cx_Oracle - 未实现Oracle类型2010和本机类型3000之间的转换

Question

我试图使用cx_Oracle从用户定义类型（UDT）中提取数据。我可以毫无问题地为某些UDT提取数据但是对于一个特定的UDT，我无法提取数据。 Oracle中类型的结构：

CREATE OR REPLACE TYPE graphic_component AS OBJECT (
   type             NUMBER(6),
   source_type      NUMBER(4),
   meta_type_id     VARCHAR2(50 CHAR),
   name             VARCHAR2(100 CHAR),
   extension_info   VARCHAR2(500 CHAR),
   symbology_tokens VARCHAR2(2000 CHAR)
);

CREATE OR REPLACE TYPE graphic_component_array AS
      VARRAY (10000) OF graphic_component;

在Python中使用此代码提取UDT（code from here）：

def ObjectRepr(obj):
    if obj.type.iscollection:
        returnValue = []
        for value in obj.aslist():
            if isinstance(value, cx_Oracle.Object):
                value = ObjectRepr(value)
            returnValue.append(value)
    else:
        returnValue = {}
        for attr in obj.type.attributes:
            value = getattr(obj, attr.name)
            if value is None:
                continue
            elif isinstance(value, cx_Oracle.Object):
                value = ObjectRepr(value)
            returnValue[attr.name] = value
    return returnValue

然后，如果我尝试从UDT中提取数据，我收到此错误：

<cx_Oracle.Object GRAPHIC_COMPONENT_ARRAY at 0x26c9f10>
Traceback (most recent call last):
  File "C:/Users/petr.silhak/PycharmProjects/migration-to-postgresql/test_parsing.py", line 34, in <module>
    print(ObjectRepr(complex[0][0]))
  File "C:/Users/petr.silhak/PycharmProjects/migration-to-postgresql/test_parsing.py", line 9, in ObjectRepr
    value = ObjectRepr(value)
  File "C:/Users/petr.silhak/PycharmProjects/migration-to-postgresql/test_parsing.py", line 14, in ObjectRepr
    value = getattr(obj, attr.name)
cx_Oracle.DatabaseError: DPI-1014: conversion between Oracle type 2010 and native type 3000 is not implemented

看起来像Oracle odpi转换数据类型的问题。在这个具体的例子中，数据看起来像这样（来自SQL开发人员）：

GRAPHIC_COMPONENT(1007,17,'gtda_5012101_1',NULL,NULL,NULL,NULL)

Answer 1

检查您的cx_Oracle版本。 It looks like表示，2017年9月增加了从DPI_ORACLE_TYPE_NUMBER(2010)到DPI_NATIVE_TYPE_INT64(3000)的转换支持。