I am trying to delete multiple rows in mysql table, through a loop in python. There is no error message but finally the table is not being updated. My code is:
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="root",
password="1234",
database="Share")
mycursor = mydb.cursor()
for i in range(288, 297):
sql = "DELETE from name_list where ID = " + str(i)
mycursor.execute(sql)
mydb.commit()
mycursor.execute("SELECT * from Share.name_list")
for row in mycursor.fetchall() :
print(row)
Thanks
How about this?
for i in range(288, 297):
sql = "DELETE from name_list where ID = %s"
mycursor.execute(sql, (i, ))
mydb.commit()
source
this should automatically quote the variable based on the datatype and has the added benefit of sql injection protection.
In this case it doesn't matter, since the parameter is always generated by range() but concatenating variables into sql queries manually is generally bad habit.
Related
firstly apologies for the basic question, just starting off with Python.
I have the following code:
import sqlite3
conn = sqlite3.connect("test.sqb")
cursor = conn.cursor()
sql = "SELECT * FROM report WHERE type LIKE 'C%'"
cursor.execute(sql)
data = cursor.fetchall()
for row in data:
print (row[0])
cursor.execute("UPDATE report SET route='ABCDE'")
conn.commit()
conn.close()
Why is it updating all records and not just the filtered records from sql query, even though the print (row[0]) just shows the filtered records.
Many thanks.
What's actually happening is you are running this query for each record returned from the SELECT query.
UPDATE report SET route='ABCDE'
If you only want to update route where type starts with C add the criteria to the UPDATE query and execute it once.
import sqlite3
conn = sqlite3.connect("test.sqb")
cursor = conn.cursor()
sql = "SELECT * FROM report WHERE type LIKE 'C%'"
cursor.execute(sql)
data = cursor.fetchall()
cursor.execute("UPDATE report SET route='ABCDE' WHERE type LIKE 'C%'")
conn.commit()
conn.close()
I am trying to update a SQL Table given a users input I have the following code. The user can choose to enter in/change the below fields which are defaulted to the values in the SQL table. However when I run the code I get the following error message
mysql.connector.errors.ProgrammingError: Not enough parameters for the SQL statement
I have counted it many times and it seems like the %s match the passed parameters. Am I missing something?
user = User_name_body.get('1.0',END)
passw = Password_text.get('1.0',END)
first = First_name.get('1.0',END)
last = Last_name.get('1.0',END)
phone = Phone_number.get('1.0',END)
email = Email_address.get('1.0',END)
mycursor = mydb.cursor()
sql = "UPDATE t_users SET Email_address=%s, First_name=%s, Last_name=%s, Phone_Number=%s, Password=%s WHERE User_Name=%s VALUES(%s,%s,%s,%s,%s,%s)"
val = (email, first, last, phone, passw,user)
mycursor.execute(sql, val)
mydb.commit()
mydb.close()
UPDATE does not take VALUES, you should change your sql query line to look like this:
sql = "UPDATE t_users SET Email_address=%s, First_name=%s, Last_name=%s, Phone_Number=%s, Password=%s WHERE User_Name=%s"
Python throws an error because you are asking for 12 parameters and only providing 6.
Prepare your sql data like this:
sql = """ UPDATE t_users SET Email_address=%s, First_name=%s, Last_name=%s, Phone_Number=%s, Password=%s WHERE User_Name = %s """
val = (email, first, last, phone, passw, user)
mycursor.execute(sql, val)
or you can do it like this
sql = "UPDATE btms_users SET btms_users.user='%s', btms_users.secret='%s' , btms_users.first_name='%s', " \
"btms_users.second_name='%s', btms_users.email='%s', btms_users.mobile='%s' " \
"WHERE btms_users.id='%s'" % (user_name, user_secret, user_firstname, user_lastname,
user_email, user_phone, user_id)
mycursor.execute(sql)
and here is a full working example:
import mysql.connector
mydb = mysql.connector.connect(
host="localhost",
user="root",
password="test",
database="test"
)
mycursor = mydb.cursor()
sql = "UPDATE items SET name = %s WHERE id = %s"
val = ("Test", 1)
mycursor.execute(sql, val)
mydb.commit()
print(mycursor.rowcount, "record(s) affected")
hi I am doing the python mysql at this project, I initial the database and try to create the table record, but it seems cannot load data to the table, can anyone here can help me out with this
import mysql.connector
mydb = mysql.connector.connect( host="localhost",user="root",password="asd619248636",database="mydatabase")
mycursor = mydb.cursor()
mycursor.excute=("CREATE TABLE record (temperature FLOAT(20) , humidity FLOAT(20))")
sql = "INSERT INTO record (temperature,humidity) VALUES (%d, %d)"
val = (2.3,4.5)
mycursor.execute(sql,val)
mydb.commit()
print(mycursor.rowcount, "record inserted.")
