     Table "public.entry"
     Column     |          Type          |
----------------+------------------------+
 id             | bigint                 | 
 part_id        | bigint                 |
 entry_status   | character(5)           |
 entry_qty      | smallint               |
 entry_desc     | character varying(500) |
 entry_date     | date                   |
 entry_employee | character varying(225)

我想在entry TABLE中插入数据。entry TABLE中的part_id是part TABLE中id的FOREIGN KEY。

我使用PyQt5建立了一个from来插入条目TABLE的值，并使用psycopg2在python中运行psql命令，它看起来像这样。

名称标签有combobox，它从part TABLE中获取部件列表。现在我想从comboBox中插入与部件TABLE中id匹配的数据。所以让我们说像这样

INSERT INTO entry (part_id, entry_status, entry_qty, entry_desc, entry_date, entry_employee) VALUES
( SELECT id FROM part WHERE part_name=entry_part_name, entry_status, entry_qty, entry_desc, entry_date, entry_employee );

现在我已经在python中找出了标准的INSERT语句，它看起来是这样的，但我不知道如何匹配零件的id，使它能够插入id而不是零件名称。但我不知道如何匹配零件的id，使其能够插入id而不是零件名称。

    def AddEntry_Data(self):
    self.db = ConnectDatabase()
    entry_part_name = self.comboBoxNewEntryPart.currentText()
    entry_employee = self.comboBoxNewEntryEmployee.currentText()
    entry_status = self.comboBoxNewEntryStatus.currentText()
    entry_quantity = self.spinBoxNewEntryQuantity.value()
    entry_description = self.lineNewEntryDescription.toPlainText()
    entry_date = self.dateNewEntryDate.text()

    try:
        self.cur = self.db.cursor()
        self.cur.execute('SAVEPOINT SP1')
        self.cur.execute('''INSERT INTO entry (part_id, entry_status, entry_qty, entry_desc, entry_date, entry_employee) 
                                            VALUES (%s , %s , %s , %s , %s , %s , %s , %s)''', (entry_part_name, entry_status, entry_quantity, entry_description, entry_date, entry_employee))
    except Exception as error:
        self.cur.execute('ROLLBACK TO SAVEPOINT SP1')
        self.AddEntry_reset()
        print(error)
        # self.error_popup("Input Error", error)
    else:
        self.cur.execute('RELEASE SAVEPOINT SP1')
        self.db.commit()
        self.AddEntry_reset()
        self.success_popup("Entry", "New Entry Added.")
    self.db.close

我能想到的方法之一是选择查询id并存储在一个变量中，然后将该变量传递给insert查询。

        try:
        self.cur = self.db.cursor()
        self.cur.execute('SAVEPOINT SP1')
        self.cur.execute('''SELECT id FROM part WHERE part_name = %s ''', [(entry_part_name,)])
    except Exception as error:
        self.cur.execute('ROLLBACK TO SAVEPOINT SP1')
        self.AddEntry_reset()
        self.error_popup("Input Error", error)
    else:
        fetched_part_id = self.cur.fetchone()
        try:
            self.cur.execute('''INSERT INTO entry (fetched_part_id, entry_status, entry_qty, entry_desc, entry_date, entry_employee)
                                                VALUES (%s , %s , %s , %s , %s , %s)''', (fetch_id, entry_status, entry_quantity, entry_description, entry_date, entry_employee))
        except Exception as error:
            self.cur.execute('ROLLBACK TO SAVEPOINT SP1')
            self.AddEntry_reset()
            self.error_popup("Input Error", error)
        else:
            self.cur.execute('RELEASE SAVEPOINT SP1')
            self.db.commit()
            self.AddEntry_reset()
            self.success_popup("Entry", "New Entry Added.")
    self.db.close()

如果有其他简单的方法来结合选择查询内插入查询在python中，像明智的sql命令说在顶部是感激。谢谢你。