Methods方法

JavaScript constructor to instantiate a database connection from the mongo shell or from a JavaScript file.JavaScript构造函数，用于从mongo shell或JavaScript文件实例化数据库连接。

The Mongo() method has the following parameters:Mongo()方法有以下参数：

Specifies the maximum number of documents MongoDB can return to the client within each batch returned in a query result. 指定MongoDB在查询结果中返回的每个批中可以返回给客户端的最大文档数。By default, the initial batch size is the lesser of 101 documents or 16 mebibytes (MiB) worth of documents. Subsequent batches have a maximum size of 16 MiB. 默认情况下，初始批大小为101个文档或价值16兆字节（MiB）的文档中的较小者。后续批次的最大容量为16 MiB。This option can enforce a smaller limit than 16 MiB, but not a larger one. When set, the batchSize is the lesser of batchSize documents or 16 MiB worth of documents.此选项可以强制执行小于16 MiB的限制，但不能强制执行更大的限制。设置后，batchSize是batchSize文档或价值16 MiB的文档中的较小值。

A batchSize of 0 means that the cursor is established, but no documents are returned in the first batch.batchSize为0表示游标已建立，但第一批中没有返回文档。

The following example query returns results in batches of 100:以下示例查询以100个为一批返回结果：

db.myCollection.find().batchSize(100)

buildInfo()

Returns the following JSON-formatted document that describes your mongosh build and driver dependencies:返回以下JSON格式的文档，描述mongosh构建和驱动程序依赖关系：

{
  version: '1.10.1',
  distributionKind: 'packaged',
  buildArch: 'x64',
  buildPlatform: 'linux',
  buildTarget: 'unknown',
  buildTime: '2023-06-21T09:49:37.225Z',
  gitVersion: '05ad91b4dd40382a13f27abe1ae8c3f9f52a38f7',
  nodeVersion: 'v16.20.1',
  opensslVersion: '3.1.1',
  sharedOpenssl: true,
  runtimeArch: 'x64',
  runtimePlatform: 'darwin',
  deps: {
     nodeDriverVersion: '5.6.0',
     libmongocryptVersion: undefined,
     libmongocryptNodeBindingsVersion: undefined
   }
}

isInteractive()

load()

Loads and runs a JavaScript file in the shell.在shell中加载并运行JavaScript文件。

In mongosh, scripts loaded with the load() method support the __filename and __dirname Node.js variables. These variables return the file name and directory of the loaded script, respectively. The returned values are always absolute paths.在mongosh中，使用load()方法加载的脚本支持__filename和__dirname Node.js变量。这些变量分别返回加载脚本的文件名和目录。返回的值始终是绝对路径。

The legacy mongo shell cannot access a script's file name or directory in the load() method.旧版mongo shell无法在load()方法中访问脚本的文件名或目录。

print()

Print the specified text or variable. print() and printjson() are aliases for console.log().打印指定的文本或变量。print()和printjson()是console.log()的别名。

> print("hello world")
hello world

> x = "example text"
> print(x)
example text

quit()

sleep()

version()

Returns the status of the secondary members of the replica set.返回副本集次要成员的状态。

This is identical to the rs.printSecondaryReplicationInfo() method.这与rs.printSecondaryReplicationInfo()方法相同。

The following is an example output from the rs.printSecondaryReplicationInfo() method issued on a replica set with two secondary members:以下是在具有两个次要成员的副本集上发出的rs.printSecondaryReplicationInfo()方法的示例输出：

source: rs2.example.net:27017
{
  syncedTo: 'Tue Oct 13 2020  09:37:28 GMT-0700 (Pacific Daylight Time)',
  replLag: '0 secs (0 hrs) behind the primary '
}
---
source: rs3.example.net:27017
{
  syncedTo: 'Tue Oct 13 2020  09:37:28 GMT-0700 (Pacific Daylight Time)',
  replLag: '0 secs (0 hrs) behind the primary '
}

Returns the status of the secondary members of the replica set.返回副本集secondary成员的状态。

This is identical to the db.printSecondaryReplicationInfo() method.这与db.printSecondaryReplicationInfo()方法相同。

The following is an example output from the rs.printSecondaryReplicationInfo() method issued on a replica set with two secondary members:以下是在具有两个次要成员的副本集上发出的rs.printSecondaryReplicationInfo()方法的示例输出：

source: rs2.example.net:27017
{
  syncedTo: 'Tue Oct 13 2020 09:42:18 GMT-0700 (Pacific Daylight Time)',
  replLag: '0 secs (0 hrs) behind the primary '
}
---
source: rs3.example.net:27017
{
  syncedTo: 'Tue Oct 13 2020 09:42:18 GMT-0700 (Pacific Daylight Time)',
  replLag: '0 secs (0 hrs) behind the primary '
}

Returns a document that describes the role of the mongod instance.返回一个描述mongod实例角色的文档。

If the mongod is a member of a replica set, then the isWritablePrimary and secondary fields report if the instance is the primary or if it is a secondary member of the replica set.如果mongod是副本集的成员，那么isWritablePrimary和secondary字段会报告该实例是副本集中的primary成员还是secondary成员。

Returns information on whether the chunks of a sharded collection are balanced.返回有关分片集合的块是否平衡的信息。

Disables automatic chunk merges for a namespace.禁用命名空间的自动块合并。

Enables automatic chunk merges for a namespace.启用命名空间的自动块合并。

Enables the AutoMerger.启用自动合并。

Disables the AutoMerger.禁用自动合并。