restic/vendor/cloud.google.com/go/bigquery/examples_test.go

830 lines
20 KiB
Go

// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed 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 bigquery_test
import (
"fmt"
"os"
"time"
"cloud.google.com/go/bigquery"
"golang.org/x/net/context"
"google.golang.org/api/iterator"
)
func ExampleNewClient() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
_ = client // TODO: Use client.
}
func ExampleClient_Dataset() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.Dataset("my_dataset")
fmt.Println(ds)
}
func ExampleClient_DatasetInProject() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.DatasetInProject("their-project-id", "their-dataset")
fmt.Println(ds)
}
func ExampleClient_Datasets() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.Datasets(ctx)
_ = it // TODO: iterate using Next or iterator.Pager.
}
func ExampleClient_DatasetsInProject() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.DatasetsInProject(ctx, "their-project-id")
_ = it // TODO: iterate using Next or iterator.Pager.
}
func getJobID() string { return "" }
func ExampleClient_JobFromID() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
jobID := getJobID() // Get a job ID using Job.ID, the console or elsewhere.
job, err := client.JobFromID(ctx, jobID)
if err != nil {
// TODO: Handle error.
}
fmt.Println(job.LastStatus()) // Display the job's status.
}
func ExampleClient_Jobs() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.Jobs(ctx)
it.State = bigquery.Running // list only running jobs.
_ = it // TODO: iterate using Next or iterator.Pager.
}
func ExampleNewGCSReference() {
gcsRef := bigquery.NewGCSReference("gs://my-bucket/my-object")
fmt.Println(gcsRef)
}
func ExampleClient_Query() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
q := client.Query("select name, num from t1")
q.DefaultProjectID = "project-id"
// TODO: set other options on the Query.
// TODO: Call Query.Run or Query.Read.
}
func ExampleClient_Query_parameters() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
q := client.Query("select num from t1 where name = @user")
q.Parameters = []bigquery.QueryParameter{
{Name: "user", Value: "Elizabeth"},
}
// TODO: set other options on the Query.
// TODO: Call Query.Run or Query.Read.
}
// This example demonstrates how to run a query job on a table
// with a customer-managed encryption key. The same
// applies to load and copy jobs as well.
func ExampleClient_Query_encryptionKey() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
q := client.Query("select name, num from t1")
// TODO: Replace this key with a key you have created in Cloud KMS.
keyName := "projects/P/locations/L/keyRings/R/cryptoKeys/K"
q.DestinationEncryptionConfig = &bigquery.EncryptionConfig{KMSKeyName: keyName}
// TODO: set other options on the Query.
// TODO: Call Query.Run or Query.Read.
}
func ExampleQuery_Read() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
q := client.Query("select name, num from t1")
it, err := q.Read(ctx)
if err != nil {
// TODO: Handle error.
}
_ = it // TODO: iterate using Next or iterator.Pager.
}
func ExampleRowIterator_Next() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
q := client.Query("select name, num from t1")
it, err := q.Read(ctx)
if err != nil {
// TODO: Handle error.
}
for {
var row []bigquery.Value
err := it.Next(&row)
if err == iterator.Done {
break
}
if err != nil {
// TODO: Handle error.
}
fmt.Println(row)
}
}
func ExampleRowIterator_Next_struct() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
type score struct {
Name string
Num int
}
q := client.Query("select name, num from t1")
it, err := q.Read(ctx)
if err != nil {
// TODO: Handle error.
}
for {
var s score
err := it.Next(&s)
if err == iterator.Done {
break
}
if err != nil {
// TODO: Handle error.
}
fmt.Println(s)
}
}
func ExampleJob_Read() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
q := client.Query("select name, num from t1")
// Call Query.Run to get a Job, then call Read on the job.
// Note: Query.Read is a shorthand for this.
job, err := q.Run(ctx)
if err != nil {
// TODO: Handle error.
}
it, err := job.Read(ctx)
if err != nil {
// TODO: Handle error.
}
_ = it // TODO: iterate using Next or iterator.Pager.
}
func ExampleJob_Wait() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.Dataset("my_dataset")
job, err := ds.Table("t1").CopierFrom(ds.Table("t2")).Run(ctx)
if err != nil {
// TODO: Handle error.
