从mssqlserver2008读取单个值的Python脚本

Question

我只需要从mssqlserver2008连接中读取一个值，但我不确定如何执行此操作。这是密码

import pyodbc



querystring = """SELECT USER_NAME
FROM sem6.sem_computer, [sem6].[V_SEM_COMPUTER], sem6.IDENTITY_MAP, sem6.SEM_CLIENT
WHERE [sem6].[V_SEM_COMPUTER].COMPUTER_ID = SEM_COMPUTER.COMPUTER_ID
AND sem6.SEM_CLIENT.GROUP_ID = IDENTITY_MAP.ID
AND sem6.SEM_CLIENT.COMPUTER_ID = SEM_COMPUTER.COMPUTER_ID
AND [IP_ADDR1_TEXT] = '10.10.10.10'
"""

con = pyodbc.connect('DRIVER={SQL Server};SERVER=10.10.10.100;DATABASE=databasename;UID=username;PWD=password')
cur = con.cursor()
cur.execute(querystring)
con.commit()
con.close()

Answer 1

根据python的DB-API，您需要执行fetchone来检索第一行：

import pyodbc



querystring = """SELECT USER_NAME
FROM sem6.sem_computer, [sem6].[V_SEM_COMPUTER], sem6.IDENTITY_MAP, sem6.SEM_CLIENT
WHERE [sem6].[V_SEM_COMPUTER].COMPUTER_ID = SEM_COMPUTER.COMPUTER_ID
AND sem6.SEM_CLIENT.GROUP_ID = IDENTITY_MAP.ID
AND sem6.SEM_CLIENT.COMPUTER_ID = SEM_COMPUTER.COMPUTER_ID
AND [IP_ADDR1_TEXT] = '10.10.10.10'
"""

con = pyodbc.connect('DRIVER={SQL Server};SERVER=10.10.10.100;DATABASE=databasename;UID=username;PWD=password')
cur = con.cursor()
cur.execute(querystring)
row = cur.fetchone()
print(row[0])
con.close()

Answer 2

您需要在执行查询后获取结果。请参见PEP 249以了解dbapi如何公开这一点。在

在您的例子中，username = cur.fetchone()[0]将起作用。在