We Keep Coding

Inserting csv into MySQL database with python library mysql.connector

I have trouble with insert of csv data into MySQL tabel with mysql.connector .
The code I use looks like this :
import mysql.connector
import csv
andreport = 'testowa.csv'
cnx = mysql.connector.connect(
user='xxxxx',
password='xxxxx',
host='xxxxxx',
database='xxxxx')
cursor = cnx.cursor()
with open(andreport, 'r') as csv_data:
for row in csv_data:
cursor.execute(
"INSERT INTO flex(date, Store, Vendor, Shelf)"
"VALUES({},{},{},{})", row)
cnx.commit()
cursor.close()
cnx.close()
print("Done")
The error I get :
C:\Users\Iw4n\PycharmProjects\Learning\venv\Scripts\python.exe C:/Users/Iw4n/PycharmProjects/Learning/Orange_android_MySQL_insertion.py
Traceback (most recent call last):
File "C:/Users/Iw4n/PycharmProjects/Learning/Orange_android_MySQL_insertion.py", line 15, in <module>
cursor.execute(
File "C:\Users\Iw4n\PycharmProjects\Learning\venv\lib\site-packages\mysql\connector\cursor.py", line 551, in execute
self._handle_result(self._connection.cmd_query(stmt))
File "C:\Users\Iw4n\PycharmProjects\Learning\venv\lib\site-packages\mysql\connector\connection.py", line 490, in cmd_query
result = self._handle_result(self._send_cmd(ServerCmd.QUERY, query))
File "C:\Users\Iw4n\PycharmProjects\Learning\venv\lib\site-packages\mysql\connector\connection.py", line 395, in _handle_result
raise errors.get_exception(packet)
mysql.connector.errors.ProgrammingError: 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '},{},{},{})' at line 1
When i wrapped {} into '' , as many rows as were in csv been inserted into datbase as {},{}
same story goes for %s if I use it , i got the same error as above, when it's wrapped in '' , %s is insetred into database.
I also found information to add f in fron of "INSERT~ but it did not help.
Can anyone give me some suggestion on how to overcome this and correctly insert data to MySQL ?
Final code that is working as intended :
import mysql.connector
import csv
andreport = 'testowa.csv'
cnx = mysql.connector.connect(
user='xxxxx',
password='xxxxx',
host='xxxxx',
database='xxxxx')
cursor = cnx.cursor()
with open(andreport, mode='r') as csv_data:
reader = csv.reader(csv_data, delimiter=';')
csv_data_list = list(reader)
for row in csv_data_list:
cursor.execute("""
INSERT INTO flex(
date, Agency, MediaSource, Campaign)
VALUES(%s,%s,%s,%s)""",
(row[0], row[1], row[2], row[3]))
cnx.commit()
cursor.close()
cnx.close()
print("Done")

I'm guessing that seems the problem is that you passed one argument (row) instead of four. So try this:
cursor.execute("""
INSERT INTO flex(date, Store, Vendor, Shelf)
VALUES(%s,%s,%s,%s)""",(row[0], row[1], row[2], row[3], ))

Looking at the documentation for MySQLCursor.excute() method, it seems like adding some %s as the parameters in your insert statement might fix this?
import mysql.connector
import csv
andreport = 'testowa.csv'
cnx = mysql.connector.connect(
user='xxxxx',
password='xxxxx',
host='xxxxxx',
database='xxxxx')
cursor = cnx.cursor()
insert_statement = (
"INSERT INTO flex(date, Store, Vendor, Shelf)"
"VALUES (%s, %s, %s, %s)"
)
with open(andreport, mode='r') as csv_data:
reader = csv.reader(csv_data, delimiter=';')
csv_data_list = list(reader)
for row in csv_data_list:
cursor.execute(insert_statement, row)
cnx.commit()
cursor.close()
cnx.close()
print("Done")
Let me know if this gets you anywhere, or if you see a new error!
Edit: updated CSV reading to convert to a list.

Unable to import CSV file data to mysql table

I am using the code below-
import mysql.connector
import csv
mydb = mysql.connector.connect(host='xxxxx', user='xxxx', passwd='xxxxxx')
cursor = mydb.cursor()
cursor.execute("SHOW DATABASES")
l = cursor.fetchall()
cursor.execute("USE DB ")
with open('details.csv','rt')as f:
csv_data = csv.reader(f)
for row in csv_data:
cursor.execute ('INSERT INTO student (id,name,age,course) VALUES (%s,%s,%s,%s)',row)
cursor.close()
mydb.commit()
mydb.close()
I am getting the following error-
"ProgrammingError: Not all parameters were used in the SQL statement"
python 3.x,windows7,Mysql 2012 version.

for row in csv_data:
listval = []
for col in row:
listval.append(col)
cursor.execute ('INSERT INTO student (id,name,age,course) VALUES (%s,%s,%s,%s) ', listval)
This will work :))

In this case, the main problem is the string format. I did't know what object is row, in your error it is a list, so using each element will solve the issue.
for row in csv_data:
cursor.execute ('INSERT INTO student (id,name,age,course) VALUES (%s,%s,%s,%s)',
row[0], row[1], row[2], row[3])

