How to insert csv file using one command in clickhouse using golang - csv

Question

Is there a way to insert csv file using this go library https://github.com/ClickHouse/clickhouse-go in one command (without reading csv and iterating through the content.). If there is a way can you provide me with the example.
if not how can we convert this system command and write it in golang using os/exec library.
cat /home/srijan/employee.csv | clickhouse-client --query="INSERT INTO test1 FORMAT CSV"

Answer 1

It's impossible with that go library. You can use http api https://clickhouse.com/docs/en/interfaces/http/ and any http go client
for example
package main
import (
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
)
func compress(data io.Reader) io.Reader {
pr, pw := io.Pipe()
gw, err := gzip.NewWriterLevel(pw, int(3))
if err != nil {
panic(err)
}
go func() {
_, _ = io.Copy(gw, data)
gw.Close()
pw.Close()
}()
return pr
}
func main() {
p, err := url.Parse("http://localhost:8123/")
if err != nil {
panic(err)
}
q := p.Query()
q.Set("query", "INSERT INTO test1 FORMAT CSV")
p.RawQuery = q.Encode()
queryUrl := p.String()
var req *http.Request
req, err = http.NewRequest("POST", queryUrl, compress(os.Stdin))
req.Header.Add("Content-Encoding", "gzip")
if err != nil {
panic(err)
}
client := &http.Client{
Transport: &http.Transport{DisableKeepAlives: true},
}
resp, err := client.Do(req)
if err != nil {
panic(err)
}
defer resp.Body.Close()
body, _ := ioutil.ReadAll(resp.Body)
if resp.StatusCode != 200 {
panic(fmt.Errorf("clickhouse response status %d: %s", resp.StatusCode, string(body)))
}
}