mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-06 07:32:27 +00:00
63b95c7451
* Added a new type of Exception for better recognition of connection failures * Added more logging for mysql communication * Retries on connection loss during query. Make MySQL dictionary source resilient to unexpected loss of connection during querying MySQL. This behavior is controlled with ".fail_on_connection_loss" config parameter, which defaults to false. * Stripped some debugging leftover garbage * Minor followup corrections * Corrections after PR comments * Yet more fixes
106 lines
2.2 KiB
C++
106 lines
2.2 KiB
C++
#if __has_include(<mysql.h>)
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#include <errmsg.h>
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#include <mysql.h>
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#else
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#include <mysql/errmsg.h>
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#include <mysql/mysql.h>
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#endif
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#include <Poco/Logger.h>
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#include <mysqlxx/Connection.h>
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#include <mysqlxx/Query.h>
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#include <mysqlxx/Types.h>
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namespace mysqlxx
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{
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Query::Query(Connection * conn_, const std::string & query_string) : conn(conn_)
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{
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/// Важно в случае, если Query используется не из того же потока, что Connection.
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mysql_thread_init();
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if (!query_string.empty())
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query_buf << query_string;
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query_buf.imbue(std::locale::classic());
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}
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Query::Query(const Query & other) : conn(other.conn)
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{
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/// Важно в случае, если Query используется не из того же потока, что Connection.
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mysql_thread_init();
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query_buf.imbue(std::locale::classic());
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*this << other.str();
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}
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Query & Query::operator= (const Query & other)
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{
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if (this == &other)
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return *this;
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conn = other.conn;
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query_buf.str(other.str());
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return *this;
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}
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Query::~Query()
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{
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mysql_thread_end();
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}
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void Query::reset()
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{
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query_buf.str({});
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}
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void Query::executeImpl()
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{
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std::string query_string = query_buf.str();
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MYSQL* mysql_driver = conn->getDriver();
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auto & logger = Poco::Logger::get("mysqlxx::Query");
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logger.trace("Running MySQL query using connection %lu", mysql_thread_id(mysql_driver));
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if (mysql_real_query(mysql_driver, query_string.data(), query_string.size()))
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{
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const auto err_no = mysql_errno(mysql_driver);
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switch (err_no)
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{
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case CR_SERVER_GONE_ERROR:
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[[fallthrough]];
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case CR_SERVER_LOST:
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throw ConnectionLost(errorMessage(mysql_driver), err_no);
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default:
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throw BadQuery(errorMessage(mysql_driver), err_no);
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}
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}
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}
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UseQueryResult Query::use()
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{
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executeImpl();
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MYSQL_RES * res = mysql_use_result(conn->getDriver());
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if (!res)
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onError(conn->getDriver());
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return UseQueryResult(res, conn, this);
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}
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void Query::execute()
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{
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executeImpl();
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}
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UInt64 Query::insertID()
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{
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return mysql_insert_id(conn->getDriver());
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}
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}
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