mongo shell 脚本不允许我包含“use”

发布于 2024-12-22 11:15:07 字数 768 浏览 0 评论 0原文

Windows XP 机器上的 32 位 mongo 2.0.1

//script filename: test.js  (one line shell script file to store a person)
db.cTest.save({Name: "Fred", Age:21});

通过输入以下 2 个 shell 命令针对数据库 dbTest 运行：

    > use dbTest
    switched to dbTest
    > load("test.js")

到目前为止，一切顺利。

但是，如果我尝试在脚本中包含“use”语句，它就会失败：

//script filename: test.js  (including "use" statement)
use dbTest;
db.cTest.save({Name: "Fred", Age:21});

失败，错误消息如下：

    > load("test.js")
    SyntaxError: missing ; before statement
    Mon Dec 19 11:56:31: Error: error loading js file temp.js (shell):1

在 test.js 中添加或删除分号似乎并不重要。

那么如何将“use”指令放入 mongo shell 脚本中呢？

原文

32-bit mongo 2.0.1 on a windows XP machine

//script filename: test.js  (one line shell script file to store a person)
db.cTest.save({Name: "Fred", Age:21});

run against database dbTest by entering the following 2 shell commands:

    > use dbTest
    switched to dbTest
    > load("test.js")

So far, so good.

But if I try and include the "use" statement in the script it fails:

//script filename: test.js  (including "use" statement)
use dbTest;
db.cTest.save({Name: "Fred", Age:21});

fails with error msg as follows:

    > load("test.js")
    SyntaxError: missing ; before statement
    Mon Dec 19 11:56:31: Error: error loading js file temp.js (shell):1

Adding or removing semicolons to test.js doesn't seem to matter.

So how do you put a "use" directive into a mongo shell script?

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靖瑶 2024-12-29 11:15:07

在 mongo 脚本中，您可以使用 db.getSiblingDB('new_db_name') 来获取新数据库的引用。因此，不必在命令行中给出数据库名称。您可以使用 script.js：

db = db.getSiblingDB('new_db_name');
print(db);

// the rest of your code for database "new_db_name"

该脚本的输出为（使用 mongo script.js 调用）：

MongoDB shell version: 2.2.2
connecting to: test
sag

In a mongo script you can use the db.getSiblingDB('new_db_name') to get a reference of a new database. So, it it not mandatory to give the database name in the command line. You can use the script.js:

db = db.getSiblingDB('new_db_name');
print(db);

// the rest of your code for database "new_db_name"

and the output of this script is (invoked with mongo script.js):

MongoDB shell version: 2.2.2
connecting to: test
sag

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木森分化 2024-12-29 11:15:07

http://www.mongodb.org/display/DOCS/Scripting+the+shell

使用数据库名称
该命令在脚本模式下不起作用。相反，您需要在连接中显式定义数据库（上例中的 /dbname）。
或者，您也可以在脚本中创建连接：
db2 = connect("服务器:27017/otherdbname")

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圈圈圆圆圈圈 2024-12-29 11:15:07

好吧，不幸的是“load('file.js')”和“mongo file.js”实际上并没有使用与交互式 mongo shell 相同的脚本解释器。在脚本中显式打开连接可能违反 DRY 原则，因为 mongo 已经知道该信息。不过，有效的方法是将文件通过管道传输到 mongo 中，而不是在命令行上传递其名称：

mongo <file.js

Well, it still is unfortunate that "load('file.js')" and "mongo file.js" don't actually use the same script interpreter as the interactive mongo shell. Opening the connection explicitly in the script is potentially a violation of the DRY principle because mongo already knows that information. What does work, though, is piping the file into mongo rather than passing its name on the command line: