mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-22 01:30:51 +00:00
419 lines
10 KiB
C++
419 lines
10 KiB
C++
#pragma once
|
|
|
|
#include <DB/Dictionaries/IDictionarySource.h>
|
|
#include <DB/Dictionaries/MySQLBlockInputStream.h>
|
|
#include <ext/range.hpp>
|
|
#include <mysqlxx/Pool.h>
|
|
#include <Poco/Util/AbstractConfiguration.h>
|
|
#include "writeParenthesisedString.h"
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/// Allows loading dictionaries from a MySQL database
|
|
class MySQLDictionarySource final : public IDictionarySource
|
|
{
|
|
static const auto max_block_size = 8192;
|
|
|
|
public:
|
|
MySQLDictionarySource(const DictionaryStructure & dict_struct,
|
|
const Poco::Util::AbstractConfiguration & config, const std::string & config_prefix,
|
|
const Block & sample_block)
|
|
: dict_struct{dict_struct},
|
|
db{config.getString(config_prefix + ".db", "")},
|
|
table{config.getString(config_prefix + ".table")},
|
|
where{config.getString(config_prefix + ".where", "")},
|
|
dont_check_update_time{config.getBool(config_prefix + ".dont_check_update_time", false)},
|
|
sample_block{sample_block},
|
|
pool{config, config_prefix},
|
|
load_all_query{composeLoadAllQuery()}
|
|
{}
|
|
|
|
/// copy-constructor is provided in order to support cloneability
|
|
MySQLDictionarySource(const MySQLDictionarySource & other)
|
|
: dict_struct{other.dict_struct},
|
|
db{other.db},
|
|
table{other.table},
|
|
where{other.where},
|
|
dont_check_update_time{other.dont_check_update_time},
|
|
sample_block{other.sample_block},
|
|
pool{other.pool},
|
|
load_all_query{other.load_all_query}, last_modification{other.last_modification}
|
|
{}
|
|
|
|
BlockInputStreamPtr loadAll() override
|
|
{
|
|
last_modification = getLastModification();
|
|
|
|
LOG_TRACE(log, load_all_query);
|
|
return new MySQLBlockInputStream{pool.Get(), load_all_query, sample_block, max_block_size};
|
|
}
|
|
|
|
BlockInputStreamPtr loadIds(const std::vector<std::uint64_t> & ids) override
|
|
{
|
|
/// Здесь не логгируем и не обновляем время модификации, так как запрос может быть большим, и часто задаваться.
|
|
|
|
const auto query = composeLoadIdsQuery(ids);
|
|
return new MySQLBlockInputStream{pool.Get(), query, sample_block, max_block_size};
|
|
}
|
|
|
|
BlockInputStreamPtr loadKeys(
|
|
const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows) override
|
|
{
|
|
/// Здесь не логгируем и не обновляем время модификации, так как запрос может быть большим, и часто задаваться.
|
|
|
|
const auto query = composeLoadKeysQuery(key_columns, requested_rows);
|
|
return new MySQLBlockInputStream{pool.Get(), query, sample_block, max_block_size};
|
|
}
|
|
|
|
bool isModified() const override
|
|
{
|
|
if (dont_check_update_time)
|
|
return true;
|
|
|
|
return getLastModification() > last_modification;
|
|
}
|
|
|
|
bool supportsSelectiveLoad() const override { return true; }
|
|
|
|
DictionarySourcePtr clone() const override { return std::make_unique<MySQLDictionarySource>(*this); }
|
|
|
|
std::string toString() const override
|
|
{
|
|
return "MySQL: " + db + '.' + table + (where.empty() ? "" : ", where: " + where);
|
|
}
|
|
|
|
private:
|
|
Logger * log = &Logger::get("MySQLDictionarySource");
|
|
|
|
static std::string quoteForLike(const std::string s)
|
|
{
|
|
std::string tmp;
|
|
tmp.reserve(s.size());
|
|
|
|
for (auto c : s)
|
|
{
|
|
if (c == '%' || c == '_' || c == '\\')
|
|
tmp.push_back('\\');
|
|
tmp.push_back(c);
|
|
}
|
|
|
|
std::string res;
|
|
{
|
|
