C++客户端对mongodb的调用语法

SQL Statement 

Mongo Query Language Statement 

C++客户端调用语法

using namespace bson;

DBClientConnection c;

c.connect("somehost");

CREATE TABLE USERS (aNumber, bNumber)

db.createCollection("mycoll")

INSERT INTO USERS VALUES(1,1)

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

// GENOID is optional. if not done by client, server will add an _id

c.insert("mydb.users", BSON(GENOID<<"a"<<1<<"b"<<1));

// then optionally:

string err = c.getLastError();

SELECT a,b FROM users

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

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", Query(), 0, 0, BSON("a"<<1<<"b"<<1));

SELECT * FROM users

db.users.find()

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", Query());

SELECT * FROM users WHERE age=33

db.users.find({age:33})

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", QUERY("age"<<33))

// or:

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", BSON("age"<<33))

SELECT a,b FROM users WHERE age=33

db.users.find({age:33}, {a:1,b:1})

SELECT * FROM users WHERE age=33 ORDER BY name

db.users.find({age:33}).sort({name:1})

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", QUERY("age"<<33).sort("name"));

SELECT * FROM users WHERE age>33

db.users.find({'age':{$gt:33}})})

SELECT * FROM users WHERE age<33

db.users.find({'age':{$lt:33}})})

SELECT * FROM users WHERE name LIKE"%Joe%"

db.users.find({name:/Joe/})

SELECT * FROM users WHERE name LIKE"Joe%"

db.users.find({name:/^Joe/})

SELECT * FROM users WHERE age>33 AND age<=40

db.users.find({'age':{$gt:33,$lte:40}})})

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", QUERY("age"<<GT<<33<<LTE<<40));

SELECT * FROM users ORDER BY name DESC

db.users.find().sort({name:-1})

SELECT * FROM users WHERE a=1 and b='q'

db.users.find({a:1,b:'q'})

SELECT * FROM users LIMIT 10 SKIP 20

db.users.find().limit(10).skip(20)

auto_ptr<DBClientCursor> cursor = c.query("mydb.users", Query(), 10, 20);

SELECT * FROM users WHERE a=1 or b=2

db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )

SELECT * FROM users LIMIT 1

db.users.findOne()

bo obj = c.findOne("mydb.users", Query());

SELECT DISTINCT last_name FROM users

db.users.distinct('last_name')

// no helper for distinct in c++ driver, so send command manually

bo cmdResult;

bool ok = c.runCommand("mydb", BSON("distinct"<<"users"<<key<<"last_name"), cmdResult);

list<bo> results;

cmdResult["values"].Obj().Vals(results);

SELECT COUNT(*y)

FROM users

db.users.count()

SELECT COUNT(*y)

FROM users where AGE > 30

db.users.find({age: {'$gt': 30}}).count()

unsigned long long n = c.count("mydb.users", QUERY("age:"<<GT<<30));

SELECT COUNT(AGE) from users

db.users.find({age: {'$exists':true}}).count()

CREATE INDEX myindexname ON users(name)

db.users.ensureIndex({name:1})

c.ensureIndex("mydb.users", BSON("name"<<1));

CREATE INDEX myindexname ON users(name,ts DESC)

db.users.ensureIndex({name:1,ts:-1})

EXPLAIN SELECT * FROM users WHERE z=3

db.users.find({z:3}).explain()

UPDATE users SET a=1 WHERE b='q'

db.users.update({b:'q'}, {$set:{a:1}},false, true)

UPDATE users SET a=a+2 WHERE b='q'

db.users.update({b:'q'}, {$inc:{a:2}},false, true)

c.update("mydb.users", QUERY("b"<<"q"), BSON("$inc"<<BSON("a"<<2)), false, true);

// then optionally:

string err = c.getLastError();

bool ok = err.empty();

DELETE FROM users WHERE z="abc"

db.users.remove({z:'abc'});

c.remove("mydb.users", QUERY("z"<<"abc"));

// then optionally:

string err = c.getLastError();