Created
March 14, 2019 17:46
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simple snowflake database query from Go and return results as JSON
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package main | |
import ( | |
"database/sql" | |
"encoding/json" | |
"log" | |
"reflect" | |
"time" | |
sf "github.com/snowflakedb/gosnowflake" | |
"fmt" | |
) | |
var ( | |
sfClient *sql.DB | |
) | |
type Config struct { | |
Account string | |
Region string | |
Warehouse string | |
Database string | |
Username string | |
Password string | |
} | |
func NewSnowflakeConnection(config Config) *sql.DB { | |
configStr, err := sf.DSN(&sf.Config{ | |
Region: config.Region, | |
Account: config.Account, | |
User: config.Username, | |
Password: config.Password, | |
Database: config.Database, | |
Warehouse: config.Warehouse, | |
LoginTimeout: 5 * time.Second, | |
}) | |
if err != nil { | |
log.Fatal(err) | |
} | |
db, err := sql.Open("snowflake", configStr) | |
if err != nil { | |
log.Fatal(err) | |
} | |
return db | |
} | |
func ResultsToJSON(rows *sql.Rows) ([]byte, error) { | |
var objects []map[string]interface{} | |
for rows.Next() { | |
columns, err := rows.ColumnTypes() | |
if err != nil { | |
return nil, err | |
} | |
// Scan needs an array of pointers to the values it is setting | |
// This creates the object and sets the values correctly | |
values := make([]interface{}, len(columns)) | |
object := map[string]interface{}{} | |
for i, column := range columns { | |
object[column.Name()] = reflect.New(column.ScanType()).Interface() | |
values[i] = object[column.Name()] | |
} | |
err = rows.Scan(values...) | |
if err != nil { | |
return nil, err | |
} | |
objects = append(objects, object) | |
} | |
return json.Marshal(objects) | |
} | |
func main() { | |
sfClient = NewSnowflakeConnection(Config{ | |
Account: "account_name", | |
Region: "us-east-1", | |
Username: "user", | |
Password: "password", | |
Database: "databots", | |
Warehouse: "demo_warehouse", | |
}) | |
defer sfClient.Close() | |
err := sfClient.Ping() | |
if err != nil { | |
log.Fatal("Snowflake Connection not available") | |
return | |
} | |
rows, err := sfClient.Query("select * from TABLE_NM limit 10") | |
defer rows.Close() | |
if err != nil { | |
log.Fatal("ERROR: %s.", err) | |
} | |
b, err := ResultsToJSON(rows) | |
if err != nil { | |
log.Fatal("ERROR: %s.", err) | |
} | |
fmt.Println(string(b)) | |
} |
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