[英]python cx_Oracle Bind illegal variable name
Trouble with bindind date in dictionary in the following statements?? 在以下语句中字典中的bindind日期有问题吗?
mySQL = 'SELECT day_key FROM timeday WHERE calendar_date =:calendar'
args = {'calendar':'2016/10/16', 'giftcardnbr': '7777083049519090', 'giftcard_amt': '249.8'}
cursor.execute(mySQL,args)
DatabaseError: ORA-01036: illegal variable name/number DatabaseError:ORA-01036:非法的变量名称/编号
Why does this syntax return a different error? 为什么此语法返回不同的错误?
cursor.execute('SELECT day_key FROM timeday WHERE calendar_date =:calendar',{'calendar':'2016/10/16'})
DatabaseError: ORA-01861: literal does not match format string DatabaseError:ORA-01861:文字与格式字符串不匹配
From mastering Oracle Python 从掌握Oracle Python
named_params = {'dept_id':50, 'sal':1000}
query1 = cursor.execute('SELECT * FROM employees WHERE department_id=:dept_id AND salary>:sal', named_params)
works fine?? 工作正常??
Thanks 谢谢
Your first query doesn't work because cx_Oracle is trying to bind giftcardnbr
and giftcard_amt
to non-existent bind variables. 您的第一个查询不起作用,因为cx_Oracle试图将
giftcardnbr
和giftcard_amt
绑定到不存在的绑定变量。
If I bind the correct number of variables in a Cursor.execute()
call everything is fine: 如果我在
Cursor.execute()
绑定正确数量的变量,则一切正常:
>>> import cx_Oracle
>>> DB = cx_Oracle.connect('ben/****@s1/s1')
>>> cur = DB.cursor()
>>> SQL = "select * from dual where 1 = :a"
>>> cur.execute(SQL, {'a' : 1}).fetchall()
[('X',)]
If I try to bind a non-existent variable then it fails with the same error: 如果我尝试绑定不存在的变量,则它将失败,并显示相同的错误:
>>> cur.execute(SQL, {'a' : 1, 'b' : 2}).fetchall()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
cx_Oracle.DatabaseError: ORA-01036: illegal variable name/number
Your second call fails because '2016/10/16'
is not a date, it's a string (see my previous answer Comparing Dates in Oracle SQL ). 您的第二次呼叫失败,因为
'2016/10/16'
不是日期,而是一个字符串(请参阅我先前的答案“ Oracle SQL中的比较日期” )。
If we construct a date and then use that to compare to a date everything's fine: 如果我们构造一个日期,然后将其用于与日期进行比较,那么一切都很好:
>>> import datetime
>>> my_date = datetime.datetime(year=2016, month=10, day=16)
>>> my_date
datetime.datetime(2016, 10, 16, 0, 0)
>>> SQL = "select * from dual where date '2016-01-01' = :calendar"
>>> cur.execute(SQL, {'calendar' : my_date }).fetchall()
[]
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