I have a pymysql update query that I want to work. It keeps throwing me an error.
mydb = mysql.connector.connect(
host="*****",
user="****",
password="****",
database="database",
port="****"
)
mycursor = mydb.cursor()
mycursor.execute ("""
UPDATE table1
SET BUGS=%s, CODE_SMELLS=%s, VULNERABILITIES=%s
WHERE username = %s
AND time_created = (SELECT MAX(time_created) FROM table1
)
""", (bugs, code_smells, vulnerabilities, username))
mydb.commit()
mydb.close()
mysql.connector.errors.DatabaseError: 1093 (HY000): You can't specify target table 'table1' for update in FROM clause
Try
UPDATE table1
SET BUGS=%s, CODE_SMELLS=%s, VULNERABILITIES=%s
WHERE username = %s
ORDER BY time_created DESC
LIMIT 1
or use a subquery that creates a temp table. So you will not update directly the table you are selecting from.
UPDATE table1
SET BUGS=%s, CODE_SMELLS=%s, VULNERABILITIES=%s
WHERE username = %s
AND time_created =
(
SELECT * FROM
(
SELECT MAX(time_created) FROM table1
) tmp
)
Related
I am using mysql.connector in Python to manage particular database, I am trying to check in a table if there is any tuple or row that meet a condition, here is the code:
db_campaign = mysql.connector.connect(
host="localhost",
user="root",
passwd="pass",
database="campaign"
)
cursor = db_campaign.cursor()
query = "SELECT EXISTS(SELECT * FROM transaction WHERE id = 10)"
cursor.execute(query)
for val in cursor:
if val[0] == 1:
found = True
Is there any way to make this cleaner?
cursor = db_campaign.cursor()
query = "SELECT 1 FROM transaction WHERE id = 10)"
cursor.execute(query)
return cursor.fetchone() is not Non
You can also test len(cursor.fetchall())
I'm trying to select certain records from the civicrm_address table and update the geocode columns. I use fetchall to retrieve the rows then, within the same loop, I try to update with the results of the geocoder API, passing the civicrm_address.id value in the update_sql statement.
The rowcount after the attempted update and commit is always -1 so I am assuming it failed for some reason but I have yet to figure out why.
import geocoder
import mysql.connector
mydb = mysql.connector.connect(
[redacted]
)
mycursor = mydb.cursor(dictionary=True)
update_cursor = mydb.cursor()
sql = """
select
a.id
, street_address
, city
, abbreviation
from
civicrm_address a
, civicrm_state_province b
where
location_type_id = 6
and
a.state_province_id = b.id
and
street_address is not null
and
city is not null
limit 5
"""
mycursor.execute(sql)
rows = mycursor.fetchall()
print(mycursor.rowcount, "records selected")
for row in rows:
address_id = int(row["id"])
street_address = str(row["street_address"])
city = str(row["city"])
state = str(row["abbreviation"])
myaddress = street_address + " " + city + ", " + state
g = geocoder.arcgis(myaddress)
d = g.json
latitude = d["lat"]
longitude = d["lng"]
update_sql = """
begin work;
update
civicrm_address
set
geo_code_1 = %s
, geo_code_2 = %s
where
id = %s
"""
var=(latitude, longitude, address_id)
print(var)
update_cursor.execute(update_sql, var, multi=True)
mydb.commit()
print(update_cursor.rowcount)
mycursor.close()
update_cursor.close()
mydb.close()
Here is a simpler script:
I have executed the update_sql statement directly in the MySQL workbench and it succeeds. It is not working from Python.
import geocoder
import mysql.connector
try:
mydb = mysql.connector.connect(
[redacted]
)
mycursor = mydb.cursor(dictionary=True)
update_cursor = mydb.cursor()
update_sql = """
begin work;
update
civicrm_address
set
geo_code_1 = 37.3445
, geo_code_2 = -118.5366074
where
id = 65450;
"""
update_cursor.execute(update_sql, multi=True)
mydb.commit()
print(update_cursor.rowcount, "row(s) were updated")
except mysql.connector.Error as error:
print("Failed to update record to database: {}".format(error))
mydb.rollback()
finally:
# closing database connection.
if (mydb.is_connected()):
mydb.close()
I have it working now. I did remove the "begin work" statement but not the multi=True and it wouldn't work. Later I removed the multi=True statement and it works.
