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[英]ibm_db connect DB2 using SSLClientKeystoredb in Python
[英]Update the timestamp to current timestamp in DB2 using Python ibm_db package
每次我的腳本部分運行時,我都試圖將 db2 中的 lastupdated 時間戳設置為當前時間戳
datetimes = datetime.now()
datetime1 = datetimes.strftime("%Y-%m-%d %H:%M:%S")
datetime2 = datetime.strptime(datetime1,'%Y-%m-%d %H:%M:%S')
print(type(datetime2))
print(datetime2)
sql = "update salesorder set LASTUPDATEUSER = 'Testing' and LASTUPDATEDATETIME = ? where code ='0888' "
prepared = ibm_db.prepare(conn, sql)
returnCode = ibm_db.bind_param(prepared,1,datetime2, ibm_db.SQL_PARAM_INPUT,ibm_db.SQL_CHAR)
if returnCode == False:
print("unable to bind")
#ibm_db.execute(upstmt)
#param = param1
returnCode = ibm_db.execute(prepared)
if returnCode == False:
print("unable to execut")
在運行此腳本時出現錯誤
Traceback (most recent call last):
File "new.py", line 27, in <module>
returnCode = ibm_db.execute(prepared)
SQLCODE=-420atement Execute Failed: [IBM][CLI Driver][DB2/LINUXX8664] SQL0420N Invalid character found in a character string argument of the function "BOOLEAN". SQLSTATE=22018
我嘗試了多種解決方案,例如將日期時間作為字符串傳遞,但沒有解決問題,這是 db2 '2020-02-21 13:37:37' 中使用的時間戳格式
如果有人可以請提供一種解決此問題的方法,這將非常有幫助
您的更新 stmt 錯誤。 改變:
update salesorder
set LASTUPDATEUSER = 'Testing' and LASTUPDATEDATETIME = ?
where code ='0888'
至:
update salesorder
set LASTUPDATEUSER = 'Testing'
, LASTUPDATEDATETIME = ?
where code ='0888'
或者:
update salesorder
set (LASTUPDATEUSER, LASTUPDATEDATETIME) = ('Testing', ?)
where code ='0888'
您收到的錯誤消息令人費解,但這是因為您嘗試從字符串中評估 Boolean:
db2 "values 'testing' and current_timestamp = current_timestamp"
1
--
SQL0420N Invalid character found in a character string argument of the
function "BOOLEAN". SQLSTATE=22018
與之比較
db2 "values true and current_timestamp = current_timestamp"
1
--
1
即使成功,您在嘗試為時間戳列分配 boolean 值時也會出錯。
我猜舊版本的 Db2 在准備期間會反對,但現在類型檢查要輕松得多,這會不時導致非常反直覺的錯誤消息
也就是說,您可能想考慮這樣做:
update salesorder
set (LASTUPDATEUSER, LASTUPDATEDATETIME) = ('Testing', current_timestamp)
where code ='0888'
然后,您的代碼將簡化為:
sql = """update salesorder
set (LASTUPDATEUSER, LASTUPDATEDATETIME) = ('Testing', current_timestamp)
where code ='0888'"""
prepared = ibm_db.prepare(conn, sql)
returnCode = ibm_db.execute(prepared)
if returnCode == False:
print("unable to execut")
作為一個側節點,我發現顯式綁定參數有點麻煩,通常只是這樣做:
ibm_db.execute(prepared, (param1, ...))
如果目的只是在行更改時更新時間戳,請考慮觸發器:
create trigger trg1
no cascade before update on salesorder
referencing new as n
for each row
set n.LASTUPDATEDATETIME = current_timestamp
如果您將更新語句更改為:
update salesorder
set LASTUPDATEUSER = 'Testing'
where code ='0888'
觸發器將為您執行此操作:
db2 "select * from salesorder"
LASTUPDATEUSER LASTUPDATEDATETIME CODE
-------------------- -------------------------- -----
Testing 2020-04-11-11.51.22.055602 0888
1 record(s) selected.
./aa.py
db2 "select * from salesorder"
LASTUPDATEUSER LASTUPDATEDATETIME CODE
-------------------- -------------------------- -----
Testing 2020-04-11-11.58.50.222753 0888
1 record(s) selected.
根據您的 Db2 版本,您還可以考慮將列聲明為:
FOR EACH ROW ON UPDATE AS ROW CHANGE TIMESTAMP
您可能希望始終生成,但我認為您不能將列更改為該列,因此您必須做更多的工作才能將其落實到位。
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