更新postgres jsonb列

Question

I have below json string in my table column which is of type jsonb,

{
    "abc": 1,
    "def": 2
}

i want to remove the "abc" key from it and insert "mno" with some default value. i followed the below approcach for it.

UPDATE books SET books_desc = books_desc - 'abc';
UPDATE books SET books_desc = jsonb_set(books_desc, '{mno}', '5');

and it works.

Now i have another table with json as below,

{
    "a": {
        "abc": 1,
        "def": 2
    },
    "b": {
        "abc": 1,
        "def": 2
    }
}

Even in this json, i want to do the same thing. take out "abc" and introduce "mno" with some default value. Please help me to achieve this.

The keys "a" and "b" are dynamic and can change. But the values for "a" and "b" will always have same keys but values may change. I need a generic logic.

Requirement 2:

abc:true should get converted to xyz:1.

abc:false should get converted to xyz:0.

Answer 1

demo:db<>fiddle

Because of a possible variety of your JSON keys it might be complicated to generate a common query. This is because you need to give the path within the json_set() function. But without actual values it would be hard.

A simple work-around is using the regexp_replace() function on the text representation of the JSON string to replace the relevant objects.

UPDATE my_table
SET my_data = 
    regexp_replace(my_data::text, '"abc"\s*:\s*\d+', '"mno":5', 'g')::jsonb

Answer 2

For added requirement 2:

I wrote the below query based on already given solution:

UPDATE books
SET book_info = 
    regexp_replace(book_info::text, '"abc"\s*:\s*true', '"xyz":1', 'g')::jsonb; 

UPDATE books
SET book_info = 
    regexp_replace(book_info::text, '"abc"\s*:\s*false', '"xyz":0', 'g')::jsonb;