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A fix for Bug#22891 "session level max_allowed_packet can be

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set but is ignored".
                                  
This patch makes @@session.max_allowed_packed and
@@session.net_buffer_length read-only as suggested in the bug
report. The user will have to use SET GLOBAL (and reconnect)
to alter the session values of these variables.
                            
The error string ER_VARIABLE_IS_READONLY is introduced.
                            
Tests are modified accordingly.
This commit is contained in:
Staale Smedseng
2008-11-20 08:51:48 +01:00
parent b8cd1725b1
commit e60c8c8b68
18 changed files with 176 additions and 239 deletions
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23
sql/set_var.h
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@ -1024,6 +1024,29 @@ public:
};
/**
* @brief This is a specialization of sys_var_thd_ulong that implements a
read-only session variable. The class overrides check() and check_default()
to achieve the read-only property for the session part of the variable.
*/
class sys_var_thd_ulong_session_readonly : public sys_var_thd_ulong
{
public:
sys_var_thd_ulong_session_readonly(sys_var_chain *chain_arg,
const char *name_arg, ulong SV::*offset_arg,
sys_check_func c_func= NULL,
sys_after_update_func au_func= NULL,
Binlog_status_enum bl_status_arg= NOT_IN_BINLOG):
sys_var_thd_ulong(chain_arg, name_arg, offset_arg, c_func, au_func, bl_status_arg)
{ }
bool check(THD *thd, set_var *var);
bool check_default(enum_var_type type)
{
return type != OPT_GLOBAL || !option_limits;
}
};
class sys_var_microseconds :public sys_var_thd
{
ulonglong SV::*offset;