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102 lines
2.9 KiB
Go
102 lines
2.9 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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// CopyConfig holds the configuration for a copy job.
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type CopyConfig struct {
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// Srcs are the tables from which data will be copied.
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Srcs []*Table
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// Dst is the table into which the data will be copied.
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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 WriteEmpty.
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WriteDisposition TableWriteDisposition
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// The labels associated with this job.
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Labels map[string]string
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}
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func (c *CopyConfig) toBQ() *bq.JobConfiguration {
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var ts []*bq.TableReference
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for _, t := range c.Srcs {
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ts = append(ts, t.toBQ())
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}
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return &bq.JobConfiguration{
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Labels: c.Labels,
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Copy: &bq.JobConfigurationTableCopy{
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CreateDisposition: string(c.CreateDisposition),
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WriteDisposition: string(c.WriteDisposition),
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DestinationTable: c.Dst.toBQ(),
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SourceTables: ts,
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},
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}
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}
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func bqToCopyConfig(q *bq.JobConfiguration, c *Client) *CopyConfig {
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cc := &CopyConfig{
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Labels: q.Labels,
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CreateDisposition: TableCreateDisposition(q.Copy.CreateDisposition),
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WriteDisposition: TableWriteDisposition(q.Copy.WriteDisposition),
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Dst: bqToTable(q.Copy.DestinationTable, c),
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}
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for _, t := range q.Copy.SourceTables {
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cc.Srcs = append(cc.Srcs, bqToTable(t, c))
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}
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return cc
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}
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// A Copier copies data into a BigQuery table from one or more BigQuery tables.
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type Copier struct {
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JobIDConfig
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CopyConfig
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c *Client
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}
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// CopierFrom returns a Copier which can be used to copy data into a
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// BigQuery table from one or more BigQuery tables.
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// The returned Copier may optionally be further configured before its Run method is called.
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func (t *Table) CopierFrom(srcs ...*Table) *Copier {
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return &Copier{
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c: t.c,
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CopyConfig: CopyConfig{
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Srcs: srcs,
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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 copy job.
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func (c *Copier) Run(ctx context.Context) (*Job, error) {
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return c.c.insertJob(ctx, c.newJob(), nil)
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}
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func (c *Copier) newJob() *bq.Job {
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return &bq.Job{
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JobReference: c.JobIDConfig.createJobRef(c.c.projectID),
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Configuration: c.CopyConfig.toBQ(),
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}
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}
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