Tableview reload

Rufat

Hi, was wondering how can I reload tableview in my form, it does not give me any mistake, data inserts in database and I can see it after reloading the form. But can I reload tableview without reloading from? Thanks.

data = MyTableViewDataSource()
v = ui.TableView()

def button_tapped(sender):
	sqliteConnection = db.connect('pythonsqlite.db')
	cursor = sqliteConnection.cursor()
	print("Connected to SQLite")
		
        # adding single record now
	sql_add_data = "INSERT INTO Names (Name, Surname) VALUES ('?','?')"
	print(sql_add_data)
	cursor.execute(sql_add_data)
	sqliteConnection.commit()
	print("Record successfully Added ")
	print('button tapped')
	v['tableview1'].reload()
	
v['tableview1'].data_source=data

v = ui.load_view('MyForm')
v['tableview1'].data_source=MyTableViewDataSource()
v.present('sheet')

JonB

if i undertstand your question -- you want to insert a row, but not reload the whole table, since reload loses your place?

That is what insert_rows does -- you pass in a list of rows, or a list of (section,row)'s, and that lets the tableview know which cells have been inserted -- it will then query thr data source for those new rows, and will animate the insertion. you need to make sure your data source knows about the new rows first, and you need to know which rows got inserted.

JonB

also, i will point out that you seem to be creating two different data sources -- one unnamed one initially, then you use data in the button callback. Probably not what you intended.

Rufat

Thank you, that is the problem I can’t let the tableview to know that it is a new rows available.

            view = ui.load_view('MyForm')
	view['tableview1'].reload_data()
	view['tableview1'].data_source = MyTableViewDataSource()

JonB

Can you edit your post so the whitespace is correct? Make sure the back ticks are on their own line.

Use insert_rows instead of reload.
Don't use datasource=MyTableViewDataSource() in your button action. Your datasource should already be instantiated.

Also it would help if you post your datasource code -- is your datasource reading from the database each time it is called?

Rufat

This is the full code

import ui
import sqlite3 as db

conn = db.connect('pythonsqlite.db')
conn.row_factory = lambda cursor, row: row[0]
c = conn.cursor()
ids = c.execute('SELECT name FROM Names').fetchall()
ids1 = c.execute('SELECT surname FROM Names').fetchall()

class MyTableViewDataSource (object):			
		
def tableview_number_of_sections(self, tableview):
	# Return the number of sections (defaults to 1)
  return 1

def tableview_number_of_rows(self, tableview, section):
	# Return the number of rows in the section
  return len(ids)

def tableview_cell_for_row(self, tableview, section, row):
	# Create and return a cell for the given section/row
	
	self.data = ids
	self.data1 = ids1
	self.cells = [ui.TableViewCell('value1') #'subtitle'
                  for _ in range(len(self.data))]
	cell = self.cells[row]
	cell.text_label.text = self.data[row]
	cell.detail_text_label.text = self.data1[row]
	return cell

def tableview_title_for_header(self, tableview, section):
	# Return a title for the given section.
	# If this is not implemented, no section headers will be shown.
	return ('Name')
	
def tableview_can_delete(self, tableview, section, row):
	# Return True if the user should be able to delete the given row.
	return True

def tableview_can_move(self, tableview, section, row):
	# Return True if a reordering control should be shown for the given row (in editing mode).
	return True

def tableview_delete(self, tableview, section, row):
	# Called when the user confirms deletion of the given row.
	print ('Delete row ' + tableview.data_source.data[row])
	sqliteConnection = db.connect('pythonsqlite.db')
	cursor = sqliteConnection.cursor()
	print("Connected to SQLite")
	
	# Deleting single record now
	sql_delete_query = "DELETE from Names where Name=""'"+tableview.data_source.data[row]+"'"
	print(sql_delete_query)
	cursor.execute(sql_delete_query)
	sqliteConnection.commit()
	print("Record deleted successfully ")
	
	del tableview.data_source.data[row]
	del tableview.data_source.data1[row]
	cursor.close()
	tableview.reload()
	pass

def tableview_move_row(self, tableview, from_section, from_row, to_section, to_row):
	# Called when the user moves a row with the reordering control (in editing mode).
	pass
	
def addBtn(sender):
	sqliteConnection = db.connect('pythonsqlite.db')
	cursor = sqliteConnection.cursor()
	print("Connected to SQLite")
	# adding single record now
	sql_add_data = "INSERT INTO Names (Name, Surname) VALUES ('?','?')"
	print(sql_add_data)
	cursor.execute(sql_add_data)
	sqliteConnection.commit()
	print("Record successfully Added ")

v = ui.load_view('MyForm')
v['tableview1'].data_source = MyTableViewDataSource()
v.present('sheet')

JonB

Ok, where to begin?

Your data source is providing cells based on ids , which you never update. So, of course your data source will never know about the update. When you add the rows, you should also update ids and ids1 . Even better than using a global variable, you should create an instance of your data source, and then add ids as an attribute to your instance.

