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nested.go
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nested.go
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// 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"
"fmt"
"github.com/Perseus/clickhouse-go/v2"
"strconv"
)
func NestedUnFlattened() error {
conn, err := GetNativeConnection(clickhouse.Settings{
"flatten_nested": 0,
}, 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 example (
Col1 Nested(Col1_1 String, Col1_2 UInt8),
Col2 Nested(
Col2_1 UInt8,
Col2_2 Nested(
Col2_2_1 UInt8,
Col2_2_2 UInt8
)
)
) Engine Memory
`)
if err != nil {
return err
}
batch, err := conn.PrepareBatch(ctx, "INSERT INTO example")
if err != nil {
return err
}
var i int64
for i = 0; i < 10; i++ {
err := batch.Append(
[]map[string]any{
{
"Col1_1": strconv.Itoa(int(i)),
"Col1_2": uint8(i),
},
{
"Col1_1": strconv.Itoa(int(i + 1)),
"Col1_2": uint8(i + 1),
},
{
"Col1_1": strconv.Itoa(int(i + 2)),
"Col1_2": uint8(i + 2),
},
},
[]map[string]any{
{
"Col2_2": []map[string]any{
{
"Col2_2_1": uint8(i),
"Col2_2_2": uint8(i + 1),
},
},
"Col2_1": uint8(i),
},
{
"Col2_2": []map[string]any{
{
"Col2_2_1": uint8(i + 2),
"Col2_2_2": uint8(i + 3),
},
},
"Col2_1": uint8(i + 1),
},
},
)
if err != nil {
return err
}
}
if err := batch.Send(); err != nil {
return err
}
var (
col1 []map[string]any
col2 []map[string]any
)
rows, err := conn.Query(ctx, "SELECT * FROM example")
if err != nil {
return err
}
for rows.Next() {
if err := rows.Scan(&col1, &col2); err != nil {
return err
}
fmt.Printf("row: col1=%v, col2=%v\n", col1, col2)
}
rows.Close()
return rows.Err()
}
func NestedFlattened() 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(ctx, "DROP TABLE IF EXISTS example")
err = conn.Exec(ctx, `
CREATE TABLE example (
Col1 Nested(Col1_1 String, Col1_2 UInt8),
Col2 Nested(
Col2_1 UInt8,
Col2_2 Nested(
Col2_2_1 UInt8,
Col2_2_2 UInt8
)
)
) Engine Memory
`)
if err != nil {
return err
}
batch, err := conn.PrepareBatch(ctx, "INSERT INTO example")
if err != nil {
return err
}
var i uint8
for i = 0; i < 10; i++ {
col1_1_data := []string{strconv.Itoa(int(i)), strconv.Itoa(int(i + 1)), strconv.Itoa(int(i + 2))}
col1_2_data := []uint8{i, i + 1, i + 2}
col2_1_data := []uint8{i, i + 1, i + 2}
col2_2_data := [][][]any{
{
{i, i + 1},
},
{
{i + 2, i + 3},
},
{
{i + 4, i + 5},
},
}
err := batch.Append(
col1_1_data,
col1_2_data,
col2_1_data,
col2_2_data,
)
if err != nil {
return err
}
}
if err := batch.Send(); err != nil {
return err
}
return nil
}