如何在mongo控制台中更新日期字段? [英] How to update date field in mongo console?

问题描述

例如，我想将所有记录更新为"2012-01-01"(时间":ISODate("2011-12-31T13:52:40Z")).

For example I want to update all records to '2012-01-01' ( "time" : ISODate("2011-12-31T13:52:40Z") ).

db.test.update( { time : '2012-01-01' }, false, true  )

返回错误:

Assert failed : need an object
Error("Printing Stack Trace")@:0
()@shell/utils.js:35
("assert failed : need an object")@shell/utils.js:46
(false,"need an object")@shell/utils.js:54
([object Object],false,true)@shell/collection.js:189
@(shell):1

Wed Jan 11 17:52:35 uncaught exception: assert failed : need an object

推荐答案

您需要创建一个新的ISODate对象，如下所示:

You need to create a new ISODate object like this:

db.test.insert({"Time" : new ISODate("2012-01-10") });

对于更新和查询都是如此.请注意，您的查询语法不正确，应该是

This is true both for updates and for queries. Note that your query syntax is incorrect, it should be

db.test.update({ criteria }, { newObj }, upsert, multi);

例如，要更新所有对象，请考虑

For example, to update all objects, consider

db.test.update( {}, { $set : { "time" : new ISODate("2012-01-11T03:34:54Z") } }, true, true);

还请注意，这与

db.test.update( {}, { "time" : new ISODate("2012-01-11T03:34:54Z") }, true, false);

因为后者将替换对象，而不是将新字段添加到现有文档或更新现有字段.在此示例中，我将最后一个参数更改为false，因为多重更新仅适用于$运算符.

because the latter will replace the object, rather than add a new field to the existing document or updating the existing field. In this example, I changed the last parameter to false, because multi updates only work with $ operators.

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