I have two variables to insert in my table.
user_id - int
marks - float
and I am having this data for multiple users like this:
user_ids = (-,-,-,-,-,-,-) **TUPLE**
marks = (-,-,-,-,-,-,-,-) **TUPLE**
I want to insert this data into my table using executemany and I am executing this query in my flask snippet:
con = pymysql.connect(
host=host,
user=user,
password=password,
db=db,
charset=charset,
cursorclass=pymysql.cursors.DictCursor,
port=port,
)
cur = con.cursor()
percs = calcattnonull()
# percs contains list of dictionaries.
# {[<'user_id'>: <'marks'>], [<'user_id'>: <'marks'>]........}
id_ = []
perc_ = []
final = []
for perc in tqdm(percs):
id_.append(perc["user_id"])
perc_.append(perc["att_perc"])
id_ = tuple(id_)
perc_ = tuple(perc_)
final.append(id_)
final.append(perc_)
cur.executemany(
"UPDATE dream_offline_calculate SET (user_id,att_percentage) VALUES (?,?)",
final,
)
con.commit()
I am getting this error again and again:
TypeError: not all arguments converted during string formatting
Thanks in advance for helping me.
executemany takes an iterable of the same placeholders you would use when calling execute several times.
So if your original query would be
cur.execute(
"UPDATE dream_offline_calculate SET (user_id,att_percentage) VALUES (?,?)",
(user_id, att_perc),
)
the equivalent executemany would be
cur.executemany(
"UPDATE dream_offline_calculate SET (user_id,att_percentage) VALUES (?,?)",
[(user_id, att_perc)],
)
So that said, simply
cur.executemany(
"UPDATE dream_offline_calculate SET (user_id,att_percentage) VALUES (?,?)",
[(perc["user_id"], perc["att_perc"]) for perc in percs],
)
should do the trick.
I'm new to python and I want to update every record that has count 0 in the database. I have tried a lot can't find anything like help.
for row in cur.fetchall():
if row[3] == 0:
cur.execute("UPDATE tble SET count = 1 WHERE name = %s" %row[1])
Assuming your table has this structure:
CREATE TABLE `test` (
`sno` int(11) NOT NULL,
`name` varchar(50) NOT NULL,
`count` int(11) NOT NULL,
`dtCreated` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP
);
Here is the simple code code-
import pymysql
conn = pymysql.connect(host='localhost', unix_socket='', user='USER', passwd='PASSWORD', db='DATABASENAME')
cur = conn.cursor()
cur.execute("SELECT * FROM test")
for r in cur:
curr = conn.cursor()
sql = """UPDATE test SET count = 1 WHERE name = '%s'""" % r[1]
# print(sql)
try:
# Execute the SQL command
curr.execute(sql)
# Commit your changes in the database
conn.commit()
except:
# Rollback in case there is any error
conn.rollback()
curr.close()
cur.close()
conn.close()
Also, since you mentioned that you are new to python remember to commit, every time, whenever you run INSERT, UPDATE or DELETE like queries.
Hope it helps.
I am having trouble inserting a record into a MySQL database from python. This is what I am doing.
def testMain2():
conn = MySQLdb.connect(charset='utf8', host="localhost", user="root", passwd="root", db="epf")
cursor = conn.cursor()
tableName = "test_table"
columnsDef = "(export_date BIGINT, storefront_id INT, genre_id INT, album_id INT, album_rank INT)"
exStr = """CREATE TABLE %s %s""" % (tableName, columnsDef)
cursor.execute(exStr)
#Escape the record
values = ["1305104402172", "12", "34", "56", "78"]
values = [conn.literal(aField) for aField in values]
stringList = "(%s)" % (", ".join(values))
columns = "(export_date, storefront_id, genre_id, album_id, album_rank)"
insertStmt = """INSERT INTO %s %s VALUES %s""" % (tableName, columns, stringList)
cursor.execute(insertStmt)
cursor.close()
conn.close()
The table is created however nothing is in the table. I can run the INSERT statement successfully in Terminal with the same credentials.
Any suggestions on what I may be doing wrong?
You haven't committed the transaction.
conn.commit()
(The MySQLdb library sets autocommit to False when connecting to MySQL. This means that you need to manually call commit or your changes will never make it into the database.)