如何解析此 JSON 以填充到 APEX 集合中并按日期排序

Question

我在 JSON 下面使用 Oracle 11gR2 数据库中的 APEX_JSON 进行解析。我的要求是按 closed_at 对日期进行排序并选择最新的 close_reason。我正在考虑将 closed_at 和 close_reason 填充到 APEX 集合中。将日期按 apex_collections 降序排序以选择最新的 close_reason.

你能帮忙写下 APEX_JSON.get_count 和 APEX_JSON.get_varchar2 来获取 closed_at 和 close_reason.

{"openings": [{
                "id": 5003,
                "opening_id": null,
                "status": "closed",
                "opened_at": "2020-11-30T20:09:56.487Z",
                "closed_at": "2020-12-02T22:43:45.736Z",
                "application_id": 76370003,
                "close_reason": null
            }, {
                "id": 8003,
                "opening_id": null,
                "status": "closed",
                "opened_at": "2020-11-30T20:59:02.267Z",
                "closed_at": "2020-12-04T11:07:26.087Z",
                "application_id": 45990003,
                "close_reason": {
                    "id": 7003,
                    "name": "Hire - New Headcount"
                }
            }
        ]
}

谢谢基肖尔

Answer 1

在使用APEX_JSON.GET_VARCHAR2()之前，需要在PL/SQL代码中解析APEX_JSON.PARSE()。而不是使用 PL/SQL，SQL 可能会通过使用 XMLTABLE 直接使用，例如

WITH t1 AS
(
SELECT APEX_JSON.TO_XMLTYPE(jsdata) AS xml_data
  FROM t0 -- suppose your json data is inserted into jsdata column of this table
), t2 AS
(
  SELECT close_reason,
         ROW_NUMBER() OVER 
        (ORDER BY TO_TIMESTAMP(closed_at, 'yyyy-mm-dd"T"hh24:mi:ss.ff"Z"') DESC) AS rn
    FROM t1
   CROSS JOIN
         XMLTABLE('/json/openings/row'
                  PASSING xml_data
                  COLUMNS 
                    closed_at    VARCHAR2(100) PATH 'closed_at',
                    close_reason VARCHAR2(900) PATH 'close_reason/name'
                 ) 
)
SELECT close_reason 
  FROM t2
 WHERE rn = 1

为了带上最新的关闭原因。

如果你真的需要使用问题中给出的那些功能，那么使用下面的代码块

DECLARE
   v_json VARCHAR2(32767); 
   v_ct   OWA.VC_ARR;
   v_cr   OWA.VC_ARR; 
   TYPE ts IS TABLE OF TIMESTAMP INDEX BY BINARY_INTEGER; 
   v_ts   ts;
   v_ts1  TIMESTAMP;
   idx    INT;
BEGIN
   SELECT *
     INTO v_json
     FROM t0;  -- there's no WHERE clause assuming only one row is to be inserted
   APEX_JSON.PARSE(v_json);

   FOR i IN 1..APEX_JSON.GET_COUNT('openings')
   LOOP
     v_ct(i) := APEX_JSON.GET_VARCHAR2('openings['||i||'].closed_at');
     v_ts(i) := TO_TIMESTAMP(v_ct(i), 'yyyy-mm-dd"T"hh24:mi:ss.ff"Z"');
     IF NVL(v_ts1, v_ts(i)) <= v_ts(i) THEN
       v_ts1 := v_ts(i);
       idx := i;
     END IF; 
     v_cr(i) := APEX_JSON.GET_VARCHAR2('openings['||i||'].close_reason.name');          
   END LOOP;    
   DBMS_OUTPUT.PUT_LINE(v_cr(idx));                     
END;
/

如何解析此 JSON 以填充到 APEX 集合中并按日期排序

How to parse this JSON to populate into APEX Collection and sort by date

oracle

json

plsql

oracle11g

oracle-apex