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PLSQL JSON_TABLE Examples

Posted on July 15, 2022November 8, 2024

Create JSON from Cursor

Declare
   c_cur       Sys_Refcursor;
   l_json_clob Clob;
Begin
   Open c_cur For
      Select 1      As cl01
            ,Cursor (Select 2      As cl02_1
                          ,Cursor (
                                  
                                  Select 1 As cl02_2
                                  From   dual
                                  Union All
                                  Select 2
                                  From   dual
                                  Union All
                                  Select 3
                                  From   dual) As cl02_2
                    
                    From   dual) As cl02
      From   dual;
   apex_json.initialize_clob_output(p_indent => 2);
   apex_json.open_object;
   apex_json.write('rws', c_cur);
   apex_json.close_object;
   l_json_clob := apex_json.get_clob_output();
   dbms_output.put_line(l_json_clob);
   apex_json.free_output;
End;
/


-- use "returning clob" behind each ()  to avoid max 4000 character error 
SELECT json_arrayagg(json_object('region' :region_name, 'countries' :(
         SELECT json_arrayagg(json_object('id' :country_id,
                                          'name' :country_name))
           FROM oehr_countries c
          WHERE c.region_id = r.region_id), region_name :(
           SELECT json_arrayagg(country_name)
             FROM oehr_countries c
            WHERE c.region_id = r.region_id), 'multi_d_array' :(
             select json_arrayagg(json_arrayagg(c.country_name
                                          order by
                                          c.country_name))
               from oehr_countries c
              inner join oehr_regions r
                 on (r.region_id = c.region_id)
              group by r.region_name)) returning JSON) -- remove "returning JSON" gives string
             
               FROM oehr_regions r;

-- to create multi dimensional array
select json_arrayagg(json_arrayagg(c.country_name order by c.country_name ))
  from oehr_countries c
 inner join oehr_regions r
    on (r.region_id = c.region_id)
 group by r.region_name;

JSON_TABLES

To convert json nested objects with arrays and sub arrays, Format JSON can be used

Select *
  From json_table('{
    "DECLARATION": {
        "FUNCTIONALREFERENCEID": 50286,
        "ID": 1,
        "LANGUAGECODE": "NL",
        "GOODSSHIPMENT": {
            "SEQUENCENUMERIC": 1,
            "TRANSACTIONNATURECODE": 99,
            "GOVERNMENTAGENCYGOODSITEM": [
                {
                    "SEQUENCENUMERIC": 1,
                    "STATISTICALVALUEAMOUNT": 23,
                    "TRANSACTIONNATURECODE": 90001,
                    "DISPATCHCOUNTRYCODE": 90002,
                    "ACCEPTANCEDATETIME": 90003,
                    "DUTYTAX_FEES": [
                        {
                            "SEQUENCE": 1,
                            "TYPECODE": "X",
                            "PAYMENT_METHOD": "AR",
                            "TAX_BASE": [
                                {
                                    "SEQUENCE": 1,
                                    "AMOUNT": 10,
                                    "ADAMOUNT": 22
                                },
                                {
                                    "SEQUENCE": 2,
                                    "AMOUNT": 20,
                                    "ADAMOUNT": 32
                                }
                            ]
                        },
                        {
                            "SEQUENCE": 2,
                            "TYPECODE": "Y",
                            "PAYMENT_METHOD": "AT",
                            "TAX_BASE": [
                                {
                                    "SEQUENCE": 1,
                                    "AMOUNT": 10,
                                    "ADAMOUNT": 22
                                }
                            ]
                        }
                    ]
                },
                {
                    "SEQUENCENUMERIC": 2,
                    "STATISTICALVALUEAMOUNT": 23,
                    "TRANSACTIONNATURECODE": 900088,
                    "DISPATCHCOUNTRYCODE": 90002,
                    "ACCEPTANCEDATETIME": 90003,
                    "DUTYTAX_FEES": [
                        {
                            "SEQUENCE": 1,
                            "TYPECODE": "XXXSSS",
                            "PAYMENT_METHOD": "TTTT",
                            "TAX_BASE": [
                                {
                                    "SEQUENCE": 1,
                                    "AMOUNT": 10,
                                    "ADAMOUNT": 22
                                },
                                {
                                    "SEQUENCE": 2,
                                    "AMOUNT": 20,
                                    "ADAMOUNT": 32
                                }
                            ]
                        },
                        {
                            "SEQUENCE": 2,
                            "TYPECODE": "@#!@",
                            "PAYMENT_METHOD": "@SDSD",
                            "TAX_BASE": [
                                {
                                    "SEQUENCE": 1,
                                    "AMOUNT": 10,
                                    "ADAMOUNT": 22
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    }
}'
                  ,'$."DECLARATION"."GOODSSHIPMENT"."GOVERNMENTAGENCYGOODSITEM"[*]'
                   columns(sequence Varchar2(600) path '$."SEQUENCENUMERIC"'
                          ,statistical_value_amount Varchar2(600) path '$."STATISTICALVALUEAMOUNT"'
                          ,transaction_nature_code Varchar2(600) path '$."TRANSACTIONNATURECODE"'
                          ,dispatch_country_code Varchar2(600) path '$."DISPATCHCOUNTRYCODE"'
                          ,commodity_description Varchar2(600) path '$."COMMODITY"."DESCRIPTION"'
                          ,duty_tax_fee_array Clob format json path '$."DUTYTAX_FEES"'
                          ,Nested path '$."DUTYTAX_FEES"[*]'
                           columns(duty_tax_sequence Varchar2(600) path '$."SEQUENCE"'
                                  ,typecode Varchar2(600) path '$."TYPECODE"'
                                  ,tax_base Clob format json path '$."TAX_BASE"'
                                  ,Nested path '$."TAX_BASE"[*]' columns(tax_base_seq Varchar2(600) path '$."SEQUENCE"')))) jt;


