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42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
#include <Common/PocoSessionPoolHelpers.h>
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#include <Storages/transformQueryForExternalDatabase.h>
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#include <Storages/StorageODBC.h>
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#include <Dictionaries/ODBCBlockInputStream.h>
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namespace DB
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{
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StorageODBC::StorageODBC(
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const std::string & name,
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const std::string & connection_string,
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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 NamesAndTypesList & columns)
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: name(name)
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, remote_database_name(remote_database_name)
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, remote_table_name(remote_table_name)
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, columns(columns)
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{
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pool = createAndCheckResizePocoSessionPool([&]
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{
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return std::make_shared<Poco::Data::SessionPool>("ODBC", connection_string);
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});
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}
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BlockInputStreams StorageODBC::read(
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const Names & column_names,
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const SelectQueryInfo & query_info,
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const Context & 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*/)
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{
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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String query = transformQueryForExternalDatabase(*query_info.query, columns, remote_database_name, remote_table_name, context);
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return { std::make_shared<ODBCBlockInputStream>(pool->get(), query, getSampleBlock(), max_block_size) };
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}
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}
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