PHP ClickHouse Client over HTTP
MIT License
The library is trying not to hide any ClickHouse HTTP interface specific details. That said everything is as much transparent as possible and so object-oriented API is provided without inventing own abstractions. Naming used here is the same as in ClickHouse docs.
composer require simpod/clickhouse-client
<?php
use Http\Client\Curl\Client;
use Nyholm\Psr7\Factory\Psr17Factory;
use SimPod\ClickHouseClient\Client\PsrClickHouseClient;
use SimPod\ClickHouseClient\Client\Http\RequestFactory;
$psr17Factory = new Psr17Factory;
$clickHouseClient = new PsrClickHouseClient(
new Client(),
new RequestFactory(
$psr17Factory,
$psr17Factory
),
[],
new DateTimeZone('UTC')
);
Configure HTTP Client
As said in ClickHouse HTTP Interface spec, we use headers to auth and e.g. set default database via query.
framework:
http_client:
scoped_clients:
click_house.client:
base_uri: '%clickhouse.endpoint%'
headers:
'X-ClickHouse-User': '%clickhouse.username%'
'X-ClickHouse-Key': '%clickhouse.password%'
query:
database: '%clickhouse.database%'
SimPod\ClickHouseClient\Client\Http\LoggerPlugin
is available to be used with HTTPlug PluginClient.
This is the
<?php
declare(strict_types=1);
namespace Cdn77\Mon\Core\Infrastructure\Symfony\Service\ClickHouse;
use Http\Client\Common\PluginClient;
use SimPod\ClickHouseClient\Client\Http\LoggerPlugin;
use SimPod\ClickHouseClient\Logger\SqlLogger;
use Symfony\Component\HttpClient\HttplugClient;
use Symfony\Contracts\HttpClient\HttpClientInterface;
final class HttpClientFactory
{
public function __construct(private HttpClientInterface $clickHouseClient, private SqlLogger $sqlLogger)
{
}
public function create() : PluginClient
{
return new PluginClient(
new HttplugClient($this->clickHouseClient),
[new LoggerPlugin($this->sqlLogger)]
);
}
}
ClickHouse does not have date times with timezones. Therefore you need to normalize DateTimes' timezones passed as parameters to ensure proper input format.
Following would be inserted as 2020-01-31 01:00:00
into ClickHouse.
new DateTimeImmutable('2020-01-31 01:00:00', new DateTimeZone('Europe/Prague'));
If your server uses UTC
, the value is incorrect for you actually need to insert 2020-01-31 00:00:00
.
Time zone normalization is enabled by passing DateTimeZone
into PsrClickHouseClient
constructor.
new PsrClickHouseClient(..., new DateTimeZone('UTC'));
The library does not implement it's own HTTP. That has already been done via PSR-7, PSR-17 and PSR-18. This library respects it and allows you to plug your own implementation (eg. HTTPPlug or Guzzle).
Recommended are composer require nyholm/psr7
for PSR-17 and composer require php-http/curl-client
for Curl PSR-18 implementation (used in example above).
ClickHouseClient::select()
Intended for SELECT
and SHOW
queries.
Appends FORMAT
to the query and returns response in selected output format:
<?php
use SimPod\ClickHouseClient\Client\ClickHouseClient;
use SimPod\ClickHouseClient\Format\JsonEachRow;
use SimPod\ClickHouseClient\Output;
/** @var ClickHouseClient $client */
/** @var Output\JsonEachRow $output */
$output = $client->select(
'SELECT * FROM table',
new JsonEachRow(),
['force_primary_key' => 1]
);
ClickHouseClient::selectWithParams()
Same as ClickHouseClient::select()
except it also allows parameter binding.
<?php
use SimPod\ClickHouseClient\Client\ClickHouseClient;
use SimPod\ClickHouseClient\Format\JsonEachRow;
use SimPod\ClickHouseClient\Output;
/** @var ClickHouseClient $client */
/** @var Output\JsonEachRow $output */
$output = $client->selectWithParams(
'SELECT * FROM :table',
['table' => 'table_name'],
new JsonEachRow(),
['force_primary_key' => 1]
);
ClickHouseClient::insert()
<?php
use SimPod\ClickHouseClient\Client\ClickHouseClient;
/** @var ClickHouseClient $client */
$client->insert('table', $data, $columnNames);
If $columnNames
is provided and is key->value array column names are generated based on it and values are passed as parameters:
$client->insert( 'table', [[1,2]], ['a' => 'Int8, 'b' => 'String'] );
generates INSERT INTO table (a,b) VALUES ({p1:Int8},{p2:String})
and values are passed along the query.
If $columnNames
is provided column names are generated based on it:
$client->insert( 'table', [[1,2]], ['a', 'b'] );
generates INSERT INTO table (a,b) VALUES (1,2)
.
If $columnNames
is omitted column names are read from $data
:
$client->insert( 'table', [['a' => 1,'b' => 2]]);
generates INSERT INTO table (a,b) VALUES (1,2)
.
Column names are read only from the first item:
$client->insert( 'table', [['a' => 1,'b' => 2], ['c' => 3,'d' => 4]]);
generates INSERT INTO table (a,b) VALUES (1,2),(3,4)
.
If not provided they're not passed either:
$client->insert( 'table', [[1,2]]);
generates INSERT INTO table VALUES (1,2)
.
<?php
use SimPod\ClickHouseClient\Sql\SqlFactory;
use SimPod\ClickHouseClient\Sql\ValueFormatter;
$sqlFactory = new SqlFactory(new ValueFormatter());
$sql = $sqlFactory->createWithParameters(
'SELECT :param',
['param' => 'value']
);
This produces SELECT 'value'
and it can be passed to ClickHouseClient::select()
.
Supported types are:
\DateTime
is not supported because ValueFormatter
might modify its timezone so it's not considered safe)__toString()
[!TIP] Official docs
<?php
use SimPod\ClickHouseClient\Client\PsrClickHouseClient;
$client = new PsrClickHouseClient(...);
$output = $client->selectWithParams(
'SELECT {p1:String}',
['param' => 'value']
);
All types are supported (except AggregateFunction
, SimpleAggregateFunction
and Nothing
by design).
You can also pass DateTimeInterface
into Date*
types or native array into Array
, Tuple
, Native
and Geo
types
To represent complex expressions there's SimPod\ClickHouseClient\Sql\Expression
class. When passed to SqlFactory
its value gets evaluated.
To pass eg. UUIDStringToNum('6d38d288-5b13-4714-b6e4-faa59ffd49d8')
to SQL:
<?php
use SimPod\ClickHouseClient\Sql\Expression;
Expression::new("UUIDStringToNum('6d38d288-5b13-4714-b6e4-faa59ffd49d8')");
<?php
use SimPod\ClickHouseClient\Sql\ExpressionFactory;
use SimPod\ClickHouseClient\Sql\ValueFormatter;
$expressionFactory = new ExpressionFactory(new ValueFormatter());
$expression = $expressionFactory->templateAndValues(
'UUIDStringToNum(%s)',
'6d38d288-5b13-4714-b6e4-faa59ffd49d8'
);
There are handy queries like getting database size, table list, current database etc.
To prevent Client API pollution, those are extracted into Snippets.
Example to obtain current database name:
<?php
use SimPod\ClickHouseClient\Snippet\CurrentDatabase;
$currentDatabaseName = CurrentDatabase::run($client);