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43 lines
1.8 KiB
C++
43 lines
1.8 KiB
C++
#pragma once
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#include <DB/Core/QueryProcessingStage.h>
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#include <DB/DataStreams/BlockIO.h>
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namespace DB
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{
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/// Parse and execute a query.
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void executeQuery(
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ReadBuffer & istr, /// Where to read query from (and data for INSERT, if present).
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WriteBuffer & ostr, /// Where to write query output to.
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bool allow_into_outfile, /// If true and the query contains INTO OUTFILE section, redirect output to that file.
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Context & context, /// DB, tables, data types, storage engines, functions, aggregate functions...
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std::function<void(const String &)> set_content_type /// If non-empty callback is passed, it will be called with the Content-Type of the result.
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);
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/// More low-level function for server-to-server interaction.
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/// Prepares a query for execution but doesn't execute it.
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/// Returns a pair of block streams which, when used, will result in query execution.
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/// This means that the caller can to the extent control the query execution pipeline.
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///
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/// To execute:
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/// * if present, write INSERT data into BlockIO::out
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/// * then read the results from BlockIO::in.
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///
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/// If the query doesn't involve data insertion or returning of results, out and in respectively
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/// will be equal to nullptr.
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///
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/// Correctly formatting the results (according to INTO OUTFILE and FORMAT sections)
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/// must be done separately.
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BlockIO executeQuery(
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const String & query, /// Query text without INSERT data. The latter must be written to BlockIO::out.
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Context & context, /// DB, tables, data types, storage engines, functions, aggregate functions...
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bool internal = false, /// If true, this query is caused by another query and thus needn't be registered in the ProcessList.
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QueryProcessingStage::Enum stage = QueryProcessingStage::Complete /// To which stage the query must be executed.
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);
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}
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