forked from snowflakedb/gosnowflake
-
Notifications
You must be signed in to change notification settings - Fork 2
/
multistatement.go
120 lines (99 loc) · 3.14 KB
/
multistatement.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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
package main
import (
"context"
"database/sql"
"flag"
"fmt"
"log"
"time"
sf "github.com/observeinc/gosnowflake"
)
func main() {
if !flag.Parsed() {
flag.Parse()
}
cfg, err := sf.GetConfigFromEnv([]*sf.ConfigParam{
{Name: "Account", EnvName: "SNOWFLAKE_TEST_ACCOUNT", FailOnMissing: true},
{Name: "User", EnvName: "SNOWFLAKE_TEST_USER", FailOnMissing: true},
{Name: "Password", EnvName: "SNOWFLAKE_TEST_PASSWORD", FailOnMissing: true},
{Name: "Host", EnvName: "SNOWFLAKE_TEST_HOST", FailOnMissing: false},
{Name: "Port", EnvName: "SNOWFLAKE_TEST_PORT", FailOnMissing: false},
{Name: "Protocol", EnvName: "SNOWFLAKE_TEST_PROTOCOL", FailOnMissing: false},
{Name: "Database", EnvName: "SNOWFLAKE_TEST_DATABASE", FailOnMissing: true},
{Name: "Schema", EnvName: "SNOWFLAKE_TEST_SCHEMA", FailOnMissing: true},
})
if err != nil {
log.Fatalf("failed to create Config, err: %v", err)
}
dsn, err := sf.DSN(cfg)
if err != nil {
log.Fatalf("Failed to create DSN from config: %v, error: %v", cfg, err)
}
db, err := sql.Open("snowflake", dsn)
if err != nil {
log.Fatalf("Failed to connect, dsn: %v, error: %v", dsn, err)
}
defer db.Close()
printSelectDemo(db)
printModifyingDemo(db)
}
func printSelectDemo(db *sql.DB) {
fmt.Println("SELECTs only")
numberOfQueries := 2
query := `
WITH table1 AS (SELECT 'table 1, row 1', 11 UNION SELECT 'table 1, row 2', 12)
SELECT * FROM table1;
WITH table2 AS (SELECT 'table 2, row 1', 21 UNION SELECT 'table 2, row 2', 22)
SELECT * FROM table2;
`
fmt.Println(query)
context := createMultistatementContext(numberOfQueries)
result, err := db.QueryContext(context, query)
if err != nil {
log.Fatalf("Error while querying snowflake: %v", err)
}
defer result.Close()
for hasNextResultSet := true; hasNextResultSet; hasNextResultSet = result.NextResultSet() {
for result.Next() {
var str string
var int int
err := result.Scan(&str, &int)
if err != nil {
log.Fatalf("Error while scanning row: %v", err)
}
fmt.Println(str, " | ", int)
}
}
if result.Err() != nil {
log.Fatalf("Error while reading results: %v", err)
}
}
func printModifyingDemo(db *sql.DB) {
fmt.Println("Modifications only")
numberOfQueries := 4
tableSuffix := time.Now().UnixMilli()
query := fmt.Sprintf(`
CREATE TABLE multistatement_test_%d (id integer);
INSERT INTO multistatement_test_%d VALUES (1);
INSERT INTO multistatement_test_%d VALUES (2), (3);
DROP TABLE multistatement_test_%d
`, tableSuffix, tableSuffix, tableSuffix, tableSuffix)
fmt.Println(query)
context := createMultistatementContext(numberOfQueries)
result, err := db.ExecContext(context, query)
if err != nil {
log.Fatalf("Error while querying snowflake: %v", err)
}
rowsAffected, err := result.RowsAffected()
if err != nil {
log.Fatalf("Error while reading rows affected: %v", rowsAffected)
}
fmt.Printf("Rows affected: %d, expected: %d\n", rowsAffected, 3)
}
func createMultistatementContext(numberOfQueries int) context.Context {
context, err := sf.WithMultiStatement(context.Background(), numberOfQueries)
if err != nil {
log.Fatalf("Error while creating multi statement context: %v", err)
}
return context
}