Retrieving MySQL with Kivy

Question

I have a Kivy code, where the output is:

I want to get replace the Box No. with strings retrieved from MySQL

So far I have tried to implement the MySQL to the python script:

class RemoveScreen(MyLayout):


    def __init__(self,**kwargs):
        db = MySQLdb.connect("localhost", "root", "[PASSWORD]", "tcs_microrage_crm")
        cursor=db.cursor()
        self.var = StringVar()
        self.label1 = Label(self, text=0, textvariable=self.var)
        myvar=str(self.var)
        #http://stackoverflow.com/questions/775296/python-mysql-parameterized-queries
        cursor.execute("SELECT part_name FROM stock_lists WHERE part_number = %s", (myvar))
        self.myvar=StringVar()
        self.myvar.set(cursor.fetchone())
        self.label2 = Label(self, text=0, textvariable=myvar)

But this didn't work.

Q: How can I do MySQL queries and print individual strings in the kv file.

Answer 1

To show you how you could do that, I made a little search example.
This searches for fruit names in the database, and will output its name and price to the table.

from kivy.app import App

import MySQLdb

from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput


class DbCon:

    def __init__(self):
        self.db = MySQLdb.connect(user="root",passwd="pw",db="kivy")
        self.c = self.db.cursor()

    def get_rows(self,search = ""):
        self.c.execute("SELECT * FROM fruit WHERE name REGEXP '.*%s.*' LIMIT 3" % search)
        return self.c.fetchall()


class Table(BoxLayout):

    def __init__(self,**kwargs):
        super(Table,self).__init__(**kwargs)

        self.orientation = "vertical"

        self.search_field = BoxLayout(orientation="horizontal")

        self.search_input = TextInput(text='search',multiline=False)
        self.search_button = Button(text="search",on_press=self.search)

        self.search_field.add_widget(self.search_input)
        self.search_field.add_widget(self.search_button)

        self.add_widget(self.search_field)

        self.add_widget(Label(text="table"))

        self.table = GridLayout(cols=2,rows=4)
        self.table.add_widget(Label(text="Fruit"))
        self.table.add_widget(Label(text="Price"))

        self.rows = [[Label(text="item"),Label(text="price")],
                     [Label(text="item"),Label(text="price")],
                     [Label(text="item"),Label(text="price")]]

        for item,price in self.rows:
            self.table.add_widget(item)
            self.table.add_widget(price)

        self.add_widget(self.table)


        self.db = DbCon()
        self.update_table()


    def update_table(self,search=""):
        for index,row in enumerate(self.db.get_rows(search)):
            self.rows[index][0].text = row[1]
            self.rows[index][1].text = str(row[2])

    def clear_table(self):
        for index in range(3):
            self.rows[index][0].text = ""
            self.rows[index][1].text = ""


    def search(self, *args):
        self.clear_table()
        self.update_table(self.search_input.text)


class MyApp(App):
    def build(self):
        return Table()


MyApp().run()