I have a connection with :
url = urlparse.urlparse(os.environ["DATABASE_URL"])
self.conn = psycopg2.connect(
database=url.path[1:],
user=url.username,
password=url.password,
host=url.hostname,
port=url.port
)
When I run the query to insert self.cursor.execute("INSERT INTO Divers (email, hashpass) VALUES (%s, %s);",[email, password]) it returns successfully.
However, when I check my data the registration isn't there. When I run this query through the CLI it inserts but the incremented id is increased as if values had been inserted. Pleas help.
The documentation shows a commit() method commit. So you probably want to try using it like this:
self.conn.commit()
Related
I have a python script which needs to update a mysql database, I have so far:
dbb = MySQLdb.connect(host="localhost",
user="user",
passwd="pass",
db="database")
try:
curb = dbb.cursor()
curb.execute ("UPDATE RadioGroups SET CurrentState=1 WHERE RadioID=11")
print "Row(s) were updated :" + str(curb.rowcount)
curb.close()
except MySQLdb.Error, e:
print "query failed<br/>"
print e
The script prints Row(s) were updated : with the correct number of rows which have a RadioID of 11. If I change the RadioID to another number not present in the table it will say Row(s) were updated :0. However the database doesn't actually update. The CurrentState field just stays the same. If I copy and past the SQL statement in to PHPMyAdmin it works fine.
use
dbb.commit()
after
curb.execute ("UPDATE RadioGroups SET CurrentState=1 WHERE RadioID=11")
to commit all the changes that you 'loaded' into the mysql server
As the #Lazykiddy pointed out, you have to commit your changes after you load them into the mysql.
You could also use this approach to enable the auto commit setting, just after the MySQL connection initialization:
dbb.autocommit(True)
Then, it will automatically commit the changes you made during your code execution.
the two answers are correct. However, you can also do this:
dbb = MySQLdb.connect(host="localhost",
user="user",
passwd="pass",
db="database",
autocommit=True)
add autocommit=True
I am trying to execute stored procedure by using pyodbc in databricks, after executing SP I tried to commit the connection but, commit is not happening. Here I am giving my code, please help me out from this issue.
import pyodbc
#### Connecting Azure SQL
def db_connection():
try:
username = "starsusername"
password = "password-db"
server = "server-name"
database_name = "db-name2"
port = "db-port"
conn=pyodbc.connect('Driver={ODBC Driver 17 for SQL server};SERVER=tcp:'+server+','+port+';DATABASE='+ database_name +';UID='+ username +';PWD='+ password)
cursor=conn.cursor()
return cursor, conn
except Exception as e:
print("Faild to Connect AZURE SQL: \n"+str(e))
cursor, conn = db_connection()
# conn1.autocommit=True
cursor.execute("delete from db.table_name")
cursor.execute("insert into db.table_name(BUSINESS_DATE) values('2021-10-02')")
cursor.execute("exec db.SP_NAME '20211023'")
conn.commit()
conn.close()
here I am commiting connection after SP excution. deletion and insertion is not happening at all. and I tried with cursor.execute("SET NOCOUNT ON; exec db.SP_NAME '20211023'") but it's also not working.
Thanks in Advance
If you check this document on pyodbc, you will find that -
To call a stored procedure right now, pass the call to the execute method using either a format your database recognizes or using the ODBC call escape format. The ODBC driver will then reformat the call for you to match the given database.
Note that after connection is set up or done, try doing conn.autocommit = True before calling your SP and it will help. By default it is false.
Executing the Stored Procedure.
You will be able to execute your stored procedure if you follow the below code snippet.
cursor = conn.cursor()
conn.autocommit = True
executesp = """EXEC yourstoredprocedure """
cursor.execute(executesp)
conn.commit()
Delete the Records in SQL Server
You can delete record as shown in the below example.
...#just an example
cursor.execute('''
DELETE FROM product
WHERE product_id in (5,6)
''')
conn.commit()
Don’t forget to add conn.commit() at the end of the code, to ensure that the command would get executed.
Insert record in SQL Server
The below snippet show how we can do the same.
...#just an example
cursor.execute("INSERT INTO EMP (EMPNO, ENAME, JOB, MGR) VALUES (535, 'Scott', 'Manager', 545)")
conn.commit()
I will suggest you to read the for following document for more information.
Delete Record Documentation.
