本地 MSSQL 服务器与 pymssql 的数据库连接失败

Question

I had been working with pyodbc for database connection in windows envirnment and it is working fine but now I want to switch to pymssql so that it is easier to be deployed to Linux machine as well. But I am getting this error:

(20009, b'DB-Lib error message 20009, severity 9:\\nUnable to connect: Adaptive Server is unavailable or does not exist (localhost:1433)\\nNet-Lib error during Unknown error (10060)\\n')

My connection code for using both pyodbc and pymssql is:

import pyodbc
    import pymssql

    def connectODSDB_1():
        conn_str = (
            r"Driver={SQL Server};"
            r"Server=(local);"
            r"Database=populatedSandbox;"
            r"Trusted_Connection=yes;"
        )
        return pyodbc.connect(conn_str)

    def connectODSDB_2():
        server = '(local)'
        database = 'populatedSandbox'
        conn = pymssql.connect(server=server, database=database)
        return conn

What could be the problem? And solution?

Answer 1

Well after browsing internet for a while, it seems pymssql needs TCP/IP be enabled for communication.

1. Open Sql Server Configuration Manager
2. Expand SQL Server Network Configuration
3. Click on Protocols for instance_name
4. Enable TCP/IP

Answer 2

I have faced the same issue while using RDS(AWS database instance). We should configured the inbound outbound rules. Do following steps to configure.

Services->RDS->DB Instances -> Select DB-> Connectivity&Security

Under Security Section

VPC security groups -> click on security group    

Change the inbound rules.

Check the source IP and change into anywhere or specific IP