Other issues:

 self.cells = [ui.TableViewCell('value1') #'subtitle'
                  for _ in range(len(self.data))]

This is not doing what you think... cell for row gets called EVERY time a cell comes into view. You are creating and throwing away a zillion TableViewCells. If you want to reuse cells, fine, but create them in __init__ . But then don’t forget to append to it in your button callback.

You should never call reload, until your data source is prepared to provide the new rows (or in case of delete, your data source must know the rows are deleted). If you keep your data up to date, then you never actually need to call reload, unless you have somehow changed your entire table.

Tableviews can be a bit tricky — the whole idea is that the table view and tableviewcells are not the data, they are just a lightweight view showing a window to the data. Don’t worry about trying to cache the table view cells — just create a new cell, fill in the info about the row, and return it. The OS magic then handles displaying the cell. The OS will query your data source before the first view to figure out how many cells there will be, and then figures out how many cells will fit on the screen, and only asks for that many cells. As you scroll, it is asking for cells. If you call add or delete, it will ask for data about the inserted cells.

Rufat

Thank you so much, I’l try to figure it out. Just can’t find any live example in the web. But how it works for deleting? And same thing (System) doesn’t work for adding the rows.

Rufat

I did it, thank you so much!

JonB

You should post your solution (or a link to gist) back here to help others that might have similar issues.

Rufat

Here is how it works for me.

     import ui
     import sqlite3 as db
     import dialogs

     conn = db.connect('pythonsqlite.db')
     conn.row_factory = lambda cursor, row: row[0]
     c = conn.cursor()
    ids = c.execute('SELECT name FROM Names').fetchall()
    ids1 = c.execute('SELECT surname FROM Names').fetchall()


  class MyTableViewDataSource (object):
   def __init__(self):
	self.items = ids		
	self.items1 = ids1
	
def tableview_number_of_sections(self, tableview):
	# Return the number of sections (defaults to 1)
	return 1

def tableview_number_of_rows(self, tableview, section):
	# Return the number of rows in the section
	return len(self.items)

def tableview_cell_for_row(self, tableview, section, row):
	# Create and return a cell for the given section/row
	cell = ui.TableViewCell('subtitle')
	cell.text_label.text = self.items[row]
	cell.detail_text_label.text = self.items1[row]
	return cell

def tableview_title_for_header(self, tableview, section):
	# Return a title for the given section.
	# If this is not implemented, no section headers will be shown.
	return ('Name')
	

def tableview_can_delete(self, tableview, section, row):
	# Return True if the user should be able to delete the given row.
	return True

def tableview_can_move(self, tableview, section, row):
	# Return True if a reordering control should be shown for the given row (in editing mode).
	return True

def tableview_delete(self, tableview, section, row):
	# Called when the user confirms deletion of the given row.
	#my = ("Name=""'"+tableview.data_source.data[row]+"'")
	#print(my)
	print ('Delete row ' + tableview.data_source.items[row])
	sqliteConnection = db.connect('pythonsqlite.db')
	cursor = sqliteConnection.cursor()
	print("Connected to SQLite")
	
	# Deleting single record now
	sql_delete_query = "DELETE from Names where Name=""'"+tableview.data_source.items[row]+"'"
	print(sql_delete_query)
	cursor.execute(sql_delete_query)
	sqliteConnection.commit()
	print("Record deleted successfully ")
	
	del tableview.data_source.items[row]
	del tableview.data_source.items1[row]
	cursor.close()
	tableview.reload()
	pass

def tableview_move_row(self, tableview, from_section, from_row, to_section, to_row):
	# Called when the user moves a row with the reordering control (in editing mode).
	pass
	
def add(self, sender):
	item = dialogs.input_alert('Add your name')
	item1 = dialogs.input_alert('Add your surname')
	if not item == None:
		self.items.append(item)
		self.items1.append(item1)
		view['tableview1'].reload()
	sqliteConnection = db.connect('pythonsqlite.db')
	cursor = sqliteConnection.cursor()
	print("Connected to SQLite")
	# adding single record now
	sql_add_data = "INSERT INTO Names (Name, Surname) VALUES "+"("+"'"+item+"'"+", "+"'"+item1+"'"+")"
	cursor.execute(sql_add_data)
	sqliteConnection.commit()
	cursor.close()
	

    view = ui.load_view('MyForm')
    source = MyTableViewDataSource()
    view.right_button_items = [ui.ButtonItem(title='add', action=source.add)]
    view['tableview1'].data_source = source
    view.present('sheet')

soydepr

But. Can you bring a dB from another place and drop it in Pythonista and how u do it

cvp

@soydepr you can import the db file into Pythonista but you could even open/access it without importing it, like explained here for a script.

Here under, how to import

soydepr

@cvp said:

import

For me the file is not accessible greyes out
https://imgur.com/KTy2w8o all my dB files are not selectables

cvp

@soydepr said:

greyes out

You're right, sorry

If you use "external files", it will work

cvp

@soydepr other solution: you can share a .db file from the Files app to Pythonista and run the standard "import file" script

soydepr

@cvp is original solution a bug ,

Thanks I confirm your other solution does work

cvp

@soydepr you can also try

	f = dialogs.pick_document()

.db files are not grayed

soydepr

This post is deleted!