查询json数据结构的8种方式

jsonsql.query("select * from json.channel.items order by title desc",json);

jsonPath( books, ‘$..book[(@.length-1)]‘)

Jf("> vegetables > *[color=Orange]",Food).get();

var kelly = friends({id:2}).first();

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var queryResult2 = Enumerable.From(jsonArray)

    .Where("$.user.id < 200")

    .OrderBy("$.user.screen_name")

    .Select("$.user.screen_name + ‘:‘ + $.text")

    .ToArray();

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var res = $objeq(data, "age > 40 && gender == ‘female‘ -> name");

    // --> Returns [‘Jessica‘]

.lang:val("Bulgarian") ~ .level

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var a = [1,2,3,4,5,6,7,8,9,10];

        // return everything

        a.where( "( ) => true" ) ;

        //  --> [1,2,3,4,5,6,7,8,9,10]

        // return even numbers

        a.where( "( n, i ) => n % 2 == 0" ) ;

        //  --> [2,4,6,8,10]

        // query first 6 products whose category begins with ‘con‘ using extra param and regular expression

        products.where( "( el, i, res, param ) => res.length <= 6 && param.test( el.cat )", /^con/i);

        // using customer table data from SQL Server‘s northwind database...   

        customers.where( "( el, i, res, param ) => el.country == param", "USA" );