Dumping MySQL tables to JSON with Golang

Question

Was putting together a quick dumper for MySQL to JSON in Go. However I find that everything that I retrieve from the database is a []byte array. Thus instead of n

Answer 1

There's not much you can do because the driver - database/sql interaction is pretty much a one way street and the driver can't help you with anything when the data is handed over to database/sql.

You could try your luck with http://godoc.org/github.com/arnehormann/sqlinternals/mysqlinternals

• Query the database
• Retrieve the Column slice with cols, err := mysqlinternals.Columns(rows)
• Create a new var values := make([]interface{}, len(cols)) and iterate over cols
• Get the closest matching Go type per column with refType, err := cols[i].ReflectGoType()
• Create type placeholders with values[i] = reflect.Zero(refType).Interface()
• rows.Next() and err = rows.Scan(values...). Don't recreate values, copy and reuse it.

I guess this will still be pretty slow, but you should be able to get somewhere with it. If you encounter problems, please file an issue - I'll get to it as soon as I can.