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
|
#pragma once
#include <Poco/MongoDB/Connection.h>
#include <Storages/IStorage.h>
namespace DB
{
/* Implements storage in the MongoDB database.
* Use ENGINE = MongoDB(host:port, database, collection, user, password [, options]);
* Read only.
*/
class StorageMongoDB final : public IStorage
{
public:
StorageMongoDB(
const StorageID & table_id_,
const std::string & host_,
uint16_t port_,
const std::string & database_name_,
const std::string & collection_name_,
const std::string & username_,
const std::string & password_,
const std::string & options_,
const ColumnsDescription & columns_,
const ConstraintsDescription & constraints_,
const String & comment);
std::string getName() const override { return "MongoDB"; }
Pipe read(
const Names & column_names,
const StorageSnapshotPtr & storage_snapshot,
SelectQueryInfo & query_info,
ContextPtr context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
size_t num_streams) override;
SinkToStoragePtr write(
const ASTPtr & query,
const StorageMetadataPtr & /*metadata_snapshot*/,
ContextPtr context,
bool async_insert) override;
struct Configuration
{
std::string host;
UInt16 port;
std::string username;
std::string password;
std::string database;
std::string table;
std::string options;
};
static Configuration getConfiguration(ASTs engine_args, ContextPtr context);
private:
void connectIfNotConnected();
const std::string database_name;
const std::string collection_name;
const std::string username;
const std::string password;
const std::string uri;
std::shared_ptr<Poco::MongoDB::Connection> connection;
bool authenticated = false;
std::mutex connection_mutex; /// Protects the variables `connection` and `authenticated`.
};
}
|