}
status, err := job.Wait(ctx)
if err != nil {
// TODO: Handle error.
}
if status.Err() != nil {
// TODO: Handle error.
}
}
func ExampleJob_Config() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.Dataset("my_dataset")
job, err := ds.Table("t1").CopierFrom(ds.Table("t2")).Run(ctx)
if err != nil {
// TODO: Handle error.
}
jc, err := job.Config()
if err != nil {
// TODO: Handle error.
}
copyConfig := jc.(*bigquery.CopyConfig)
fmt.Println(copyConfig.Dst, copyConfig.CreateDisposition)
}
func ExampleDataset_Create() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.Dataset("my_dataset")
if err := ds.Create(ctx, &bigquery.DatasetMetadata{Location: "EU"}); err != nil {
// TODO: Handle error.
}
}
func ExampleDataset_Delete() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
if err := client.Dataset("my_dataset").Delete(ctx); err != nil {
// TODO: Handle error.
}
}
func ExampleDataset_Metadata() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
md, err := client.Dataset("my_dataset").Metadata(ctx)
if err != nil {
// TODO: Handle error.
}
fmt.Println(md)
}
// This example illustrates how to perform a read-modify-write sequence on dataset
// metadata. Passing the metadata's ETag to the Update call ensures that the call
// will fail if the metadata was changed since the read.
func ExampleDataset_Update_readModifyWrite() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.Dataset("my_dataset")
md, err := ds.Metadata(ctx)
if err != nil {
// TODO: Handle error.
}
md2, err := ds.Update(ctx,
bigquery.DatasetMetadataToUpdate{Name: "new " + md.Name},
md.ETag)
if err != nil {
// TODO: Handle error.
}
fmt.Println(md2)
}
// To perform a blind write, ignoring the existing state (and possibly overwriting
// other updates), pass the empty string as the etag.
func ExampleDataset_Update_blindWrite() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
md, err := client.Dataset("my_dataset").Update(ctx, bigquery.DatasetMetadataToUpdate{Name: "blind"}, "")
if err != nil {
// TODO: Handle error.
}
fmt.Println(md)
}
func ExampleDataset_Table() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
// Table creates a reference to the table. It does not create the actual
// table in BigQuery; to do so, use Table.Create.
t := client.Dataset("my_dataset").Table("my_table")
fmt.Println(t)
}
func ExampleDataset_Tables() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.Dataset("my_dataset").Tables(ctx)
_ = it // TODO: iterate using Next or iterator.Pager.
}
func ExampleDatasetIterator_Next() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.Datasets(ctx)
for {
ds, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
// TODO: Handle error.
}
fmt.Println(ds)
}
}
func ExampleInferSchema() {
type Item struct {
Name string
Size float64
Count int
}
schema, err := bigquery.InferSchema(Item{})
if err != nil {
fmt.Println(err)
// TODO: Handle error.
}
for _, fs := range schema {
fmt.Println(fs.Name, fs.Type)
}
// Output:
// Name STRING
// Size FLOAT
// Count INTEGER
}
func ExampleInferSchema_tags() {
type Item struct {
Name string
Size float64
Count int `bigquery:"number"`
Secret []byte `bigquery:"-"`
Optional bigquery.NullBool
OptBytes []byte `bigquery:",nullable"`
}
schema, err := bigquery.InferSchema(Item{})
if err != nil {
fmt.Println(err)
// TODO: Handle error.
}
for _, fs := range schema {
fmt.Println(fs.Name, fs.Type, fs.Required)
}
// Output:
// Name STRING true
// Size FLOAT true
// number INTEGER true
// Optional BOOLEAN false
// OptBytes BYTES false
}
func ExampleTable_Create() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
t := client.Dataset("my_dataset").Table("new-table")
if err := t.Create(ctx, nil); err != nil {
// TODO: Handle error.
}
}
// Initialize a new table by passing TableMetadata to Table.Create.
func ExampleTable_Create_initialize() {
ctx := context.Background()
// Infer table schema from a Go type.
schema, err := bigquery.InferSchema(Item{})
if err != nil {
// TODO: Handle error.
