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// 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
import (
"golang.org/x/net/context"
bq "google.golang.org/api/bigquery/v2"
)
// ExtractConfig holds the configuration for an extract job.
type ExtractConfig struct {
// JobID is the ID to use for the extract job. If empty, a job ID will be automatically created.
JobID string
// Src is the table from which data will be extracted.
Src *Table
// Dst is the destination into which the data will be extracted.
Dst *GCSReference
// DisableHeader disables the printing of a header row in exported data.
DisableHeader bool
}
// An Extractor extracts data from a BigQuery table into Google Cloud Storage.
type Extractor struct {
ExtractConfig
c *Client
}
// ExtractorTo returns an Extractor which can be used to extract data from a
// BigQuery table into Google Cloud Storage.
// The returned Extractor may optionally be further configured before its Run method is called.
func (t *Table) ExtractorTo(dst *GCSReference) *Extractor {
return &Extractor{
c: t.c,
ExtractConfig: ExtractConfig{
Src: t,
Dst: dst,
},
}
}
// Run initiates an extract job.
func (e *Extractor) Run(ctx context.Context) (*Job, error) {
conf := &bq.JobConfigurationExtract{}
job := &bq.Job{Configuration: &bq.JobConfiguration{Extract: conf}}
setJobRef(job, e.JobID, e.c.projectID)
conf.DestinationUris = append([]string{}, e.Dst.uris...)
conf.Compression = string(e.Dst.Compression)
conf.DestinationFormat = string(e.Dst.DestinationFormat)
conf.FieldDelimiter = e.Dst.FieldDelimiter
conf.SourceTable = e.Src.tableRefProto()
if e.DisableHeader {
f := false
conf.PrintHeader = &f
}
return e.c.insertJob(ctx, &insertJobConf{job: job})
}
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