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
Related
I am currently developing a program in python that interacts with multiple database. I am using pyodbc to connect, and execute queries. One of the database is an azure database. I noticed sometimes the sent data is not updated in the database although the program run successfully and no error was thrown. Is there any practices that i should follow to make sure this doesn't happen or is this related to my code or db connection issue? I am a beginner. Would appreciate everyone's help thank you!
Also is the .commit() line should be run after every sql run?
The program should be updating a row of data in the database based on a condition, this particular query sometimes doesn't take effect, but no error was thrown. I also executed multiple queries after that, no issue was found for the next queries. It is successfully executed.
the query is a simple query which is
UPDATE DraftVReg SET VRStatus = 'Potential Duplicate Found' WHERE RowID = ?
I tried to reproduce your scenario on my end and was able to update the SQL row in the Azure SQL DB with Pyodbc module.
Yes, Its very necessary to use
conn.commit
to commit your changes inside a database after you perform operations such as Update or Insert inside Azure SQL DB programmatically.
1) Fetch Data with Select statement.
I was able to fetch the Table’s data successfully with Select * from ‘Tablename’ query inside pyodbc code before I try UPDATE statement.
import pyodbc
conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};''SERVER=tcp:sqlservernamesql.database.windows.net,1433;''DATABASE=databasename; UID=siliconuser;PWD=Password;')
#conn.commit()
cursor = conn.cursor()
cursor.execute('Select * FROM StudentReviews')
#conn.commit()
for i in cursor:
print(i)
cursor.close()
conn.close()
Result:-
2) UPDATE the rows require conn.commit()
Code :-
import pyodbc
conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};''SERVER=tcp:siliconserversql.database.windows.net,1433;''DATABASE=silicondb; UID=userid; PWD=Password;')
cursor = conn.cursor()
#cursor.execute('Select * FROM StudentReviews')
cursor.execute("UPDATE StudentReviews SET ReviewTime = ('7') WHERE ReviewText = ('SQL DB')")
conn.commit()
cursor.close()
conn.close()
Result:-
Update statement Executed successfully and the Table Row was updated in Azure SQL, Refer Below :-
3) With autocommit=true
Thank you #Gord thompson for the comment and suggestion!
Code :-
import pyodbc
conn = pyodbc.connect('DRIVER={ODBC Driver 17 for SQL Server};''SERVER=tcp:siliconserversql.database.windows.net,1433;''DATABASE=silicondb; UID=username; PWD=Password;', autocommit=True)
#conn.commit()
cursor = conn.cursor()
cursor.execute("UPDATE StudentReviews SET ReviewTime = ('8') WHERE ReviewText = ('SQL DB')")
cursor.close()
conn.close()
Results :- With autocommit=true, You do not need to add conn.commit everytime you update the SQL DB.
I have an issue with inserting data into a database using the python package pyodbc and since I am pretty new to pyodbc & databases in general, I might lack some basic understanding.
I open a connection, and then I want the execute my query.
Actually, in this query I call a stored procedure (which I didn't write and I am not allowed to change!).
This procedure does "one or two" inserts. When I use pyodbc like this
conn = pyodbc.connect(connection_string)
with conn:
c = conn.cursor()
c.execute("{call input_procedure('some','parameters','to','insert')}")
OR
conn = pyodbc.connect(connection_string)
c = conn.cursor()
c.execute("{call input_procedure('some','parameters','to','insert')}")
conn.commit()
I get the following error message:
pyodbc.Error: ('HY000', "[HY000] [MySQL][ODBC 8.0(a) Driver]Commands out of sync; you can't run this command now (2014) (SQLEndTran(SQL_COMMIT))")
As far as I understood, this error message might be due to executing more than one insert within the called procedure. When I print the return of the execute command I become the following: (' ', )
When I instead close the cursor, before doing the commit, everything works fine. Like this:
conn = pyodbc.connect(connection_string)
c = conn.cursor()
c.execute("{call input_procedure('some','parameters','to','insert')}")
c.close()
conn.commit()
I really don't understand what's happening here.
Is there an explanation for this behaviour? Is closing the cursor before doing the commit save?
Thanks a lot for your help!
You seem to have encountered a quirk in MySQL Connector/ODBC's handling of result sets from a stored procedure. For this example procedure:
CREATE DEFINER=`root`#`localhost` PROCEDURE `input_procedure`(IN `p1` VARCHAR(50))
MODIFIES SQL DATA
BEGIN
INSERT INTO table1 (txt) VALUES (p1);
SELECT '' AS foo;
END
this Python code
crsr = cnxn.cursor()
crsr.execute("{call input_procedure('thing')}")
cnxn.commit()
throws the "Commands out of sync" error, whereas this code
crsr = cnxn.cursor()
crsr.execute("{call input_procedure('thing')}")
while crsr.nextset():
pass
cnxn.commit()
does not.
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
I would like to run below postgresql function queries in python but I keep getting error message says
cursor = connection.cursor()
cursor.execute("SELECT
ST_Distance_sphere(st_makepoint(32.836956,39.925018)
,st_makepoint(28.990174,41.036857))")
df = cursor.fetchall()
df
InFailedSqlTransaction: current transaction is aborted, commands ignored until end of transaction block
How can I fix this? Thank you.
According to psycopg docs, you probably have an error in your command (SQL).
There was a problem in the previous command to the database, which
resulted in an error. The database will not recover automatically from
this condition: you must run a rollback() before sending new commands
to the session (if this seems too harsh, remember that PostgreSQL
supports nested transactions using the SAVEPOINT command).
I highly recommend using try/except/finally clause in your database connections. Or use with statement.
Here is an example from http://www.postgresqltutorial.com/postgresql-python/transaction/:
conn = psycopg2.connect(dsn)
# transaction 1
with conn:
with conn.cursor() as cur:
cur.execute(sql)
# transaction 2
with conn:
with conn.cursor() as cur:
cur.execute(sql)
conn.close()
query = "delete from mytable where id =10"
cursor = connection.cursor()
cursor.execute(query)
It returns None but I want to know the response of the query. How do I get the result?
Same as insert statement also. Could anyone give me the solution?
I had a quick look at docs:
Django / DB docs: https://docs.djangoproject.com/en/dev/topics/db/sql/
The object django.db.connection represents the default database connection, and django.db.transaction represents the default database transaction. To use the database connection, call connection.cursor() to get a cursor object. Then, call cursor.execute(sql, [params]) to execute the SQL and cursor.fetchone() or cursor.fetchall() to return the resulting rows.
And Mysql / Python docs: http://www.tutorialspoint.com/python/python_database_access.htm
Commit after executing the query :
# Prepare SQL query to DELETE required records
sql = "delete from mytable where id =10"
try:
# Execute the SQL command
cursor.execute(sql)
# Commit your changes in the database
db.commit()
except:
# Rollback in case there is any error
db.rollback()
I hope this helps.