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758 lines
18 KiB
Go
758 lines
18 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bigquery_test
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import (
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"fmt"
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"os"
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"time"
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"cloud.google.com/go/bigquery"
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"golang.org/x/net/context"
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"google.golang.org/api/iterator"
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)
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func ExampleNewClient() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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_ = client // TODO: Use client.
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}
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func ExampleClient_Dataset() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.Dataset("my_dataset")
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fmt.Println(ds)
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}
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func ExampleClient_DatasetInProject() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.DatasetInProject("their-project-id", "their-dataset")
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fmt.Println(ds)
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}
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func ExampleClient_Datasets() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it := client.Datasets(ctx)
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_ = it // TODO: iterate using Next or iterator.Pager.
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}
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func ExampleClient_DatasetsInProject() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it := client.DatasetsInProject(ctx, "their-project-id")
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_ = it // TODO: iterate using Next or iterator.Pager.
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}
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func getJobID() string { return "" }
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func ExampleClient_JobFromID() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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jobID := getJobID() // Get a job ID using Job.ID, the console or elsewhere.
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job, err := client.JobFromID(ctx, jobID)
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(job.LastStatus()) // Display the job's status.
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}
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func ExampleClient_Jobs() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it := client.Jobs(ctx)
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it.State = bigquery.Running // list only running jobs.
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_ = it // TODO: iterate using Next or iterator.Pager.
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}
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func ExampleNewGCSReference() {
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gcsRef := bigquery.NewGCSReference("gs://my-bucket/my-object")
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fmt.Println(gcsRef)
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}
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func ExampleClient_Query() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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q := client.Query("select name, num from t1")
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q.DefaultProjectID = "project-id"
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// TODO: set other options on the Query.
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// TODO: Call Query.Run or Query.Read.
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}
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func ExampleClient_Query_parameters() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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q := client.Query("select num from t1 where name = @user")
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q.Parameters = []bigquery.QueryParameter{
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{Name: "user", Value: "Elizabeth"},
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}
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// TODO: set other options on the Query.
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// TODO: Call Query.Run or Query.Read.
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}
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func ExampleQuery_Read() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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q := client.Query("select name, num from t1")
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it, err := q.Read(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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_ = it // TODO: iterate using Next or iterator.Pager.
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}
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func ExampleRowIterator_Next() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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q := client.Query("select name, num from t1")
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it, err := q.Read(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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for {
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var row []bigquery.Value
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err := it.Next(&row)
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if err == iterator.Done {
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break
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}
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(row)
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}
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}
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func ExampleRowIterator_Next_struct() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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type score struct {
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Name string
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Num int
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}
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q := client.Query("select name, num from t1")
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it, err := q.Read(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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for {
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var s score
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err := it.Next(&s)
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if err == iterator.Done {
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break
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}
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(s)
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}
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}
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func ExampleJob_Read() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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q := client.Query("select name, num from t1")
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// Call Query.Run to get a Job, then call Read on the job.
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// Note: Query.Read is a shorthand for this.
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job, err := q.Run(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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it, err := job.Read(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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_ = it // TODO: iterate using Next or iterator.Pager.
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}
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func ExampleJob_Wait() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.Dataset("my_dataset")
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job, err := ds.Table("t1").CopierFrom(ds.Table("t2")).Run(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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status, err := job.Wait(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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if status.Err() != nil {
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// TODO: Handle error.
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}
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}
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func ExampleJob_Config() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.Dataset("my_dataset")
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job, err := ds.Table("t1").CopierFrom(ds.Table("t2")).Run(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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jc, err := job.Config()
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if err != nil {
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// TODO: Handle error.
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}
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copyConfig := jc.(*bigquery.CopyConfig)
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fmt.Println(copyConfig.Dst, copyConfig.CreateDisposition)
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}
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func ExampleDataset_Create() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.Dataset("my_dataset")
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if err := ds.Create(ctx, &bigquery.DatasetMetadata{Location: "EU"}); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleDataset_Delete() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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if err := client.Dataset("my_dataset").Delete(ctx); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleDataset_Metadata() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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md, err := client.Dataset("my_dataset").Metadata(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(md)
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}
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// This example illustrates how to perform a read-modify-write sequence on dataset
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// metadata. Passing the metadata's ETag to the Update call ensures that the call
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// will fail if the metadata was changed since the read.
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func ExampleDataset_Update_readModifyWrite() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.Dataset("my_dataset")
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md, err := ds.Metadata(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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md2, err := ds.Update(ctx,
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bigquery.DatasetMetadataToUpdate{Name: "new " + md.Name},
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md.ETag)
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(md2)
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}
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// To perform a blind write, ignoring the existing state (and possibly overwriting
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// other updates), pass the empty string as the etag.
