ORACLE - JSON To Key Value Pair Table

Question

Is there any way to obtain a table with key/value pairs from a CLOB Json Column?

The idea here is to get these values, on a dynamic way. Because the CLOB column does

Answer 1

12.2 contains a set of PL/SQL objects that can be used to build a DOM like structure of a JSON document. You can then extract key lists etc using methods on the objects. Look in the 12.2 doc for JSON_OBJECT_T, JSON_ARRAY_T etc which can be used like this..

SQL> create or replace type NV_PAIR_T as object (
  2    NAME  VARCHAR2(32),
  3    VALUE VARCHAR2(32)
  4  )
  5  /

Type created.

SQL> create or replace type NV_PAIR_TABLE as TABLE of NV_PAIR_T
  2  /

Type created.

SQL> create or replace function GET_KEY_VALUES(P_JSON_DOC VARCHAR2)
  2  return NV_PAIR_TABLE PIPELINED
  3  as
  4    JO JSON_OBJECT_T := JSON_OBJECT_T(P_JSON_DOC);
  5    JO_KEYS JSON_KEY_LIST := JO.get_keys();
  6  begin
  7
  8    for i in 1..JO_KEYS.count loop
  9      pipe row (NV_PAIR_T(JO_KEYS(i),JO.get_string(JO_KEYS(i))));
 10    end loop;
 11  end;
 12  /

Function created.

SQL> select *
  2   from TABLE(GET_KEY_VALUES('{"A":"AA", "B":"BB", "C":"CC"}'))
  3  /
A                                AA
B                                BB
C                                CC

SQL>

Does this help