batch.go

// Licensed to ClickHouse, Inc. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. ClickHouse, Inc. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package clickhouse_api

import (
	"context"
	"github.com/google/uuid"
	"time"
)

func BatchInsert() error {
	conn, err := GetNativeConnection(nil, nil, nil)
	if err != nil {
		return err
	}
	ctx := context.Background()
	defer func() {
		conn.Exec(ctx, "DROP TABLE example")
	}()
	conn.Exec(context.Background(), "DROP TABLE IF EXISTS example")
	err = conn.Exec(ctx, `
		CREATE TABLE IF NOT EXISTS example (
			  Col1 UInt8
			, Col2 String
			, Col3 FixedString(3)
			, Col4 UUID
			, Col5 Map(String, UInt8)
			, Col6 Array(String)
			, Col7 Tuple(String, UInt8, Array(Map(String, String)))
			, Col8 DateTime
		) Engine = Memory
	`)
	if err != nil {
		return err
	}

	batch, err := conn.PrepareBatch(ctx, "INSERT INTO example")
	if err != nil {
		return err
	}
	for i := 0; i < 1000; i++ {
		err := batch.Append(
			uint8(42),
			"ClickHouse",
			"Inc",
			uuid.New(),
			map[string]uint8{"key": 1},             // Map(String, UInt8)
			[]string{"Q", "W", "E", "R", "T", "Y"}, // Array(String)
			[]any{ // Tuple(String, UInt8, Array(Map(String, String)))
				"String Value", uint8(5), []map[string]string{
					{"key": "value"},
					{"key": "value"},
					{"key": "value"},
				},
			},
			time.Now(),
		)
		if err != nil {
			return err
		}
	}
	return batch.Send()
}