"Cannot find data type READONLY" 更新到 SQL 服务器时出错

Question

这个问题困扰我好久了，希望高人指教。我有一个要更新的 sql 数据库。下面是一些代码。我从 sql 提取数据到 Python，然后应用函数 hex_to_string & 切片 bin，我计划更新 SQL 数据库。我在数据库中没有任何 ID，但我有 DATETIME 来区分条目。

query = """ select P from Table """

cnxn = pyodbc.connect(conn_str)
cnxn.add_output_converter(pyodbc.SQL_VARBINARY, hexToString)
cursor: object = cnxn.cursor()

cursor.execute(query)
dtbs= cursor.fetchall()
row_list=[]
ln = len(dtbs)

 cursor.execute(query)

for i in range(ln):
    row=cursor.fetchval()
    result=slicing_bin(row)
    result_float = [float("{0:.2f}".format(i)) for i in result]
    row_list.append(result_float)

crsr = cnxn.cursor()
crsr.execute(query)
aList = [item[0] for item in crsr.fetchall()]
for aValue in aList:
    crsr.execute("""UPDATE Table SET P=? WHERE DATETIME=?""", (row_list, aValue))
crsr.close()
cnxn.commit()

当我运行这段代码时，我得到了一条错误信息，

File "C:/Users/r/.PyCharmCE2018.3/config/scratches/Finalcombined2.py", line 64, in crsr.execute("""UPDATE Access.dbo.M_PWA SET P_PULSES=? WHERE DATETIME=?""", (row_list, aValue)) pyodbc.ProgrammingError: ('42000', "[42000] [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Column, parameter, or variable #1: Cannot find data type READONLY. (2715) (SQLExecDirectW); [42000] [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Statement(s) could not be prepared. (8180); [42000] [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Parameter or variable '@P1' has an invalid data type. (2724)")

请帮忙，谢谢。

Answer 1

嗯，我猜戈德是对的。这当然是我首先要看的东西。好的，这是我如何在 MS Access 中进行更新的一个小示例，来自 Python。

#import pypyodbc
import pyodbc

# MS ACCESS DB CONNECTION
pyodbc.lowercase = False
conn = pyodbc.connect(
    r"Driver={Microsoft Access Driver (*.mdb, *.accdb)};" +
    r"Dbq=C:\path_here\Northwind.mdb;")

# OPEN CURSOR AND EXECUTE SQL
cur = conn.cursor()

# Option 1 - no error and no update
cur.execute("UPDATE dbo_test SET Location = 'New York' Where Status = 'Scheduled'");
conn.commit()


cur.close()
conn.close()

你能根据你的具体情况进行调整吗？

"Cannot find data type READONLY" 更新到 SQL 服务器时出错

"Cannot find data type READONLY" error on UPDATE to SQL Server

python

sql-server

pyodbc

python-3.x

sql-update