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https://dev.mysql.com/doc/c-api/8.4/en/mysql-refresh.html
CR_SERVER_LOST The connection to the server was lost during the query. int mysql_refresh(MYSQL *mysql, unsigned int options) Description Note mysql_refresh() is deprecated and is subject to removal in a future version of MySQL. This function ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-reload.html
CR_SERVER_LOST The connection to the server was lost during the query. int mysql_reload(MYSQL *mysql) Description Asks the MySQL server to reload the grant tables. Use mysql_real_query() or mysql_query() to issue an SQL FLUSH PRIVILEGES statement ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-rollback.html
In particular, if the value of completion_type is RELEASE (or 2), the server performs a release after terminating a transaction and closes the client connection. Call mysql_close() from the client program to close the connection from the client side. The action of this function is subject to the value of the completion_type system ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-set-server-option.html
int mysql_set_server_option(MYSQL *mysql, enum enum_mysql_set_option option) Description Enables or disables an option for the connection. Enabling multiple-statement support with MYSQL_OPTION_MULTI_STATEMENTS_ON does not have quite the same effect ...Option Description MYSQL_OPTION_MULTI_STATEMENTS_ON Enable multiple-statement support MYSQL_OPTION_MULTI_STATEMENTS_OFF Disable multiple-statement support If you enable multiple-statement support, you should retrieve results from calls to mysql_real_query() or mysql_query() by using a loop that calls mysql_next_result() to determine whether there are more ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-shutdown.html
CR_SERVER_LOST The connection to the server was lost during the query. int mysql_shutdown(MYSQL *mysql, enum mysql_enum_shutdown_level shutdown_level) Description Note mysql_shutdown() is deprecated and will be removed in a future version of MySQL.
https://dev.mysql.com/doc/c-api/8.4/en/mysql-stmt-execute.html
CR_SERVER_LOST The connection to the server was lost during the query. The mysql variable is assumed to be a valid connection handler. int mysql_stmt_execute(MYSQL_STMT *stmt) Description mysql_stmt_execute() executes the prepared query associated ...
https://dev.mysql.com/doc/c-api/8.4/en/mysql-stmt-fetch.html
CR_SERVER_LOST The connection to the server was lost during the query. (This example expects to retrieve the two rows inserted by the example shown in Section 6.4.11, “mysql_stmt_execute()”.) The mysql variable is assumed to be a valid ... int ...
https://dev.mysql.com/doc/extending-mysql/8.4/en/plugin-types.html
Plugins on the server side implement authentication methods for use by clients when they connect to the server. A server-side authentication plugin can return to the server the name of the user whose identity the connecting user should have. The ...
https://dev.mysql.com/doc/extending-mysql/8.4/en/writing-authentication-plugins.html
MySQL supports pluggable authentication, in which plugins are invoked to authenticate client connections. Also, authentication plugins can support the proxy user capability, such that the connecting user is a proxy for another user and is treated, ...Authentication plugins enable the use of authentication methods other than the built-in method of passwords stored in the mysql.user system ...
https://dev.mysql.com/doc/relnotes/mysql-shell/8.4/en/news-8-4-4.html
As of this release, the following changes were made: replicationLag is set to null if the replication connection, or SQL thread, is not running. As a result, MySQL Router did not recognize the topology and rejected connections to it. AdminAPI Bugs ...