build multiple json hash in same json in oracle - sql

Question

below two queries are returning a separate JSON when I merge the data. it's showing in invalid data.
SELECT JSON_OBJECT('Agriculture_Expenses' value
JSON_ARRAYAGG(JSON_OBJECT('Acreage12' value acreage,
'Farmer_projected' value
sellingprice,
'Projected_Expense' value attr1,
'Pattern1' value crop
)
-- JSON_OBJECT('ITEM' VALUE .50)
))
INTO AFL_JSON
FROM AGRI_INCOME
WHERE ATTR2 = 'AGRICULTURE_INCOME';
SELECT JSON_OBJECT('Cash_Flow_Form' value
JSON_ARRAYAGG(JSON_OBJECT('Agri_Coapp1' value rec.Coapp1,
'Agri_Coapp2' value rec.Coapp2,
'Agri_Coapp3' value rec.Coapp3,
'Lease_Land' value
rec.lease_land,
'Total_Land' value '',
'Land_under_cultivation1' value
rec.Land_under_cultivation,
'App_agr_lan' value
rec.Land_Holding)
))
INTO AFL_JSON
FROM dual;
DBMS_OUTPUT.PUT_LINE(AFL_JSON_DATA);
below two query is returning a data as below format extra { is coming when i merge two json object how can i get the data in below format.
{
"Cash_Flow_Form": [
{
"Agri_Coapp1": "1",
"Agri_Coapp2": "2",
"Agri_Coapp3": null,
"Lease_Land": "2",
"Total_Land": null,
"Land_under_cultivation1": "4",
"App_agr_lan": "5"
}
],
"Agriculture_Expenses": [
{
"Acreage12": "2",
"Farmer_projected": "2500",
"Projected_Expense": "81400",
"Pattern1": "Khariff"
}
]
}

Answer 1

You can use JSON_MERGEPATCH() function within a SELECT statement CROSS JOINing those JSON_OBJECTs
WITH AGRI_INCOME_JS AS
(
SELECT JSON_OBJECT( 'Agriculture_Expenses' value
JSON_ARRAYAGG(JSON_OBJECT ('Acreage12' value accreage,
'Farmer_projected' value sellingprice,
'Projected_Expense' value attr1,
'Pattern1' value crop
)
)
) AS JS2
FROM AGRI_INCOME
WHERE ATTR2 = 'AGRICULTURE_INCOME'
), CASH_FLOW_JS AS
(
SELECT JSON_OBJECT('Cash_Flow_Form' value
JSON_ARRAYAGG(JSON_OBJECT('Agri_Coapp1' value coapp1,
'Agri_Coapp2' value coapp2,
'Agri_Coapp3' value coapp3,
'Lease_Land' value lease_land,
'Total_Land' value Total_Land,
'Land_under_cultivation1' value Land_under_cultivation,
'App_agr_lan' value Land_Holding
)
)
) AS JS1
FROM CASH_FLOW
)
SELECT JSON_MERGEPATCH(JS1,JS2) AS "Result JSON"
FROM CASH_FLOW_JS
CROSS JOIN AGRI_INCOME_JS
The above query works for 18+, If your DB version is 12c, then use :
WITH AGRI_INCOME_JS AS
(
SELECT JSON_OBJECT( 'Agriculture_Expenses' value
JSON_ARRAYAGG(JSON_OBJECT ('Acreage12' value accreage,
'Farmer_projected' value sellingprice,
'Projected_Expense' value attr1,
'Pattern1' value crop
)
)
) AS JS2
FROM AGRI_INCOME
WHERE ATTR2 = 'AGRICULTURE_INCOME'
), CASH_FLOW_JS AS
(
SELECT JSON_OBJECT('Cash_Flow_Form' value
JSON_ARRAYAGG(JSON_OBJECT('Agri_Coapp1' value coapp1,
'Agri_Coapp2' value coapp2,
'Agri_Coapp3' value coapp3,
'Lease_Land' value lease_land,
'Total_Land' value Total_Land,
'Land_under_cultivation1' value Land_under_cultivation,
'App_agr_lan' value Land_Holding
)
)
) AS JS1
FROM CASH_FLOW
), JS(JS) AS
( SELECT JS1 FROM CASH_FLOW_JS
UNION ALL
SELECT JS2 FROM AGRI_INCOME_JS)
SELECT REPLACE(REPLACE(REPLACE(REPLACE(JSON_ARRAYAGG(JS),'\'),'["'),'"]'),'}","{',',')
AS "Result JSON"
FROM JS
Demo