I am querying my SQL table using the code below and converted the result to a list. Why is the list having unwanted commas and parenthesis?
The query result
[(34830,), (34650,), (35050,), (34500,), (35050,), (34500,), (34725,), (34550,), (34725,), (34760,), (34760,)]
It should just return a list with just numbers on it. Right?
The schema is simple (link text, price int);
What is the problem here? Is there something wrong with my code?
import pymysql
connection = pymysql.connect(host='localhost',
user='root',
password='passme',
db='hpsize') # connection obhect to pass the database details
sql = "SELECT price FROM dummy WHERE link ='https://www.flipkart.com/bose-noise-cancelling-700-anc-enabled-bluetooth-headset/p/itma57a01d3bd591?pid=ACCFGYZEVVGYM8FP'"
my_cursor = connection.cursor()
my_cursor.execute(sql)
result = list(my_cursor.fetchall())
print(result)
connection.close()
The query result
[(34830,), (34650,), (35050,), (34500,), (35050,), (34500,), (34725,), (34550,), (34725,), (34760,), (34760,)]
try
connection.row_factory = lambda cursor, row: row[0]
instead of list(my_cursor.fetchall())
then
result = connection.execute("""SELECT * FROM dummy""").fetchall()
or you can also use strip() to cut the unwanted part
Related
I am switching from SQLite to MySQL and getting some problems with my Queries. At the moment i am trying to SELECT from a Table where the PackageName is like a variable from a Text Input in my GUI.
The Query looks like this:
test = self.ms.ExecQuery("SELECT PackageID,PackageName,ServiceFee,Cost,LatestChanges FROM Package WHERE PackageName=?", (self.search_entry.GetValue(),))
and my ExecQuery looks like this:
def ExecQuery(self, sql):
cur = self._Getconnect()
cur.execute(sql)
relist = cur.fetchall()
cur.close()
self.conn.close()
return relist
And the error i am getting:
TypeError: ExecQuery() takes 2 positional arguments but 3 were given
What do i need to change to get this running?
You have sql as the 2nd parameter in your ExecQuery, yet you are passing in a sql query as the 1st parameter:
test = self.ms.ExecQuery("SELECT PackageID,PackageName,ServiceFee,Cost,LatestChanges FROM Package WHERE PackageName=?", (self.search_entry.GetValue(),))
I have been trying to retrieve data from my database. I was successful, however, this time inside an if statement. The code looks like:
cur_msql = conn_mysql.cursor(cursor=pymysql.cursors.DictCursor)
select_query = """select x,y,z from table where type='sample' and code=%s"""
cur_msql.execute(select_query, code)
result2 = cur_msql.fetchone()
if(result2==None):
insert_func(code)
select_query = f"""select x,y,z from table where type='sample' and code='{code}'"""
mycur = conn_mysql.cursor(cursor=pymysql.cursors.DictCursor)
print(select_query)
mycur.execute(select_query)
result3 = mycur.fetchone()
if(result2==None):
result2=result3
Now I see that insert_func does successfully insert into the 'table'. However, on trying to fetch that row, immediately after the insertion, it returns None as if the row is absent. On debugging I find that result3 is also None. Nothing looks wrong to me but it's not working.
you don´t execute it in the right way, in the cur_msql.execute, you the to send the query and a tuple of values, and you are sending just a value:
cur_msql = conn_mysql.cursor(cursor=pymysql.cursors.DictCursor)
select_query = "select learnpath_code,learnpath_id,learnpath_name from contentgrail.knowledge_vectors_test where Type='chapters' and code=%s"
cur_msql.execute(select_query, (meta['chapter_code'],))
result2 = cur_msql.fetchone()
How would I go about using the django.db.models Q module to query multiple lines of input from a list of data using a <textarea> html input field? I can query single objects just fine using a normal html <input> field. I've tried using the same code as my input field, except when requesting the input data, I attempt to split the lines like so:
def search_list(request):
template = 'search_result.html'
query = request.GET.get('q').split('\n')
for each in query:
if each:
results = Product.objects.filter(Q(name__icontains=each))
This did not work of course. My code to query one line of data (that works) is like this:
def search(request):
template = 'search_result.html'
query = request.GET.get('q')
if query:
results = Product.objects.filter(Q(name__icontains=query))
I basically just want to search my database for a list of data users input into a list, and return all of those results with one query. Your help would be much appreciated. Thanks.
Based on your comments, you want to implement OR-logic for the given q string.
