How to solve for pyodbc.ProgrammingError: The second parameter to executemany must not be empty

Question

您好，我在将数据从一个数据库传输到另一个数据库时遇到问题。我在 msql db 上使用 table 中的字段创建了一个列表，使用该列表查询和 oracle db table （使用 where 语句中的初始列表来过滤结果）然后我将查询结果加载回 msql db.

程序在前几次迭代中运行，但随后出错，出现以下错误 ( 追溯（最近一次通话）：文件“C:/Users/1/PycharmProjects/DataExtracts/BuyerGroup.py”，第 67 行，位于 insertIntoMSDatabase（idString） insertIntoMSDatabase 中的文件“C:/Users/1/PycharmProjects/DataExtracts/BuyerGroup.py”，第 48 行 mycursor.executemany(sql, 值) pyodbc.ProgrammingError：executemany的第二个参数不能为空。）

我似乎无法在网上找到解决此错误消息的指导。我觉得这可能是一个简单的解决方案，但我就是做不到...

# import libraries
import cx_Oracle
import pyodbc
import logging
import time
import re
import math
import numpy as np

logging.basicConfig(level=logging.DEBUG)

conn = pyodbc.connect('''Driver={SQL Server Native Client 11.0};
                         Server='servername';
                         Database='dbname';
                         Trusted_connection=yes;''')
b = conn.cursor()
dsn_tns = cx_Oracle.makedsn('Hostname', 'port', service_name='name')
conn1 = cx_Oracle.connect(user=r'uid', password='pwd', dsn=dsn_tns)
c = conn1.cursor()

beginTime = time.time()

bind = (b.execute('''select distinct field1
                     from [server].[db].[dbo].[table]'''))
print('MSQL table(s) queried, List Generated')

# formats ids for sql string
def surroundWithQuotes(id):
    return "'" + re.sub(",|\s$", "", str(id)) + "'"

def insertIntoMSDatabase(idString):
    osql = '''SELECT distinct field1, field2
                FROM Database.Table
                WHERE field2 is not null and field3 IN ({})'''.format(idString)
    c.execute(osql)
    claimsdata = c.fetchall()
    print('Oracle table(s) queried, Data Pulled')

    mycursor = conn.cursor()
    sql = '''INSERT INTO [dbo].[tablename] 
                (
                 [fields1]
                ,[field2]
                )
            VALUES (?,?)'''

    val = claimsdata
    mycursor.executemany(sql, val)
    conn.commit()

ids = []
formattedIdStrings = []

# adds all the ids found in bind to an iterable array
for row in bind:
    ids.append(row[0])

# splits the ids[] array into multiple arrays < 1000 in length
batchedIds = np.array_split(ids, math.ceil(len(ids) / 1000))

# formats the value inside each batchedId to be a string
for batchedId in batchedIds:
    formattedIdStrings.append(",".join(map(surroundWithQuotes, batchedId)))

# runs insert into MS database for each batch of IDs
for idString in formattedIdStrings:
    insertIntoMSDatabase(idString)

print("MSQL table loaded, Data inserted into destination")

endTime = time.time()

print("Program Time Elapsed: ",endTime-beginTime)

conn.close()
conn1.close()

Answer 1

mycursor.executemany(sql, val)

pyodbc.ProgrammingError: The second parameter to executemany must not be empty.

在调用 .executemany() 之前，您需要验证 val 不是一个空列表（如果在 SELECT 语句上调用 .fetchall() 就会出现这种情况returns 没有行），例如，

if val:
    mycursor.executemany(sql, val)

How to solve for pyodbc.ProgrammingError: The second parameter to executemany must not be empty

How to solve for pyodbc.ProgrammingError: The second parameter to executemany must not be empty

oracle

pyodbc

python-3.7