Python Sql query parameterized-CodePudding

I need to make a function with parameterized values to loop different queries with the same structure, I wrote the following code:

import pandas as pd
cnxn_str = ("Driver={SQL Server Native Client 10.0};"
            "Server=xx.xxx.xxx.xx,xx;"
            "Database=dbase;"
            "UID=sa;"
            "PWD=pswd;")
cnxn = pyodbc.connect(cnxn_str)

cursor = cnxn.cursor()

def TRX(tbl_name, var_value):
  import pandas as pd
  #route by hour----
  query = print("SELECT TOP 100 * FROM [DB].[dbo]."   tbl_name   " WHERE var1 IN ('"   var_value   "')") 
  df = pd.read_sql_query(query, cnxn)
  return(df)

When I run it, for example:

TRX(tbl_name = '[table1]', var_value = 'a')

It returns the following error:

DatabaseError: Execution failed on sql 'None': The first argument to execute must be a string or unicode query.

Which approach should I use?

CodePudding user response：

I think this should work

query_sql = ''' SELECT COL FROM {} WHERE COL = '{}' '''.format(table_name, col_value)