PL/SQL APEX_JSON how to parse to CLOB variable - plsql

Question

I'm trying to parse a json object like this one:
{
"sites": [
{
"code": "code",
"siteName": "site name",
"country": "country",
"arrayToClob": [
{
"field1": "field 1",
"field2": "field 2"
}
]
}
]
}
and I want to store the value of "arrayToClob" element into a Clob column of my DB and for that I'm trying to get the value of that element as a whole. This is what I tried:
APEX_JSON.parse(MY_JSON);
l_count := APEX_JSON.get_count('sites');
FOR i IN 1 .. l_count LOOP
l_code := APEX_JSON.get_varchar2('sites[%d].code', i);
l_siteName := APEX_JSON.get_varchar2('sites[%d].siteName', i);
l_country := APEX_JSON.get_varchar2('sites[%d].country', i);
l_value := APEX_JSON.get_array('sites[%d].arrayToClob', i);
END LOOP;
where l_value is type json_array_t... but of course is not working. I've tried also with varchar2 type and I've check other options here https://docs.oracle.com/cd/E59726_01/doc.50/e39149/apex_json.htm#AEAPI29655
I don't know how to approach it, I don't know if it's even possible what I want... any tips will be welcome.
Thanks in advance

Answer 1

You mean that the value for "field1" is a CLOB value in your actual data ? If that is not the case and it is just a varchar it's possible to use JSON_TABLE to get what you want in a plain SQL statement. Note that APEX_JSON isn't very performant.
with json_tab AS
(
SELECT
'{
"sites": [
{
"code": "code",
"siteName": "site name",
"country": "country",
"arrayToClob": [
{
"field1": "field 1",
"field2": "field 2"
}
]
}
]
}' as data FROM DUAL
)
SELECT jt.code, jt.field1, jt.field2
FROM json_tab t,
JSON_TABLE(
data,
'$.sites[*]'
columns (
code VARCHAR2(100) PATH '$.code',
NESTED PATH '$.arrayToClob[*]'
columns (
field1 VARCHAR2(32000) PATH '$.field1',
field2 VARCHAR2(32000) PATH '$.field2'
)
)
) jt;
JSON_TABLE does not support CLOB datatype as column - so if it really is a CLOB it won't work.