RError.com

RError.com Logo RError.com Logo

RError.com Navigation

  • 主页

Mobile menu

Close
  • 主页
  • 系统&网络
    • 热门问题
    • 最新问题
    • 标签
  • Ubuntu
    • 热门问题
    • 最新问题
    • 标签
  • 帮助
主页 / 问题 / 1330610
Accepted
Konstantin
Konstantin
Asked:2022-09-21 17:17:25 +0000 UTC2022-09-21 17:17:25 +0000 UTC 2022-09-21 17:17:25 +0000 UTC

过滤多个表 QSqlTableModel

  • 772

有две桌子category和equipment。
我正在尝试为他们制作一个过滤器,但事实证明equipment它可以在其中工作,
但category不能在...... =(

最小的例子:

import re
import sys
from PyQt5 import QtSql
from PyQt5.Qt import *

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

        self.createConnection()
        self.fillTable()  # !!!
        self.createModel()
        self.initUI()

        self.centralWidget = QWidget()
        self.setCentralWidget(self.centralWidget)
        self.table_box = QComboBox()
        self.table_box.addItems(["Оборудование", "Категории"])
        self.table_box.activated[str].connect(self.table_select)
        search_str = QLineEdit()
        search_str.setPlaceholderText("Введите строку поиска")
        search_str.textChanged.connect(self.update_filter)

        layout = QVBoxLayout(self.centralWidget)
        layout.addWidget(self.view)
        layout.addWidget(self.table_box)
        layout.addWidget(search_str)

    def createConnection(self):
        self.db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
        self.db.setDatabaseName("test_1318914.db")  # !!! .db
        if not self.db.open():
            print("Cannot establish a database connection")
            return False

    def fillTable(self):
        self.db.transaction()
        q = QtSql.QSqlQuery()
        #                             vvvvvvvv
        q.exec_("DROP TABLE IF EXISTS category;")
        q.exec_("CREATE TABLE category (id INT PRIMARY KEY, catname TEXT);")
        q.exec_("INSERT INTO category VALUES (1, 'Расходники');")
        q.exec_("INSERT INTO category VALUES (2, 'Носители');")

        #                             vvvv
        q.exec_("DROP TABLE IF EXISTS equipment;")
        q.exec_("CREATE TABLE equipment (Name TEXT, Quantity INT, Category INT);")
        q.exec_("INSERT INTO equipment VALUES ('Барабан для принтера', 8, 1);")
        q.exec_("INSERT INTO equipment VALUES ('Бумага для принтера', 3, 1);")
        q.exec_("INSERT INTO equipment VALUES ('Дискета', 10, 2);")
        self.db.commit()

    def createModel(self):
        self.model = QtSql.QSqlRelationalTableModel()
        self.model.setTable("equipment")
        self.model.select()

    def initUI(self):
        self.view = QTableView()
        self.view.setModel(self.model)
        self.view.setColumnWidth(0, 150)
        mode = QAbstractItemView.SingleSelection
        self.view.setSelectionMode(mode)


    def update_filter(self, text):
        if self.table_box.currentText() == 'Категории':
            s = re.sub("[\W_]+", "", text)
            filter_str = 'FROM category WHERE catname LIKE "%{}%"'.format(s)
            self.model.setFilter(filter_str)
        elif self.table_box.currentText() == 'Оборудование':
            s = re.sub("[\W_]+", "", text)
            filter_str = 'Name LIKE "%{}%"'.format(s)
            self.model.setFilter(filter_str)

    def table_select(self, text):
        if text == 'Категории':
            self.model.setTable("category")
            self.model.select()
        elif text == 'Оборудование':
            self.model.setTable("equipment")
            self.model.select()

    def closeEvent(self, event):
        if (self.db.open()):
            self.db.close()



if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Example()
    w.setWindowTitle("Search")
    w.resize(430, 250)
    w.show()
    sys.exit(app.exec_())

Действия:

  1. 我运行示例,出现一个视图窗口:

在此处输入图像描述

  1. 我输入QLineEdit例如“Ba”,他选择了正确的:

在此处输入图像描述

  1. 切换到“类别”:

在此处输入图像描述

  1. 当您尝试在“类别”表中搜索时,它不会搜索 =(

在此处输入图像描述

python
  • 2 2 个回答
  • 10 Views

2 个回答

  • Voted
  1. Best Answer
    S. Nick
    2022-09-22T04:26:55Z2022-09-22T04:26:55Z

    作为一种选择:

    import re
    import sys
    from PyQt5 import QtSql
    from PyQt5.Qt import *
    
    
    class Example(QMainWindow):
        def __init__(self):
            super().__init__()
    
            self.createConnection()
            self.fillTable()  # !!!
            self.createModel()
            self.initUI()
            
    # +++ vvvv       
            self.model_category  = self.model.relationModel(2)   # QtSql.QSqlTableModel
            #print(f'm_cat tableName == {self.model_category.tableName()}')
            #print(f'm_cat rowCount  == {self.model_category.rowCount()}')
            self.model_category.setHeaderData(0, Qt.Horizontal, "ID")
            self.model_category.setHeaderData(1, Qt.Horizontal, "Категория")
    # +++ ^^^^
    
            self.centralWidget = QWidget()
            self.setCentralWidget(self.centralWidget)
            self.table_box = QComboBox()
            self.table_box.addItems(["Оборудование", "Категории"])
            self.table_box.activated[str].connect(self.table_select)
            self.search_str = QLineEdit()                               # +++ self.
            self.search_str.setPlaceholderText("Введите строку поиска")
            self.search_str.textChanged.connect(self.update_filter)
    
            layout = QVBoxLayout(self.centralWidget)
            layout.addWidget(self.view)
            layout.addWidget(self.table_box)
            layout.addWidget(self.search_str)
    
        def createConnection(self):
            self.db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
            self.db.setDatabaseName("test_1318914.db")  # !!! .db
            if not self.db.open():
                print("Cannot establish a database connection")
                return False
    
        def fillTable(self):
            self.db.transaction()
            q = QtSql.QSqlQuery()
            
            q.exec_("DROP TABLE IF EXISTS category;")
            q.exec_("CREATE TABLE category (id INT PRIMARY KEY, catname TEXT);")
            q.exec_("INSERT INTO category VALUES (1, 'Расходники');")
            q.exec_("INSERT INTO category VALUES (2, 'Носители');")
    
            q.exec_("DROP TABLE IF EXISTS equipment;")
            q.exec_("CREATE TABLE equipment (Name TEXT, Quantity INT, Category INT);")
            q.exec_("INSERT INTO equipment VALUES ('Барабан для принтера', 8, 1);")
            q.exec_("INSERT INTO equipment VALUES ('Бумага для принтера', 3, 1);")
            q.exec_("INSERT INTO equipment VALUES ('Дискета', 10, 2);")
            self.db.commit()
    
        def createModel(self):
            self.model = QtSql.QSqlRelationalTableModel()
            self.model.setTable("equipment")
    # +++ vvvv
            self.model.setHeaderData(0, Qt.Horizontal, "Название")
            self.model.setHeaderData(1, Qt.Horizontal, "Кол-во")
            self.model.setHeaderData(2, Qt.Horizontal, "Категория")
            self.set_relation()
    # +++ ^^^^       
            self.model.select()
            
    # +++ vvvv
        def set_relation(self):
            self.model.setRelation(2, QtSql.QSqlRelation(
                "category",
                "id",
                "catname"
            ))        
    # +++ ^^^^
    
        def initUI(self):
            self.view = QTableView()
            self.view.setModel(self.model)
            self.view.setColumnWidth(0, 150)
            mode = QAbstractItemView.SingleSelection
            self.view.setSelectionMode(mode)
    
        def update_filter(self, text):
            if self.table_box.currentText() == 'Категории':
                s = re.sub("[\W_]+", "", text)
    #            filter_str = 'FROM category WHERE catname LIKE "%{}%"'.format(s)
                filter_str = 'catname LIKE "%{}%"'.format(s)
                self.model_category.setFilter(filter_str)                  # +++
            elif self.table_box.currentText() == 'Оборудование':
                s = re.sub("[\W_]+", "", text)
                filter_str = 'Name LIKE "%{}%"'.format(s)
                self.model.setFilter(filter_str)
    
        def table_select(self, text):
            self.search_str.clear()                        # +++
            if text == 'Категории':
    #            self.model.setTable("category")
    #            self.model.select()
                self.view.setModel(self.model_category)     # +++   
            elif text == 'Оборудование':
    #            self.model.setTable("equipment")
    #            self.model.select()
                self.view.setModel(self.model)              # +++
    
        def closeEvent(self, event):
            if (self.db.open()):
                self.db.close()
    
    
    if __name__ == '__main__':
        app = QApplication(sys.argv)
        w = Example()
        w.setWindowTitle("Search")
        w.resize(430, 250)
        w.show()
        sys.exit(app.exec_())
    

