I need to do a SELECT to an SQL Server table and treat the information I get separately.
For example, let's say I have this table named Table1
And I do this SELECT in python:
SELECT name, phone, date FROM Table1
In the print the result would be:
[['Sara Miller',611111111],['Jane Smith',622222222],['Amanda
Laurens',633333333]]
I need to treat each row and each name and phone number separately to send SMS... So, how can I access each one using Python?
For example, to send an SMS to the number 611111111 saying
"Dear Sara Miller, tomorrow (20/05/2020) you have an appointment in
the Clinic"
The SMS part I have covered, using an API, the problem is I can't figure out how to treat received data from SQL Server.
The code I have at the moment is:
conn = pypyodbc.connect("Connection parameters, waorking OK")
cursor = conn.cursor()
cursor.execute('SELECT name, phone, date FROM Table1')
result = cursor.fetchall()
final_result = [list(i) for i in result]
print(final_result)
If I need to clarify something please let me know.
I haven't really worked with pypyodbc so I'm not sure what the format of the data that cursor.fetchall returns so I have listed two approaches which should cover both scenarios.
conn = pypyodbc.connect("Connection parameters, waorking OK")
cursor = conn.cursor()
cursor.execute('SELECT name, phone, date FROM Table1')
for row in cursor.fetchall():
name = row[0]
phone = row[1]
date = row[2]
# do something with these variables
If the result returned is a dict instead of a list then it becomes:
for row in cursor.fetchall():
name = row['name']
phone = row['phone']
date = row['date']
# do something with these variables
Or as #DanGuzman mentions we can also do:
for row in cursor.fetchall():
name = row.name
phone = row.phone
date = row.date
# do something with these variables
Related
I am currently working on a coursework project for school and it is a database system with a user interface using Tkinter, Python and SQLite3. I have made a form to add, delete, update and search for customers. I am able to display the result from a single field, however, I am struggling to get the message box to display all the fields, which is what I would like it to do. I have attached photos of the form along with the code. Thank you in advance.
def SearchCustomer(self):
customerid = self.CustomerEntry.get();
with sqlite3.connect("LeeOpt.db") as db:
cursor = db.cursor()
search_customer = ('''SELECT * FROM Customer WHERE CustomerID = ?''')
cursor.execute(search_customer, [(customerid)])
results = cursor.fetchall()
if results:
for i in results:
tkinter.messagebox.showinfo("Notification",i[0])
It is because you showed only the first column (i[0]) from result.
Since there should be only one record for a specific customer ID, you should use fetchone() instead of fetchall(), then you can show the whole record as below:
def SearchCustomer(self):
customerid = self.CustomerEntry.get()
with sqlite3.connect("LeeOpt.db") as db:
cursor = db.cursor()
search_customer = "SELECT * FROM Customer WHERE CustomerID = ?"
cursor.execute(search_customer, [customerid])
result = cursor.fetchone() # there should be only one record for specific customer ID
if result:
tkinter.messagebox.showinfo("Notification", "\n".join(str(x) for x in result))
I need to extract results from a redshift database based on an IF condition written in Python.
Suppose I have a table with CustomerID, SHipment Number, Invoice Station, ect as columns in Redshift table, I want to get all the records from Redshift table if customer ID exists which should be checked with user input.
TABLE NAME = ShipmentInfo
COLUMNS = CustomerID, BillNumber, Invoicing Station, Charges, etc.
Python
import psycopg2
con=psycopg2.connect(dbname= 'datamodel', host='123',
port= '5439', user= 'bce', password= 'Ciz')
cur = con.cursor()
HWB = input("Enter the House Bill Number : ")
#if CustomerID = HWB:
cur.execute("SELECT source_system, file_nbr, file_date, CustomerID
FROM public.shipment_info where CustomerID = $HWB")
results = cur.fetchall()
cur.close()
con.close()
print(results)
Consider parameterization of user input value (else risk the infamous, Bobby Tables).
# PREPARED STATEMENT WITH PLACEHOLDER
sql = """SELECT source_system, file_nbr, file_date, CustomerID
FROM public.shipment_info
WHERE CustomerID = %s
"""
# BIND PARAM VALUES WITH TUPLE OF ONE-ITEM
cur.execute(sql, (HWB,))
I have an issue when displaying a value in python retrieved from oracle table into CLOB field:
Oracle query:
SELECT EXTRACTVALUE(xmltype(t.xml), '/DCResponse/ResponseInfo/ApplicationId')
FROM table t
WHERE id = 2
Value displayed in Oracle Client
5701200
Python code
import cx_Oracle
conn = cx_Oracle.Connection("user/pwd#localhost:1521/orcl")
cursor = conn.cursor()
cursor.execute("""SELECT EXTRACTVALUE(xmltype(t.xml),'/DCResponse/ResponseInfo/ApplicationId') FROM table t where id = 2""")
for row in cursor:
print(row)
Python Console: Nothing is displayed!!! I want to show:5701200
Please Help.