Select jt.total_entries
      ,jt.dialog_id
      ,jt.user_id
      ,jt.last_message_sender
      ,jt.last_message_senderid
      ,jt.last_message
      ,to_date('19700101', 'YYYYMMDD') + (1 / 24 / 60 / 60) * jt.last_message_date_sent
From   json_table('{  "total_entries": 1,
                      "skip": 0,
                      "limit": 100,
                      "items": [
                          {
                              "_id": "627426fdecbc270011a6cd21",
                              "user_id": 5768417,
                              "created_at": "2022-05-05T19:35:25Z",
                              "updated_at": "2022-05-05T19:35:32Z",
                              "name": "Leon Luiken",
                              "type": 3,
                              "photo": null,
                              "occupants_ids": [
                                  5768417,
                                  5772962
                              ],
                              "occupants_count": 2,
                              "is_e2ee": false,
                              "is_muted": false,
                              "last_message": "Thanks for accepting my request!",
                              "last_message_date_sent": 1651779332,
                              "last_message_id": "627427048bc0af33d8000001",
                              "last_message_user_id": 5772962,
                              "last_message_status": null,
                              "unread_messages_count": 1,
                              "pinned_messages_ids": [],
                              "description": null,
                              "xmpp_room_jid": null,
                              "admins_ids": []
                          }
                      ]
                  }','$' columns(total_entries Number path '$."total_entries"'
                         ,Nested path '$.items[*]'
                          columns(dialog_id Varchar2 path '$."_id"'
                                 ,user_id Number path '$."user_id"'
                                 ,last_message_sender Varchar2 path '$."name"'
                                 ,last_message_senderid Number path '$."last_message_user_id"'
                                 ,last_message Varchar2 path '$."last_message"'
                                 ,last_message_date_sent Number path '$."last_message_date_sent"'))) jt;

--------------------------------------------------------------------------
Select jt.*
From   pwc_purchaseorder po
      ,json_table(po.po_document columns(
                          "AllowPartialShipment"
                          ,"PONumber"
                          ,Nested 
                                 "LineItems" [*] 
                                 columns(
                                  itemnumber varchar2 path "ItemNumber"
                                 ,descriptions path "Part"."Description"
                                 ,unitprice path "Part"."UnitPrice"
                                 ,qty number path "Quantity"))) As "JT";
---------------------------------------------------------------------------
Select jt.*
From   pwc_purchaseorder po
      ,json_table (po.po_document
                  ,'$'COLUMNS (
                               "ponum" number Path '$.PONumber'
                              ,requester varchar2(30) path '$.Requestor'
                              ,"Special Instructions" VARCHAR2(4000) PATH '$."Special Instructions"'                         
                              ,NESTED PATH '$.LineItems[*]?(@.ItemNumber > 1)' COLUMNS (
                                                                   ItemNumber NUMBER PATH '$.ItemNumber',
                                                                   Description VARCHAR(4000) PATH '$.Part.Description'))) AS "JT";

 


Select id
      ,"Requestor"
       ,"type"
       ,"number"
From   pwc_purchaseorder
Left   Outer Join json_table(
             po_document columns(
                         "Requestor"
                         , Nested "ShippingInstructions"."Phone" [ * ] columns(
                                                                                "type"
                                                                               ,"number"
                                                                              )
                                )
                            ) 
 On 1 = 1;



Select id
      ,"Requestor"
       ,"type"
       ,"number"
From   pwc_purchaseorder 
Nested po_document columns(
                            "Requestor"
                            , Nested "ShippingInstructions"."Phone" [ * ] columns(
                                                                                   "type"
                                                                                  ,"number")
                          );

