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80 lines
2.4 KiB
Go
80 lines
2.4 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
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import (
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"golang.org/x/net/context"
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bq "google.golang.org/api/bigquery/v2"
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)
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// ExtractConfig holds the configuration for an extract job.
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type ExtractConfig struct {
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// JobID is the ID to use for the job. If empty, a random job ID will be generated.
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JobID string
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// If AddJobIDSuffix is true, then a random string will be appended to JobID.
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AddJobIDSuffix bool
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// Src is the table from which data will be extracted.
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Src *Table
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// Dst is the destination into which the data will be extracted.
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Dst *GCSReference
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// DisableHeader disables the printing of a header row in exported data.
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DisableHeader bool
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}
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// An Extractor extracts data from a BigQuery table into Google Cloud Storage.
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type Extractor struct {
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ExtractConfig
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c *Client
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}
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// ExtractorTo returns an Extractor which can be used to extract data from a
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// BigQuery table into Google Cloud Storage.
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// The returned Extractor may optionally be further configured before its Run method is called.
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func (t *Table) ExtractorTo(dst *GCSReference) *Extractor {
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return &Extractor{
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c: t.c,
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ExtractConfig: ExtractConfig{
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Src: t,
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Dst: dst,
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},
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}
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}
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// Run initiates an extract job.
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func (e *Extractor) Run(ctx context.Context) (*Job, error) {
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var printHeader *bool
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if e.DisableHeader {
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f := false
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printHeader = &f
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}
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job := &bq.Job{
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JobReference: createJobRef(e.JobID, e.AddJobIDSuffix, e.c.projectID),
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Configuration: &bq.JobConfiguration{
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Extract: &bq.JobConfigurationExtract{
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DestinationUris: append([]string{}, e.Dst.uris...),
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Compression: string(e.Dst.Compression),
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DestinationFormat: string(e.Dst.DestinationFormat),
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FieldDelimiter: e.Dst.FieldDelimiter,
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SourceTable: e.Src.tableRefProto(),
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PrintHeader: printHeader,
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},
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},
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}
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return e.c.insertJob(ctx, &insertJobConf{job: job})
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}
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