Does FreeTDS ODBC + pyodbc support table-valued parameters (TVPs)? - pyodbc

Question

I'm working on unix/rhel7 system. I have installed require drivers for FreeTDS, unixODBC and pyodbc.Other query is working fine but when I'm trying execute stored proc with TVP (table valued parameter), its giving me error. Is there any way to connect SQL Server using windows service account from python?
Example:
import pyodbc;
cnxn = pyodbc.connect('DRIVER=FreeTDS;SERVER=SERVERNAME;PORT=1234;UID=USERNAME;PWD=PASSWORD;DATABASE=DBNAME')
cnxn.cursor()
param_array = []
for i in range(3):
param_array.append(['abc', 'adi', '/somepath/', '2021-01-04', 'NEW'])
result_array = cursor.execute("EXEC abc.stored_proc_name ?", [param_array]).fetchall()
cursor.commit()
cnxn.close()
Error:
pyodbc.Error: ('HY004', '[HY004] [FreeTDS][SQL Server]Invalid data type (0) (SQLBindParameter)')
So Is there any other way to connect SQL service account from python which supports TVP? Or Is there any solution in above example?

Answer 1

FreeTDS ODBC does not directly support table-valued parameters (TVPs) as discussed here. However we can use a temporary table and an anonymous code block to work around the issue. For a user-defined table type
USE [myDb]
GO
/****** Object: UserDefinedTableType [dbo].[dboListInt] Script Date: 2021-02-18 10:53:17 ******/
CREATE TYPE [dbo].[dboListInt] AS TABLE(
[Id] [int] NOT NULL,
PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (IGNORE_DUP_KEY = OFF)
)
GO
and a stored procedure that accepts that table type
USE [myDb]
GO
/****** Object: StoredProcedure [dbo].[dboPyOdbcTestTvp] Script Date: 2021-02-18 10:41:43 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE [dbo].[dboPyOdbcTestTvp](#tvp [dbo].dboListInt READONLY)
AS
BEGIN
SET NOCOUNT ON;
SELECT * FROM #tvp
END
we can call the stored procedure and retrieve the results like so:
import pyodbc
cnxn = pyodbc.connect(
"DRIVER=FreeTDS_1.2.18;"
"SERVER=192.168.0.179;"
"PORT=49242;"
"DATABASE=myDb;"
"UID=sa;PWD=_whatever_;"
)
crsr = cnxn.cursor()
crsr.execute("CREATE TABLE #tvp_data (Id int)")
tvp_data = [(123, ), (234, ), (345, )]
crsr.executemany(
"INSERT INTO #tvp_data (Id) VALUES (?)",
tvp_data
)
crsr.execute("""\
SET NOCOUNT ON;
DECLARE #tvp dbo.dboListInt;
INSERT INTO #tvp (Id)
SELECT Id FROM #tvp_data;
EXEC dbo.dboPyOdbcTestTvp #tvp;
""")
print(crsr.fetchall())
# [(123, ), (234, ), (345, )]