ODBC connection from Clickhouse to MSSQL databases - sql-server

Question

Please help with ODBC connection from Clickhouse to SQL Server databases.
I configured ODBC on the Clickhouse server.
Сonnection from clients such as isql, tsql is successful.
But it is not possible to connect from the clickhouse client's.
Operation system – Ubuntu 20.04
Clickhouse Server – version 22.1.3
Clickhouse Client – version 18.16.1
MS SQL Server 2016 on Windows Server.
/etc/freetds/freetds.conf
[TSQL_NE]
host = 10.72.82.72
port = 1433
tds version = 7.4
client charset = UTF-8
/etc/odbcinst.ini
[FreeTDS]
Description=FreeTDS
Driver=/usr/lib/x86_64-linux-gnu/odbc/libtdsodbc.so
Setup=/usr/lib/x86_64-linux-gnu/odbc/libtdsS.so
FileUsage=1
UsageCount=8
/etc/odbc.ini
[TSQL_NE]
Description=FreeTDS NE
Driver=FreeTDS
Server=10.72.82.72
Database=ASU
UID=user
PWD=password
Port=1433
Checking the connection to the MSSQL database via ODBC
root#srv:/# isql -v TSQL_NE "user" "password"
+---------------------------------------+
| Connected! |
| |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+
SQL> SELECT top 10 v1 from asu.dbo.data
+-------------------------+
| V1 |
+-------------------------+
| 1.45 |
| 1.5062500000000001 |
| 1.385 |
| 1.4237500000000001 |
| 1.3712500000000001 |
| 1.425 |
| 1.39625 |
| 1.6487499999999999 |
| 1.28 |
| 1.2037500000000001 |
+-------------------------+
SQLRowCount returns 10
10 rows fetched
root#srv:/# tsql -v -S TSQL_NE -U user –P password
locale is "C.UTF-8"
locale charset is "UTF-8"
using default charset "UTF-8"
1> SELECT top 10 v1 from asu.dbo.data
…
10 rows fetched
Connection with clickhouse-client and the error
root#srv:~# clickhouse-client
ClickHouse client version 18.16.1.
Password for user :
Connecting to localhost:9000.
Connected to ClickHouse server version 22.2.2 revision 54455.
b7e1d742cbd0 :) SELECT top 10 v1 from odbc('DSN=TSQL_NE;Uid=user;Pwd=password;', 'asu', 'dbo.data')
0 rows in set. Elapsed: 0.290 sec.
Received exception from server (version 22.2.2):
> Code: 86. DB::Exception: Received from localhost:9000, 127.0.0.1.
DB::Exception: Received error from remote server /columns_info?connection_string=DSN%3DTSQL_NE%3B%20Uid%3Duser%3BPwd%3Dpassword%3B&table=dbo.data&external_table_functions_use_nulls=true.
HTTP status code: 500 Internal Server Error, body: Error getting columns from ODBC
'Code: 36. DB::Exception: Table dbo.data not found. (BAD_ARGUMENTS) (version 22.2.2.1)'

Answer 1

You command in clickhouse-client should be
SELECT top 10 v1 from odbc('DSN=TSQL_NE;Uid=user;Pwd=password;Database=asu', 'dbo', 'data')

Answer 2

SELECT top 10 v1 from odbc('DSN=TSQL_NE;Uid=user;Pwd=password;', '', 'data')
When you remove schema and database you will get success. I saw this method in here