Python pyodbc-SQL 语法无效

Question

我正在使用 Jupyter Notebook。我正在使用 pyodbc 从 SQL Server 2018 获取数据，但是当我尝试执行此操作时，它给了我一个错误。如何解决？

import pyodbc
import datetime
conn = pyodbc.connect('Driver={SQL Server};'
                      'Server=DESKTOP-MBJNNJR;'
                      'Database=master;'
                      'Trusted_Connection=yes;')
cursor = conn.cursor()

cursor.execute("SELECT Employee_Name, Hire_Date FROM Employee WHERE Hire_Date BETWEEN [{%s}] AND [{%s}]");
hire_start = datetime.date(1999, 1, 1)
hire_end = datetime.date(1999, 12, 31)
cursor.execute(query, (hire_start, hire_end))
for (Employee_Name, Hire_Date) in cursor:    
    print("{}, {} was hired on {:%d %m %Y}".format(Employee_Name, Hire_Date))
cursor.close()

错误：

ProgrammingError: ('42S22', "[42S22] [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid column name '{%s}'. (207) (SQLExecDirectW); [42S22] [Microsoft][ODBC SQL Server Driver][SQL Server]Invalid column name '{%s}'. (207)")

Answer 1

这看起来像是一个印刷错误，以及参数标记的错误使用。

推测cursor.execute 的第一行实际上应该是query =...。对于实际的cursor.execute，您无需在进一步的括号中传递参数，PyODBC 中的参数标记是? 而不是%s（表示字符串）。

query = "SELECT Employee_Name, Hire_Date FROM Employee WHERE Hire_Date BETWEEN ? AND ?;"
hire_start = datetime.date(1999, 1, 1)
hire_end = datetime.date(1999, 12, 31)
cursor.execute(query, hire_start, hire_end)