python - 参数为 : [ODBC Microsoft Access Driver] Too few parameters. 的 PypyODBC 预期为 4

Question

我正在使用 pypyodbc 从访问数据库中选择数据。我正在使用具有三个已指定参数的以下查询。

我尝试了几个品种，但都无济于事。我没有发现我的语法有任何问题。

---

SELECT [Date], [Time], [uSec], [threeR], [twoCV] 
FROM [table_a] 
WHERE (Date = ? AND Time > ?) 
OR (Date > ?)

参数有以下几种类型:

[datetime.date, datetime.time, datetime. date]

打印时:

1900-09-16 ,  00:00:00, 1900-09-16

pypyodbc.DatabaseError: ('07002', '[07002] [Microsoft][ODBC Microsoft Access Driver] 参数太少。预期为 4。')

#-- Begin Python code sample
#-- Checks the DB file and retrieves data
def pullData(self):

    #-- Connect  to Access
    con = pypyodbc.connect('Driver={Microsoft Access Driver (*.mdb)};DBQ=F:/database.mdb')
    cur = con.cursor()

    #-- Get column list
    columnListODBC = '[thisDate], [thisTime]'
    for y in myTable.getColumns():
        columnListODBC = columnListODBC + ', [' + y + "]"

    #-- See footnote 1
    print(columnListODBC)

    #-- Get the most recent SQL entry
    for row in curSQL.execute('SELECT MAX(Datetime) FROM [' + _.getName() + ']'):
        xDateTime = datetime.datetime.strptime(row[0], "%Y-%d-%m %H:%M:%S")
        day = xDateTime.date() # Get only the DATE of the most recent entry
        time = xDateTime.time() # Get only the TIME of the most recent entry                

    #-- Pull all ODBC data
    queryString = 'SELECT ' + columnListODBC + ' FROM [' + _.getName() + '] WHERE (thisDate = ? AND thisTime > ?) OR (thisDate > ?)'

    #-- See footnote 2
    print(queryString, ", ", day, ", ", time)
    cur.execute(queryString, [day,time,day])

打印 1:[thisDate]、[thisTime]、[uSec]、[threeR]、[twoCV]

打印 2:SELECT [thisDate]、[thisTime]、[uSec]、[threeR]、[twoCV] FROM [table_a] WHERE (thisDate = ? AND thisTime > ?) OR (thisDate > ?) , 1900-09-16 , 00:00:00

---

编辑:虽然我在玩弄它，但当我删除其中一列时，它似乎成功执行了。尽管这两列都存在于源表中。这并没有回答为什么原始查询不执行的问题。

SELECT [Date], [Time], [uSec], [twoCV] 
FROM [table_a] 
WHERE (Date = ? AND Time > ?) 
OR (Date > ?)

编辑 2:更改日期和时间列的名称没有影响。以下仍然报错:

SELECT [thisDate], [thisTime], [uSec], [threeR], [twoCV] 
FROM [table_a] 
WHERE ([thisDate] = ? AND [thisTime] > ?) 
OR ([thisDate] > ?)

[Microsoft][ODBC Microsoft Access Driver] 参数太少。预计 5 个。

编辑 3:这是它从中提取的表的设计 View 。

Answer 1

太补充Bryan Eargle的回答了:我刚才遇到了这个。 原来是某个列名写错了。

当我故意使用两个错误的列名时出现以下错误:

Traceback (most recent call last):
  File "C:\...\some_code.py", line 74, in <module>
    table_headers, table_data = fetch_relations()
  File "C:\...\some_code.py", line 27, in fetch_relations
    cur.execute(sql);
  File "C:\Python34\lib\site-packages\pypyodbc.py", line 1605, in execute
    self.execdirect(query_string)
  File "C:\Python34\lib\site-packages\pypyodbc.py", line 1631, in execdirect
    check_success(self, ret)
  File "C:\Python34\lib\site-packages\pypyodbc.py", line 986, in check_success
    ctrl_err(SQL_HANDLE_STMT, ODBC_obj.stmt_h, ret, ODBC_obj.ansi)
  File "C:\Python34\lib\site-packages\pypyodbc.py", line 966, in ctrl_err
    raise DatabaseError(state,err_text)
pypyodbc.DatabaseError: ('07002', '[07002] [Microsoft][ODBC Microsoft Access Driver] Too few parameters. Expected 2.')

注意最后一行，Expected 2. 与有问题的列数对齐。对我来说，当列名正确时，问题就会消失。