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90 lines
2.8 KiB
Go
90 lines
2.8 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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// LoadConfig holds the configuration for a load job.
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type LoadConfig 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 source from which data will be loaded.
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Src LoadSource
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// Dst is the table into which the data will be loaded.
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Dst *Table
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// CreateDisposition specifies the circumstances under which the destination table will be created.
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// The default is CreateIfNeeded.
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CreateDisposition TableCreateDisposition
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// WriteDisposition specifies how existing data in the destination table is treated.
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// The default is WriteAppend.
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WriteDisposition TableWriteDisposition
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}
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// A Loader loads data from Google Cloud Storage into a BigQuery table.
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type Loader struct {
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LoadConfig
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c *Client
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}
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// A LoadSource represents a source of data that can be loaded into
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// a BigQuery table.
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//
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// This package defines two LoadSources: GCSReference, for Google Cloud Storage
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// objects, and ReaderSource, for data read from an io.Reader.
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type LoadSource interface {
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populateInsertJobConfForLoad(conf *insertJobConf)
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}
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// LoaderFrom returns a Loader which can be used to load data into a BigQuery table.
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// The returned Loader may optionally be further configured before its Run method is called.
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// See GCSReference and ReaderSource for additional configuration options that
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// affect loading.
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func (t *Table) LoaderFrom(src LoadSource) *Loader {
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return &Loader{
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c: t.c,
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LoadConfig: LoadConfig{
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Src: src,
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Dst: t,
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},
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}
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}
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// Run initiates a load job.
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func (l *Loader) Run(ctx context.Context) (*Job, error) {
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job := &bq.Job{
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JobReference: createJobRef(l.JobID, l.AddJobIDSuffix, l.c.projectID),
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Configuration: &bq.JobConfiguration{
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Load: &bq.JobConfigurationLoad{
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CreateDisposition: string(l.CreateDisposition),
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WriteDisposition: string(l.WriteDisposition),
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},
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},
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}
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conf := &insertJobConf{job: job}
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l.Src.populateInsertJobConfForLoad(conf)
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job.Configuration.Load.DestinationTable = l.Dst.tableRefProto()
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return l.c.insertJob(ctx, conf)
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}
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