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main.go
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main.go
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package main
import (
"database/sql"
"fmt"
"log"
"net/http"
_ "net/http/pprof"
"time"
"github.com/ClickHouse/clickhouse-go/v2"
)
var conn *sql.DB
func main() {
go func() {
http.ListenAndServe("127.0.0.1:9876", nil)
}()
var err error
conn, err = sql.Open("clickhouse", "tcp://127.0.0.1:9000?debug=false")
if err != nil {
log.Fatal(err)
}
conn.SetMaxOpenConns(5)
conn.SetMaxIdleConns(1)
conn.SetConnMaxLifetime(15 * time.Minute)
if err := conn.Ping(); err != nil {
if exception, ok := err.(*clickhouse.Exception); ok {
fmt.Printf("[%d] %s \n%s\n", exception.Code, exception.Message, exception.StackTrace)
} else {
fmt.Println(err)
}
return
}
conn.Exec("DROP TABLE IF EXISTS example")
_, err = conn.Exec(`
CREATE TABLE IF NOT EXISTS example (
country_code FixedString(2),
os_id UInt8,
browser_id UInt8,
categories Array(Int16),
action_day Date,
action_time DateTime
) engine=Memory
`)
if err != nil {
log.Fatal(err)
}
for range time.Tick(time.Second) {
log.Println("time", time.Now())
//go testInsert()
//go testQuery()
testQuery()
}
if _, err := conn.Exec("DROP TABLE example"); err != nil {
log.Fatal(err)
}
}
func testInsert() {
var (
tx, _ = conn.Begin()
stmt, _ = tx.Prepare("INSERT INTO example (country_code, os_id, browser_id, action_day, action_time) VALUES (?, ?, ?, ?, ?)")
)
defer stmt.Close()
for i := 0; i < 100; i++ {
if _, err := stmt.Exec(
"RU",
10+i,
100+i,
time.Now(),
time.Now(),
); err != nil {
log.Fatal(err)
}
}
if err := tx.Commit(); err != nil {
log.Fatal(err)
}
}
func testQuery() {
rows, err := conn.Query("SELECT country_code, os_id, browser_id, categories, action_day, action_time FROM example")
if err != nil {
log.Fatal(err)
}
defer rows.Close()
var (
country string
os, browser uint8
categories []int16
actionDay, actionTime time.Time
)
for rows.Next() {
if err := rows.Scan(&country, &os, &browser, &categories, &actionDay, &actionTime); err != nil {
log.Fatal(err)
}
//log.Printf("country: %s, os: %d, browser: %d, categories: %v, action_day: %s, action_time: %s", country, os, browser, categories, actionDay, actionTime)
}
if err := rows.Err(); err != nil {
log.Fatal(err)
}
}