ClickHouse/src/Storages/StoragePostgreSQL.h

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#pragma once
#if !defined(ARCADIA_BUILD)
#include "config_core.h"
#endif
#if USE_LIBPQXX
#include <ext/shared_ptr_helper.h>
#include <Interpreters/Context.h>
#include <Storages/IStorage.h>
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#include <DataStreams/IBlockOutputStream.h>
#include "pqxx/pqxx"
namespace DB
{
class StoragePostgreSQL final : public ext::shared_ptr_helper<StoragePostgreSQL>, public IStorage
{
friend struct ext::shared_ptr_helper<StoragePostgreSQL>;
public:
StoragePostgreSQL(
const StorageID & table_id_,
const std::string & remote_database_name_,
const std::string & remote_table_name_,
const String connection_str,
const ColumnsDescription & columns_,
const ConstraintsDescription & constraints_,
const Context & context_);
String getName() const override { return "PostgreSQL"; }
Pipe read(
const Names & column_names,
const StorageMetadataPtr & /*metadata_snapshot*/,
SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
unsigned num_streams) override;
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BlockOutputStreamPtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, const Context & context) override;
private:
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friend class PostgreSQLBlockOutputStream;
String remote_database_name;
String remote_table_name;
Context global_context;
std::shared_ptr<pqxx::connection> connection;
};
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class PostgreSQLBlockOutputStream : public IBlockOutputStream
{
public:
explicit PostgreSQLBlockOutputStream(
const StoragePostgreSQL & storage_,
const StorageMetadataPtr & metadata_snapshot_,
std::shared_ptr<pqxx::connection> connection_,
const std::string & remote_database_name_,
const std::string & remote_table_name_)
: storage(storage_)
, metadata_snapshot(metadata_snapshot_)
, connection(connection_)
, remote_database_name(remote_database_name_)
, remote_table_name(remote_table_name_)
{
}
Block getHeader() const override { return metadata_snapshot->getSampleBlock(); }
void writePrefix() override;
void write(const Block & block) override;
void writeSuffix() override;
const StoragePostgreSQL & storage;
private:
StorageMetadataPtr metadata_snapshot;
std::shared_ptr<pqxx::connection> connection;
std::string remote_database_name;
std::string remote_table_name;
std::unique_ptr<pqxx::work> work;
std::unique_ptr<pqxx::stream_to> stream_inserter;
};
}
#endif