mongodb(基础用法)

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　　https://mongodb-documentation.readthedocs.org/en/latest/ecosystem/drivers.html#id2
　　https://mongodb-documentation.readthedocs.org/en/latest/ecosystem/drivers/cpp-to-sql-to-mongo-shell.html

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SQL tomongoShell to C++

MongoDB queries are expressed as JSON (BSON) objects. This quick reference chart shows examples as SQL, mongo shell syntax, and MongoDB C++ driver syntax.

A query expression in MongoDB (and other things, such as an index key pattern) is represented as BSON. In C++ you can use BSONObjBuilder (aka bson::bob) to build BSON objects, or the BSON() macro. The examples below assume a connection c already established:

using namespace bson;

DBClientConnection c;

c.connect("somehost");

Several of the C++ driver methods throw mongo::DBException, so you will want a try/catch statement as some level in your program. Also be sure to call c.getLastError() after writes to check the error code.

[table]

[tr]
[td]

SQL

[/td]
[td]

mongo Shell

[/td]
[td]

C++ Driver

[/td]
[/tr]


[tr]
[td]

INSERT INTO USERS

VALUES( 1, 1)

[/td]
[td]

db.users.insert( { a: 1, b: 1 } )

[/td]
[td]

// GENOID is optional. if not done by client,

// server will add an _id

c.insert("mydb.users",

  BSON(GENOID