如何将 python 数组传递给 oracle 存储过程？

Question

我有问题。当我传递 Python 数组时：

self.notPermited = [2,3]

这是我的程序

def select_ids_entre_amistades(self,cod_us,ids_not):
    lista = []
    try:
        cursor = self.__cursor.var(cx_Oracle.CURSOR)
        print ids_not
        data = self.__cursor.arrayvar(cx_Oracle.NUMBER, ids_not)
        print data
        l_query = self.__cursor.callproc("SCHEMA.PROC_SELECT_IDS_ENT_AMISTADES", [cursor,cod_us,data])
        lista = l_query[0]
        return lista
    except cx_Oracle.DatabaseError as ex:
        error, = ex.args
        print(error.message)
        return lista

问题是当我使用这个调用该过程时：

self.select_ids_entre_amistades(int_id,self.notPermited)

我在控制台中看到以下消息：

PLS-00306: wrong number or types of arguments in call to 'PROC

在数据库中，我创建了这样的数组对象：

CREATE TYPE SCHEMA.ARRAY_ID_FRIENDS AS TABLE OF INT;

Oracle存储过程是这样开始的：

CREATE OR REPLACE PROCEDURE FACEBOOK.PROC_SELECT_IDS_ENT_AMISTADES
(CONSULTA OUT SYS_REFCURSOR,COD_US IN INT, IDS_FRIEND IN SCHEMA.ARRAY_ID_FRIENDS)

我不知道是什么问题，我相信 cx_Oracle.NUMBER 不是整数，但也没有其他数字类型。提前致谢。

Answer 1

当您查看 cx_Oracle 文档时，它说您可以像这样创建数组；

 Cursor.arrayvar(dataType, value[, size])
Create an array variable associated with the cursor of the given type and size and return a variable object (Variable Objects). The value is either an integer specifying the number of elements to allocate or it is a list and the number of elements allocated is drawn from the size of the list. If the value is a list, the variable is also set with the contents of the list. If the size is not specified and the type is a string or binary, 4000 bytes (maximum allowable by Oracle) is allocated. This is needed for passing arrays to PL/SQL (in cases where the list might be empty and the type cannot be determined automatically) or returning arrays from PL/SQL.

只要数组类型与 PL/SQL 过程的参数兼容，您就可以传递数组。这是一个创建数组的简单示例。

>>> myarray=cursor.arrayvar(cx_Oracle.NUMBER,range(0,10))
>>> myarray
<cx_Oracle.NUMBER with value [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]>

这里有一个 link（属于 2005 似乎过时了，不确定）展示了如何在 PL/SQL 端创建数组。

编辑：

我在下面添加了一个完整示例，展示了如何传递 arrayvar 和其他变量类型。我用 Oracle 10g 和 Python 2.7 测试了代码。希望对您有所帮助。

from __future__ import print_function
import cx_Oracle as cxo

conn = cxo.connect("<YOUR TNS STRING>")

cursor = conn.cursor()
ref_cursor = cursor.var(cxo.CURSOR)
cod_us = cursor.var(cxo.NUMBER, 10)
ids_friend = cursor.arrayvar(cxo.NUMBER, range(0, 10))
ids_friend_sum = cursor.var(cxo.NUMBER)
cursor.execute('''
DECLARE

TYPE REF_CURSOR IS REF CURSOR;
TYPE ARRAY_ID_FRIENDS IS TABLE OF INT INDEX BY BINARY_INTEGER;

    FUNCTION test(CONSULTA OUT REF_CURSOR,
                   COD_US IN INT,
                   IDS_FRIEND IN ARRAY_ID_FRIENDS) RETURN NUMBER
    IS
        sum_ NUMBER:=0;
    BEGIN
        OPEN CONSULTA FOR SELECT 1 FROM DUAL UNION SELECT 2 FROM DUAL;

        FOR i in IDS_FRIEND.FIRST..IDS_FRIEND.LAST LOOP
            sum_:=sum_+IDS_FRIEND(i);
        END LOOP;
        RETURN sum_;
    END;

BEGIN
    :ids_friend_sum:=test(:ref_cursor,:cod_us,:ids_friend);
END;


''', {"ref_cursor": ref_cursor, "cod_us": cod_us, "ids_friend": ids_friend,
      "ids_friend_sum": ids_friend_sum})

print("ref cursor=", end=" ")
for rec in ref_cursor.getvalue():
    print(rec, end="\t")
print("\nids_friend_sum=", ids_friend_sum.getvalue())

Answer 2

尝试在过程的参数中使用 plsql 数组，然后传递 sql 数组的内容。最后一个将用于将 sql 语句放入程序中。它解决了我使用 oracle 数据库 11g 的问题，因为在 12g 中您不需要将内容传递给 sql 数组。这可能是代码：

def select_ids_entre_amistades(self,cod_us,ids_not):
    lista = []
    try:
        cursor = self.__cursor.var(cx_Oracle.CURSOR)
        varray = self.__cursor.arrayvar(cx_Oracle.NUMBER,ids_not)
        l_query = self.__cursor.callproc("PACKFACE.P_SELECT_IDBFRIENDS", [cursor, cod_us, varray])
        lista = l_query[0]
        return lista
    except cx_Oracle.DatabaseError as ex:
        error, = ex.args
        self.guardar_errores('dato ' + str(error.message))
        return lista

存储过程如下：首先你创建一个类型

CREATE OR REPLACE TYPE LIST_IDS AS TABLE OF INT;

然后你创建你的包

CREATE OR REPLACE PACKAGE PACKFACE IS
TYPE LISTADO_IDS IS TABLE OF INT INDEX BY PLS_INTEGER;
PROCEDURE P_SELECT_IDBFRIENDS (CONSULTA OUT SYS_REFCURSOR,COD_US IN INT,IDS_NOT IN LISTADO_IDS);
END;

最后创建包体

CREATE OR REPLACE PACKAGE BODY PACKFACE IS
    PROCEDURE P_SELECT_IDBFRIENDS (CONSULTA OUT SYS_REFCURSOR,COD_US IN INT, IDS_NOT IN LISTADO_IDS) 
    IS
        num_array LIST_IDS;
    BEGIN
        num_array:=LIST_IDS();
        for i in 1 .. IDS_NOT.count
        loop
            num_array.extend(1);
            num_array(i) := IDS_NOT(i);
        end loop; 
        OPEN CONSULTA FOR 
        SELECT * FROM T_TABLE WHERE ID IN (SELECT COLUMN_VALUE FROM TABLE(num_array));
    END;
END;

希望对你有所帮助

如何将 python 数组传递给 oracle 存储过程？

How to pass a python array to an oracle stored procedure?

stored-procedures

cx-oracle

python-2.7

编辑：