Python MySQLdb TypeError（“字符串格式化期间并非所有参数都转换”）

Question

我知道这是一个热门话题，但我搜索了各种答案，但没有看到我的问题的明确答案。我有一个函数，我想用它来将记录插入到我的 NDBC 数据库中，这给了我标题中提到的错误。函数如下：

def insertStdMet(station,cursor,data):
# This function takes in a station id, database cursor and an array of data.  At present
# it assumes the data is a pandas dataframe with the datetime value as the index
# It may eventually be modified to be more flexible.  With the parameters
# passed in, it goes row by row and builds an INSERT INTO SQL statement
# that assumes each row in the data array represents a new record to be
# added.
fields=list(data.columns) # if our table has been constructed properly, these column names should map to the fields in the data table
# Building the SQL string
strSQL1='REPLACE INTO std_met (station_id,date_time,'
strSQL2='VALUES ('
for f in fields:
    strSQL1+=f+','
    strSQL2+='%s,'
# trimming the last comma
strSQL1=strSQL1[:-1]
strSQL2=strSQL2[:-1]
strSQL1+=") " + strSQL2 + ")"
# Okay, now we have our SQL string.  Now we need to build the list of tuples
# that will be passed along with it to the .executemany() function.
tuplist=[]
for i in range(len(data)):
    r=data.iloc[i][:]
    datatup=(station,r.name)
    for f in r:
        datatup+=(f,)
    tuplist.append(datatup)
cursor.executemany(strSQL1,tuplist)

当我们调用 cursor.executemany() 时，strSQL 看起来像这样：

REPLACE INTO std_met (station_id,date_time,WDIR,WSPD,GST,WVHT,DPD,APD,MWD,PRES,ATMP,WTMP,DEWP,VIS) VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)'

我一直在使用 % 符号，并且正在传递一个元组列表（~2315 个元组）。传递的每个值都是字符串、日期时间或数字。我仍然没有发现问题。我们真诚地感谢任何人愿意传递的任何见解。

谢谢！

Answer 1

您尚未为 SQL 查询指定 station_id 或 date_time 的值，因此当它解压您的参数时，缺少两个。

我怀疑您希望最终调用类似于：

REPLACE INTO std_met 
(station_id,date_time,WDIR,WSPD,GST,WVHT,DPD,APD,MWD,
 PRES,ATMP,WTMP,DEWP,VIS) VALUES (%s, %s, %s,%s,%s,%s,
                                  %s,%s,%s,%s,%s,%s,%s,%s)'

注意额外的两个%s。看起来你的元组已经包含了 station_id 和 date_time 的值，所以你可以试试这个改变：

strSQL1='REPLACE INTO std_met (station_id,date_time,'
strSQL2='VALUES (%s, %s, '