Today the problem when using python3.7 in pymssql connect sqlserver encountered:
pymssql.OperationalError: (20009, b'DB-Lib error message 20009, severity 9:\nUnable to connect: Adaptive Server is unavailable or does not exist (SZS\\SQLEXPRESS)\n')
It has now been resolved, specifically to record.
1. When connecting python sql server used, made the following configurations:
sql server configuration manager ---> SQL Server Network Configuration ----> select instances that are currently used ------> open TCP / IP ----> find the current dynamic port number (currently 51091) ,As shown below:
2. The code is as follows:
import pymssql conn = pymssql.connect(host='localhost',server='SZS\SQLEXPRESS', port='51091', user='sa', password='123', database='mysql') cur = conn.cursor() sqlstr = "select * from book" cur.execute(sqlstr) data = cur.fetchall() cur.close() conn.close() print(data)
3.执行上方代码结果如下，没有报错
4.注意点
conn = pymssql.connect(host='localhost',server='SZS\SQLEXPRESS', port='51091', user='sa', password='123', database='mysql') # 或者
conn = pymssql.connect(host='szs',server='SZS\SQLEXPRESS', port='51091', user='sa', password='123', database='mysql')
1.在写上面的连接字符串的时候，需要host和server分开，host代表当前的主机名，如自己的pc名或者直接写localhost；
2.port为第一张图中的51091，如果不写，默认为1433，如果当前的数据库实例不是使用1433的端口，就会报错；
参考：https://blog.csdn.net/djx_6688/article/details/85159278