How to show proper json response from Scala controller class?

问题

I am trying to get json response from Postgresql database(v9.5) table to display on my view page, I have tried the following, as my application is executing fine, but I am not getting/displaying my required proper json data(as it is containing: Stream, slashes() and question mark(?), like Stream type json). Please let me know that how to show my desired output like below ? my output:

Stream("[{\"_testid\":{\"testid0\":\"testnumber\"},\"testtitle\":\"TestTitle\"}]", ?)

but my desired output:

[{"_testid":{"testid0":"testnumber"},"testtitle":"TestTitle"}]

contorller:

class Test extends Controller {
    def getTest = Action { 
    var sql: SqlQuery = SQL("select name::TEXT from test");
    def values: String =  DB.withConnection { implicit connection => 
    sql().map(row => row[String]("name")).toString
    }
    Ok(values)
    }

table:

create table test(
    id serial primary key,
    name json not null);

回答1:

As indicated in the documentation, Anorm comes with column parsers for the JDBC standart types.

PostgreSQL JSON type is not one of those. It's a vendor specific type.

You can deal with this specific conversion in the statement, by casting the SQL column to TEXT before to go through the JDBC (as plain JDBC String so).

SELECT json_col::TEXT FROM test

You can implement a custom Column[JsValue] (see documentation), that convert the PGObject specific to the PostgreSQL JDBC driver into a Play JsValue.

You can map the column as anorm.Object (SqlParser.get[anorm.Object]("col")), and deal with the opaque value in your application.

来源：https://stackoverflow.com/questions/35619921/how-to-show-proper-json-response-from-scala-controller-class

标签

json

postgresql

scala

playframework

anorm