Best Regards
Giancarlo
There are only a few issues with your code :
Replace cx_Oracle.Connection with cx_Oracle.connect
Be careful about the indentation related to the print(row)
Triple double-quotes, within the SELECT statement, are redundant,
replace them with Single double-quotes
Prefer Using print(row[0]) in order to return the desired number rather than
a tuple printed.
import cx_Oracle
conn = cx_Oracle.connect('user/pwd#localhost:1521/orcl')
cursor = conn.cursor()
query = "SELECT EXTRACTVALUE(xmltype(t.xml),'/DCResponse/ResponseInfo/ApplicationId')"
query += " FROM tab t "
query += " WHERE t.ID = 2 "
cursor.execute( query )
for row in cursor:
print(row[0])
Assigning a query to a variable not required, as stated in my case, but preferable to use in order to display the long SELECT statement decently.
If you want to iterate over result, use this one:
for row in cursor.execute("sql_query")
print(row)
or you can fetch each row like this:
cursor = conn.cursor()
cursor.execute("sql_query")
while True:
row = cursor.fetchone()
print(row)
I am new to Python and am hoping someone can help me figure out how to perform an SQL query on each item in a tuple using Python.
I have a SQL Express server that contains a number of databases for a badge reader system. What I am trying to do is pull the user id's that have scanned into a particular reader, then use those id's to get the actual user names.
Currently, I am able run the query that pulls the user id's and run a query on the other table using just one id. What want to be able to do, and seem to be having an issue figuring out, is running that second query on every user id in the tuple that is created from the first query. Below is the code for the two functions I am currently using.
def get_id():
global cardholder
global cur
cur.execute("SELECT user_id FROM db.table WHERE badgereaderid = 'badgereader1'")
cardholder = []
rows = cur.fetchall()
for row in rows:
if row == None:
break
cardholder.append(row[0])
print(cardholder)
def get_name():
global cardholder
global user
global cur
cur.execute("SELECT FirstName, LastName FROM db.table WHERE user_id= '%s'" % cardholder)
while 1:
row = cur.fetchone()
if row == None:
break
user = row[0] + row[1]
Two possible options
Repeated queries in Python
for user_id in cardholder:
cur.execute("SELECT FirstName, LastName FROM db.table WHERE user_id= '%s'" % user_id)
But why not just pull all the data in the first query?
cur.execute("SELECT a.user_id, b.FirstName, b.LastName FROM db.table1 a left join bd.table2 b on a.user_id = b.user_id WHERE a.badgereaderid = 'badgereader1'")
or, use triple quotes to allow multi-line strings and make the SQL command easier to understand
cur.execute("""SELECT
a.user_id,
b.FirstName,
b.LastName
FROM db.table1 a
left join db.table2 b
on a.user_id = b.user_id
WHERE a.badgereaderid = 'badgereader1'""")
A good practice in Python is to define the data collections outside the function if you intend to use them later on in your code
Try this code:
cardholder_names = []
#pass the cardholder as a param to the function
def get_name(cardholder):
#cur is already defined as a global param, no need to do it twice
cur.execute("SELECT FirstName, LastName FROM db.table WHERE user_id='{0}'".format(cardholder))
return cur.fetchone()
#now use the for loop to iterate over all the cardholders
for holder in cardholders:
cardholder_name = get_name(holder)
cardholder_names.append( {"name" : cardholder_name[0], "surname" : cardholder_name[1]})
I have a MySQL table which stores a couple thousands addresses. I need to parse them to geolocation API, get latitude and longitude and then put them back into corresponding address row (I made special columns for that). The question is what is the most efficient way to do it? Currently I am using python with mysql.connector and geopy for geolocations. So there is a simple code I use for geocoding:
cursor = conn.cursor()
cursor.execute("SELECT description FROM contacts WHERE kind = 'Home adress'")
row = cursor.fetchone()
while row is not None:
geocoded = geolocator.geocode(row, exactly_one=True)
if geocoded is not None:
lat = geocoded.latitude
lon = geocoded.longitude
row = cursor.fetchone()
You can use cursor.executemany() to update the table in one go. This requires that a list of update parameters be created which can then be passed to executemany(). The parameter list can be created from the results of the initial SELECT query. In the example below I have assumed that there is some primary key named key_id for the contacts table:
cursor = conn.cursor()
cursor.execute("SELECT key_id, description FROM contacts WHERE kind = 'Home adress'")
update_params = []
for key_id, description in cursor:
geocoded = geolocator.geocode(description, exactly_one=True)
if geocoded is not None:
lat = geocoded.latitude
lon = geocoded.longitude
update_params.append((lat, lon, key_id))
c.executemany("update contacts set lat = %s, lon = %s where key_id = %s", update_params)
As mentioned above this assumes existence of a primary key. If there is not one and description is a unique field in the table then you could use that. Just remove key_id from the SELECT query, and replace key_id with the description field for both the update_params list and the update query.
#mhavke, thanks a lot! Just what I needed. Here is a finally working code (I made some adjustments). Also I am aware that using '%s' is unsafe, but this goes for internal use only, so not really worried about it.
cursor = conn.cursor()
cursor.execute("SELECT key_id, description FROM contacts WHERE kind = 'Home address'")
update_params = []
for key_id, description in cursor:
geocoded = geolocator.geocode(description, exactly_one=True)
if geocoded is not None:
lat = geocoded.latitude
lon = geocoded.longitude
update_params.append((lat, lon, key_id))
cursor.executemany("update contacts set latitude = %s, longitude = %s where key_id = %s", update_params)
conn.commit()