We can create such Q object by reduce-ing a list of Q objects that each specify a Q(name__icontains=...) constraint. We reduce this with a "logical or" (a pipe in Python |), like:
from django.db.models import Q
from functools import reduce
from operator import or_
def search_list(request):
template = 'search_result.html'
results = Product.objects.all()
error = None
query = request.GET.get('q')
if query:
query = query.split('\n')
else:
error = 'No query specified'
if query:
results = results.filter(
reduce(or_, (Q(name__icontains=itm.strip()) for itm in query))
)
elif not error:
error = 'Empty query'
some_context = {
'results' : results,
'error': error
}
return render(request, 'app/some_template.html', some_context)
Here we thus first check if q exists and is not the empty string. If that is the case, the error is 'No query specified'. In case there is a query, we split that query, next we check if there is at least one element in the query. If not, our error is 'Empty query' (note that this can not happen with an ordinary .split('\n'), but perhaps you postprocess the list, and for example remove the empty elements).
In case there are elements in query, we perform the reduce(..) function, and thus filter the Products.
Finally here we return a render(..)ed response with some_template.html, and a context that here contains the error, and the result.
I'm trying to call a stored procedure on a multi-db Django installation, but am not having any luck getting results. The stored procedure (which is on the secondary database) always returns an empty array in Django, but the expected result does appear when executed in a mysql client.
My view.py file
from SomeDBModel import models
from django.db import connection
def index(request, someid):
#Some related django-style query that works here
loc = getLocationPath(someid, 1)
print(loc)
def getLocationPath(id, someval):
cursor = connection.cursor()
cursor.callproc("SomeDB.spGetLocationPath", [id, someval])
results = cursor.fetchall()
cursor.close()
return results
I have also tried:
from SomeDBModel import models
from django.db import connections
def index(request, someid):
#Some related Django-style query that works here
loc = getLocationPath(someid, 1)
print(loc)
def getLocationPath(id, someval):
cursor = connections["SomeDB"].cursor()
cursor.callproc("spGetLocationPath", [id, someval])
results = cursor.fetchall()
cursor.close()
return results
Each time I print out the results, I get:
[]
Example of data that should be retrieved:
{
Path: '/some/path/',
LocalPath: 'S:\Some\local\Path',
Folder: 'SomeFolderName',
Code: 'SomeCode'
}
One thing I also tried was to print the result of cursor.callproc. I get:
(id, someval)
Also, printing the result of cursor._executed gives:
b'SELECT #_SomeDB.spGetLocationPath_arg1, #_SomeDB.spGetLocationPath_arg2'
Which seems to not have any reference to the stored procedure I want to run at all. I have even tried this as a last resort:
cursor.execute("CALL spGetLocationPath("+str(id)+","+str(someval)+")")
but I get an error about needing multi=True, but putting it in the execute() function doesn't seem to work like some sites have suggested, and I don't know where else to put it in Django.
So...any ideas what I missed? How can I get stored procedures to work?
These are the following steps that I took:
Made my stored procedure dump results into a temporary table so as to flatten the result set to a single result set. This got rid of the need for multi=True
In addition, I made sure the user at my IP address had access to call stored procedures in the database itself.
Finally, I continued to research the callproc function. Eventually someone on another site suggested the following code, which worked:
cur = connections["SomeDB"].cursor()
cur.callproc("spGetLocationPath", [id, someval])
res = next(cur.stored_results()).fetchall()
cur.close()
I'm having a problem with running a select query, using mysql-python, on an established database. The issue is that a number, what Python refers to as a long, is returned instead of the data queried- it should be noted that this number corresponds to the number of records which should be returned (I logged into the database and ran the query from MySQL to make sure).
Here is the code:
db = MySQLdb.connect(db = 'testdb', user='testuser', passwd='test', host='localhost', charset='utf8', use_unicode=True)
dbc = db.cursor()
result = dbc.execute("""SELECT %s FROM example_movie""", ('title',))
urls = [row[0] for row in result]
The last bit of code, urls = [row[0] for row in result] is to put everything into a list.
The error looks like this:
TypeError: 'long' object is not iterable
When I have python print result it returns:
('RESULT:', 52L)
When I enclose result like str(result) it just returns the number 52 (not long)
Any help and suggestions are greatly appreciated!
The return value from dbc.execute is not the results of the select; I believe it is the number of rows in the results. In order to get the actual results you need to call one of the fetch methods. See documentation here.
You should update your code to read:
db = MySQLdb.connect(db = 'testdb', user='testuser', passwd='test', host='localhost', charset='utf8', use_unicode=True)
dbc = db.cursor()
row_count = dbc.execute("""SELECT title FROM example_movie""")
results = dbc.fetchall()
urls = [row[0] for row in result]