ClickHouse/dbms/src/Storages/StorageXDBC.h

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#pragma once
#include <Storages/StorageURL.h>
#include <ext/shared_ptr_helper.h>
#include <Common/XDBCBridgeHelper.h>
namespace DB
{
/** Implements storage in the XDBC database.
* Use ENGINE = xdbc(connection_string, table_name)
* Example ENGINE = odbc('dsn=test', table)
* Read only.
*/
class StorageXDBC : public IStorageURLBase
{
public:
BlockInputStreams read(const Names & column_names,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
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unsigned num_streams) override;
StorageXDBC(const std::string & database_name_,
const std::string & table_name_,
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const std::string & remote_database_name,
const std::string & remote_table_name,
const ColumnsDescription & columns_,
const Context & context_, BridgeHelperPtr bridge_helper_);
private:
BridgeHelperPtr bridge_helper;
std::string remote_database_name;
std::string remote_table_name;
Poco::Logger * log;
std::string getReadMethod() const override;
std::vector<std::pair<std::string, std::string>> getReadURIParams(const Names & column_names,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size) const override;
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std::function<void(std::ostream &)> getReadPOSTDataCallback(const Names & column_names,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size) const override;
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Block getHeaderBlock(const Names & column_names) const override;
std::string getName() const override;
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};
}