forked from googleapis/google-cloud-go
/
read.go
64 lines (54 loc) · 1.97 KB
/
read.go
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// Copyright 2015 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 (
"errors"
"golang.org/x/net/context"
)
func (conf *readTableConf) fetch(ctx context.Context, s service, token string) (*readDataResult, error) {
return s.readTabledata(ctx, conf, token)
}
func (conf *readTableConf) setPaging(pc *pagingConf) { conf.paging = *pc }
// Read fetches the contents of the table.
func (t *Table) Read(ctx context.Context) *RowIterator {
return newRowIterator(ctx, t.c.service, &readTableConf{
projectID: t.ProjectID,
datasetID: t.DatasetID,
tableID: t.TableID,
})
}
func (conf *readQueryConf) fetch(ctx context.Context, s service, token string) (*readDataResult, error) {
return s.readQuery(ctx, conf, token)
}
func (conf *readQueryConf) setPaging(pc *pagingConf) { conf.paging = *pc }
// Read fetches the results of a query job.
// If j is not a query job, Read returns an error.
func (j *Job) Read(ctx context.Context) (*RowIterator, error) {
if !j.isQuery {
return nil, errors.New("Cannot read from a non-query job")
}
return newRowIterator(ctx, j.service, &readQueryConf{
projectID: j.projectID,
jobID: j.jobID,
}), nil
}
// Read submits a query for execution and returns the results via a RowIterator.
// It is a shorthand for Query.Run followed by Job.Read.
func (q *Query) Read(ctx context.Context) (*RowIterator, error) {
job, err := q.Run(ctx)
if err != nil {
return nil, err
}
return job.Read(ctx)
}