使用PostgreSQL在NESTED JSONB数组中添加/更新对象和元素

问题描述

Json请求:

INSERT INTO test.demotbl (data)
VALUES ('{
    "x1": "Americas",
    "x2": "West",
    "x3": [{
        "x_id": "sam"
    }],
    "x4": {
        "a1": true,
        "a2": false,
        "a3": [
            "xx",
            "xx"
        ],
        "a4": [
            "Josh"
        ],
        "y1": [{
                "id": "RW",
                "z2": true,
                "z3": "USER"

            },
            {
                "id": "RO",
                "z2": false,
                "z3": "SELECT"

            }
        ]
    }
}'::jsonb)

我想基于id"id":"RO"更新归档的z4.

I want to update the filed z4 based on id "id": "RO".

当我需要更新以下查询中使用的z4字段时，我在这里有类似的用例:

I had similar use case here when i needed to update the z4 field used below query:

with zd as (select ('{x4,y1,'||index-1||',z4}')::text[] as path
            from table1
            ,jsonb_array_elements((field1->>'x4')::jsonb->'y1') 
            with ordinality arr(x,index)
            where x->>'id'='RO'
        )
update table1
set field1=jsonb_set(field1,zd.path,to_jsonb('[ { "name": "john" } ]'::jsonb),false)
from zd

但是现在在当前json中，归档的X4不存在，我需要添加"z4":[{ 名称":约翰" }，而不只是更新字段

But now in the current json the filed X4 is not there and i need to add "z4": [{ "name": "john" } instead of just updating the field

预期输出:

{
    "x1": "Americas",
    "x2": "West",
    "x3": [{
        "x_id": "sam"
    }],
    "x4": {
        "a1": true,
        "a2": false,
        "a3": [
            "xx",
            "xx"
        ],
        "a4": [
            "Josh"
        ],
        "y1": [{
                "id": "RW",
                "z2": true,
                "z3": "USER"

            },
            {
                "id": "RO",
                "z2": false,
                "z3": "SELECT",
                "z4": [{
                    "name": "john"
                }]
            }
        ]
    }
}

是否可以修改以上查询或建议使用新查询以同时适用于add(如果没有归档z4)和更新归档z4示例"z4":[{"name":"john"}，{"name :" Steve}](如果存在提交的z4.

Can the above query be modified or suggest a new query to work for both add(if filed z4 is not there) and update filed z4 example "z4": [{ "name": "john" },{ "name": "Steve" }] if filed z4 is present.

推荐答案

如果要添加z4，则只需将jsonb_set函数中的最后一个参数更改为"true"，而不是"false".这指示函数创建该字段(如果该字段不存在).您需要将to_jsonb(...)更改为'....':: jsonb才能解析数组.
这应该可行:

If you want to add z4, you only need to change the last argument in the jsonb_set function to "true" instead of "false". This instructs the function to create the field if it doesn't exist.You need to change the to_jsonb(...) to '....'::jsonb to parse the array.
This should work:

with zd as (select ('{x4,y1,'||index-1||',z4}')::text[] as path
            from table1
            ,jsonb_array_elements((field1->>'x4')::jsonb->'y1') 
            with ordinality arr(x,index)
            where x->>'id'='RO'
        )
update table1
set field1=jsonb_set(field1,zd.path,'[{ "name": "john" },{ "name": "Steve" }]'::jsonb,true)
from zd

我希望我在这里正确粘贴并修改了它:-)
最好的问候，
比尼亚尼

I hope I got this correctly pasted and modified in here :-)
Best regards,
Bjarni

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