global class BatchSync implements Database.Batchable<sObject>, Database.AllowsCallouts { public String query = 'Select ID, Name from Account'; global Database.QueryLocator start(Database.BatchableContext BC) { return Database.getQueryLocator(query); } global void execute(Database.BatchableContext BC, List<Account> records) { String endpoint; for ( integer i = 0; i< records.size(); i++ ){ try { HttpRequest req = new HttpRequest(); HttpResponse res = new HttpResponse(); Http http = new Http(); // Set values to Params endpoint = 'Your endpoint'; req.setHeader('Authorization', header); req.setHeader('Content-Type', 'application/json'); req.setEndpoint(endpoint); req.setMethod('POST'); req.setBody('Information you wanna send'); req.setCompressed(true); // This is imp according to SF, but please check if // the webservice accepts the info. Mine did not :P // Had to set it to false if (!Test.isRunningTest()) { res = http.send(req); String sJson = res.getBody(); System.debug('Str:' + res.getBody()); } // now do what u want to with response. } catch (Exception e) { System.debug('Error:' + e.getMessage() + 'LN:' + e.getLineNumber() ); } } } global void finish(Database.BatchableContext BC){ } }
BatchSync BS = new BatchSync();
Database.executeBatch(BS,10); // you can also do less than 10
You can also take help from these link
1-https://developer.salesforce.com/forums/?id=906F0000000kK6VIAU
2-http://www.forcedisturbances.com/2012/03/caching-data-from-googles-geocoding.html
http://www.platforce.org/batch-apex.html
https://www.biswajeetsamal.com/blog/batch-apex-with-webservice-callout/
global class batchAccountUpdate implements Database.Batchable<sObject>, Database.AllowsCallouts{
global Database.QueryLocator start(Database.BatchableContext BC)
{
string obj = 'ACA';
String query = 'Select Id, CreatedDate, CreatedBy.Name, Attest_ID__c from Case where Ticket_Type__c = :obj';
return Database.getQueryLocator(query);
}
global void execute(Database.BatchableContext BC, List<Account> scope)
{
List<Voice_File_Loader__c> searchVFL = [Select Id, Call_Date_Time__c, End_Window__c, Agent_Name__c, Voice_File_Location__c from Voice_File_Loader__c];
for (Account checkCase : scope){
for (Voice_File_Loader__c matchVFL :searchVFL){
boolean after = (checkCase.CreatedDate >= matchVFL.Call_Date_Time__c);
boolean before = (checkCase.CreatedDate <= matchVFL.End_Window__c);
boolean timeCheck = (after && before);
boolean nameCheck = (checkCase.CreatedBy.Name.equalsIgnoreCase(matchVFL.Agent_Name__c));
if (timeCheck && nameCheck){
Attachment att = new Attachment();
Http binding = new Http();
HttpRequest req = new HttpRequest();
req.setMethod('GET');
req.setEndpoint(matchVFL.Voice_File_Location__c);
HttpResponse res = binding.send(req);
Blob b = res.getbodyasblob();
att.name = 'Voice Attestation.wav';
att.body = b;
att.parentid = checkCase.Id;
system.debug('#############'+ att);
insert att;
delete matchVFL;
}
}
}
}
global void finish(Database.BatchableContext BC)
{
}
batchAccountUpdate a = new batchAccountUpdate(); database.executebatch(a,10);
global class AccountBatchApex implements Database.Batchable<sObject>, Database.AllowsCallouts{
global Database.QueryLocator start(Database.BatchableContext bc){
String soqlQuery = 'SELECT Name, AccountNumber, Type From Account';
return Database.getQueryLocator(soqlQuery);
}
global void execute(Database.BatchableContext bc, List<Account> scope){
for (Account acc : scope){
if(acc.Type.equals('Customer - Direct')){
try{
HttpRequest request = new HttpRequest();
HttpResponse response = new HttpResponse();
Http http = new Http();
String username = 'YourUsername';
String password = 'YourPassword';
Blob headerValue = Blob.valueOf(username + ':' + password);
String authorizationHeader = 'BASIC ' + EncodingUtil.base64Encode(headerValue);
request.setHeader('Authorization', authorizationHeader);
request.setHeader('Content-Type', 'application/json');
request.setEndpoint('Your Endpoint URL');
request.setMethod('POST');
