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41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#include <Storages/StorageMySQL.h>
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#include <Storages/transformQueryForExternalDatabase.h>
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#include <Dictionaries/MySQLBlockInputStream.h>
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namespace DB
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{
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StorageMySQL::StorageMySQL(
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const std::string & name,
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const std::string & host,
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UInt16 port,
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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 std::string & user,
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const std::string & password,
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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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, pool(remote_database_name, host, user, password, port)
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{
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}
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BlockInputStreams StorageMySQL::read(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)
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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<MySQLBlockInputStream>(pool.Get(), query, getSampleBlock(), max_block_size) };
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}
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}
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