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func ExampleDataset_Update_blindWrite() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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md, err := client.Dataset("my_dataset").Update(ctx, bigquery.DatasetMetadataToUpdate{Name: "blind"}, "")
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(md)
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}
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func ExampleDataset_Table() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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// Table creates a reference to the table. It does not create the actual
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// table in BigQuery; to do so, use Table.Create.
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t := client.Dataset("my_dataset").Table("my_table")
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fmt.Println(t)
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}
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func ExampleDataset_Tables() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it := client.Dataset("my_dataset").Tables(ctx)
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_ = it // TODO: iterate using Next or iterator.Pager.
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}
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func ExampleDatasetIterator_Next() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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it := client.Datasets(ctx)
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for {
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ds, err := it.Next()
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if err == iterator.Done {
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break
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}
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(ds)
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}
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}
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func ExampleInferSchema() {
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type Item struct {
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Name string
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Size float64
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Count int
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}
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schema, err := bigquery.InferSchema(Item{})
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if err != nil {
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fmt.Println(err)
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// TODO: Handle error.
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}
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for _, fs := range schema {
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fmt.Println(fs.Name, fs.Type)
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}
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// Output:
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// Name STRING
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// Size FLOAT
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// Count INTEGER
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}
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func ExampleInferSchema_tags() {
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type Item struct {
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Name string
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Size float64
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Count int `bigquery:"number"`
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Secret []byte `bigquery:"-"`
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}
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schema, err := bigquery.InferSchema(Item{})
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if err != nil {
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fmt.Println(err)
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// TODO: Handle error.
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}
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for _, fs := range schema {
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fmt.Println(fs.Name, fs.Type)
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}
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// Output:
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// Name STRING
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// Size FLOAT
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// number INTEGER
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}
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func ExampleTable_Create() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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t := client.Dataset("my_dataset").Table("new-table")
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if err := t.Create(ctx, nil); err != nil {
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// TODO: Handle error.
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}
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}
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// Initialize a new table by passing TableMetadata to Table.Create.
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func ExampleTable_Create_initialize() {
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ctx := context.Background()
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// Infer table schema from a Go type.
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schema, err := bigquery.InferSchema(Item{})
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if err != nil {
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// TODO: Handle error.
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}
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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t := client.Dataset("my_dataset").Table("new-table")
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if err := t.Create(ctx,
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&bigquery.TableMetadata{
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Name: "My New Table",
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Schema: schema,
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ExpirationTime: time.Now().Add(24 * time.Hour),
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}); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleTable_Delete() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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if err := client.Dataset("my_dataset").Table("my_table").Delete(ctx); err != nil {
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// TODO: Handle error.
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}
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}
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func ExampleTable_Metadata() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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md, err := client.Dataset("my_dataset").Table("my_table").Metadata(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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fmt.Println(md)
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}
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func ExampleTable_Uploader() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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u := client.Dataset("my_dataset").Table("my_table").Uploader()
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_ = u // TODO: Use u.
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}
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func ExampleTable_Uploader_options() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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u := client.Dataset("my_dataset").Table("my_table").Uploader()
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u.SkipInvalidRows = true
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u.IgnoreUnknownValues = true
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_ = u // TODO: Use u.
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}
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func ExampleTable_CopierFrom() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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ds := client.Dataset("my_dataset")
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c := ds.Table("combined").CopierFrom(ds.Table("t1"), ds.Table("t2"))
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c.WriteDisposition = bigquery.WriteTruncate
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// TODO: set other options on the Copier.
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job, err := c.Run(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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status, err := job.Wait(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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if status.Err() != nil {
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// TODO: Handle error.
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}
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}
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func ExampleTable_ExtractorTo() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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gcsRef := bigquery.NewGCSReference("gs://my-bucket/my-object")
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gcsRef.FieldDelimiter = ":"
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// TODO: set other options on the GCSReference.
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ds := client.Dataset("my_dataset")
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extractor := ds.Table("my_table").ExtractorTo(gcsRef)
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extractor.DisableHeader = true
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// TODO: set other options on the Extractor.
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job, err := extractor.Run(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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status, err := job.Wait(ctx)
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if err != nil {
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// TODO: Handle error.
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}
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if status.Err() != nil {
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// TODO: Handle error.
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}
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}
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func ExampleTable_LoaderFrom() {
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ctx := context.Background()
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client, err := bigquery.NewClient(ctx, "project-id")
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if err != nil {
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// TODO: Handle error.
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}
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gcsRef := bigquery.NewGCSReference("gs://my-bucket/my-object")
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gcsRef.AllowJaggedRows = true
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gcsRef.MaxBadRecords = 5
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|
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.
|
|
}
|
|
}
|