This library is compatible with Go 1.17+
Please refer to CHANGELOG.md if you encounter breaking changes.
This library provides fast implementation of the BigQuery Client as a database/sql drvier.
The BigQuery driver accepts the following DSN
-
'bigquery://projectID/[location/]datasetID?queryString'
Where queryString can optionally configure the following option:
- credentialsFile
- credentialJSON (with url-base64 encoded json)
- endpoint
- userAgent
- apiKey
- quotaProject
- scopes
Since this library uses Google Cloud API you can pass your credentials via GOOGLE_APPLICATION_CREDENTIALS environment variable.
package main
import (
"database/sql"
"fmt"
"context"
"log"
_ "github.com/flarco/bigquery"
)
type Participant struct {
Name string
Splits []float64
}
func main() {
db, err := sql.Open("bigquery", "bigquery://myProjectID/mydatasetID")
if err != nil {
log.Fatal(err)
}
defer db.Close()
SQL := `WITH races AS (
SELECT "800M" AS race,
[STRUCT("Ben" as name, [23.4, 26.3] as splits),
STRUCT("Frank" as name, [23.4, 26.3] as splits)
]
AS participants)
SELECT
race,
participant
FROM races r
CROSS JOIN UNNEST(r.participants) as participant`
rows, err := db.QueryContext(context.Background(), SQL)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
for rows.Next() {
if err := rows.Err(); err != nil {
log.Fatal(err)
}
var race string
var participant Participant
err = rows.Scan(&race, &participant)
fmt.Printf("fetched: %v %+v\n", race, participant)
if err != nil {
log.Fatal(err)
}
}
}Benchmark runs 3 times the following queries:
- primitive types:
SELECT state,gender,year,name,number
FROM `bigquery-public-data.usa_names.usa_1910_2013` LIMIT 10000- complex type (repeated string/repeated record)
SELECT t.publication_number, t.inventor, t.assignee, t.description_localized
FROM `patents-public-data.patents.publications_202105` t ORDER BY 1 LIMIT 1000In both case database/sql driver is faster and allocate way less memory than GCP BigQuery API Client
goos: darwin
goarch: amd64
pkg: github.com/flarco/bigquery/bench
cpu: Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz
Benchmark_Primitive_GCPClient
database/gcp: primitive types 3.918388531s
Benchmark_Primitive_GCPClient-16 1 3918442974 ns/op 42145144 B/op 830647 allocs/op
Benchmark_Primitive_SQLDriver
database/sql: primitive types 2.880091637s
Benchmark_Primitive_SQLDriver-16 1 2880149491 ns/op 22301848 B/op 334547 allocs/op
Benchmark_Complex_GCPClient
database/gcp: structured types 3.303497894s
Benchmark_Complex_GCPClient-16 1 3303548761 ns/op 11551216 B/op 154660 allocs/op
Benchmark_Complex_SQLDriver
database/sql: structured types 2.690012577s
Benchmark_Complex_SQLDriver-16 1 2690056675 ns/op 6643176 B/op 71562 allocs/op
PASSThe source code is made available under the terms of the Apache License, Version 2, as stated in the file LICENSE.
Individual files may be made available under their own specific license, all compatible with Apache License, Version 2. Please see individual files for details.
Library Author: Adrian Witas