clickhouse-cpp's Introduction

ClickHouse C++ client

C++ client for ClickHouse

NOTE: The library is no longer supported. Please use https://github.com/ClickHouse/clickhouse-cpp.

Supported data types

Array(T)
Date
DateTime([timezone]), DateTime64(N, [timezone])
Decimal32, Decimal64, Decimal128
Enum8, Enum16
FixedString(N)
Float32, Float64
IPv4, IPv6
Nullable(T)
String
Tuple
UInt8, UInt16, UInt32, UInt64, Int8, Int16, Int32, Int64

C++ version

Currently, minimal version of C++ standard is 17, for C++ 11 see 1.x release line.

Building

$ mkdir build .
$ cd build
$ cmake .. [-DBUILD_TESTS=ON]
$ make

Example

#include <clickhouse/client.h>

using namespace clickhouse;

/// Initialize client connection.
Client client(ClientOptions().SetHost("localhost"));

/// Create a table.
client.Execute("CREATE TABLE IF NOT EXISTS test.numbers (id UInt64, name String) ENGINE = Memory");

/// Insert some values.
{
    Block block;

    auto id = std::make_shared<ColumnUInt64>();
    id->Append(1);
    id->Append(7);

    auto name = std::make_shared<ColumnString>();
    name->Append("one");
    name->Append("seven");

    block.AppendColumn("id"  , id);
    block.AppendColumn("name", name);

    client.Insert("test.numbers", block);
}

/// Select values inserted in the previous step.
client.Select("SELECT id, name FROM test.numbers", [] (const Block& block)
    {
        for (size_t i = 0; i < block.GetRowCount(); ++i) {
            std::cout << block[0]->As<ColumnUInt64>()->At(i) << " "
                      << block[1]->As<ColumnString>()->At(i) << "\n";
        }
    }
);

/// Delete table.
client.Execute("DROP TABLE test.numbers");

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