Insert Record Document
I have a code like this:
import mysql.connector as mysql
from generate_records import generateRecords
devicesQuery = "CALL iot.sp_sensors_overview()"
try:
db = mysql.connect(
user = "username",
password = "password",
host = "hostname",
database="iot"
)
cursor = db.cursor(dictionary=True, buffered=True)
cursor.execute(devicesQuery)
for sensor in cursor:
generateRecords(sensor, db)
cursor.close()
except mysql.connector.Error as error:
print("Error:")
print(error)
else:
db.close()
The purpose of generateRecords function is obviously to generate records and run the INSERT query against the different table.
Seems like I do something wrong, because no matter what I trying, I getting different errors here, like mysql.connector.errors.OperationalError: MySQL Connection not available..
(upd) I also tried to change the code like it was suggested (see example bellow), with no luck - I still receiving the MySQL connection not available. error.
rows = cursor.fetchall()
cursor.close()
for sensor in rows:
cursor2 = db.cursor()
generateRecords(sensor, cursor2)
So, should I create a new connection within generateRecords function, or pass something different within it, or use some kind of different approach here?
Thank you!
Finally I found what was wrong. I'm used the query to call the stored procedure. Using the cursor.callproc("sp_sensors_overview") instead fixed my issue, and now I'm able to create the next cursor without errors.
I have looked at similar questions but nothing has worked for me so far
So here it is. I want to update my table through a python script. I'm using the module cx_oracle. I can execute a SELECT query but whenever I try to execute an UPDATE query, my program just hangs (freezes). I realize that I need to use cursor.commit() after cursor.execute() if I am updating a table but my code never gets past cursor.commit(). I have added a code snippet below that I am using to debug.
Any suggestions??
Code
import cx_Oracle
def getConnection():
ip = '127.0.0.1'
port = 1521
service_name = 'ORCLCDB.localdomain'
username = 'username'
password = 'password'
dsn = cx_Oracle.makedsn(ip, port, service_name=service_name) # (CONNECT_DATA=(SERVICE_NAME=ORCLCDB.localdomain)))
return cx_Oracle.connect(username, password, dsn) # connection
def debugging():
con = getConnection()
print(con)
cur = con.cursor()
print('Updating')
cur.execute('UPDATE EMPLOYEE SET LATITUDE = 53.540943 WHERE EMPLOYEEID = 1')
print('committing')
con.commit()
con.close()
print('done')
debugging()
**Here is the corresponding output: **
<cx_Oracle.Connection to username#(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCLCDB.localdomain)))>
Updating
Solution
After a bit of poking around, I found the underlying cause! I had made changes to the table using Oracle SQL Developer but had not committed them, when the python script tried to make changes to the table it would freeze up because of this. To avoid the freeze, I committed my changes in oracle sql developer before running the python script and it worked fine!
Do you have any option to look in the database ? I mean , in order to understand whether is a problem of the python program or not, we need to check the v$session in the database to understand whether something is blocked.
select sid, event, last_call_et, status from v$session where sid = xxx
Where xxx is the sid of the session which has connected with python.
By the way, I would choose to commit explicitly after cursor execute
cur.execute('UPDATE EMPLOYEE SET LATITUDE = 53.540943 WHERE EMPLOYEEID = 1')
con.commit()
Hope it helps
Best
The purpose is to check if the email already exists in the database utilizing python and MySQLdb. I am using the variable mail to store the e-mail. The MySQL form is email. I have the code below:
if cursor.execute("select count(*) from registrants where email = " + "'"email2"'") == 0:
print "it doesn't exist!"
What is wrong with this statement or how can I go about doing this?
I hardly know where to start.
Just typing a string of SQL into a Python program doesn't somehow query the database. You actually have to open a database connection, instantiate a cursor, use that cursor to run the SQL, and fetch the result. All this is explained in the MySQLdb documentation.
Once you've done that, you'll still need to actually pass the email parameter from your form to the SQL statement, which you're not doing either.
well that won't work because that's just the mysql query string. You have to execute this query using a mysql client receive the results and the test. Using pymysql would be something like this:
import pymysql
connection = pymysql.connect(host,user,password,database)
cursor = connection.cursor()
cursor.execute("select count(*) from registrants where email = ?") #you need to replace the ? with some actual value or the query will fail
result = cur.fetchone()
if result[0]==0:
print "E-mail does not exist!"