How Do I Access Data and Column Names from a Node-webkit RowDataPacket Object?

Accessing Data from a RowDataPacket Object

In Node-webkit, when querying a MySQL database, you may encounter instances where the results are stored in a RowDataPacket object. This article explains how to access and retrieve data from this object.

Background

As mentioned in the question, the RowDataPacket object is typically returned as an array of objects:

RowDataPacket {user_id: 101, ActionsPerformed: 20}
RowDataPacket {user_id: 102, ActionsPerformed: 110}
RowDataPacket {user_id: 104, ActionsPerformed: 3}

Each object within the array represents a row of data from the database. The object keys correspond to column names, while the values match the data within those columns.

Retrieving Data from the RowDataPacket

The key insight is that RowDataPacket is simply a constructor function that creates normal objects. You can access the object's properties using dot notation. For example, to retrieve the user_id value from the first result, you would use:

row[0].user_id

where row is the array containing the RowDataPacket objects.

Retrieving Object Keys (Column Names)

The RowDataPacket constructor does not expose a direct way to retrieve the object keys (column names). However, you can access them using the following approach:

const keys = Object.keys(row[0]);

This will return an array of strings containing the column names.

Example

Combining the above techniques, you can retrieve both the values and keys from the RowDataPacket object as follows:

for (const row of data) {
  const user_id = row.user_id;
  const actionsPerformed = row.ActionsPerformed;
  const keys = Object.keys(row);
}

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