}
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
t := client.Dataset("my_dataset").Table("new-table")
if err := t.Create(ctx,
&bigquery.TableMetadata{
Name: "My New Table",
Schema: schema,
ExpirationTime: time.Now().Add(24 * time.Hour),
}); err != nil {
// TODO: Handle error.
}
}
// This example demonstrates how to create a table with
// a customer-managed encryption key.
func ExampleTable_Create_encryptionKey() {
ctx := context.Background()
// Infer table schema from a Go type.
schema, err := bigquery.InferSchema(Item{})
if err != nil {
// TODO: Handle error.
}
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
t := client.Dataset("my_dataset").Table("new-table")
// TODO: Replace this key with a key you have created in Cloud KMS.
keyName := "projects/P/locations/L/keyRings/R/cryptoKeys/K"
if err := t.Create(ctx,
&bigquery.TableMetadata{
Name: "My New Table",
Schema: schema,
EncryptionConfig: &bigquery.EncryptionConfig{KMSKeyName: keyName},
}); err != nil {
// TODO: Handle error.
}
}
func ExampleTable_Delete() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
if err := client.Dataset("my_dataset").Table("my_table").Delete(ctx); err != nil {
// TODO: Handle error.
}
}
func ExampleTable_Metadata() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
md, err := client.Dataset("my_dataset").Table("my_table").Metadata(ctx)
if err != nil {
// TODO: Handle error.
}
fmt.Println(md)
}
func ExampleTable_Uploader() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
u := client.Dataset("my_dataset").Table("my_table").Uploader()
_ = u // TODO: Use u.
}
func ExampleTable_Uploader_options() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
u := client.Dataset("my_dataset").Table("my_table").Uploader()
u.SkipInvalidRows = true
u.IgnoreUnknownValues = true
_ = u // TODO: Use u.
}
func ExampleTable_CopierFrom() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
ds := client.Dataset("my_dataset")
c := ds.Table("combined").CopierFrom(ds.Table("t1"), ds.Table("t2"))
c.WriteDisposition = bigquery.WriteTruncate
// TODO: set other options on the Copier.
job, err := c.Run(ctx)
if err != nil {
// TODO: Handle error.
}
status, err := job.Wait(ctx)
if err != nil {
// TODO: Handle error.
}
if status.Err() != nil {
// TODO: Handle error.
}
}
func ExampleTable_ExtractorTo() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
gcsRef := bigquery.NewGCSReference("gs://my-bucket/my-object")
gcsRef.FieldDelimiter = ":"
// TODO: set other options on the GCSReference.
ds := client.Dataset("my_dataset")
extractor := ds.Table("my_table").ExtractorTo(gcsRef)
extractor.DisableHeader = true
// TODO: set other options on the Extractor.
job, err := extractor.Run(ctx)
if err != nil {
// TODO: Handle error.
}
status, err := job.Wait(ctx)
if err != nil {
// TODO: Handle error.
}
if status.Err() != nil {
// TODO: Handle error.
}
}
func ExampleTable_LoaderFrom() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
gcsRef := bigquery.NewGCSReference("gs://my-bucket/my-object")
gcsRef.AllowJaggedRows = true
gcsRef.MaxBadRecords = 5
gcsRef.Schema = schema
// TODO: set other options on the GCSReference.
ds := client.Dataset("my_dataset")
loader := ds.Table("my_table").LoaderFrom(gcsRef)
loader.CreateDisposition = bigquery.CreateNever
// TODO: set other options on the Loader.
job, err := loader.Run(ctx)
if err != nil {
// TODO: Handle error.
}
status, err := job.Wait(ctx)
if err != nil {
// TODO: Handle error.
}
if status.Err() != nil {
// TODO: Handle error.
}
}
func ExampleTable_LoaderFrom_reader() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
f, err := os.Open("data.csv")
if err != nil {
// TODO: Handle error.
}
rs := bigquery.NewReaderSource(f)
rs.AllowJaggedRows = true
rs.MaxBadRecords = 5
rs.Schema = schema
// TODO: set other options on the GCSReference.
ds := client.Dataset("my_dataset")
loader := ds.Table("my_table").LoaderFrom(rs)
loader.CreateDisposition = bigquery.CreateNever
// TODO: set other options on the Loader.
job, err := loader.Run(ctx)
if err != nil {
// TODO: Handle error.