request.setBody('Information to Send');
response = http.send(request);
if (response.getStatusCode() == 200) {
String jsonResponse = response.getBody();
System.debug('Response-' + jsonResponse);
}
}
catch(Exception){
System.debug('Error-' + e.getMessage());
}
}
}
}
global void finish(Database.BatchableContext bc){
}
}
https://blogs.absyz.com/2017/12/11/making-callouts-with-batch-apex-for-data-of-over-12-mb/
global class mybatchclass Implements Database.Batchable <sObject>,database.stateful,database.allowcallouts {
//variable to be used in SOQL
public Date today = system.today();
public set<ID> finalaccounts = new set<Id>();
public String SOQL = 'SELECT Id, Name, Type from Account where CreatedDate =: today' ;
// Start Method of Batch class
global Database.queryLocator start(Database.BatchableContext bc){
// Query the records
return Database.getQueryLocator(SOQL);
}
// Execute Method of Batch class
global void execute(Database.BatchableContext bc, List<Account> accountlist) {
// Iterate over the list of contacts and get their Account ids
for(Account cc:accountlist){
finalaccounts.add(cc.Id);
}
}
// Finish Method of Batch class. This is where you make the callout
global void finish(Database.BatchableContext bc) {
attachfiles.attachfilestoaccount(finalaccounts);
//make the callout here for getting the attachments data of size greater than 12 MB
}
}
// You can invoke the batch class from the anonymous debug window with the below syntax mybatchclass mb = new mybatchclass(); Database.executebatch(mb);
public class attachfiles(){ public static void attachfilestoaccount(set<id> listaccount) { // First set the callout parameters such as the authToken, Endpoint and the accessToken String authToken = 'test authorization token'; String authEndpoint = 'test authEndpoint'; String calloutEndpoint = 'test calloutEndpoint'; String accessToken = 'test_act'; // Now make the HTTP callout Http h1 = new Http(); HttpRequest hreq2 = new HttpRequest(); String dealId = ''; hreq2.setEndPoint(calloutEndpoint); hreq2.setMethod('POST'); hreq2.setHeader('Content-type','application/xml'); hreq2.setHeader('Authorization','Bearer'+' '+accessToken); hreq2.setTimeout(30000); hreq2.setBodyAsBlob(Blob.valueOf('testClass')); // Get the response which contains the attachment HttpResponse res = h1.send(hreq2); List<Attachment> atLst = new List<Attachment>(); for(Account acc:listaccount){ Attachment att1 = new Attachment(); att1.Body = Blob.valueOf(res.getbody()); att1.Name = String.valueOf('Response.txt'); att1.ParentId = acc.Id; atLst.add(att1); } // Finally, insert the list if(atLst.size()> 0) insert atLst; } }
http://mysfdc1.blogspot.com/2017/07/how-to-make-http-callouts-in-batch-class.html
global class BatchSync implements Database.Batchable<sObject>, Database.AllowsCallouts {
public String query = 'Select ID, Name from Account';
global Database.QueryLocator start(Database.BatchableContext BC) {
return Database.getQueryLocator(query);
}
global void execute(Database.BatchableContext BC, List<Account> records) {
String endpoint;
for ( integer i = 0; i< records.size(); i++ ){
try {
HttpRequest req = new HttpRequest();
HttpResponse res = new HttpResponse();
Http http = new Http();
// Set values to Params
endpoint = 'Your endpoint';
req.setHeader('Authorization', header);
req.setHeader('Content-Type', 'application/json');
req.setEndpoint(endpoint);
req.setMethod('POST');
req.setBody('Information you wanna send');
req.setCompressed(true); // This is imp according to SF, but please check if
// the webservice accepts the info. Mine did not :P
// Had to set it to false
if (!Test.isRunningTest()) {
res = http.send(req);
String sJson = res.getBody();
System.debug('Str:' + res.getBody());
}
// now do what u want to with response.
}
catch (Exception e) {
System.debug('Error:' + e.getMessage() + 'LN:' + e.getLineNumber() );
}
}
}
global void finish(Database.BatchableContext BC){
}
}
关于 异步处理的一些限制 ： http://www.salesforcenextgen.com/asynchronous-apex/