I'm trying to populate two different QTableWidgets. For the first one it works find, but for the second one, it won't actaully set the items to the QTableWidget.
In the second, failing attempt, it does successfully create the item (both type(item) and item.text() work fine and return the correct values). However, when I try to add the item to the table, it says that table2.item(row, col) is NoneType. The rows and columns are created correctly before setting the item though.
working attempt:
item = QTableWidgetItem(self.fields[j].name())
item.setFlags(Qt.ItemIsSelectable | Qt.ItemIsEnabled)
table1.setItem(j,i,item)
failing attempt:
item = QTableWidgetItem(typ)
item.setFlags(Qt.ItemIsSelectable | Qt.ItemIsEnabled)
table2.setItem(row, col, item)
Neither can I see the difference between the two blocks, nor do I understand why it won't set the item to the TableWidget. Is there a geneal misunderstandng about how this works?
Related
I have a database from which data is coming into a QTableWidget. The table in the database has the following Columns,
ID (Primary key, auto-increment value)
Name
Location
The QTableWidget has the following columns (that I have added)
ID (this column, I have hidden. and it contains the value of "ID" column from the Database Table)
Sr # (Represents the Row Number of the table)
Name (Contains "name" from the database table)
Location (Contains "Location from the database table)
Actions (Contains a Delete Button for that Row)
By hidden, I mean to say that I have made this column hidden using the folliwng command,
self.ui.table.setColumnHidden(0, True);
This is how I am populating my QTableWidget and creating a Delete Function,
def get_data(self):
mycursor = self.DB.cursor()
Subquery = "select id, name, location "
Subquery += " from tbl_person"
mycursor.execute(Subquery)
numcols = len(mycursor.fetchall()[0])
mycursor.execute(Subquery)
numrows = len(mycursor.fetchall())
self.ui.table.setRowCount(numrows)
self.ui.table.setColumnCount(numcols+2)
mycursor.execute(Subquery)
tablerow = 0
for row in mycursor.fetchall():
layout = QHBoxLayout()
layout.setContentsMargins(0, 0, 0, 0)
layout.setSpacing(0)
delete_button = QPushButton("Delete Data")
delete_button.clicked.connect(self.executeDeleteFunction)
# delete_button.setStyleSheet(delete_push_button) -> Only for styling
self.ui.table.setItem(tablerow, 0, PySide2.QtWidgets.QTableWidgetItem(str(row[0])))
self.ui.table.setItem(tablerow, 1, PySide2.QtWidgets.QTableWidgetItem(str(tablerow+1)))
self.ui.table.setItem(tablerow, 2, PySide2.QtWidgets.QTableWidgetItem(str(row[1])))
self.ui.table.setItem(tablerow, 3, PySide2.QtWidgets.QTableWidgetItem(str(row[2])))
self.ui.table.setCellWidget(tablerow, 4, delete_button)
tablerow += 1
self.ui.table.setColumnHidden(0, True)
#self.ui.registered_table.horizontalHeader().setSectionResizeMode(PySide2.QtWidgets.QHeaderView.Stretch)
self.ui.table.resizeColumnsToContents()
def executeDeleteFunction(self):
self.person_id = self.ui.table.selectionModel().selectedIndexes()[0]
self.person_id = self.person_id.row()
mycursor = self.DB.cursor()
sql = "delete from tbl_person where id = %s"
val = (id, )
mycursor.execute(sql, val)
print("Deletion Successful")
On the Deletion Function, what this code does is basically gets the value of the **Sr # ** Column from the QTableWidget and deletes the data according to that, i.e. it is getting me the value from the visible first column and not the actual first column. But, I want the data from the "ID" column of the QTableWidget which is hidden
I tried to look up on how to get the value from the first hidden column on the QTableWidget and ended up with this link: How to get data from hidden 'id' column in QtableWidget
This apparently solves my issue but I can not seem to make it work for my code. I don't want to retrieve values of multiple Rows but only of one row so how do I do this (as I am only deleting one row. But in the question mentioned, I believe that it is getting data from multiple rows due to that for each loop)?
