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Showing content from https://pkg.go.dev/github.com/GreptimeTeam/greptimedb-ingester-go below:

greptime package - github.com/GreptimeTeam/greptimedb-ingester-go - Go Packages

Provide API to insert data into GreptimeDB.

go get -u github.com/GreptimeTeam/greptimedb-ingester-go

import greptime "github.com/GreptimeTeam/greptimedb-ingester-go"

Initiate a Config for Client

cfg := greptime.NewConfig("<host>").
    WithPort(4001).
    WithAuth("<username>", "<password>").
    WithDatabase("<database>")

Secure

cfg.WithInsecure(false) // default insecure=true

keepalive

cfg.WithKeepalive(time.Second*30, time.Second*5) // keepalive isn't enabled by default

c, err := greptime.NewClient(cfg)
...
defer c.client.Close()

• you can Insert data into GreptimeDB via different style:

  • Table style
  • ORM style

• streaming insert is to Send data into GreptimeDB without waiting for response.

you can define schema via Table and Column, and then AddRow to include the real data you want to write.

define table schema, and add rows

import(
    "github.com/GreptimeTeam/greptimedb-ingester-go/table"
    "github.com/GreptimeTeam/greptimedb-ingester-go/table/types"
)

tbl, err := table.New("<table_name>")

tbl.AddTagColumn("id", types.INT64)
tbl.AddFieldColumn("host", types.STRING)
tbl.AddTimestampColumn("ts", types.TIMESTAMP_MILLISECOND)

err := tbl.AddRow(1, "127.0.0.1", time.Now())
err := tbl.AddRow(2, "127.0.0.2", time.Now())
...

Write into GreptimeDB

resp, err := c.Write(context.Background(), tbl)

Delete from GreptimeDB

dtbl, err := table.New("<table_name>")
dtbl.AddTagColumn("id", types.INT64)
dtbl.AddTimestampColumn("ts", types.TIMESTAMP_MILLISECOND)

// timestamp is the time you want to delete row
err := dtbl.AddRow(1, "127.0.0.1",timestamp)

affected, err := c.Delete(context.Background(),dtbl)

Stream Write into GreptimeDB

err := c.StreamWrite(context.Background(), tbl)
...
affected, err := c.CloseStream(ctx)

Stream Delete from GreptimeDB

err := c.StreamDelete(context.Background(), tbl)
...
affected, err := c.CloseStream(ctx)

If you prefer ORM style, and define column-field relationship via struct field tag, you can try the following way.

Tag

• greptime is the struct tag key
• tag, field, timestamp is for SemanticType, and the value is ignored
• column is to define the column name
• type is to define the data type. if type is timestamp, precision is supported
• the metadata separator is ; and the key value separator is :

type supported is the same as described Datatypes supported, and case insensitive.

When fields marked with greptime:"-", writing field will be ignored.

define struct with tags

type Monitor struct {
    ID          int64     `greptime:"tag;column:id;type:int64"`
    Host        string    `greptime:"field;column:host;type:string"`
    Ts          time.Time `greptime:"timestamp;column:ts;type:timestamp;precision:millisecond"`
}

// TableName is to define the table name.
func (Monitor) TableName() string {
    return "<table_name>"
}

instance your struct

monitors := []Monitor{
    {
        ID:          randomId(),
        Host:        "127.0.0.1",
        Running:     true,
    },
    {
        ID:          randomId(),
        Host:        "127.0.0.2",
        Running:     true,
    },
}

WriteObject into GreptimeDB

resp, err := c.WriteObject(context.Background(), monitors)

DeleteObject in GreptimeDB

deleteMonitors := monitors[:1]

affected, err := c.DeleteObject(context.Background(), deleteMonitors)

Stream WriteObject into GreptimeDB

err := c.StreamWriteObject(context.Background(), monitors)
...
affected, err := c.CloseStream(ctx)

Stream DeleteObject in GreptimeDB

deleteMonitors := monitors[:1]

err := c.StreamDeleteObject(context.Background(), deleteMonitors)
...
affected, err := c.CloseStream(ctx)

The GreptimeDB column is for the datatypes supported in library, and the Go column is the matched Go type.

NOTE: Int is for all of Integer and Unsigned Integer in Go

You can use ORM library like gorm with MySQL or PostgreSQL driver to connect GreptimeDB and retrieve data from it.

type Monitor struct {
    ID          int64     `gorm:"primaryKey;column:id"`
    Host        string    `gorm:"column:host"`
    Ts          time.Time `gorm:"column:ts"`
}

// Get all monitors
var monitors []Monitor
result := db.Find(&monitors)

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