foo.find( { a : 1 } ) list objects in foo where a == 1 it result of the last line evaluated; use to further iterate DBQuery.shellBatchSize = x set default number of items to display on shell exit quit the mongo shell > 这是MongoDB最顶层的命令列表,主要告诉我们管理数据库相关的...
MongoDB provides different kinds of functionality to the user; the find array is one of the functionalities that is provided by MongoDB. In the find array functionally we can find the required document as per our requirement. For the implementation of find array we use db.collectName. find (...
$in { <key>: { $in: [<value1>, <value2>, ... <valueN> ] } } 包含 db.col.find( { item : { $in: false } } ) where likes in () $nin { <key>: { $nin: [ <value1>, <value2> ... <valueN> ]} } 不包含 db.col.find( { item : { $nin: false } } ) where...
Here is the query to search in an array of objects in MongoDB. Case 1 When the given element is found. The query is as follows ? > db.searchArrayDemo.find({EmployeeDetails:{$elemMatch:{EmployeePerformanceArea : "C++", Year : 1998}}}).pretty(); The following is the output ? { "...
explain.queryPlanner.winningPlan.isMultiKey是否是Multikey,此处返回是false,如果索引建立在array上,此处将是true。 explain.queryPlanner.winningPlan.direction:此query的查询顺序,此处是forward,如果用了.sort({modify_time:-1})将显示backward。 explain.queryPlanner.winningPlan.indexBounds:winningplan所扫描的索引...
$nin Matches none of the values specified in an array.(不包含) 12.2.1、查询age是22的student信息 > db.student.find({ age:22 }) { "_id" : ObjectId("611b6ab90ad895f9d53f39d9"), "name" : "bill01", "age" : 22 } { "_id" : ObjectId("611b6cb00ad895f9d53f39da"), "nam...
{ "arrayFilters" : NumberLong(0), "failed" : NumberLong(0), "pipeline" : NumberLong(23063), "total" : NumberLong(511271) }, "usersInfo" : { "failed" : NumberLong(0), "total" : NumberLong(1) }, "whatsmyuri" : { "failed" : NumberLong(0), "total" : NumberLong(5) } }, "...
mongoTemplate.getCollection(“ foo”)。find()返回集合中的所有文档。 alldocs.toArray()返回一个DBObjects数组。 然后,我们将调用以下三种方法,我们将在下面分别进行回顾。 public Step step2(){ return stepBuilderFactory.get("step2") .tasklet(new Tasklet(){ ...
MongoDB コレクション名 collection True string コレクションの名前。 documents documents object アイテム 戻り値 テーブルを展開する 名前パス型説明 insertedIds insertedIds array of string insertedIds 複数のドキュメントを更新操作ID: UpdateMultipleDocuments updateMany...
var query = {array:{$in: ['second']},objectList: {$elemMatch: {toMatch: {$exists: true}}} } db.foo.update(query, {$set: {'objectList.$.toChange':10}}, {multi: true}) db.foo.find(query, {_id:0}) Returns: { "objectList" : [ ...