Golang implements the method of outputting SQL result set in json format

func getJSON(sqlString string) (string, error) {
    stmt, err := (sqlString)
    if err != nil {
        return nil, err
    }
    defer ()
    rows, err := ()
    if err != nil {
        return nil, err
    }
    defer ()
    columns, err := ()
    if err != nil {
      return "", err
    }
    count := len(columns)
    tableData := make([]map[string]interface{}, 0)
    values := make([]interface{}, count)
    valuePtrs := make([]interface{}, count)
    for () {
      for i := 0; i < count; i++ {
          valuePtrs[i] = &values[i]
      }
      (valuePtrs...)
      entry := make(map[string]interface{})
      for i, col := range columns {
          var v interface{}
          val := values[i]
          b, ok := val.([]byte)
          if ok {
              v = string(b)
          } else {
              v = val
          }
          entry[col] = v
      }
      tableData = append(tableData, entry)
    }
    jsonData, err := (tableData)
    if err != nil {
      return "", err
    }
    (string(jsonData))
    return string(jsonData), nil
}