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[英]How to update multiple users from an administrator user in parse.com for android app
[英]How can I batch update all objects in User class (Parse.com, Android)?
我最初犯了一個錯誤,忘了在用戶注冊時初始化我的Array字段(設計),所以在我的Parse儀表板中,行顯示為(undefined)
,我希望它們是[]
。 我必須為大約5000個用戶執行此操作。 我嘗試了以下代碼:
var query = new Parse.Query("User");
query.equalTo("designs", "(undefined)");
query.each(function(obj) {
obj.set("designs", "[]");
return obj.save();
}).then(function() {
// All objects updated.
}, function(err) {
console.log(err);
});
我認為(undefined)
應該是別的東西,但我不確定是什么,因為它可能不是String。 我怎么解決這個問題?
更新:第二次嘗試。 這越來越近了嗎?
private void updateAllRows(final int skip) {
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.setLimit(500);
query.setSkip(skip);
query.whereDoesNotExist("designs");
query.findInBackground(new FindCallback<ParseUser>() {
@Override
public void done(List<ParseUser> results, ParseException e) {
if (results.size() > 0) {
// The query was successful.
for (int i = 0; i < results.size(); i++) {
ParseUser user = results.get(i);
String[] designs = new String[0];
user.put("designs", Arrays.asList(designs));
try {
ParseUser.saveAll(results);
if (results.size() >= 500) {
updateAllRows(skip + 500); // make a recursion call with different skip value
}
} catch (ParseException e1) {
e1.printStackTrace();
}
}
Log.d(getClass().toString(), ": The batch job was successfully completed.");
} else {
// The query was unsuccessful.
Log.d(getClass().toString(), ": The batch job was not successful.");
}
}
});
}
我在我的類的onCreate方法中使用以下函數調用上面的函數:
int skip = 0;
updateAllRows(skip);
這是不使用雲代碼的最佳方法嗎?
錯誤:
08-08 12:38:43.034 24003-24053/? E/HttpOperation: [luq{checkandengageuser, getmobileexperiments}] Unexpected exception
java.io.IOException: 1 of 2 operations in the batch failed
at luj.a(PG:268)
at lth.o(PG:10642)
at ltc.a(PG:1402)
at lth.i(PG:154)
at ly.f(PG:51849)
at dsr.a(PG:1255)
at dsr.a(PG:20077)
at dsr.a(PG:706)
at dss.run(PG:1548)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
JavaScript版本 1.您可以使用Parse.Object.saveAll在一個服務調用中保存多個對象2.您必須使用限制和跳過 ,以便一次為500(或更少)項目執行此操作。 3.你需要使用query.doesNotExist(“designs”); 以獲取設計列中包含undefined的所有項目
function updateAllRows(skip) { var query = new Parse.Query(Parse.User); query.limit(500); query.skip(skip); // get recors where designs is not exist or is undefined query.doesNotExist("designs"); query.find().then(function(results) { // if we got results then change the designs property if (results.length > 0) { for (var i = 0; i < results.length; i++) { var item = results[i]; item.set("designs", []); } Parse.Object.saveAll(results).then(function() { // if we got 500 or more results then we know // that we have more results // otherwise we finish if (results.length >= 500) { updateAllRows(skip + 500); // make a recursion call with different skip value } }, function(err) { // error occured }); } }, function(error) { // error occured while trying to fetch data }); };
Android Java版
private void updateAllRows(final int skip){
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.setLimit(500);
query.setSkip(skip);
query.whereDoesNotExist("designs");
query.findInBackground(new FindCallback<ParseUser>() {
@Override
public void done(final List<ParseUser> users, ParseException e) {
if (e == null){
for (ParseUser user : users){
user.put("designs",new ArrayList<>());
}
// save all objects in one server call
ParseObject.saveAllInBackground(users, new SaveCallback() {
@Override
public void done(ParseException e) {
if (e == null){
if (users.size() >= 500){
updateAllRows(skip + 500);
}
} else {
// error while saving objects
}
}
});
}
}
});
}
}
BTW! 您還可以在雲代碼中創建雲功能,並從客戶端觸發此功能
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