forked from ClickHouse/clickhouse-go
-
Notifications
You must be signed in to change notification settings - Fork 0
/
main.go
101 lines (96 loc) · 2.24 KB
/
main.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
// 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 main
import (
"database/sql"
"fmt"
"log"
"time"
_ "github.com/ClickHouse/clickhouse-go/v2"
)
func example() error {
conn, err := sql.Open("clickhouse", "clickhouse://127.0.0.1:9000")
if err != nil {
return err
}
const ddl = `
CREATE TABLE example (
Col1 UInt8
, Col2 String
, Col3 DateTime
) ENGINE = Memory
`
if _, err := conn.Exec(`DROP TABLE IF EXISTS example`); err != nil {
return err
}
if _, err := conn.Exec(ddl); err != nil {
return err
}
datetime := time.Now()
{
scope, err := conn.Begin()
if err != nil {
return err
}
batch, err := scope.Prepare("INSERT INTO example")
if err != nil {
return err
}
for i := 0; i < 10; i++ {
if _, err := batch.Exec(uint8(i), "ClickHouse Inc.", datetime); err != nil {
return err
}
}
if err := scope.Commit(); err != nil {
return err
}
}
var result struct {
Col1 uint8
Col2 string
Col3 time.Time
}
{
if err := conn.QueryRow(`SELECT * FROM example WHERE Col1 = $1 AND Col3 = $2`, 2, datetime).Scan(
&result.Col1,
&result.Col2,
&result.Col3,
); err != nil {
return err
}
fmt.Println(result)
}
{
if err := conn.QueryRow(`SELECT * FROM example WHERE Col1 = @Col1 AND Col3 = @Col2`,
sql.Named("Col1", 4),
sql.Named("Col2", datetime),
).Scan(
&result.Col1,
&result.Col2,
&result.Col3,
); err != nil {
return err
}
fmt.Println(result)
}
return nil
}
func main() {
if err := example(); err != nil {
log.Fatal(err)
}
}