Pyodbc sql contains 0 parametric markers, but 1 parameter was supplied to 'hy000'
I am using Python 3.6, pyodbc and connecting to SQL Server.
I am trying to establish a database connection and then I am creating a query with parameters.
Here is the code:
import sys
import pyodbc
# connection parameters
nHost = 'host'
nBase = 'base'
nUser = 'user'
nPasw = 'pass'
# make connection start
def sqlconnect(nHost,nBase,nUser,nPasw):
try:
return pyodbc.connect('DRIVER={SQL Server};SERVER='+nHost+';DATABASE='+nBase+';UID='+nUser+';PWD='+nPasw)
print("connection successfull")
except:
print ("connection failed check authorization parameters")
con = sqlconnect(nHost,nBase,nUser,nPasw)
cursor = con.cursor()
# make connection stop
# if run WITHOUT parameters THEN everything is OK
ask = input ('Go WITHOUT parameters y/n ?')
if ask == 'y':
# SQL without parameters start
res = cursor.execute('''
SELECT * FROM TABLE
WHERE TABLE.TIMESTAMP BETWEEN '2017-03-01T00:00:00.000' AND '2017-03-01T01:00:00.000'
''')
# SQL without parameters stop
# print result to console start
row = res.fetchone()
while row:
print (row)
row = res.fetchone()
# print result to console stop
# if run WITH parameters THEN ERROR
ask = input ('Go WITH parameters y/n ?')
if ask == 'y':
# parameters start
STARTDATE = "'2017-03-01T00:00:00.000'"
ENDDATE = "'2017-03-01T01:00:00.000'"
# parameters end
# SQL with parameters start
res = cursor.execute('''
SELECT * FROM TABLE
WHERE TABLE.TIMESTAMP BETWEEN :STARTDATE AND :ENDDATE
''', {"STARTDATE": STARTDATE, "ENDDATE": ENDDATE})
# SQL with parameters stop
# print result to console start
row = res.fetchone()
while row:
print (row)
row = res.fetchone()
# print result to console stop
When I run the program with no parameters in SQL, it works.
When I try to run it with parameters, an error occured.
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4 answers
Parameters in an SQL statement via ODBC are positional and are marked with ?
. Thus:
# SQL with parameters start
res = cursor.execute('''
SELECT * FROM TABLE
WHERE TABLE.TIMESTAMP BETWEEN ? AND ?
''', STARTDATE, ENDDATE)
# SQL with parameters stop
It is also best to avoid passing dates as strings. Let pyodbc take care of using Python datetime:
from datetime import datetime ... STARTDATE = datetime(year=2017, month=3, day=1) ENDDATE = datetime(year=2017, month=3, day=1, hour=0, minute=0, second=1)
then just pass the parameters as above. If you prefer parsing strings, see this answer .
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I tried and had many different errors: 42000, 22007, 07002 and others
Working version below:
import sys
import pyodbc
import datetime
# connection parameters
nHost = 'host'
nBase = 'DBname'
nUser = 'user'
nPasw = 'pass'
# make connection start
def sqlconnect(nHost,nBase,nUser,nPasw):
try:
return pyodbc.connect('DRIVER={SQL Server};SERVER='+nHost+';DATABASE='+nBase+';UID='+nUser+';PWD='+nPasw)
except:
print ("connection failed check authorization parameters")
con = sqlconnect(nHost,nBase,nUser,nPasw)
cursor = con.cursor()
# make connection stop
STARTDATE = '11/2/2017'
ENDDATE = '12/2/2017'
params = (STARTDATE, ENDDATE)
# SQL with parameters start
sql = ('''
SELECT * FROM TABLE
WHERE TABLE.TIMESTAMP BETWEEN CAST(? as datetime) AND CAST(? as datetime)
''')
# SQL with parameters stop
# print result to console start
query = cursor.execute(sql, params)
row = query.fetchone()
while row:
print (row)
row = query.fetchone()
# print result to console stop
say = input ('everething is ok, you can close console')
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