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main.go
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main.go
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// Copyright 2015 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.
// read is an example client of the bigquery client library.
// It reads from a table, returning the data via an Iterator.
package main
import (
"flag"
"fmt"
"log"
"os"
"regexp"
"strings"
"text/tabwriter"
"golang.org/x/net/context"
"golang.org/x/oauth2/google"
"google.golang.org/cloud/bigquery"
)
var (
project = flag.String("project", "", "The ID of a Google Cloud Platform project")
dataset = flag.String("dataset", "", "The ID of a BigQuery dataset")
table = flag.String("table", ".*", "A regular expression to match the IDs of tables to read.")
jobID = flag.String("jobid", "", "The ID of a query job that has already been submitted."+
" If set, --dataset, --table will be ignored, and results will be read from the specified job.")
)
func printValues(it *bigquery.Iterator) {
// one-space padding.
tw := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)
for it.Next(context.Background()) {
var vals bigquery.ValueList
if err := it.Get(&vals); err != nil {
fmt.Printf("err calling get: %v\n", err)
} else {
sep := ""
for _, v := range vals {
fmt.Fprintf(tw, "%s%v", sep, v)
sep = "\t"
}
fmt.Fprintf(tw, "\n")
}
}
tw.Flush()
fmt.Printf("\n")
if err := it.Err(); err != nil {
fmt.Printf("err reading: %v\n", err)
}
}
func printTable(client *bigquery.Client, t *bigquery.Table) {
it, err := client.Read(context.Background(), t)
if err != nil {
log.Fatalf("Reading: %v", err)
}
id := t.FullyQualifiedName()
fmt.Printf("%s\n%s\n", id, strings.Repeat("-", len(id)))
printValues(it)
}
func printQueryResults(client *bigquery.Client, queryJobID string) {
job, err := client.JobFromID(context.Background(), queryJobID)
if err != nil {
log.Fatalf("Loading job: %v", err)
}
it, err := client.Read(context.Background(), job)
if err != nil {
log.Fatalf("Reading: %v", err)
}
// TODO: print schema.
printValues(it)
}
func main() {
flag.Parse()
flagsOk := true
if flag.Lookup("project").Value.String() == "" {
fmt.Fprintf(os.Stderr, "Flag --project is required\n")
flagsOk = false
}
var sourceFlagCount int
if flag.Lookup("dataset").Value.String() != "" {
sourceFlagCount++
}
if flag.Lookup("jobid").Value.String() != "" {
sourceFlagCount++
}
if sourceFlagCount != 1 {
fmt.Fprintf(os.Stderr, "Exactly one of --dataset or --jobid must be set\n")
flagsOk = false
}
if !flagsOk {
os.Exit(1)
}
tableRE, err := regexp.Compile(*table)
if err != nil {
fmt.Fprintf(os.Stderr, "--table is not a valid regular expression: %q\n", *table)
os.Exit(1)
}
httpClient, err := google.DefaultClient(context.Background(), bigquery.Scope)
if err != nil {
log.Fatalf("Creating http client: %v", err)
}
client, err := bigquery.NewClient(httpClient, *project)
if err != nil {
log.Fatalf("Creating bigquery client: %v", err)
}
if *jobID != "" {
printQueryResults(client, *jobID)
return
}
ds := client.Dataset(*dataset)
var tables []*bigquery.Table
tables, err = ds.ListTables(context.Background())
if err != nil {
log.Fatalf("Listing tables: %v", err)
}
for _, t := range tables {
if tableRE.MatchString(t.TableID) {
printTable(client, t)
}
}
}