Query on jsonb array - json

Question

I have this kind of json array and i want to check stringValue inside value array is null or not plus i want to check it with its id and fielddata is column name
[
{
"name": "50a5613e97e04cb5b8d32afa8a9975d1",
"value": {
"stringValue": null
}
},
{
"name": "bb127e8284c84692aa217539c4312394",
"value": {
"dateValue": 1549065600
}
}
]
query is:
select *
from field
WHERE (fielddata->>'name') = '50a5613e97e04cb5b8d32afa8a9975d1'
AND fielddata->'value'->>'stringValue' IS NOT NULL;
and I want use this query in laravel5.7

Answer 1

Try this
$result = \DB::table('field')->where('name', "50a5613e97e04cb5b8d32afa8a9975d1" )->where('value', $stringValue)->get();
if(isset($result)){
foreach($result as $res){
if(isset($res['value']->stringValue)){
// not null case
}else{
// null case
}
}
}

Answer 2

Within a SQL query, I think you want something like this:
select t.*
from the_table t
where exists (select *
from jsonb_array_elements(t.fielddata) as j(e)
where e ->> 'name' = '50a5613e97e04cb5b8d32afa8a9975d1'
and e -> 'value' ->> 'stringValue' is not null);
The exists sub-query will check every array element and see if at least one element has the specified name and a non-null stringValue. The query will then return the complete row from the table that fulfills the condition.
Online example: https://rextester.com/AGGJNR88809