models.py

from peewee import*

# включение бд
db = MySQLDatabase('uchet', user ='root', password ='*****',
host='localhost', port=3306)

class Base(Model):
    class Meta:
        database = db

class Dlina(Base):
    iddlina = PrimaryKeyField(unique=True)
    grunt = FloatField()
    kab_kanliz = FloatField()
    po_stene = FloatField()
    trassa = FloatField()

#запрос к БД
for dlina in Dlina.select():
    print(dlina.grunt,'|', dlina.kab_kanliz,'|',dlina.po_stene,'|',dlina.trassa)

tabl_db.py

-- coding: utf-8 --

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(890, 562)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(MainWindow.sizePolicy().hasHeightForWidth())
        MainWindow.setSizePolicy(sizePolicy)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(40, 180, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(40, 220, 75, 23))
        self.pushButton_2.setObjectName("pushButton_2")
        self.tableWidget = QtWidgets.QTableWidget(self.centralwidget)
        self.tableWidget.setGeometry(QtCore.QRect(130, 50, 720, 450))
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Maximum, QtWidgets.QSizePolicy.Maximum)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(self.tableWidget.sizePolicy().hasHeightForWidth())
        self.tableWidget.setSizePolicy(sizePolicy)
        self.tableWidget.setFocusPolicy(QtCore.Qt.NoFocus)
        self.tableWidget.setColumnCount(10)
        self.tableWidget.setObjectName("tableWidget")
        self.tableWidget.setRowCount(0)
        self.tableWidget.horizontalHeader().setVisible(True)
        self.tableWidget.horizontalHeader().setMinimumSectionSize(20)
        self.tableWidget.verticalHeader().setDefaultSectionSize(20)
        self.tableWidget.verticalHeader().setMinimumSectionSize(15)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 890, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "ТАБЛИЦА БД"))
        self.pushButton.setText(_translate("MainWindow", "Заполнить"))
        self.pushButton_2.setText(_translate("MainWindow", "очистить"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())