WriteBufferFromString out(res);
|
|
writeQuoted(tmp, out);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
mysqlxx::DateTime getLastModification() const
|
|
{
|
|
mysqlxx::DateTime update_time{std::time(nullptr)};
|
|
|
|
if (dont_check_update_time)
|
|
return update_time;
|
|
|
|
try
|
|
{
|
|
auto connection = pool.Get();
|
|
auto query = connection->query("SHOW TABLE STATUS LIKE " + quoteForLike(table));
|
|
|
|
LOG_TRACE(log, query.str());
|
|
|
|
auto result = query.use();
|
|
|
|
size_t fetched_rows = 0;
|
|
if (auto row = result.fetch())
|
|
{
|
|
++fetched_rows;
|
|
const auto UPDATE_TIME_IDX = 12;
|
|
const auto & update_time_value = row[UPDATE_TIME_IDX];
|
|
|
|
if (!update_time_value.isNull())
|
|
{
|
|
update_time = update_time_value.getDateTime();
|
|
LOG_TRACE(log, "Got update time: " << update_time);
|
|
}
|
|
|
|
/// fetch remaining rows to avoid "commands out of sync" error
|
|
while (auto row = result.fetch())
|
|
++fetched_rows;
|
|
}
|
|
|
|
if (0 == fetched_rows)
|
|
LOG_ERROR(log, "Cannot find table in SHOW TABLE STATUS result.");
|
|
|
|
if (fetched_rows > 1)
|
|
LOG_ERROR(log, "Found more than one table in SHOW TABLE STATUS result.");
|
|
}
|
|
catch (...)
|
|
{
|
|
tryLogCurrentException("MySQLDictionarySource");
|
|
}
|
|
|
|
/// we suppose failure to get modification time is not an error, therefore return current time
|
|
return update_time;
|
|
}
|
|
|
|
std::string composeLoadAllQuery() const
|
|
{
|
|
std::string query;
|
|
|
|
{
|
|
WriteBufferFromString out{query};
|
|
writeString("SELECT ", out);
|
|
|
|
if (dict_struct.id)
|
|
{
|
|
if (!dict_struct.id->expression.empty())
|
|
{
|
|
writeParenthesisedString(dict_struct.id->expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(dict_struct.id->name, out);
|
|
|
|
if (dict_struct.range_min && dict_struct.range_max)
|
|
{
|
|
writeString(", ", out);
|
|
|
|
if (!dict_struct.range_min->expression.empty())
|
|
{
|
|
writeParenthesisedString(dict_struct.range_min->expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(dict_struct.range_min->name, out);
|
|
|
|
writeString(", ", out);
|
|
|
|
if (!dict_struct.range_max->expression.empty())
|
|
{
|
|
writeParenthesisedString(dict_struct.range_max->expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(dict_struct.range_max->name, out);
|
|
}
|
|
}
|
|
else if (dict_struct.key)
|
|
{
|
|
auto first = true;
|
|
for (const auto & key : *dict_struct.key)
|
|
{
|
|
if (!first)
|
|
writeString(", ", out);
|
|
|
|
first = false;
|
|
|
|
if (!key.expression.empty())
|
|
{
|
|
writeParenthesisedString(key.expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(key.name, out);
|
|
}
|
|
}
|
|
|
|
for (const auto & attr : dict_struct.attributes)
|
|
{
|
|
writeString(", ", out);
|
|
|
|
if (!attr.expression.empty())
|
|
{
|
|
writeParenthesisedString(attr.expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(attr.name, out);
|
|
}
|
|
|
|
writeString(" FROM ", out);
|
|
if (!db.empty())
|
|
{
|
|
writeProbablyBackQuotedString(db, out);
|
|
writeChar('.', out);
|
|
}
|
|
writeProbablyBackQuotedString(table, out);
|
|
|
|
if (!where.empty())
|
|
{
|
|
writeString(" WHERE ", out);
|
|
writeString(where, out);
|
|
}
|
|
|
|
writeChar(';', out);
|
|
}
|
|
|
|
return query;
|
|
}
|
|
|
|
std::string composeLoadIdsQuery(const std::vector<std::uint64_t> & ids)
|
|
{
|
|
if (!dict_struct.id)
|
|
throw Exception{"Simple key required for method", ErrorCodes::UNSUPPORTED_METHOD};
|
|
|
|
std::string query;
|
|
|
|
{
|
|
WriteBufferFromString out{query};
