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80 lines
2.5 KiB
Go
80 lines
2.5 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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// 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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// 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 WriteAppend.
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WriteDisposition TableWriteDisposition
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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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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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conf := &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.tableRefProto(),
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}
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for _, t := range c.Srcs {
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conf.SourceTables = append(conf.SourceTables, t.tableRefProto())
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}
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job := &bq.Job{
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JobReference: createJobRef(c.JobID, c.AddJobIDSuffix, c.c.projectID),
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Configuration: &bq.JobConfiguration{Copy: conf},
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}
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return c.c.insertJob(ctx, &insertJobConf{job: job})
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}
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