--- 
Select json_value(po_document
                 ,'$.Requestor' Returning Varchar2(32))
      ,json_query(po_document
                 ,'$.ShippingInstructions.Phone' Returning Varchar2(100))
From   pwc_purchaseorder
Where  json_exists(po_document
                  ,'$.ShippingInstructions.Address.zipCode')
And    json_value(po_document
                 ,'$.AllowPartialShipment' Returning Varchar2(5 Char)) = 'true';
------ Json Column ----- 
Select t.po_document
From   pwc_purchaseorder t;

Select po.po_document."ShippingInstructions"."Phone"
From   pwc_purchaseorder po;

Select po.po_document."ShippingInstructions"."Phone"."number"
From   pwc_purchaseorder po;

Select po.po_document."ShippingInstructions"."Phone"."type"
From   pwc_purchaseorder po;

------ json pretty ----- 
Select json_serialize(t.po_document Returning Clob pretty)
From   pwc_purchaseorder t;

------ Remove Node  ----- 
Select json_transform(t.po_document, remove '$."Special Instructions"' Returning Clob pretty)
From   pwc_purchaseorder t;

Update JSON column node values

Update pwc_purchaseorder
Set    po_document = json_transform(po_document
                                   ,Set '$.chaoyu' = 'ss');

------ create new json object within json ----

Update pwc_purchaseorder t
Set    t.po_document = json_transform(t.po_document
                                     ,Set '$.JonSnow' = '{"Name":"John Snow","Age":28,"From Show":"GOT"}' format json);

----- replace an existing filed value

Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,Set '$.Addresses' = '{"street":"8 Timbly Rd.","city":"Penobsky","state":"UT"}'
                                      format json ignore On missing);

----- Set Boolean to value

Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,Set '$.AllowPartialShipment' = 'true' format json);

----- Update Array

Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,Set '$.ShippingInstructions.Phone[0]' = '909-555-1212');


----- update with where clause
Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,Set '$.Requestor' = 'Sarah Bell')
Where  json_exists(t.po_document
                  ,'$?(@.PONumber == 1700)');

----- prepending to array 

/*This prepends element "909-555-1212" to array Phone. Insertion at position 0 shifts all
existing elements to the right: element N becomes element N+1.*/
Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,Insert '$.ShippingInstructions.Phone[0]' = '909-555-1212');

----- appending to array 

Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,append '$.ShippingInstructions.Phone' = '909-555-1212');
Update pwc_purchaseorder t
Set    t.po_document = json_transform(po_document
                                     ,Insert '$.ShippingInstructions.Phone[last+1]' = '909-555-1212');

----- Modifying JSON Data On the Fly With JSON_MERGEPATCH
                      
Select json_mergepatch(po_document, '{"Special Instructions":null}' Returning Clob pretty)
From   pwc_purchaseorder;

----- remove element by set it to null 

Update pwc_purchaseorder
Set    po_document = json_mergepatch(po_document
                                    ,'{"Special Instructions":null}');

Update pwc_purchaseorder
Set    po_document = json_mergepatch(po_document
                                    ,'{"Category" : "Platinum",
                                       "ShippingInstructions" : null,
                                       "Special Instructions" : "Contact User SBELL",
                                       "LineItems" : [],
                                       "AllowPartialShipment" : null,
                                       "Allow Partial Shipment" : false }');

Update pwc_purchaseorder
Set    po_document = json_mergepatch(po_document
                                    ,'{ "PONumber" : 1600,
                                         "Reference" : "ABULL-20140421",
                                         "Requestor" : "Alexis Bull",
                                         "User" : "ABULL",
                                         "CostCenter" : "A50",
                                         "Special Instructions" : "Contact User SBELL",
                                         "Allow Partial Shipment" : false,
                                         "LineItems" : [],
                                         "Category" : "Platinum" }
                                    
                                    ');

Query from JSON column

----- Query Json data 
Select t.po_document."LineItems"                 [ 1 ]
       ,t.po_document."LineItems"                 [ * ]
       ,t.po_document."ShippingInstructions".name
From   pwc_purchaseorder t;

Select json_value(po_document
                 ,'$.PONumber') -- return scalar
From   pwc_purchaseorder;

Select po.po_document."PONumber"
From   pwc_purchaseorder po;

Select po.po_document."ShippingInstructions"."Phone"
From   pwc_purchaseorder po;

Select json_query(po_document
                 ,'$.ShippingInstructions.Phone')
From   pwc_purchaseorder;

Select po.po_document."ShippingInstructions"."Phone".type As t
From   pwc_purchaseorder po;

