ClickHouse/base/mysqlxx/Query.cpp
Azat Khuzhin a4f2663b82 Log queries to external databases (since they may be rewriten)
By rewritten means that some expression from WHERE can be removed, yes
there is external_table_strict_query, but sometimes it is too strict.
2021-09-29 21:56:28 +03:00

106 lines
2.2 KiB
C++

#if __has_include(<mysql.h>)
#include <errmsg.h>
#include <mysql.h>
#else
#include <mysql/errmsg.h> //Y_IGNORE
#include <mysql/mysql.h>
#endif
#include <Poco/Logger.h>
#include <mysqlxx/Connection.h>
#include <mysqlxx/Query.h>
#include <mysqlxx/Types.h>
namespace mysqlxx
{
Query::Query(Connection * conn_, const std::string & query_string) : conn(conn_)
{
/// Важно в случае, если Query используется не из того же потока, что Connection.
mysql_thread_init();
if (!query_string.empty())
query_buf << query_string;
query_buf.imbue(std::locale::classic());
}
Query::Query(const Query & other) : conn(other.conn)
{
/// Важно в случае, если Query используется не из того же потока, что Connection.
mysql_thread_init();
query_buf.imbue(std::locale::classic());
*this << other.str();
}
Query & Query::operator= (const Query & other)
{
if (this == &other)
return *this;
conn = other.conn;
query_buf.str(other.str());
return *this;
}
Query::~Query()
{
mysql_thread_end();
}
void Query::reset()
{
query_buf.str({});
}
void Query::executeImpl()
{
std::string query_string = query_buf.str();
MYSQL* mysql_driver = conn->getDriver();
auto & logger = Poco::Logger::get("mysqlxx::Query");
logger.trace("Running MySQL query using connection %lu", mysql_thread_id(mysql_driver));
if (mysql_real_query(mysql_driver, query_string.data(), query_string.size()))
{
const auto err_no = mysql_errno(mysql_driver);
switch (err_no)
{
case CR_SERVER_GONE_ERROR:
[[fallthrough]];
case CR_SERVER_LOST:
throw ConnectionLost(errorMessage(mysql_driver), err_no);
default:
throw BadQuery(errorMessage(mysql_driver), err_no);
}
}
}
UseQueryResult Query::use()
{
executeImpl();
MYSQL_RES * res = mysql_use_result(conn->getDriver());
if (!res)
onError(conn->getDriver());
return UseQueryResult(res, conn, this);
}
void Query::execute()
{
executeImpl();
}
UInt64 Query::insertID()
{
return mysql_insert_id(conn->getDriver());
}
}