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update_doc.go
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update_doc.go
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/**
* © Copyright IBM Corporation 2020, 2022. 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 main
import (
"encoding/json"
"fmt"
"github.com/IBM/cloudant-go-sdk/cloudantv1"
)
func main() {
// 1. Create a client with `CLOUDANT` default service name =============
client, err := cloudantv1.NewCloudantV1UsingExternalConfig(
&cloudantv1.CloudantV1Options{},
)
if err != nil {
panic(err)
}
// 2. Update the document ==============================================
exampleDbName := "orders"
exampleDocID := "example"
// Get the document if it previously existed in the database
document, getDocumentResponse, err := client.GetDocument(
client.NewGetDocumentOptions(
exampleDbName,
exampleDocID,
),
)
// =====================================================================
// Note: for response byte stream use:
/*
documentAsByteStream, getDocumentResponse, err := client.GetDocumentAsStream(
client.NewGetDocumentOptions(
exampleDbName,
exampleDocID,
),
)
*/
// =====================================================================
if err != nil {
if getDocumentResponse.StatusCode == 404 {
fmt.Printf("Cannot update document because "+
"either \"%s\" database or \"%s\" document was not found.\n",
exampleDbName,
exampleDocID)
} else {
panic(err)
}
}
if document != nil {
// Make some modification in the document content
// Add Bob Smith's address to the document
document.SetProperty("address", "19 Front Street, Darlington, DL5 1TY")
// Remove the joined property from document object
delete(document.GetProperties(), "joined")
// Update the document in the database
updateDocumentOptions := client.NewPostDocumentOptions(
exampleDbName,
).SetDocument(document)
// =================================================================
// Note: for request byte stream use:
/*
postDocumentOption := client.NewPostDocumentOptions(
exampleDbName,
).SetBody(documentAsByteStream)
*/
// =================================================================
updateDocumentResponse, _, err := client.PostDocument(
updateDocumentOptions,
)
// =================================================================
// Note: updating the document can also be done with the "PutDocument"
// function. DocID and Rev are required for an UPDATE operation
// but Rev can be provided in the document object too:
/*
updateDocumentOptions := client.NewPutDocumentOptions(
exampleDbName,
core.StringNilMapper(document.ID), // docID is a required parameter
).SetDocument(document) // Rev in the document object CAN replace below SetRev
updateDocumentOptions.SetRev(core.StringNilMapper(document.Rev))
updateDocumentResponse, _, err := client.PutDocument(
updateDocumentOptions,
)
*/
// =================================================================
if err != nil {
panic(err)
}
// Keeping track of the latest revision number of the document object
// is necessary for further UPDATE/DELETE operations:
document.Rev = updateDocumentResponse.Rev
// Print out the new document content
documentContent, _ := json.MarshalIndent(document, "", " ")
fmt.Printf("You have updated the document:\n%s\n", string(documentContent))
}
}