我试图使用cx_oracle从python中的过程返回一个refcursor,我的过程看起来像下面的那个。程序下面是我试图使用的python。当我运行脚本时,返回的所有内容都是
DB: 0.00400018692017 seconds
Total: 0.00400018692017 seconds
<__builtin__.OracleCursor on <cx_Oracle.Connection to connection_string>>
我如何遍历refcursor? oracle documentation
PROCEDURE prc_get_some_data(
p_cursor OUT SYS_REFCURSOR)
IS
BEGIN
DBMS_APPLICATION_INFO.SET_CLIENT_INFO ('Python Script');
OPEN p_cursor FOR
SELECT *
FROM table;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_ERROR_STACK);
DBMS_OUTPUT.PUT_LINE(CHR(10));
DBMS_OUTPUT.PUT_LINE(DBMS_UTILITY.FORMAT_ERROR_BACKTRACE);
END prc_get_somedatas;
python脚本
import sys, time
from datetime import date, timedelta
import random
import cx_Oracle
import string
# Python Script to call a PL/SQL stored procedure to bulk load data
class Test:
def __init__(self):
self.__db = cx_Oracle.connect('connection_string')
self.__cursor = self.__db.cursor()
def __exit__(self, type, value, traceback):
self.__cursor.close()
self.__db.close()
def get_some_data(self):
d=date.today() # Initialize a date variable with date of today
db_start = time.time()
start_all = time.time()
self.__cursor.bindarraysize = 2500
self.__cursor.arraysize = 10000
# create a cursor variable to return the results into
l_cur = self.__cursor.var(cx_Oracle.CURSOR)
#execute the procedure
l_test = self.__cursor.callproc("prc_get_some_data",[l_cur])
db_elapsed = (time.time() - db_start)
total_elapsed = (time.time() - start_all)
print "DB:\t ", db_elapsed, " seconds"
print "Total:\t ", total_elapsed, " seconds"
return list(l_test)
if __name__ == "__main__":
test = Test()
print test.get_some_data()
数据库oracle 12c 客户:12.1.0.2
答案 0 :(得分:2)
对过程的调用将序列作为参数,并返回序列。
l_test = self.__cursor.callproc("prc_get_some_data",[l_cur])
print(type(l_test))
#>>> <class 'list'>
因此,您可以通过索引访问返回的游标:
ret_cursor = self.__cursor.callproc("prc_get_some_data",[l_cur])[0]
或
l_test = self.__cursor.callproc("prc_get_some_data",[l_cur])
ret_cursor = l_test[0]
然后你可以用for循环打印结果
for line in ret_cursor:
print line
或使用print ret_cursor.fetchall()
,或使用pprint
工具(如果需要)。
在您关联的documentation中,返回值会直接解包为l_query
和l_emp
:
l_query, l_emp = self.__cursor.callproc("PKG_HR.FIND_EMPLOYEES", [p_query, l_cur])
顺便说一句,您可能需要使用与主光标相同的方法关闭最后返回的光标:ret_cursor.close()
。否则,它可以抛出关于连接无法关闭的例外。