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main.go
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main.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
// beam-playground:
// name: read-query
// description: BigQueryIO read query example.
// multifile: false
// context_line: 42
// never_run: true
// always_run: true
// categories:
// - Quickstart
// complexity: ADVANCED
// tags:
// - hellobeam
package main
import (
"context"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/io/bigqueryio"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
"github.com/apache/beam/sdks/v2/go/pkg/beam/transforms/top"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/debug"
"cloud.google.com/go/bigquery"
internal_log "log"
"reflect"
)
type Game struct {
GameID bigquery.NullString `bigquery:"gameId"`
GameNumber bigquery.NullInt64 `bigquery:"gameNumber"`
SeasonID bigquery.NullString `bigquery:"seasonId"`
Year bigquery.NullInt64 `bigquery:"year"`
Type bigquery.NullString `bigquery:"type"`
DayNight bigquery.NullString `bigquery:"dayNight"`
Duration bigquery.NullString `bigquery:"duration"`
}
func main() {
internal_log.Println("Running Task")
ctx := context.Background()
p := beam.NewPipeline()
s := p.Root()
project := "apache-beam-testing"
// Build a PCollection<CommentRow> by querying BigQuery.
rows := bigqueryio.Query(s, project, "select * from `bigquery-public-data.baseball.schedules`",
reflect.TypeOf(Game{}), bigqueryio.UseStandardSQL())
fixedSizeLines := top.Largest(s, rows, 5, less)
debug.Print(s, fixedSizeLines)
// Now that the pipeline is fully constructed, we execute it.
if err := beamx.Run(ctx, p); err != nil {
log.Exitf(ctx, "Failed to execute job: %v", err)
}
}
func less(a, b Game) bool {
return true
}