}
status, err := job.Wait(ctx)
if err != nil {
// TODO: Handle error.
}
if status.Err() != nil {
// TODO: Handle error.
}
}
func ExampleTable_Read() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.Dataset("my_dataset").Table("my_table").Read(ctx)
_ = it // TODO: iterate using Next or iterator.Pager.
}
// This example illustrates how to perform a read-modify-write sequence on table
// metadata. Passing the metadata's ETag to the Update call ensures that the call
// will fail if the metadata was changed since the read.
func ExampleTable_Update_readModifyWrite() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
t := client.Dataset("my_dataset").Table("my_table")
md, err := t.Metadata(ctx)
if err != nil {
// TODO: Handle error.
}
md2, err := t.Update(ctx,
bigquery.TableMetadataToUpdate{Name: "new " + md.Name},
md.ETag)
if err != nil {
// TODO: Handle error.
}
fmt.Println(md2)
}
// To perform a blind write, ignoring the existing state (and possibly overwriting
// other updates), pass the empty string as the etag.
func ExampleTable_Update_blindWrite() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
t := client.Dataset("my_dataset").Table("my_table")
tm, err := t.Update(ctx, bigquery.TableMetadataToUpdate{
Description: "my favorite table",
}, "")
if err != nil {
// TODO: Handle error.
}
fmt.Println(tm)
}
func ExampleTableIterator_Next() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
it := client.Dataset("my_dataset").Tables(ctx)
for {
t, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
// TODO: Handle error.
}
fmt.Println(t)
}
}
type Item struct {
Name string
Size float64
Count int
}
// Save implements the ValueSaver interface.
func (i *Item) Save() (map[string]bigquery.Value, string, error) {
return map[string]bigquery.Value{
"Name": i.Name,
"Size": i.Size,
"Count": i.Count,
}, "", nil
}
func ExampleUploader_Put() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
u := client.Dataset("my_dataset").Table("my_table").Uploader()
// Item implements the ValueSaver interface.
items := []*Item{
{Name: "n1", Size: 32.6, Count: 7},
{Name: "n2", Size: 4, Count: 2},
{Name: "n3", Size: 101.5, Count: 1},
}
if err := u.Put(ctx, items); err != nil {
// TODO: Handle error.
}
}
var schema bigquery.Schema
func ExampleUploader_Put_structSaver() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
u := client.Dataset("my_dataset").Table("my_table").Uploader()
type score struct {
Name string
Num int
}
// Assume schema holds the table's schema.
savers := []*bigquery.StructSaver{
{Struct: score{Name: "n1", Num: 12}, Schema: schema, InsertID: "id1"},
{Struct: score{Name: "n2", Num: 31}, Schema: schema, InsertID: "id2"},
{Struct: score{Name: "n3", Num: 7}, Schema: schema, InsertID: "id3"},
}
if err := u.Put(ctx, savers); err != nil {
// TODO: Handle error.
}
}
func ExampleUploader_Put_struct() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
u := client.Dataset("my_dataset").Table("my_table").Uploader()
type score struct {
Name string
Num int
}
scores := []score{
{Name: "n1", Num: 12},
{Name: "n2", Num: 31},
{Name: "n3", Num: 7},
}
// Schema is inferred from the score type.
if err := u.Put(ctx, scores); err != nil {
// TODO: Handle error.
}
}
func ExampleUploader_Put_valuesSaver() {
ctx := context.Background()
client, err := bigquery.NewClient(ctx, "project-id")
if err != nil {
// TODO: Handle error.
}
u := client.Dataset("my_dataset").Table("my_table").Uploader()
var vss []*bigquery.ValuesSaver
for i, name := range []string{"n1", "n2", "n3"} {
// Assume schema holds the table's schema.
vss = append(vss, &bigquery.ValuesSaver{
Schema: schema,
InsertID: name,
Row: []bigquery.Value{name, int64(i)},
})
}
if err := u.Put(ctx, vss); err != nil {
// TODO: Handle error.
}
}