How to insert into a table with character['] in the field (pymssql)

I'm trying to populate my db from a csv file using python.
Below is the code I use to populate my sales table:
import csv
import pymssql as psql
conn = psql.connect('localhost:8888', 'SA', 'superSecret','videogame')
cursor = conn.cursor()
cursor.execute("""
IF OBJECT_ID('sales', 'U') IS NOT NULL
DROP TABLE sales
CREATE TABLE sales
(
Id int,
Name varchar(250),
Platform varchar(250),
Year int,
Genre varchar(250),
Publisher varchar(250),
NA_Sales float,
EU_Sales float,
JP_Sales float,
Other_Sales float,
Global_Sales float
)
""")
conn.commit()
with open ('./sales.csv', 'r') as f:
reader = csv.reader(f)
for row in reader:
row[1] = row[1].replace("'", "")
row[5] = row[5].replace("'", "")
data = tuple(row)
query = 'insert into sales values {0}'.format(data).replace("N/A","0")
print(query)
cursor.execute(query)
conn.commit()
conn.close()
However, some of my data contains the character:(') (e.g. Assassin's creed)in their name column. This caused an error, as below:
insert into sales values ('129', "Assassin's Creed III", 'PS3', '2012', 'Action', 'Ubisoft', '2.64', '2.56', '0.16', '1.14', '6.5')
Traceback (most recent call last):
File "pymssql.pyx", line 447, in pymssql.Cursor.execute (pymssql.c:7119)
File "_mssql.pyx", line 1011, in _mssql.MSSQLConnection.execute_query (_mssql.c:11586)
File "_mssql.pyx", line 1042, in _mssql.MSSQLConnection.execute_query (_mssql.c:11466)
File "_mssql.pyx", line 1175, in _mssql.MSSQLConnection.format_and_run_query (_mssql.c:12746)
File "_mssql.pyx", line 1586, in _mssql.check_cancel_and_raise (_mssql.c:16880)
File "_mssql.pyx", line 1630, in _mssql.maybe_raise_MSSQLDatabaseException (_mssql.c:17524)
_mssql.MSSQLDatabaseException: (207, b"Invalid column name 'Assassin's Creed III'.DB-Lib error message 20018, severity 16:\nGeneral SQL Server error: Check messages from the SQL Server\n")
Is there any workaround for this other than manually update the row (e.g. row[1] = row[1].replace("'","")?
Thanks!!

You could use a proper parameterized query, like this:
row = ["Assassin's", "N/A", 9] # test data as list (e.g., from CSV)
data = tuple("0" if x=="N/A" else x for x in row)
print(data) # ("Assassin's", '0', 9)
placeholders = ','.join(['%s' for i in range(len(data))])
query = 'INSERT INTO sales VALUES ({0})'.format(placeholders)
print(query) # INSERT INTO sales VALUES (%s,%s,%s)
cursor.execute(query, data)

You can replace the ' with a \', which should stop it crashing whilst preserving the apostrophe in your data:
with open ('./sales.csv', 'r') as f:
reader = csv.reader(f)
for row in reader:
row[1] = row[1].replace("'", "\'")
row[5] = row[5].replace("'", "\'")
data = tuple(row)
query = 'insert into sales values {0}'.format(data).replace("N/A","0")
print(query)
cursor.execute(query)

Writing a csv file into SQL Server database using python

I am trying to write a csv file into a table in SQL Server database using python. I am facing errors when I pass the parameters , but I don't face any error when I do it manually. Here is the code I am executing.
cur=cnxn.cursor() # Get the cursor
csv_data = csv.reader(file(Samplefile.csv')) # Read the csv
for rows in csv_data: # Iterate through csv
cur.execute("INSERT INTO MyTable(Col1,Col2,Col3,Col4) VALUES (?,?,?,?)",rows)
cnxn.commit()
Error:
pyodbc.DataError: ('22001', '[22001] [Microsoft][ODBC SQL Server Driver][SQL Server]String or binary data would be truncated. (8152) (SQLExecDirectW); [01000] [Microsoft][ODBC SQL Server Driver][SQL Server]The statement has been terminated. (3621)')
However when I insert the values manually. It works fine
cur.execute("INSERT INTO MyTable(Col1,Col2,Col3,Col4) VALUES (?,?,?,?)",'A','B','C','D')
I have ensured that the TABLE is there in the database, data types are consistent with the data I am passing. Connection and cursor are also correct. The data type of rows is "list"

Consider building the query dynamically to ensure the number of placeholders matches your table and CSV file format. Then it's just a matter of ensuring your table and CSV file are correct, instead of checking that you typed enough ? placeholders in your code.
The following example assumes
CSV file contains column names in the first line
Connection is already built
File name is test.csv
Table name is MyTable
Python 3
...
with open ('test.csv', 'r') as f:
reader = csv.reader(f)
columns = next(reader)
query = 'insert into MyTable({0}) values ({1})'
query = query.format(','.join(columns), ','.join('?' * len(columns)))
cursor = connection.cursor()
for data in reader:
cursor.execute(query, data)
cursor.commit()
If column names are not included in the file:
...
with open ('test.csv', 'r') as f:
reader = csv.reader(f)
data = next(reader)
query = 'insert into MyTable values ({0})'
query = query.format(','.join('?' * len(data)))
cursor = connection.cursor()
cursor.execute(query, data)
for data in reader:
cursor.execute(query, data)
cursor.commit()

