of concurrent connections for the same account)"
Added support of account specific max_user_connections limit. Made all
user limits to be counted per account instead of the old behavior,
which was per user/host accounting. Added option which enables the old
behavior. Added testing of these to the test suite.
(After review version).
client/mysqltest.c:
Extended mysqltest to be able to handle connect() statements for which
error is expected.
- Added replace_dynstr_append() utility function.
- added connect_n_handle_errors() function which connects with server
without retries and handles errors as if "connect" was usual
statement.
- do_connect(): added ability to handle connects which are expected
to return an error.
- run_query_normal(): Moved all expected-error-handling code to separate
normal_handle_error()/normal_handle_no_error() functions to be able
to reuse them in connect_n_handle_errors().
mysql-test/r/grant.result:
Fixed test results since one more column to mysql.user was added.
mysql-test/r/system_mysql_db.result:
Fixed test results since one more column to mysql.user was added.
scripts/mysql_create_system_tables.sh:
Added max_user_connections column to mysql.user table for storing
new maximal concurrent connections per account limit.
scripts/mysql_fix_privilege_tables.sql:
Added max_user_connections column to mysql.user table for storing
new maximal concurrent connections per account limit.
sql/lex.h:
Added MAX_USER_CONNECTIONS symbol used for specifying
maximum number of concurrent connections per account.
sql/mysql_priv.h:
Added declaration of opt_old_style_user_limits variable which is defined
in sql/mysqld.cc used in sql/sql_parse.cc.
sql/mysqld.cc:
Added "old-style-user-limits" option which forces user limits to behave
in old way i.e. to be counted per user/host pair instead of per account.
Added comment describing mqh_used variable.
sql/set_var.cc:
Added sys_var_max_user_conn class which implements support for the new
behavior of max_user_connections variable. Now the global instance of
this variable holds default maximum number of concurrent connections per
account (as it was before) and the session instance gives read-only
access to account-specific version of this limit.
sql/set_var.h:
Added sys_var_max_user_conn class which implements support for the new
behavior of max_user_connections variable. Now the global instance of
this variable holds default maximum number of concurrent connections per
account (as it was before) and the session instance gives read-only
access to account-specific version of this limit.
sql/sql_acl.cc:
Added support for account-specific MAX_USER_CONNECTIONS limit.
Tweaked USER_RESOURCES and their handling for better clarity.
sql/sql_parse.cc:
Added support for account-specific MAX_USER_CONNECTIONS (maximum number
of concurrent connections per account) limit. Changed default behavior
of all user limits to be per account instead of per user+host.
'--old-style-user-limits' option was added to enable the old behavior.
Made maximum number of connections per hour to be independant on the
value of global max_user_connections variable.
sql/sql_yacc.yy:
Added support of new MAX_USER_CONNECTIONS limit to grammar.
Renamed USER_RESOURCES::connections member to conn_per_hour and bits
member to specified_limits. Also enum is used instead of naked numbers
when we are working with specified_limits.
sql/structs.h:
USER_RESOURCES struct:
- Added user_conn member to store the maximum number of concurrent
connections for an account. Renamed connections member to
conn_per_hour for less ambiguity.
- Renamed member 'bits' to 'specified_limits' for the sake of clarity.
The member was used as a flag indicating which limits were mentioned
in GRANT clause.
- Added comments.
USER_CONN struct:
- Removed unused user_len member.
- Added comments.
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