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result_helpers.go
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/
result_helpers.go
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/*
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* 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 neo4j
import "fmt"
// Single returns one and only one record from the result stream. Any error passed in
// or reported while navigating the result stream is returned without any conversion.
// If the result stream contains zero or more than one records error is returned.
// record, err := neo4j.Single(session.Run(...))
func Single(result Result, err error) (*Record, error) {
if err != nil {
return nil, err
}
return result.Single()
}
// Collect loops through the result stream, collects records into a slice and returns the
// resulting slice. Any error passed in or reported while navigating the result stream is
// returned without any conversion.
// records, err := neo4j.Collect(session.Run(...))
func Collect(result Result, err error) ([]*Record, error) {
if err != nil {
return nil, err
}
return result.Collect()
}
// AsRecords passes any existing error or casts from to a slice of records.
// Use in combination with Collect and transactional functions:
// records, err := neo4j.AsRecords(session.ReadTransaction(func (tx neo4j.Transaction) {
// return neo4j.Collect(tx.Run(...))
// }))
func AsRecords(from interface{}, err error) ([]*Record, error) {
if err != nil {
return nil, err
}
recs, ok := from.([]*Record)
if !ok {
return nil, &UsageError{
Message: fmt.Sprintf("Expected type []*Record, not %T", from),
}
}
return recs, nil
}
// AsRecord passes any existing error or casts from to a record.
// Use in combination with Single and transactional functions:
// record, err := neo4j.AsRecord(session.ReadTransaction(func (tx neo4j.Transaction) {
// return neo4j.Single(tx.Run(...))
// }))
func AsRecord(from interface{}, err error) (*Record, error) {
if err != nil {
return nil, err
}
rec, ok := from.(*Record)
if !ok {
return nil, &UsageError{
Message: fmt.Sprintf("Expected type *Record, not %T", from),
}
}
return rec, nil
}