How Do I Access Data from RowDataPacket Objects in Node-webkit and MySQL?

Unveiling the Mystery of RowDataPacket Object Access

When working with Node-webkit and MySQL, extracting data from database queries can seem like a riddle. One of the puzzles you may encounter is accessing the results of your query, which are often stored in a RowDataPacket object.

In your code, you've stored the results in an ret array after using the query() method:

var ret = [];
conn.query(SQLquery, function(err, rows, fields) {
    if (err)
        alert("...");
    else {
        for (var i of rows) 
            ret.push(i);
    }
    doStuffwithTheResult(ret);
});

To your surprise, when you try to work with the results in the doStuffwithTheResult function, you wonder how to extract the data.

Unraveling this mystery involves understanding the nature of RowDataPacket objects. Contrary to its name, RowDataPacket is not a packet but a constructor function that creates objects. Each object contains key-value pairs that represent a row in your database table. You can access these values using dot notation.

For instance, if you want to retrieve the user_id from the first result, you would use ret[0].user_id. To obtain both the key and value, you can do ret[0].user_id or ret[0]['user_id'].

Remember that RowDataPacket objects are normal objects. You can verify this by checking their constructor name: [0].constructor.name. This will reveal that the object is an instance of RowDataPacket.

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