postgresql - 使用 PostgreSQL 在 NESTED JSONB 数组中添加对象

Question

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)

我想根据 id 条件 "id": "RO".Eample "z4": [{ "name": "john" }, { "name": "Steve" } 更新一个新归档的 z4

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"
                },{
                    "name": "Steve"
                }]
            }
        ]
    }
}

我可以使用什么 postgres JSONB sql 来实现上述输出？

标签： postgresqljsonb

Answer 1

你应该可以这样做：

with zd as (select ('{x4,y1,'||index-1||',z3}')::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  

请注意，jsonb_set 中的最后一个参数现在为 true，如果该字段不存在，则指示它创建该字段。

最好的问候，
Bjarni