Laravel sql search json type column

问题

The mysql has table 'subscribe' table and it's as follows:

column   type
id        int
condition  json
type_id    id

and the example as follows:

"id": "1",
"condition": "{\"id\":\"2\",\"class\":\"master\",\"zone\":\"west\",\"price\":\"511\"}",
"type_id": "1"

and I want to select the column which match in the column condition like "zone"="west" the laravel 5.2 has support the order

 $subscribe = DB::table('subscribe')->where('condition->class', 'master')->get();

Error

 Column not found: 1054 Unknown column 'condition->class' in 'where clause'(
SQL: select * from `subscribe` where `condition->class` = master)

I need is get the term which match the condition where conditon->class = master .I need to select the data which match the need in the model. I don't know what's wrong. Any help would be much appreciated.

回答1:

I believe the correct syntax is:

 $subscribe = DB::table('subscribe')->where('condition->"$.class"', 'master')->get();

See the example below this paragraph, on https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html

• column->path

In MySQL 5.7.9 and later, the -> operator serves as an alias for the JSON_EXTRACT() function when used with two arguments, a column identifier on the left and a JSON path on the right that is evaluated against the JSON document (the column value). You can use such expressions in place of column identifiers wherever they occur in SQL statements.

回答2:

The thing is the where clause in query is considering as a column name in condition->class and not as a laravel code. you want to extract the value from json. but the query doesn't understand that.

What you need to do is pass entire table as it is in json format to the view and then extract in the view.

I suggest do something like this : Here, $subscribe has entire table in json . which you can access it by :

$subscribe = DB::table('subscribe')->all();

return response()->json(array('subscribe' => $subscribe));

Then in the view do:

@if($subscribe->condition->class == 'master')

id      : {{ $subscribe->id }}
type id : {{ $subscribe->type_id }}

@endif

Updated Code

//get condition in json
$subscribe = DB::table('subscribe')->select('condition')->get();

then, 

// convert json to array
$subscribe_array = json_decode($subscribe, true);
//  create a new collection instance from the array
$collection_array = collect($subscribe_array);


if($collection_array['class'] == 'master')
{

//do something

}

Something like this do the trick

来源：https://stackoverflow.com/questions/36957717/laravel-sql-search-json-type-column