| // Copyright 2016 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 ( |
| "encoding/base64" |
| "fmt" |
| "reflect" |
| "time" |
| |
| bq "google.golang.org/api/bigquery/v2" |
| ) |
| |
| // See https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types#timestamp-type. |
| var timestampFormat = "2006-01-02 15:04:05.999999-07:00" |
| |
| var ( |
| int64ParamType = &bq.QueryParameterType{Type: "INT64"} |
| float64ParamType = &bq.QueryParameterType{Type: "FLOAT64"} |
| boolParamType = &bq.QueryParameterType{Type: "BOOL"} |
| stringParamType = &bq.QueryParameterType{Type: "STRING"} |
| bytesParamType = &bq.QueryParameterType{Type: "BYTES"} |
| timestampParamType = &bq.QueryParameterType{Type: "TIMESTAMP"} |
| ) |
| |
| var timeType = reflect.TypeOf(time.Time{}) |
| |
| func paramType(t reflect.Type) (*bq.QueryParameterType, error) { |
| switch t.Kind() { |
| case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint16, reflect.Uint32: |
| return int64ParamType, nil |
| case reflect.Float32, reflect.Float64: |
| return float64ParamType, nil |
| case reflect.Bool: |
| return boolParamType, nil |
| case reflect.String: |
| return stringParamType, nil |
| case reflect.Slice, reflect.Array: |
| if t.Kind() == reflect.Slice && t.Elem().Kind() == reflect.Uint8 { |
| return bytesParamType, nil |
| } |
| et, err := paramType(t.Elem()) |
| if err != nil { |
| return nil, err |
| } |
| return &bq.QueryParameterType{Type: "ARRAY", ArrayType: et}, nil |
| } |
| if t == timeType { |
| return timestampParamType, nil |
| } |
| return nil, fmt.Errorf("Go type %s cannot be represented as a parameter type", t) |
| } |
| |
| func paramValue(x interface{}) (bq.QueryParameterValue, error) { |
| // convenience function for scalar value |
| sval := func(s string) bq.QueryParameterValue { |
| return bq.QueryParameterValue{Value: s} |
| } |
| switch x := x.(type) { |
| case []byte: |
| return sval(base64.StdEncoding.EncodeToString(x)), nil |
| case time.Time: |
| return sval(x.Format(timestampFormat)), nil |
| } |
| t := reflect.TypeOf(x) |
| switch t.Kind() { |
| case reflect.Slice, reflect.Array: |
| var vals []*bq.QueryParameterValue |
| v := reflect.ValueOf(x) |
| for i := 0; i < v.Len(); i++ { |
| val, err := paramValue(v.Index(i).Interface()) |
| if err != nil { |
| return bq.QueryParameterValue{}, err |
| } |
| vals = append(vals, &val) |
| } |
| return bq.QueryParameterValue{ArrayValues: vals}, nil |
| } |
| return sval(fmt.Sprint(x)), nil |
| } |