I modified the code written above by Brian as follows since the one posted above wouldn't work on the delimited files that I was trying to upload. The line row.pop() can also be ignored as it was necessary only for the set of files that I was trying to upload.
import csv
def upload_table(path, filename, delim, cursor):
"""
Function to upload flat file to sqlserver
"""
tbl = filename.split('.')[0]
cnt = 0
with open (path + filename, 'r') as f:
reader = csv.reader(f, delimiter=delim)
for row in reader:
row.pop() # can be commented out
row = ['NULL' if val == '' else val for val in row]
row = [x.replace("'", "''") for x in row]
out = "'" + "', '".join(str(item) for item in row) + "'"
out = out.replace("'NULL'", 'NULL')
query = "INSERT INTO " + tbl + " VALUES (" + out + ")"
cursor.execute(query)
cnt = cnt + 1
if cnt % 10000 == 0:
cursor.commit()
cursor.commit()
print("Uploaded " + str(cnt) + " rows into table " + tbl + ".")

You can pass the columns as arguments. For example:
for rows in csv_data: # Iterate through csv
cur.execute("INSERT INTO MyTable(Col1,Col2,Col3,Col4) VALUES (?,?,?,?)", *rows)

If you are using MySqlHook in airflow , if cursor.execute() with params throw san error
TypeError: not all arguments converted during string formatting
use %s instead of ?
with open('/usr/local/airflow/files/ifsc_details.csv','r') as csv_file:
csv_reader = csv.reader(csv_file)
columns = next(csv_reader)
query = '''insert into ifsc_details({0}) values({1});'''
query = query.format(','.join(columns), ','.join(['%s'] * len(columns)))
mysql = MySqlHook(mysql_conn_id='local_mysql')
conn = mysql.get_conn()
cursor = conn.cursor()
for data in csv_reader:
cursor.execute(query, data)
cursor.commit()

I got it sorted out. The error was due to the size restriction restriction of table. It changed the column capacity like from col1 varchar(10) to col1 varchar(35) etc. Now it's working fine.

Here is the script and hope this works for you:
import pandas as pd
import pyodbc as pc
connection_string = "Driver=SQL Server;Server=localhost;Database={0};Trusted_Connection=Yes;"
cnxn = pc.connect(connection_string.format("DataBaseNameHere"), autocommit=True)
cur=cnxn.cursor()
df= pd.read_csv("your_filepath_and_filename_here.csv").fillna('')
query = 'insert into TableName({0}) values ({1})'
query = query.format(','.join(df.columns), ','.join('?' * len(df1.columns)))
cur.fast_executemany = True
cur.executemany(query, df.values.tolist())
cnxn.close()

You can also import data into SQL by using either:
The SQL Server Import and Export Wizard
SQL Server Integration Services (SSIS)
The OPENROWSET function
More details can be found on this webpage:
https://learn.microsoft.com/en-us/sql/relational-databases/import-export/import-data-from-excel-to-sql?view=sql-server-2017

Not enough argument for format string while importing csv into MySQL database

Full Traceback:
File "./csvimportdb.py", line 12, in <module>
cursor.execute('''INSERT INTO newsletter_subscriber(id, name, email ) VALUES("%s", "%s", "%s")''', row)
File "/usr/lib64/python2.6/site-packages/MySQLdb/cursors.py", line 159, in execute
query = query % db.literal(args)
TypeError: not enough arguments for format string
My Code:
#!/usr/bin/python
import csv
import MySQLdb
mydb = MySQLdb.connect(host='localhost', user='english', passwd='english', db='english_mez')
cursor = mydb.cursor()
csv_data = csv.reader(file('final.csv'))
for row in csv_data:
cursor.execute('INSERT INTO newsletter_subscriber(id, name, email )' 'VALUES("%s", "%s", "%s")', row[0], row[1], row[2])
#close the connection to the database.
mydb.commit()
cursor.close()
print "Done"
I need to pass row, row, row to make it right but can't do that. How to fix?
Edit: Printing row gives:
['6630\tCarmen Rocche\trocchecarmen#gmail.com\t\t\t\t\t']
['6631\tSuhasini\tkkalva14#hotmail.com\t\t\t\t\t']
['6632\tAmarjeet \tsweetylamba#gmail.com\t\t\t\t\t']
['6633\tFazali Hadi\tshewasb#yahoo.com\t\t\t\t\t']
['6634\tVishaka Samarakone\tshirashi.vishaka#gmail.com\t\t\t\t\t']
['6635\tLoemongga\tloemongga#yahoo.com\t\t\t\t\t']

for row in csv_data:
data=row[0].split('\t')
if len(data) < 4: continue
query="""insert into newsletter_subscriber (id, name, email) values
(%d, '%s', '%s')""" %(int(data[0]), data[1], data[2])
cursor.execute(query)