SQLITE3-如何根据输入的数据自动检测数据库中的表？

Question

我正在设置一个函数，以添加将要输入到数据库中8个“物料表”之一上的新数据行。

def Add_New(self):
    pref = self.adding.addcode_text.text()
    grade = self.adding.addgrade_text.text()
    desc = self.adding.adddesc_text.text()
    supp = self.adding.addsupp_text.text()
    try:
        c.execute('INSERT INTO ***auto detected table*** (prefix,grade,desc1,supplier)VALUES(?,?,?,?)',(pref,grade,desc,supp))
        conn.commit()
        print('DONE')
        self.Load_***Auto detected***Db()
    except Exception as error:
        print(error)

我不确定如何根据用户的“ Pref”条目自动检测将新数据放入哪个表。 Pref是唯一的3位数代码。每个表都有分配的值的范围....即表1的3位代码均以``1''开头。表2中的3位代码均以“ 2”等开头。

我需要if语句来处理吗？如果第一个数字为1，则在数据库中选择表1进行存储？或者我可以通过让它标识currentwidget及其指向的内容来将其指向正确的表？

我会将功能分配给按钮以触发事件。

为新手道歉的问题是我在编程的第一周就开始使用了，并且真的可以使用大家提供的任何帮助。

物料数据库返回到tablewidgets：

import sqlite3
from mcnc import Ui_MainWindow
import mcnclogo_rc
from PyQt5 import QtCore,QtGui
from PyQt5.QtWidgets import QApplication,QMainWindow,QTableWidgetItem
import sys

conn = sqlite3.connect('codes.db')
c = conn.cursor()
c.execute('')

class MainApp(QMainWindow, Ui_MainWindow):
    def __init__(self,parent=None):
        super(MainApp,self).__init__(parent)

        self.setupUi(self)
        self.Load_StainlessDb()
        self.Load_SteelDb()
        self.Load_aluminiumDb()
        self.Load_plasticDb()
        self.Load_miscDb()
        self.Load_duplexDb()
        self.Load_consumablesDb()
        self.Load_freeIssueDb()

    def Load_StainlessDb(self):
        content = 'SELECT * FROM stainless'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_9.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_9.setItem(row_index, column_index,         
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_SteelDb(self):
        content = 'SELECT * FROM steel'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_2.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_2.setItem(row_index, column_index,     
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_aluminiumDb(self):
        content = 'SELECT * FROM aluminium'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_3.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_3.setItem(row_index, column_index,     
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_plasticDb(self):
        content = 'SELECT * FROM plastic'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_4.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_4.setItem(row_index, column_index, 
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_miscDb(self):
        content = 'SELECT * FROM misc'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_5.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_5.setItem(row_index, column_index, 
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_duplexDb(self):
        content = 'SELECT * FROM duplex'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_6.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_6.setItem(row_index, column_index,     
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_consumablesDb(self):
        content = 'SELECT * FROM consumables'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_7.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_7.setItem(row_index, column_index, 
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Load_freeIssueDb(self):
        content = 'SELECT * FROM freeIssue'
        res = conn.execute(content)
        for row_index, row_data in enumerate(res):
            self.tableWidget_8.insertRow(row_index)
            for column_index, column_data in enumerate(row_data):
                self.tableWidget_8.setItem(row_index, column_index, 
                QTableWidgetItem(str(column_data)))
        conn.close
        return

    def Add_New(self):
        pref = self.adding.addcode_text.text()
        grade = self.adding.addgrade_text.text()
        desc = self.adding.adddesc_text.text()
        supp = self.adding.addsupp_text.text()
        try:
            c.execute('INSERT INTO t     
            (prefix,grade,desc1,supplier)VALUES(?,?,?,?)', 
            (pref,grade,desc,supp))
            conn.commit()
            print('DONE')
            self.Load_freeIssueDb()
        except Exception as error:
        print(error)

if __name__=="__main__":
    app = QApplication(sys.argv)
    w = MainApp()
    w.show()
    sys.exit(app.exec_())

这里是代码，对表名进行了必要的更改...

def Add_New(self):
    pref = self.adding.addcode_text.text()
    grade = self.adding.addgrade_text.text()
    desc = self.adding.adddesc_text.text()
    supp = self.adding.addsupp_text.text()
    tables = {"1": "Stainless", "2": "Steel", "3": "Aluminium", "4": 
    "Plastic", "5": "misc", "6": "duplex", "8": "consumables", "9": 
    "freeIssue" }
    table = tables[pref[0]]
try:
    c.execute('INSERT INTO ' + table + ' 
    (prefix,grade,desc1,supplier)VALUES(?,?,?,?)',(pref,grade,desc,supp))
    conn.commit()
    print('DONE')
    getattr(self, 'Load_' + table + 'Db')()
except Exception as error:
    print(error)

这也是buttonWidget connect语句...

self.ui = MainApp()
    self.ui.pushButton_3.clicked.connect(self.Add_New)
    self.show

这就是它在Visual Studio中对我的显示方式...

Code as it appears in visual studio

Answer 1

如果只是确定表的第一位数字，则可以使用字典将数字映射到表名称。

调用Load_XXXDb()方法时，可以使用getattr()动态获取属性。

def Add_New(self):
    pref = self.adding.addcode_text.text()
    grade = self.adding.addgrade_text.text()
    desc = self.adding.adddesc_text.text()
    supp = self.adding.addsupp_text.text()
    tables = {"1": "Stainless", "2": "Steel", "3": "Aluminum", ...}
    table = tables[pref[0]]
    try:
        c.execute('INSERT INTO ' + table + ' (prefix,grade,desc1,supplier)VALUES(?,?,?,?)',(pref,grade,desc,supp))
        conn.commit()
        print('DONE')
        getattr(self, 'Load_' + table + 'Db')()
    except Exception as error:
        print(error)