Select json_query(po_document
                 ,'$.ShippingInstructions.Phone.type' With Array wrapper) As t -- array with wrapper
From   pwc_purchaseorder;

--------- query filtering 

Select json_query(t.po_document
                 ,'$.LineItems[*]?(@.Quantity == 5)' With Array wrapper)
From   pwc_purchaseorder t;

Select json_query(t.po_document
                 ,'$.LineItems[*]?(@.Quantity > 5)' With Array wrapper)
From   pwc_purchaseorder t;

Select json_query(t.po_document
                 ,'$.ShippingInstructions.Phone[*]?(@.type != "Office").number' With Array wrapper)
From   pwc_purchaseorder t;

Select json_query(t.po_document
                 ,'$.ShippingInstructions?(@.name == "Alexis Bull").Phone' With Array wrapper)
From   pwc_purchaseorder t;

Select json_query(t.po_document
                 ,'$.ShippingInstructions?(@.name == "Alexis Bull").Phone.type' With Array wrapper)
From   pwc_purchaseorder t;

JSON propertity

Select json_query('["alpha", 42, "10.4"]'
                 ,'$[*].stringOnly()' With conditional Array wrapper)
From   dual;

Select json_value('[19, "Oracle", {"a":1},[1,2,3]]'
                 ,'$.type()')
From   dual;  -- array 


Select json_value('[19, "Oracle", {"a":1},[1,2,3]]'
                 ,'$.type()')
From   dual; -- array 

Select json_value('[19, "Oracle", {"a":1},[1,2,3]]'
                 ,'$.size()')
From   dual; --4

Select json_value(json_query(t.po_document
                            ,'$.ShippingInstructions?(@.name == "Alexis Bull").Phone.type' With Array wrapper)
                 ,'$.size()') As array_size
From   pwc_purchaseorder t;

Select to_char(json_value('{"a" : "2019-01-02T12:34:56"}'
                         ,'$.a' Returning Timestamp)
              ,'DD-MON-YYYY HH24:MI:SS TZR')
From   dual;

Select Cast(json_value('{"a" : "2019-01-02T12:34:56"}'
                      ,'$.a' Returning Timestamp) As Date)
From   dual;

JSON where clause

Select po.po_document
From   pwc_purchaseorder po
Where  json_exists(po.po_document
                  ,'$?(@.PONumber == 1700)');
/*
WHERE json_exists(po.po_document,
                  '$?(@.LineItems.Part.UPCCode == 85391628927)');

WHERE json_exists(po.po_document,
                  '$.LineItems?(@.Part.UPCCode == 85391628927)');

WHERE json_exists(po.po_document,
                  '$.LineItems.Part?(@.UPCCode == 85391628927)');
*/

Select po.po_document
   From   pwc_purchaseorder po
   Where  json_exists(po.po_document
                     ,'$?(@.LineItems.Part.UPCCode == 85391628927
                                        && @.LineItems.Quantity > 3)');

Select po.po_document
From   pwc_purchaseorder po
Where  json_exists(po.po_document
                  ,'$.LineItems[*]?(@.Part.UPCCode == 85391628927
                                                   && @.Quantity > 3)');

Select po.po_document
From   pwc_purchaseorder po
Where  json_exists(po.po_document
                  ,'$?(@.User == "ABULL"
                        && exists(@.LineItems?(@.Part.UPCCode == 85391628927
                                               && @.Quantity > 3)))');
Declare
   b        Boolean;
   jsondata Clob;
Begin
   Select po_document
   Into   jsondata
   From   pwc_purchaseorder
   Where  rownum = 1;
   b := json_value(jsondata
                  ,'$.AllowPartialShipment' Returning Boolean error On error);
End;
/
Select json_value(po_document
                    ,'$.AllowPartialShipment')
--- JSON_VALUE: Returning a JSON Boolean Value to SQL as VARCHAR2
From   pwc_purchaseorder;

JSON PLSQL Types

Create Or Replace Type pwc_shipping_t As Object(Name Varchar2(30)
                                               ,address pwc_addr_t);
Create Or Replace Type pwc_addr_t As Object(street Varchar2(100)
                                           ,city Varchar2(30));

Select json_value(po_document
                 ,'$.ShippingInstructions' Returning pwc_shipping_t) As t
From   pwc_purchaseorder;

-- create array type ----
Create Or Replace Type pwc_part_t As Object(description Varchar2(30)
                                           ,unitprice Number);
Create Or Replace Type pwc_item_t As Object(itemnumber Number
                                           ,part);
Create Or Replace Type pwc_items_t As Varray(10) Of pwc_item_t;

Select json_value(po_document
                 ,'$.LineItems' Returning pwc_items_t)
From   pwc_purchaseorder;

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