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Chris Saxon

Thanks for the question, Ram.

Asked: September 29, 2016 - 7:45 am UTC

Last updated: September 29, 2016 - 1:09 pm UTC

Version: 12.1.0.2.0

Viewed 1000+ times

You Asked

Hi AskTom,

First of all thanks for your contribution to oracle Community! :-)


I have this problem where i want to parse a json file stored in clob column and after parsing i have to store it in separate table , i am able to parse this through sql query uisng dot notation but to make solution more robust i want to do it through procedure . Can you please suggest what is the best way to do it .

create table json_test
(json_doc clob);

insert into json_test values ('{
"department": {
"department_number": 10,
"department_name": "ACCOUNTING",
"employees": [
{
"employee_number": 7782,
"employee_name": "CLARK"
},
{
"employee_number": 7839,
"employee_name": "KING"
},
{
"employee_number": 7934,
"employee_name": "MILLER"
}
]
},
"metadata": {
"published_date": "04-APR-2016",
"publisher": "oracle-base.com"
}
}');


i want to insert 3 different rows in my employee table for corresponding json file.


Thanks in Advance!

and Connor said...

You can use the JSON_TABLE syntax for this

SQL> create table json_test
  2  (json_doc clob);

Table created.

SQL>
SQL>
SQL>
SQL> insert into json_test values ('{
  2  "department": {
  3  "department_number": 10,
  4  "department_name": "ACCOUNTING",
  5  "employees": [
  6  {
  7  "employee_number": 7782,
  8  "employee_name": "CLARK"
  9  },
 10  {
 11  "employee_number": 7839,
 12  "employee_name": "KING"
 13  },
 14  {
 15  "employee_number": 7934,
 16  "employee_name": "MILLER"
 17  }
 18  ]
 19  },
 20  "metadata": {
 21  "published_date": "04-APR-2016",
 22  "publisher": "oracle-base.com"
 23  }
 24  }');

1 row created.

SQL> select dname, emp_name, emp_num
  2  from json_test,
  3       json_table(json_doc,'$.department'
  4       columns (
  5         dname varchar2(30) path '$.department_name'
  6        ,nested path '$.employees[*]'
  7                columns (
  8                   emp_name varchar2(20) path '$.employee_name',
  9                   emp_num number  path '$.employee_number'
 10                )
 11         )
 12       );

DNAME                          EMP_NAME                EMP_NUM
------------------------------ -------------------- ----------
ACCOUNTING                     CLARK                      7782
ACCOUNTING                     KING                       7839
ACCOUNTING                     MILLER                     7934


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Comments

Variation of JSON Table

Rajeshwaran, Jeyabal, September 29, 2016 - 2:07 pm UTC 

demo@ORA12C> select json_value(json_doc, '$.department.department_number') dept_no,
  2         json_value(json_doc, '$.department.department_name') dname,
  3         t2.empno, t2.ename
  4  from json_test t1 ,
  5    json_table( json_doc, '$.department.employees[*]'
  6        columns( empno number path '$.employee_number' ,
  7                 ename varchar2(20) path '$.employee_name') ) t2
  8  /

DEPT_NO    DNAME                EMPNO ENAME
---------- --------------- ---------- --------------------
10         ACCOUNTING            7782 CLARK
10         ACCOUNTING            7839 KING
10         ACCOUNTING            7934 MILLER

3 rows selected.

demo@ORA12C>

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