How to access a RowDataPacket object

Question

I\'m currently developing a desktop application with Node-webkit. During that process I need to get some data from a local MySQL-database.

The querying works fine, b

Answer 1

I found an easy way

Object.prototype.parseSqlResult = function () {
    return JSON.parse(JSON.stringify(this[0]))
}

At db layer do the parsing as

let users= await util.knex.raw('select * from user')
    return users.parseSqlResult()

This will return elements as normal JSON array.

Answer 2

I had this problem when trying to consume a value returned from a stored procedure.

console.log(result[0]);

would output "[ RowDataPacket { datetime: '2019-11-15 16:37:05' } ]".

I found that

console.log(results[0][0].datetime);

Gave me the value I wanted.

Answer 3

Turns out they are normal objects and you can access them through user_id.

RowDataPacket is actually the name of the constructor function that creates an object, it would look like this new RowDataPacket(user_id, ...). You can check by accessing its name [0].constructor.name

If the result is an array, you would have to use [0].user_id.

Answer 4

Solution

Just do: JSON.stringify(results)

Answer 5

I also met the same problem recently, when I use waterline in express project for complex queries ,use the SQL statement to query.

this is my solution: first transform the return value(RowDataPacket object) into string, and then convert this string into the json object.

The following is code :

//select all user (查询全部用户)
find: function(req, res, next){
    console.log("i am in user find list");
    var sql="select * from tb_user";

    req.models.tb_user.query(sql,function(err, results) {
        console.log('>> results: ', results );
        var string=JSON.stringify(results);
        console.log('>> string: ', string );
        var json =  JSON.parse(string);
        console.log('>> json: ', json);
        console.log('>> user.name: ', json[0].name);
        req.list = json;
        next();
    });
}

The following is console:

    >> results:  [ RowDataPacket {
    user_id: '2fc48bd0-a62c-11e5-9a32-a31e4e4cd6a5',
    name: 'wuwanyu',
    psw: '123',
    school: 'Northeastern university',                                                                                                                                           
    major: 'Communication engineering',                                                                                                                                            
    points: '10',
    datems: '1450514441486',
    createdAt: Sat Dec 19 2015 16:42:31 GMT+0800 (中国标准时间),                                                                                                  
    updatedAt: Sat Dec 19 2015 16:42:31 GMT+0800 (中国标准时间),                                                                                                  
    ID: 3,
    phone: 2147483647 } ]
>> string:  [{"user_id":"2fc48bd0-a62c-11e5-9a32-a31e4e4cd6a5","name":"wuwanyu","psw":"123","school":"Northeastern university","major":"Communication engineering","points":"10","datems":"1450514
441486","createdAt":"2015-12-19T08:42:31.000Z","updatedAt":"2015-12-19T08:42:31.000Z","ID":3,"phone":2147483647}]
>> json:  [ { user_id: '2fc48bd0-a62c-11e5-9a32-a31e4e4cd6a5',
    name: 'wuwanyu',
    psw: '123',
    school: 'Northeastern university',                                                                                                                                           
    major: 'Communication engineering',                                                                                                                                            
    points: '10',
    datems: '1450514441486',
    createdAt: '2015-12-19T08:42:31.000Z',
    updatedAt: '2015-12-19T08:42:31.000Z',
    ID: 3,
    phone: 2147483647 } ]
>> user.name:  wuwanyu

Answer 6

You can copy all enumerable own properties of an object to a new one by Object.assign(target, ...sources):

trivial_object = Object.assign({}, non_trivial_object);

so in your scenario, it should be enough to change

ret.push(i);

to

ret.push(Object.assign({}, i));