ClickHouse/src/Storages/StorageXDBC.h

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#pragma once
#include <Storages/StorageURL.h>
#include <Common/XDBCBridgeHelper.h>
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namespace DB
{
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/** Implements storage in the XDBC database.
* Use ENGINE = xdbc(connection_string, table_name)
* Example ENGINE = odbc('dsn=test', table)
* Read only.
*/
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class StorageXDBC : public IStorageURLBase
{
public:
Pipes read(const Names & column_names,
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const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
unsigned num_streams) override;
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StorageXDBC(const StorageID & table_id_,
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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_);
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private:
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BridgeHelperPtr bridge_helper;
std::string remote_database_name;
std::string remote_table_name;
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Poco::Logger * log;
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std::string getReadMethod() const override;
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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;
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std::string getName() const override;
};
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}