Moreover, I tried to find help regarding the functionality of sibling function (which is provided in the answer of above question) however I could not find any good resource on this function (i.e. how to use this, or some practical example and etc.)
I tried the following with Sibling function to obtain the value of first hidden column of the Selected Row but it did not work,
self.value = self.table.selectedItems()[0]
self.value = sibling(self.value.row(), 0)
There are some conceptual problems with the given code.
First of all, the QtSql module should be preferred instead of artificially creating a model. For basic tables, QSqlTableModel is fine enough, while for custom queries, QSqlQueryModel is a good choice.
Now the problem is that UI-based selection is always based on visible items: if you select a row in a view that has hidden columns, you will not get the hidden indexes that belong to those columns.
In order to get the indexes (as in QModelIndex) of hidden columns on a table widget, the only way is the same for a table view: you need to access the model and get the index for the row, or you get the actual model index and then get the sibling (which is conceptually the same, as the underlying function does):
item = self.table.selectedItems()[0]
index = self.table.indexForItem(index)
firstRowIndex = index.sibling(index.row(), 0)
sqlIndex = firstRowIndex.data() # might be a string
Note that you can also use siblingAtColumn():
firstRowIndex = index.siblingAtColumn(0)
That's because when you create QTableWidget items, you're actually creating a new model, and the row for that model doesn't reflect the actual "row" of that index in the source model; items in the second row will return 1 for row(), even if their actual row is different, and that's because that item has been added as second to the table widget, since it's the second item in the query.
So, the solution is that you either get the incremental row value for the first column index sibling, or you use one of the predefined Sql models.
For simple models, the latter solution is fine enough, but if you need more complex models, the first is certainly more accurate and reliable.
driver_data_form = {
'forc_day_off':[],
'pref_day_off':[],
'pref_shift':{"day"+str(i):None for i in range(1,15)},
'route_data':[]
}
So I am creating the dict driver_data (seen below) by using driver_data_form (seen above)
driver_data = {str(i):driver_data_form for i in range(1,12)}
and accordingly populating it :
loop_list = [str(i) for i in range(1,13)]
1 for specific_driver in loop_list:
2 for driver in forced_day_off_data:
3 for day in driver:
4 if driver[day]=='1' and day != "driverid":
5 driver_data[specific_driver]['forc_day_off'].append(day)
forced_day_off_data looks like:
But for some reason, after the above loop is executed once (lines 2-5), and by placing a break point in line 2, I am getting all 11 values of my driver_data[forc_day_off] dictionary populated, instead of only the first one. It appears that the values of the first key are copied to all the rest of the values:
I debugged this piece of code many times and this behavior makes no sence to me? What could be causing this and how can I fix it?
The problem with your code is that python is using references to dicts and lists. When you do this
driver_data = {str(i):driver_data_form for i in range(1,12)}
It basically sets the same dict reference for all your keys so when you change one value you actually update for all the other keys since it's the same dict
For your code to work you need to do this:
driver_data = {str(i):{
'forc_day_off':[],
'pref_day_off':[],
'pref_shift':{"day"+str(j):None for j in range(1,15)},
'route_data':[]
} for i in range(1,12)}
This way you create a new dict for each element and you will update only the specific dict.
See this this link to better understand the difference.
I am trying to check if a value is in SQLite with python to then either update the table if the value exists or create a new value if it is not. I have tried to create a cursor to check rows, append the rows to a list with loop, check if value exists, check the count of the rows... I seems to get hung up on the if statement when trying to access the value initialized from the query. Here is the code:
checkT = db.execute("SELECT COUNT(*) FROM trans WHERE stock=:stock AND id=:user_id", stock=request.form.get("symbol"), user_id=session["user_id"])
if checkT > 0:
print("there")
else:
print("not there")
How can I fix this? Thank you!
From the CS50 Library for Python doc for execute
Returns
for SELECTs, a list of dict objects, each of which represents a row in the result set; for INSERTs, the primary key of a newly inserted row (or None if none); for UPDATEs, the number of rows updated; for DELETEs, the number of rows deleted; for CREATEs, True on success; on error, a RuntimeError is raised
checkT is a list with one element, which is a dict with one key/value pair.
