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#pragma once
#include "block.h"
#include <util/generic/string.h>
#include <cstdint>
#include <functional>
#include <memory>
namespace NClickHouse {
/**
* Settings of individual query.
*/
struct TQuerySettings {
/// Максимальное количество потоков выполнения запроса. По-умолчанию - определять автоматически.
int MaxThreads = 0;
/// Считать минимумы и максимумы столбцов результата.
bool Extremes = false;
/// Тихо пропускать недоступные шарды.
bool SkipUnavailableShards = false;
/// Write statistics about read rows, bytes, time elapsed, etc.
bool OutputFormatWriteStatistics = true;
/// Use client timezone for interpreting DateTime string values, instead of adopting server timezone.
bool UseClientTimeZone = false;
// connect_timeout
// max_block_size
// distributed_group_by_no_merge = false
// strict_insert_defaults = 0
// network_compression_method = LZ4
// priority = 0
};
struct TException {
int Code = 0;
TString Name;
TString DisplayText;
TString StackTrace;
/// Pointer to nested exception.
std::unique_ptr<TException> Nested;
};
struct TProfile {
ui64 rows = 0;
ui64 blocks = 0;
ui64 bytes = 0;
ui64 rows_before_limit = 0;
bool applied_limit = false;
bool calculated_rows_before_limit = false;
};
struct TProgress {
ui64 rows = 0;
ui64 bytes = 0;
ui64 total_rows = 0;
};
class TQueryEvents {
public:
virtual ~TQueryEvents() {
}
/// Some data was received.
virtual void OnData(const TBlock& block) = 0;
virtual void OnServerException(const TException& e) = 0;
virtual void OnProfile(const TProfile& profile) = 0;
virtual void OnProgress(const TProgress& progress) = 0;
virtual void OnFinish() = 0;
};
using TExceptionCallback = std::function<void(const TException& e)>;
using TProfileCallback = std::function<void(const TProfile& profile)>;
using TProgressCallback = std::function<void(const TProgress& progress)>;
using TSelectCallback = std::function<void(const TBlock& block)>;
class TQuery: public TQueryEvents {
public:
TQuery();
TQuery(const char* query);
TQuery(const TString& query);
~TQuery();
///
inline TString GetText() const {
return Query_;
}
/// Set handler for receiving result data.
inline TQuery& OnData(TSelectCallback cb) {
SelectCb_ = cb;
return *this;
}
/// Set handler for receiving server's exception.
inline TQuery& OnException(TExceptionCallback cb) {
ExceptionCb_ = cb;
return *this;
}
/// Set handler for receiving a profile of query execution.
inline TQuery& OnProfile(TProfileCallback pb) {
ProfileCb_ = pb;
return *this;
}
/// Set handler for receiving a progress of query exceution.
inline TQuery& OnProgress(TProgressCallback cb) {
ProgressCb_ = cb;
return *this;
}
private:
void OnData(const TBlock& block) override {
if (SelectCb_) {
SelectCb_(block);
}
}
void OnServerException(const TException& e) override {
if (ExceptionCb_) {
ExceptionCb_(e);
}
}
void OnProfile(const TProfile& profile) override {
if (ProfileCb_) {
ProfileCb_(profile);
}
}
void OnProgress(const TProgress& progress) override {
if (ProgressCb_) {
ProgressCb_(progress);
}
}
void OnFinish() override {
}
private:
TString Query_;
TExceptionCallback ExceptionCb_;
TProfileCallback ProfileCb_;
TProgressCallback ProgressCb_;
TSelectCallback SelectCb_;
};
}
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