ClickHouse/src/Storages/StorageXDBC.h

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#pragma once
#include <Storages/StorageURL.h>
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#include <BridgeHelper/XDBCBridgeHelper.h>
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namespace Poco
{
class Logger;
}
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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:
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Pipe read(
const Names & column_names,
const StorageSnapshotPtr & storage_snapshot,
SelectQueryInfo & query_info,
ContextPtr context,
QueryProcessingStage::Enum processed_stage,
size_t max_block_size,
size_t num_streams) override;
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StorageXDBC(
const StorageID & table_id_,
const std::string & remote_database_name,
const std::string & remote_table_name,
ColumnsDescription columns_,
ConstraintsDescription constraints_,
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const String & comment,
ContextPtr context_,
BridgeHelperPtr bridge_helper_);
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SinkToStoragePtr write(const ASTPtr & query, const StorageMetadataPtr & /*metadata_snapshot*/, ContextPtr context) override;
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std::string getName() const override;
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private:
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 StorageSnapshotPtr & storage_snapshot,
const SelectQueryInfo & query_info,
ContextPtr 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,
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const ColumnsDescription & columns_description,
const SelectQueryInfo & query_info,
ContextPtr context,
QueryProcessingStage::Enum & processed_stage,
size_t max_block_size) const override;
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Block getHeaderBlock(const Names & column_names, const StorageSnapshotPtr & storage_snapshot) const override;
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bool supportsSubsetOfColumns() const override;
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};
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}