This checkT[0]['COUNT(*)'] will give the number returned from the sql. Counting the rows would not be appropriate in this case because this query will always return one row.
One hint: column names in a SELECT can be aliased, given a different name, like so:
SELECT COUNT(*) as count from....... It would just be typing convenience, because then the key in the returned dict will be count instead of COUNT(*).
Remember: in the flask run terminal there is a traceback with gives more details information on the error received (assuming "hung up" means a 500 Internal Server Error).
It's rare that I find an issue that hasn't already be answered but I've been searching for this for 3 days and haven't found anything yet.
I'm aiming to create a page for inputing records in a 'spreadsheet' like format. I've used inline editing in SQLFORM.grid from this slice.
The problem I'm having is that when one of the fields is a reference to another table, the row being use in the lambda function is taking the row of the reference table rather than the row in the grid.
Here is an example:
Model
db.define_table('people',
Field('name', 'string'),
format = '%(name)s',
)
db.define_table('animals',
Field('name', 'string'),
Field('pet_owner', 'reference people'),
format = '%(name)s',
)
Controller
def index():
#process submitted form
if len(request.post_vars) > 0:
print request.post_vars
for key, value in request.post_vars.iteritems():
(field_name,sep,row_id) = key.partition('_row_')
if row_id:
db(db.animals.id == row_id).update(**{field_name:value})
db.animals.name.represent = lambda value,row: SQLFORM.widgets.string.widget(db.animals.pet_owner,value, **{'_name':'name_row_%s' % row.id})
db.animals.pet_owner.represent = lambda value,row: SQLFORM.widgets.options.widget(db.animals.pet_owner,value, **{'_name':'pet_owner_row_%s' % row.id})
grid = SQLFORM.grid(db.animals,
selectable= lambda ids : redirect(URL('animals',vars=request._get_vars)),
)
grid.elements(_type='checkbox',_name='records',replace=None) #remove selectable's checkboxes
return dict(grid=grid)
At first it appears that the grid is working correctly. However, when inspecting the drop-downs for the reference fields, if two consecutive rows have the same value (e.g. two animals with the same owner) the same row is used in the name (pet_owner_row_1) which means that the value being passed to process the submitted form is not an integer (e.g. 3) but as the integers separated by pipes (e.g. '|3|3|').
I've confirmed that this is where the issue is by changing the represent to
db.animals.pet_owner.represent = lambda value,row: row
which shows the exact same row data for different animals.
Here is an image showing the inspector on the form items: http://i.stack.imgur.com/oFtF8.png
How can I get the row id of the grid's row rather than the id of the reference?
Any help is greatly appreciated!
This is a bug that has recently been fixed in the master branch but not released yet. In the meantime, a workaround is to temporarily change the field to an integer type:
db.animals.pet_owner.type = 'integer'
db.animals.pet_owner.represent = lambda value,row: SQLFORM.widgets.options.widget(
db.animals.pet_owner,value, **{'_name':'pet_owner_row_%s' % row.id})
I have a Paginated List displayed on the visual force page and in the backend I was using a StandardSetController to control the pagination. However, one column on the table is an aggregated field whose calculation is done in a wrapper class. Recently, I want to sort the paginated list against the calculated field. And unfortunately the calculated result cannot be done on the data model(SObject) level.
So I am thinking to passed a sorted list of SObject to the StandardSetController constructor. That is to sort the record before it has been pass into the StandardSetController.
The code is like below:
List<Job__c> jobs = new List<Job__c>();
List<Job__c> tempJobs = Database.Query(basicQuery + filterExpression);
//sort with values
List<JobWrapper> jws = createJobWrappers(tempJobs);
JobWrapper.sortBy = JobWrapper.SORTBY_CALCULATEDFIELD_ASC;
jws.sort();
for(JobWrapper jw : jws){
jobs.add(jw.JobRecord);
}
jobs = jobs.deepClone(true, true, true);
StandardSetController con = new ApexPages.StandardSetController(jobs);
con.setPageSize(10);
However after executing the last line system throw exception:Modified rows exist in the records collection!
I did not modify any rows in the controller. Could anyone help me understanding the exception?