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More comments to THD::lock and THD::locked_tables commented

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unknown 2004-01-19 23:34:39 +03:00
parent 3b98955a5c
commit eead0c1b82
1 changed files with 13 additions and 0 deletions
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13
sql/sql_class.h
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@ -624,6 +624,19 @@ public:
and are still in use by this thread and are still in use by this thread
*/ */
TABLE *open_tables,*temporary_tables, *handler_tables, *derived_tables; TABLE *open_tables,*temporary_tables, *handler_tables, *derived_tables;
/*
During a MySQL session, one can lock tables in two modes: automatic
or manual. In automatic mode all necessary tables are locked just before
statement execution, and all acquired locks are stored in a 'lock'
member. Unlocking takes place automatically as well, when the
statement ends.
Manual mode comes into play when a user issues a 'LOCK TABLES'
statement. In this mode the user can only use the locked tables.
Trying to use any other tables will give an error. The locked tables are
stored in a 'locked_tables' member. Manual locking is described in
the 'LOCK_TABLES' chapter of the MySQL manual.
See also lock_tables() for details.
*/
MYSQL_LOCK *lock; /* Current locks */ MYSQL_LOCK *lock; /* Current locks */
MYSQL_LOCK *locked_tables; /* Tables locked with LOCK */ MYSQL_LOCK *locked_tables; /* Tables locked with LOCK */
/* /*