| // 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 "golang.org/x/net/context" |
| |
| // RecordsPerRequest returns a ReadOption that sets the number of records to fetch per request when streaming data from BigQuery. |
| func RecordsPerRequest(n int64) ReadOption { return recordsPerRequest(n) } |
| |
| type recordsPerRequest int64 |
| |
| func (opt recordsPerRequest) customizeRead(conf *pagingConf) { |
| conf.recordsPerRequest = int64(opt) |
| conf.setRecordsPerRequest = true |
| } |
| |
| // StartIndex returns a ReadOption that sets the zero-based index of the row to start reading from. |
| func StartIndex(i uint64) ReadOption { return startIndex(i) } |
| |
| type startIndex uint64 |
| |
| func (opt startIndex) customizeRead(conf *pagingConf) { |
| conf.startIndex = uint64(opt) |
| } |
| |
| func (conf *readTableConf) fetch(ctx context.Context, s service, token string) (*readDataResult, error) { |
| return s.readTabledata(ctx, conf, token) |
| } |
| |
| // Read fetches the contents of the table. |
| func (t *Table) Read(_ context.Context, options ...ReadOption) (*Iterator, error) { |
| conf := &readTableConf{} |
| t.customizeReadSrc(conf) |
| |
| for _, o := range options { |
| o.customizeRead(&conf.paging) |
| } |
| |
| return newIterator(t.service, conf), nil |
| } |
| |
| func (conf *readQueryConf) fetch(ctx context.Context, s service, token string) (*readDataResult, error) { |
| return s.readQuery(ctx, conf, token) |
| } |
| |
| // Read fetches the results of a query job. |
| func (j *Job) Read(_ context.Context, options ...ReadOption) (*Iterator, error) { |
| conf := &readQueryConf{} |
| if err := j.customizeReadQuery(conf); err != nil { |
| return nil, err |
| } |
| |
| for _, o := range options { |
| o.customizeRead(&conf.paging) |
| } |
| |
| return newIterator(j.service, conf), nil |
| } |