Hi,
I hava a trouble with getting a data from
informaition_schema.global_status table not using query.
I wrote below code and it's possible to get data from some table in
performance_schema .
** reader.cc
===============================================================================================
my_thread_init();
...
MEM_ROOT mem_field;
READ_RECORD read_record_info;
tables.init_one_table(STRING_WITH_LEN("performance_schema"),
STRING_WITH_LEN("events_statements_current"),
bool result = open_and_lock_tables(ctx->thd, &tables, FALSE,
MYSQL_LOCK_IGNORE_TIMEOUT);
if (result)
{
return false;
}
if(table = tables.table) /* if only table exists */
{
init_sql_alloc(&mem_field, 1024, 0, MYF(0));
...
while (!(error= read_record_info.read_record(&read_record_info)))
{
char* value = get_field(&mem_field, table->field[0]); // It's OK.
....
}
}
...
====================================================================================
It's possible to read data from performance_schema tables using low-level
function .
But I tried to read data from information_schema.global_status table as
same way(just changed the name of database and table) , an error occurred
in open_and_lock_tables().
Is there a way to read data from information_schema.global_status not using
query?
Regards,
Kim kyungnam.
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