|
|
writeString("SELECT ", out);
|
|
|
|
if (!dict_struct.id->expression.empty())
|
|
{
|
|
writeParenthesisedString(dict_struct.id->expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(dict_struct.id->name, out);
|
|
|
|
for (const auto & attr : dict_struct.attributes)
|
|
{
|
|
writeString(", ", out);
|
|
|
|
if (!attr.expression.empty())
|
|
{
|
|
writeParenthesisedString(attr.expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(attr.name, out);
|
|
}
|
|
|
|
writeString(" FROM ", out);
|
|
if (!db.empty())
|
|
{
|
|
writeProbablyBackQuotedString(db, out);
|
|
writeChar('.', out);
|
|
}
|
|
writeProbablyBackQuotedString(table, out);
|
|
|
|
writeString(" WHERE ", out);
|
|
|
|
if (!where.empty())
|
|
{
|
|
writeString(where, out);
|
|
writeString(" AND ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(dict_struct.id->name, out);
|
|
writeString(" IN (", out);
|
|
|
|
auto first = true;
|
|
for (const auto id : ids)
|
|
{
|
|
if (!first)
|
|
writeString(", ", out);
|
|
|
|
first = false;
|
|
writeString(DB::toString(id), out);
|
|
}
|
|
|
|
writeString(");", out);
|
|
}
|
|
|
|
return query;
|
|
}
|
|
|
|
std::string composeLoadKeysQuery(
|
|
const ConstColumnPlainPtrs & key_columns, const std::vector<std::size_t> & requested_rows)
|
|
{
|
|
if (!dict_struct.key)
|
|
throw Exception{"Composite key required for method", ErrorCodes::UNSUPPORTED_METHOD};
|
|
|
|
std::string query;
|
|
|
|
{
|
|
WriteBufferFromString out{query};
|
|
writeString("SELECT ", out);
|
|
|
|
auto first = true;
|
|
for (const auto & key_or_attribute : boost::join(*dict_struct.key, dict_struct.attributes))
|
|
{
|
|
if (!first)
|
|
writeString(", ", out);
|
|
|
|
first = false;
|
|
|
|
if (!key_or_attribute.expression.empty())
|
|
{
|
|
writeParenthesisedString(key_or_attribute.expression, out);
|
|
writeString(" AS ", out);
|
|
}
|
|
|
|
writeProbablyBackQuotedString(key_or_attribute.name, out);
|
|
}
|
|
|
|
writeString(" FROM ", out);
|
|
if (!db.empty())
|
|
{
|
|
writeProbablyBackQuotedString(db, out);
|
|
writeChar('.', out);
|
|
}
|
|
writeProbablyBackQuotedString(table, out);
|
|
|
|
writeString(" WHERE ", out);
|
|
|
|
if (!where.empty())
|
|
{
|
|
writeString(where, out);
|
|
writeString(" AND ", out);
|
|
}
|
|
|
|
first = true;
|
|
for (const auto row : requested_rows)
|
|
{
|
|
if (!first)
|
|
writeString(" OR ", out);
|
|
|
|
first = false;
|
|
composeKeyCondition(key_columns, row, out);
|
|
}
|
|
|
|
writeString(";", out);
|
|
}
|
|
|
|
return query;
|
|
}
|
|
|
|
void composeKeyCondition(const ConstColumnPlainPtrs & key_columns, const std::size_t row, WriteBuffer & out) const
|
|
{
|
|
writeString("(", out);
|
|
|
|
const auto keys_size = key_columns.size();
|
|
auto first = true;
|
|
for (const auto i : ext::range(0, keys_size))
|
|
{
|
|
if (!first)
|
|
writeString(" AND ", out);
|
|
|
|
first = false;
|
|
|
|
const auto & key_description = (*dict_struct.key)[i];
|
|
const auto & value = (*key_columns[i])[row];
|
|
|
|
/// key_i=value_i
|
|
writeString(key_description.name, out);
|
|
writeString("=", out);
|
|
key_description.type->serializeTextQuoted(value, out);
|
|
}
|
|
|
|
writeString(")", out);
|
|
}
|
|
|
|
const DictionaryStructure dict_struct;
|
|
const std::string db;
|
|
const std::string table;
|
|
const std::string where;
|
|
const bool dont_check_update_time;
|
|
Block sample_block;
|
|
mutable mysqlxx::PoolWithFailover pool;
|
|
const std::string load_all_query;
|
|
mysqlxx::DateTime last_modification;
|
|
};
|
|
|
|
}
|