在cx_oracle中返回存储过程输出游标变量

时间:2017-10-02 10:29:23

标签: python database oracle stored-procedures cx-oracle

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

1 个答案:

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]

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_queryl_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