    在此处输入图像描述

    在此处输入图像描述

    • 1
  2. Konstantin
    2022-09-21T19:17:54Z2022-09-21T19:17:54Z

    https://doc.qt.io/qtforpython/PySide6/QtSql/QSqlTableModel.html?highlight=setfilter#PySide6.QtSql.PySide6.QtSql.QSqlTableModel.setFilter

    根据文档,总的来说,我做得有点过头了:过滤器是没有关键字的WHERE句子。简单来说,不需要对整个SQL查询进行fence,我们只要引用当前表的字段就可以了。SQLWHERE

    例如,而不是:

    filter_str = 'FROM category WHERE catname LIKE "%{}%"'.format(s)
    

    我们写:

    filter_str = 'catname LIKE "%{}%"'.format(s)
    
    • 0

相关问题

  • 是否可以以某种方式自定义 QTabWidget?

  • telebot.anihelper.ApiException 错误

  • Python。检查一个数字是否是 3 的幂。输出 无

  • 解析多个响应

  • 交换两个数组的元素,以便它们的新内容也反转

Sidebar

Stats

  • 问题 10021
  • Answers 30001
  • 最佳答案 8000
  • 用户 6900
  • 常问
  • 回答
  • Marko Smith

    表格填充不起作用

    • 2 个回答
  • Marko Smith

    提示 50/50,有两个,其中一个是正确的

    • 1 个回答
  • Marko Smith

    在 PyQt5 中停止进程

    • 1 个回答
  • Marko Smith

    我的脚本不工作

    • 1 个回答
  • Marko Smith

    在文本文件中写入和读取列表

    • 2 个回答
  • Marko Smith

    如何像屏幕截图中那样并排排列这些块?

    • 1 个回答
  • Marko Smith

    确定文本文件中每一行的字符数

    • 2 个回答
  • Marko Smith

    将接口对象传递给 JAVA 构造函数

    • 1 个回答
  • Marko Smith

    正确更新数据库中的数据

    • 1 个回答
  • Marko Smith

    Python解析不是css

    • 1 个回答
  • Martin Hope
    Alexandr_TT 2020年新年大赛! 2020-12-20 18:20:21 +0000 UTC
  • Martin Hope
    Alexandr_TT 圣诞树动画 2020-12-23 00:38:08 +0000 UTC
  • Martin Hope
    Air 究竟是什么标识了网站访问者? 2020-11-03 15:49:20 +0000 UTC
  • Martin Hope
    Qwertiy 号码显示 9223372036854775807 2020-07-11 18:16:49 +0000 UTC
  • Martin Hope
    user216109 如何为黑客设下陷阱,或充分击退攻击? 2020-05-10 02:22:52 +0000 UTC
  • Martin Hope
    Qwertiy 并变成3个无穷大 2020-11-06 07:15:57 +0000 UTC
  • Martin Hope
    koks_rs 什么是样板代码? 2020-10-27 15:43:19 +0000 UTC
  • Martin Hope
    Sirop4ik 向 git 提交发布的正确方法是什么? 2020-10-05 00:02:00 +0000 UTC
  • Martin Hope
    faoxis 为什么在这么多示例中函数都称为 foo? 2020-08-15 04:42:49 +0000 UTC
  • Martin Hope
    Pavel Mayorov 如何从事件或回调函数中返回值?或者至少等他们完成。 2020-08-11 16:49:28 +0000 UTC

热门标签

javascript python java php c# c++ html android jquery mysql

Explore

  • 主页
  • 问题
    • 热门问题
    • 最新问题
  • 标签
  • 帮助

Footer

RError.com

关于我们

  • 关于我们
  • 联系我们

Legal Stuff

  • Privacy Policy

帮助

© 2023 RError.com All Rights Reserve   沪ICP备12040472号-5