我有一个高度嵌套的OBJECT TYPE结构,允许我以树状方式保存数据。
我现在想创建一个表来缓存这些对象,但是我很难创建表。我怀疑我的问题是多个嵌套级别,但不确定如何修复。
CREATE TYPE STEP_OBJ AS OBJECT (
ID VARCHAR2(20),
OTHER_FIELDS VARCHAR2(100));
/
CREATE TYPE STEP_TAB_OBJ AS TABLE OF STEP_OBJ;
/
CREATE TYPE TREE_OBJ AS OBJECT (
STEPS STEP_TAB_OBJ,
COMPLETE VARCHAR2(1));
/
CREATE TYPE TABLE_OF_TREE_OBJ AS TABLE OF TREE_OBJ;
/
CREATE TABLE TREE_TABLE_CACHE (
HANDLE VARCHAR2(20),
TABLE_OF_TREES TABLE_OF_TREE_OBJ)
NESTED TABLE TABLE_OF_TREES STORE AS TREE_TABLE_CACHE_OBJS;
/
CREATE TABLE TREE_TABLE_CACHE (
*
ERROR at line 1:
ORA-02320: failure in creating storage table for nested table column TABLE_OF_TREES
ORA-22913: must specify table name for nested table column or attribute
Oracle 11g。
答案 0 :(得分:6)
您需要为内部集合指定存储子句。语法只是将嵌套集合的子句包装在括号中,如下所示:
SQL> CREATE TABLE TREE_TABLE_CACHE (
2 HANDLE VARCHAR2(20),
3 TABLE_OF_TREES TABLE_OF_TREE_OBJ)
4 NESTED TABLE TABLE_OF_TREES STORE AS TREE_TABLE_CACHE_OBJS
5 ( NESTED TABLE STEPS STORE AS TREE_TABLE_CACHE_STEPS)
8 /
Table created.
SQL>