mirror of
https://github.com/ClickHouse/ClickHouse.git
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419 lines
10 KiB
C++
419 lines
10 KiB
C++
#pragma once
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#include <DB/Dictionaries/IDictionarySource.h>
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#include <DB/Dictionaries/MySQLBlockInputStream.h>
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#include <ext/range.hpp>
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#include <mysqlxx/Pool.h>
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#include <Poco/Util/AbstractConfiguration.h>
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#include "writeParenthesisedString.h"
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namespace DB
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{
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/// Allows loading dictionaries from a MySQL database
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class MySQLDictionarySource final : public IDictionarySource
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{
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static const auto max_block_size = 8192;
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public:
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MySQLDictionarySource(const DictionaryStructure & dict_struct,
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const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
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const Block & sample_block)
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: dict_struct{dict_struct},
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db{config.getString(config_prefix + ".db", "")},
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table{config.getString(config_prefix + ".table")},
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where{config.getString(config_prefix + ".where", "")},
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dont_check_update_time{config.getBool(config_prefix + ".dont_check_update_time", false)},
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sample_block{sample_block},
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pool{config, config_prefix},
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load_all_query{composeLoadAllQuery()}
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{}
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/// copy-constructor is provided in order to support cloneability
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MySQLDictionarySource(const MySQLDictionarySource & other)
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: dict_struct{other.dict_struct},
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db{other.db},
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table{other.table},
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where{other.where},
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dont_check_update_time{other.dont_check_update_time},
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sample_block{other.sample_block},
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pool{other.pool},
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load_all_query{other.load_all_query}, last_modification{other.last_modification}
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{}
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BlockInputStreamPtr loadAll() override
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{
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last_modification = getLastModification();
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LOG_TRACE(log, load_all_query);
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return new MySQLBlockInputStream{pool.Get(), load_all_query, sample_block, max_block_size};
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}
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BlockInputStreamPtr loadIds(const std::vector<std::uint64_t> & ids) override
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{
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/// Здесь не логгируем и не обновляем время модификации, так как запрос может быть большим, и часто задаваться.
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const auto query = composeLoadIdsQuery(ids);
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return new MySQLBlockInputStream{pool.Get(), query, sample_block, max_block_size};
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}
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BlockInputStreamPtr loadKeys(
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const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows) override
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{
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/// Здесь не логгируем и не обновляем время модификации, так как запрос может быть большим, и часто задаваться.
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const auto query = composeLoadKeysQuery(key_columns, requested_rows);
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return new MySQLBlockInputStream{pool.Get(), query, sample_block, max_block_size};
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}
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bool isModified() const override
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{
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if (dont_check_update_time)
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return true;
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return getLastModification() > last_modification;
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}
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bool supportsSelectiveLoad() const override { return true; }
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DictionarySourcePtr clone() const override { return std::make_unique<MySQLDictionarySource>(*this); }
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std::string toString() const override
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{
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return "MySQL: " + db + '.' + table + (where.empty() ? "" : ", where: " + where);
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}
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private:
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Logger * log = &Logger::get("MySQLDictionarySource");
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static std::string quoteForLike(const std::string s)
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{
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std::string tmp;
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tmp.reserve(s.size());
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for (auto c : s)
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{
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if (c == '%' || c == '_' || c == '\\')
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tmp.push_back('\\');
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tmp.push_back(c);
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}
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std::string res;
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{
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WriteBufferFromString out(res);
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writeQuoted(tmp, out);
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}
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return res;
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}
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mysqlxx::DateTime getLastModification() const
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{
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mysqlxx::DateTime update_time{std::time(nullptr)};
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if (dont_check_update_time)
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return update_time;
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try
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{
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auto connection = pool.Get();
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auto query = connection->query("SHOW TABLE STATUS LIKE " + quoteForLike(table));
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LOG_TRACE(log, query.str());
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auto result = query.use();
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size_t fetched_rows = 0;
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if (auto row = result.fetch())
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{
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++fetched_rows;
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const auto UPDATE_TIME_IDX = 12;
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const auto & update_time_value = row[UPDATE_TIME_IDX];
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if (!update_time_value.isNull())
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{
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update_time = update_time_value.getDateTime();
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LOG_TRACE(log, "Got update time: " << update_time);
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}
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/// fetch remaining rows to avoid "commands out of sync" error
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while (auto row = result.fetch())
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++fetched_rows;
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}
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if (0 == fetched_rows)
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LOG_ERROR(log, "Cannot find table in SHOW TABLE STATUS result.");
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if (fetched_rows > 1)
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LOG_ERROR(log, "Found more than one table in SHOW TABLE STATUS result.");
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}
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catch (...)
