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33bd19d2db
Core implementation - Extended the sql grammar to support creation of system triggers on startup/shutdown - System triggers metadata is stored in the table mysql.event - Events and system triggers share the same name space since both are stored in the table mysql.event declared with the PRIMARY KEY (`db`,`name`). In result, attempt to create an event with the same name as existent trigger and vice versa results in failure with the new error ER_TRG_EVENT_CONFLICTS_NAME - Since system triggers metadata is stored in the mysql.event table, on handling the DROP TRIGGER statement the table mysql.event now is opened - System triggers can be created only by users with the SUPER privilege - Added the option --sys_triggers for mysqldump to dump system triggers. The option is turned off by default. In case this option is on, mysqldump first dump the table 'mysql' unconditionally, regardless whether it was listed in the option --ignore-database
94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
#ifndef _EVENT_COMMON_H_
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#define _EVENT_COMMON_H_
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#include "sp_head.h" // Stored_program_creation_ctx
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#include "sql_alloc.h" // Sql_alloc
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/**
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Event_creation_ctx -- creation context of events.
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*/
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class Event_creation_ctx :public Stored_program_creation_ctx,
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public Sql_alloc
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{
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public:
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static bool load_from_db(THD *thd,
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MEM_ROOT *event_mem_root,
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const char *db_name,
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const char *event_name,
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TABLE *event_tbl,
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Stored_program_creation_ctx **ctx);
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public:
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Stored_program_creation_ctx *clone(MEM_ROOT *mem_root) override
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{
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return new (mem_root)
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Event_creation_ctx(m_client_cs, m_connection_cl, m_db_cl);
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}
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protected:
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Object_creation_ctx *create_backup_ctx(THD *thd) const override
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{
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/*
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We can avoid usual backup/restore employed in stored programs since we
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know that this is a top level statement and the worker thread is
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allocated exclusively to execute this event.
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*/
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return NULL;
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}
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private:
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Event_creation_ctx(CHARSET_INFO *client_cs,
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CHARSET_INFO *connection_cl,
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CHARSET_INFO *db_cl)
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: Stored_program_creation_ctx(client_cs, connection_cl, db_cl)
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{ }
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};
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class Event_table_check_intact_log_error : public Table_check_intact_log_error
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{
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public:
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bool handle_event_table() const override { return true; }
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};
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class Event_db_repository_common
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{
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public:
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static bool open_event_table(THD *thd, enum thr_lock_type lock_type,
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TABLE **table,
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bool *enable_sys_trg);
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static bool check_system_tables(THD *thd);
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/** In case of an error, a message is printed to the error log. */
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static Event_table_check_intact_log_error table_intact;
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static LEX_CSTRING MYSQL_EVENT_NAME;
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static const TABLE_FIELD_DEF event_table_def;
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static const TABLE_FIELD_DEF event_table_def_wo_trg;
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static bool check_event_table_for_validness(TABLE *ev,
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bool *system_triggers_enabled);
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};
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class Events_common
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{
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public:
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static ulong startup_state;
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/*
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the following block is to support --event-scheduler command line option
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and the @@global.event_scheduler SQL variable.
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See sys_var.cc
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*/
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enum enum_opt_event_scheduler { EVENTS_OFF, EVENTS_ON, EVENTS_DISABLED,
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EVENTS_ORIGINAL };
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};
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bool create_query_string(THD *thd, String *buf);
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#endif
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