pyodbc.ProgrammingError: No results. Previous SQL was not a query, when executing multiple statements at once

问题

i am dealing with sql server database,

where i have a table named 'table1' containing 1 column and 1 row

exp_num
0

I am trying to update the 0 value exp_num column to +1 and also return old experiment and updated experiment.

For this i am using declare statements.

DECLARE @UpdateOutput1 table (Oldexp_num int,Newexp_num int);

UPDATE get_exp_num
    SET exp_num = exp_num+1

OUTPUT
    DELETED.exp_num,
    INSERTED.exp_num
  INTO @UpdateOutput1;

 select * from @UpdateOutput1

When i'm running this in SQL editor i am getting the results.

Oldexp_num   Newexp_num
    0             1

but if i make this same as a query, and try to use pyodbc package i am getting error.

import pyodbc

connection = pyodbc.connect()  # i am getting a connection
query = "DECLARE @UpdateOutput1 table (Oldexp_num int,Newexp_num int);UPDATE get_exp_num SET exp_num = exp_num+1 OUTPUT DELETED.exp_num, INSERTED.exp_num INTO @UpdateOutput1; select Newexp_num from @UpdateOutput1;"
cursor = connection.cursor()
cursor.execute(query)
cursor.fetchone()

When im doing cursor.fetchone() , i am getting following error.

File "<ipython-input-1398-bdaba305080c>", line 1, in <module>
    cursor.fetchone()

ProgrammingError: No results.  Previous SQL was not a query.

Is there any error in pyodbc package? or in my query

回答1:

The problem was solved by adding SET NOCOUNT ON; to the beginning of the anonymous code block. That statement suppresses the record count values generated by DML statements like UPDATE ... and allows the result set to be retrieved directly.

来源：https://stackoverflow.com/questions/48061304/pyodbc-programmingerror-no-results-previous-sql-was-not-a-query-when-executin

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