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{
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tryLogCurrentException("MySQLDictionarySource");
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}
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/// we suppose failure to get modification time is not an error, therefore return current time
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return update_time;
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}
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std::string composeLoadAllQuery() const
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{
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std::string query;
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{
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WriteBufferFromString out{query};
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writeString("SELECT ", out);
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if (dict_struct.id)
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{
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if (!dict_struct.id->expression.empty())
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{
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writeParenthesisedString(dict_struct.id->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.id->name, out);
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if (dict_struct.range_min && dict_struct.range_max)
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{
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writeString(", ", out);
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if (!dict_struct.range_min->expression.empty())
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{
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writeParenthesisedString(dict_struct.range_min->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.range_min->name, out);
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writeString(", ", out);
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if (!dict_struct.range_max->expression.empty())
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{
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writeParenthesisedString(dict_struct.range_max->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.range_max->name, out);
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}
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}
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else if (dict_struct.key)
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{
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auto first = true;
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for (const auto & key : *dict_struct.key)
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{
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if (!first)
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writeString(", ", out);
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first = false;
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if (!key.expression.empty())
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{
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writeParenthesisedString(key.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(key.name, out);
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}
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}
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for (const auto & attr : dict_struct.attributes)
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{
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writeString(", ", out);
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if (!attr.expression.empty())
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{
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writeParenthesisedString(attr.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(attr.name, out);
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}
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writeString(" FROM ", out);
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if (!db.empty())
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{
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writeProbablyBackQuotedString(db, out);
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writeChar('.', out);
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}
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writeProbablyBackQuotedString(table, out);
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if (!where.empty())
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{
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writeString(" WHERE ", out);
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writeString(where, out);
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}
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writeChar(';', out);
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}
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return query;
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}
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std::string composeLoadIdsQuery(const std::vector<std::uint64_t> & ids)
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{
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if (!dict_struct.id)
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throw Exception{"Simple key required for method", ErrorCodes::UNSUPPORTED_METHOD};
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std::string query;
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{
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WriteBufferFromString out{query};
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writeString("SELECT ", out);
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if (!dict_struct.id->expression.empty())
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{
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writeParenthesisedString(dict_struct.id->expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(dict_struct.id->name, out);
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for (const auto & attr : dict_struct.attributes)
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{
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writeString(", ", out);
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if (!attr.expression.empty())
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{
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writeParenthesisedString(attr.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(attr.name, out);
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}
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writeString(" FROM ", out);
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if (!db.empty())
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{
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writeProbablyBackQuotedString(db, out);
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writeChar('.', out);
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}
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writeProbablyBackQuotedString(table, out);
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writeString(" WHERE ", out);
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if (!where.empty())
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{
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writeString(where, out);
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writeString(" AND ", out);
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}
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writeProbablyBackQuotedString(dict_struct.id->name, out);
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writeString(" IN (", out);
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auto first = true;
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for (const auto id : ids)
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{
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if (!first)
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writeString(", ", out);
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first = false;
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writeString(DB::toString(id), out);
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}
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writeString(");", out);
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}
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return query;
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}
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std::string composeLoadKeysQuery(
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const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows)
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{
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if (!dict_struct.key)
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throw Exception{"Composite key required for method", ErrorCodes::UNSUPPORTED_METHOD};
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std::string query;
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{
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WriteBufferFromString out{query};
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writeString("SELECT ", out);
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auto first = true;
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for (const auto & key_or_attribute : boost::join(*dict_struct.key, dict_struct.attributes))
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{
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if (!first)
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writeString(", ", out);
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first = false;
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if (!key_or_attribute.expression.empty())
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{
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writeParenthesisedString(key_or_attribute.expression, out);
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writeString(" AS ", out);
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}
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writeProbablyBackQuotedString(key_or_attribute.name, out);
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}
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writeString(" FROM ", out);
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if (!db.empty())
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{
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writeProbablyBackQuotedString(db, out);
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writeChar('.', out);
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}
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writeProbablyBackQuotedString(table, out);
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writeString(" WHERE ", out);
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if (!where.empty())
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{
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writeString(where, out);
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writeString(" AND ", out);
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}
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first = true;
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for (const auto row : requested_rows)
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{
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if (!first)
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writeString(" OR ", out);
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first = false;
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composeKeyCondition(key_columns, row, out);
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}
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writeString(";", out);
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}
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return query;
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}
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void composeKeyCondition(const ConstColumnPlainPtrs & key_columns, const std::size_t row, WriteBuffer & out) const
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{
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writeString("(", out);
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const auto keys_size = key_columns.size();
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auto first = true;
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for (const auto i : ext::range(0, keys_size))
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{
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if (!first)
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writeString(" AND ", out);
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first = false;
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const auto & key_description = (*dict_struct.key)[i];
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const auto & value = (*key_columns[i])[row];
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/// key_i=value_i
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writeString(key_description.name, out);
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writeString("=", out);
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key_description.type->serializeTextQuoted(value, out);
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}
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writeString(")", out);
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}
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const DictionaryStructure dict_struct;
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const std::string db;
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const std::string table;
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const std::string where;
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const bool dont_check_update_time;
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Block sample_block;
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mutable mysqlxx::PoolWithFailover pool;
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const std::string load_all_query;
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mysqlxx::DateTime last_modification;
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};
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}
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