1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
// Compile with: c++ --std=c++11 tutorial.cpp $(pkg-config --cflags --libs libmongocxx)
// The following is a formatted copy from the tutorial
// https://www.mongodb.com/docs/languages/cpp/cpp-driver/current/tutorial/.
#include <cstdint>
#include <iostream>
#include <vector>
#include <bsoncxx/builder/basic/document.hpp>
#include <bsoncxx/json.hpp>
#include <mongocxx/client.hpp>
#include <mongocxx/instance.hpp>
#include <mongocxx/uri.hpp>
#include <examples/macros.hh>
// Redefine assert after including headers. Release builds may undefine the assert macro and result
// in -Wunused-variable warnings.
#if defined(NDEBUG) || !defined(assert)
#undef assert
#define assert(stmt) \
do { \
if (!(stmt)) { \
std::cerr << "Assert on line " << __LINE__ << " failed: " << #stmt << std::endl; \
abort(); \
} \
} while (0)
#endif
using bsoncxx::builder::basic::kvp;
using bsoncxx::builder::basic::make_array;
using bsoncxx::builder::basic::make_document;
int EXAMPLES_CDECL main() {
mongocxx::instance instance{}; // This should be done only once.
mongocxx::uri uri("mongodb://localhost:27017");
mongocxx::client client(uri);
auto db = client["mydb"];
auto collection = db["test"];
// Create a Document
{
auto doc_value = make_document(
kvp("name", "MongoDB"),
kvp("type", "database"),
kvp("count", 1),
kvp("versions", make_array("v6.0", "v5.0", "v4.4", "v4.2", "v4.0", "v3.6")),
kvp("info", make_document(kvp("x", 203), kvp("y", 102))));
auto doc_view = doc_value.view();
auto element = doc_view["name"];
assert(element.type() == bsoncxx::type::k_string);
auto name = element.get_string().value; // For C++ driver version < 3.7.0, use get_utf8()
assert(name == "MongoDB");
}
// Insert One Document: { "i": 0 }
{
auto insert_one_result = collection.insert_one(make_document(kvp("i", 0)));
assert(insert_one_result); // Acknowledged writes return results.
auto doc_id = insert_one_result->inserted_id();
assert(doc_id.type() == bsoncxx::type::k_oid);
}
// Insert Multiple Documents: { "i": 1 } and { "i": 2 }
{
std::vector<bsoncxx::document::value> documents;
documents.push_back(make_document(kvp("i", 1)));
documents.push_back(make_document(kvp("i", 2)));
auto insert_many_result = collection.insert_many(documents);
assert(insert_many_result); // Acknowledged writes return results.
auto doc0_id = insert_many_result->inserted_ids().at(0);
auto doc1_id = insert_many_result->inserted_ids().at(1);
assert(doc0_id.type() == bsoncxx::type::k_oid);
assert(doc1_id.type() == bsoncxx::type::k_oid);
}
// Find a Single Document in a Collection
{
auto find_one_result = collection.find_one({});
if (find_one_result) {
// Do something with *find_one_result
}
assert(find_one_result);
}
// Find All Documents in a Collection
{
auto cursor_all = collection.find({});
for (auto doc : cursor_all) {
// Do something with doc
assert(doc["_id"].type() == bsoncxx::type::k_oid);
}
}
// Print All Documents in a Collection
{
auto cursor_all = collection.find({});
std::cout << "collection " << collection.name() << " contains these documents:" << std::endl;
for (auto doc : cursor_all) {
std::cout << bsoncxx::to_json(doc, bsoncxx::ExtendedJsonMode::k_relaxed) << std::endl;
}
std::cout << std::endl;
}
// Get A Single Document That Matches a Filter
{
auto find_one_filtered_result = collection.find_one(make_document(kvp("i", 0)));
if (find_one_filtered_result) {
// Do something with *find_one_filtered_result
}
}
// Get All Documents That Match a Filter
{
auto cursor_filtered = collection.find(make_document(kvp("i", make_document(kvp("$gt", 0), kvp("$lte", 2)))));
for (auto doc : cursor_filtered) {
// Do something with doc
assert(doc["_id"].type() == bsoncxx::type::k_oid);
}
}
// Update a Single Document
{
auto update_one_result = collection.update_one(
make_document(kvp("i", 0)), make_document(kvp("$set", make_document(kvp("foo", "bar")))));
assert(update_one_result); // Acknowledged writes return results.
assert(update_one_result->modified_count() == 1);
}
// Update Multiple Documents
{
auto update_many_result = collection.update_many(
make_document(kvp("i", make_document(kvp("$gt", 0)))),
make_document(kvp("$set", make_document(kvp("foo", "buzz")))));
assert(update_many_result); // Acknowledged writes return results.
assert(update_many_result->modified_count() == 2);
}
// Delete a Single Document
{
auto delete_one_result = collection.delete_one(make_document(kvp("i", 0)));
assert(delete_one_result); // Acknowledged writes return results.
assert(delete_one_result->deleted_count() == 1);
}
// Delete All Documents That Match a Filter
{
auto delete_many_result = collection.delete_many(make_document(kvp("i", make_document(kvp("$gt", 0)))));
assert(delete_many_result); // Acknowledged writes return results.
assert(delete_many_result->deleted_count() == 2);
}
// Create Indexes
{
auto index_specification = make_document(kvp("i", 1));
collection.create_index(std::move(index_specification));
}
// Drop collection to clean up.
collection.drop();
}
|
