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72 lines
2.0 KiB
C++
72 lines
2.0 KiB
C++
#pragma once
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#include <Storages/StorageURL.h>
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#include <Bridge/XDBCBridgeHelper.h>
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namespace Poco
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{
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class Logger;
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}
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namespace DB
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{
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/** Implements storage in the XDBC database.
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* Use ENGINE = xdbc(connection_string, table_name)
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* Example ENGINE = odbc('dsn=test', table)
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* Read only.
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*/
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class StorageXDBC : public IStorageURLBase
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{
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public:
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Pipe read(
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const Names & column_names,
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const StorageMetadataPtr & /*metadata_snapshot*/,
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SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum processed_stage,
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size_t max_block_size,
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unsigned num_streams) override;
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StorageXDBC(
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const StorageID & table_id_,
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const std::string & remote_database_name,
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const std::string & remote_table_name,
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const ColumnsDescription & columns_,
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const String & comment,
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ContextPtr context_,
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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:
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BridgeHelperPtr bridge_helper;
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std::string remote_database_name;
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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(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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const SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size) const override;
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std::function<void(std::ostream &)> getReadPOSTDataCallback(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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const SelectQueryInfo & query_info,
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ContextPtr context,
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QueryProcessingStage::Enum & processed_stage,
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size_t max_block_size) const override;
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Block getHeaderBlock(const Names & column_names, const StorageMetadataPtr & metadata_snapshot) const override;
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};
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}
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