mirror of
https://github.com/uptrace/go-clickhouse.git
synced 2025-06-10 23:27:25 +02:00
120 lines
4.2 KiB
Markdown
120 lines
4.2 KiB
Markdown
# ClickHouse client for Go 1.18+
|
|
|
|
[](https://github.com/uptrace/go-clickhouse/actions)
|
|
[](https://pkg.go.dev/github.com/go-clickhouse/ch)
|
|
[](https://clickhouse.uptrace.dev/)
|
|
[](https://discord.gg/rWtp5Aj)
|
|
|
|
This ClickHouse client uses native protocol to communicate with ClickHouse server and requires Go
|
|
1.18+ in order to use generics. This is not a database/sql driver, but the API is compatible.
|
|
|
|
Main features are:
|
|
|
|
- ClickHouse native protocol support and efficient column-oriented design.
|
|
- API compatible with database/sql.
|
|
- [Bun](https://github.com/uptrace/bun/)-like query builder.
|
|
- [Selecting](https://clickhouse.uptrace.dev/guide/clickhouse-select.html) into scalars, structs,
|
|
maps, slices of maps/structs/scalars.
|
|
- `Date`, `DateTime`, and `DateTime64`.
|
|
- `Array(T)` including nested arrays.
|
|
- Enums and `LowCardinality(String)`.
|
|
- `Nullable(T)` except `Nullable(Array(T))`.
|
|
- [Migrations](https://clickhouse.uptrace.dev/guide/clickhouse-migrations.html).
|
|
- [OpenTelemetry](https://clickhouse.uptrace.dev/guide/clickhouse-monitoring-performance.html)
|
|
support.
|
|
- In production at [Uptrace](https://github.com/uptrace/uptrace)
|
|
|
|
Resources:
|
|
|
|
- [**Get started**](https://clickhouse.uptrace.dev/guide/getting-started.html)
|
|
- [Examples](https://github.com/uptrace/go-clickhouse/tree/master/example)
|
|
- [Discussions](https://github.com/uptrace/go-clickhouse/discussions)
|
|
- [Chat](https://discord.gg/rWtp5Aj)
|
|
- [Reference](https://pkg.go.dev/github.com/uptrace/go-clickhouse/ch)
|
|
- [Example app](https://github.com/uptrace/uptrace)
|
|
|
|
## Benchmark
|
|
|
|
**Read** (best of 3 runs):
|
|
|
|
| Library | Timing |
|
|
| ------------------------------------------------------------------------------------------------------------------ | ------ |
|
|
| [This library](example/benchmark/read-native/main.go) | 655ms |
|
|
| [ClickHouse/clickhouse-go](https://github.com/ClickHouse/clickhouse-go/blob/main/benchmark/v2/read-native/main.go) | 849ms |
|
|
|
|
**Write** (best of 3 runs):
|
|
|
|
| Library | Timing |
|
|
| ---------------------------------------------------------------------------------------------------------------------------- | ------ |
|
|
| [This library](example/benchmark/write-native-columnar/main.go) | 475ms |
|
|
| [ClickHouse/clickhouse-go](https://github.com/ClickHouse/clickhouse-go/blob/main/benchmark/v2/write-native-columnar/main.go) | 881ms |
|
|
|
|
## Installation
|
|
|
|
```shell
|
|
go get github.com/uptrace/go-clickhouse@latest
|
|
```
|
|
|
|
## Example
|
|
|
|
A [basic](example/basic) example:
|
|
|
|
```go
|
|
package main
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"time"
|
|
|
|
"github.com/uptrace/go-clickhouse/ch"
|
|
"github.com/uptrace/go-clickhouse/chdebug"
|
|
)
|
|
|
|
type Model struct {
|
|
ch.CHModel `ch:"partition:toYYYYMM(time)"`
|
|
|
|
ID uint64
|
|
Text string `ch:",lc"`
|
|
Time time.Time `ch:",pk"`
|
|
}
|
|
|
|
func main() {
|
|
ctx := context.Background()
|
|
|
|
db := ch.Connect(ch.WithDatabase("test"))
|
|
db.AddQueryHook(chdebug.NewQueryHook(chdebug.WithVerbose(true)))
|
|
|
|
if err := db.Ping(ctx); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
var num int
|
|
if err := db.QueryRowContext(ctx, "SELECT 123").Scan(&num); err != nil {
|
|
panic(err)
|
|
}
|
|
fmt.Println(num)
|
|
|
|
if err := db.ResetModel(ctx, (*Model)(nil)); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
src := &Model{ID: 1, Text: "hello", Time: time.Now()}
|
|
if _, err := db.NewInsert().Model(src).Exec(ctx); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
dest := new(Model)
|
|
if err := db.NewSelect().Model(dest).Where("id = ?", src.ID).Limit(1).Scan(ctx); err != nil {
|
|
panic(err)
|
|
}
|
|
fmt.Println(dest)
|
|
}
|
|
```
|
|
|
|
## See also
|
|
|
|
- [Golang ORM](https://github.com/uptrace/bun) for PostgreSQL, MySQL, MSSQL, and SQLite
|
|
- [Golang PostgreSQL](https://bun.uptrace.dev/postgres/)
|
|
- [Golang HTTP router](https://github.com/uptrace/bunrouter)
|