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

you can dump the table into json just fine, however everything will be string :(

q := "select * from table"
debug("SQL: %s", q)

rows, err := db.Query(q)
checkError(err)
defer rows.Close()

columns, err := rows.Columns()
checkError(err)

scanArgs := make([]interface{}, len(columns))
values := make([]interface{}, len(columns))

for i := range values {
    scanArgs[i] = &values[i]
}

for rows.Next() {
    err = rows.Scan(scanArgs...)
    checkError(err)

    record := make(map[string]interface{})

    for i, col := range values {
        if col != nil {
            record[columns[i]] = fmt.Sprintf("%s", string(col.([]byte)))
        }
    }

    s, _ := json.Marshal(record)
    fmt.Printf("%s\n", s)
}