and the error shows "Not all parameters were used in the SQL statement")
mysql.connector.errors.ProgrammingError: Not all parameters were used in the SQL statement
Changing the following should fix your problem:
sql = "INSERT INTO record (temperature,humidity) VALUES (%s, %s)"
val = ("2.3","4.5") # You can also use (2.3, 4.5)
mycursor.execute(sql,val)
The database API takes strings as arguments, and later converts them to the appropriate datatype. Your code is throwing an error because it isn't expecting %d or %f (int or float) datatypes.
For more info on this you can look here
simply change insert method to
sql = "INSERT INTO record (temperature,humidity) VALUES (%s, %s)"
then it works fine
This works for me.
# Insert from dataframe to table in SQL Server
import time
import pandas as pd
import pyodbc
# create timer
start_time = time.time()
from sqlalchemy import create_engine
df = pd.read_csv("C:\\your_path_here\\CSV1.csv")
conn_str = (
r'DRIVER={SQL Server Native Client 11.0};'
r'SERVER=Excel-Your_Server_Name;'
r'DATABASE=NORTHWND;'
r'Trusted_Connection=yes;'
)
cnxn = pyodbc.connect(conn_str)
cursor = cnxn.cursor()
for index,row in df.iterrows():
cursor.execute('INSERT INTO dbo.Table_1([Name],[Address],[Age],[Work]) values (?,?,?,?)',
row['Name'],
row['Address'],
row['Age'],
row['Work'])
cnxn.commit()
cursor.close()
cnxn.close()
I am trying to update a mysql table with variable names. Below is the code that is not working for me:
import mysql.connector
conn= mysql.connector.connect(
host=host,
user=user,
passwd=password,
database=database
)
cur = conn.cursor()
cur.execute("update player_list set country = '%s', region = '%s',name = '%s' where id = %s "
% (country, region,name, id))
Running the "cur execute" line returns the following error:
mysql.connector.errors.InternalError: Unread result found
The ID column is an integer if it has any importance.
I don't see any code here how you've created your cursor, but looks like you need to specify buffered mode for your sql class to read.
Please, refer to official documentation and change your code to use buffer=True while creating your cursor and use it afterwards.
https://dev.mysql.com/doc/connector-python/en/connector-python-api-mysqlcursorbuffered.html
Try
with conn.cursor() as cur:
sql = "update player_list set country = '%s', region = '%s',name = '%s' where id = %s" % (country, region,name, id)
cur.execute(sql)
conn.commit()
and add buffered = True into your conn like
connection = mysql.connector.connect([...], buffered = True)
I have a MySQL Table named TBLTEST with two columns ID and qSQL. Each qSQL has SQL queries in it.
I have another table FACTRESTTBL.
There are 10 rows in the table TBLTEST.
For example, On TBLTEST lets take id =4 and qSQL ="select id, city, state from ABC".
How can I insert into the FACTRESTTBL from TBLTEST using python, may be using dictionary?
Thx!
You can use MySQLdb for Python.
Sample code (you'll need to debug it as I have no way of running it here):
#!/usr/bin/python
import MySQLdb
# Open database connection
db = MySQLdb.connect("localhost","testuser","test123","TESTDB" )
# prepare a cursor object using cursor() method
cursor = db.cursor()
# Select qSQL with id=4.
cursor.execute("SELECT qSQL FROM TBLTEST WHERE id = 4")
# Fetch a single row using fetchone() method.
results = cursor.fetchone()
qSQL = results[0]
cursor.execute(qSQL)
# Fetch all the rows in a list of lists.
qSQLresults = cursor.fetchall()
for row in qSQLresults:
id = row[0]
city = row[1]
#SQL query to INSERT a record into the table FACTRESTTBL.
cursor.execute('''INSERT into FACTRESTTBL (id, city)
values (%s, %s)''',
(id, city))
# Commit your changes in the database
db.commit()
# disconnect from server
db.close()