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Fixed that prepared statements are properly igored (if possible) by query cache.

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This commit is contained in:
Michael Widenius 2012-02-10 22:53:46 +02:00
parent 3efc8d016f
commit ea45d770af
1 changed files with 25 additions and 0 deletions
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25
sql/sql_cache.cc
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@ -1659,6 +1659,17 @@ Query_cache::send_result_to_client(THD *thd, char *org_sql, uint query_length)
if (is_disabled() || thd->locked_tables ||
thd->variables.query_cache_type == 0)
goto err;
/*
The following can only happen for prepared statements that was found
during parsing or later that the query was not cacheable.
*/
if (!thd->lex->safe_to_cache_query)
{
DBUG_PRINT("qcache", ("SELECT is non-cacheable"));
goto err;
}
DBUG_ASSERT(query_cache_size != 0); // otherwise cache would be disabled
thd->query_cache_is_applicable= 1;
@ -1950,6 +1961,7 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
faster.
*/
thd->query_cache_is_applicable= 0; // Query can't be cached
thd->lex->safe_to_cache_query= 0; // For prepared statements
BLOCK_UNLOCK_RD(query_block);
DBUG_RETURN(-1);
}
@ -1966,6 +1978,7 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
table_list.db, table_list.alias));
unlock();
thd->query_cache_is_applicable= 0; // Query can't be cached
thd->lex->safe_to_cache_query= 0; // For prepared statements
BLOCK_UNLOCK_RD(query_block);
DBUG_RETURN(-1); // Privilege error
}
@ -1975,6 +1988,7 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
table_list.db, table_list.alias));
BLOCK_UNLOCK_RD(query_block);
thd->query_cache_is_applicable= 0; // Query can't be cached
thd->lex->safe_to_cache_query= 0; // For prepared statements
goto err_unlock; // Parse query
}
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
@ -1998,7 +2012,13 @@ def_week_frmt: %lu, in_trans: %d, autocommit: %d",
table->key_length());
}
else
{
/*
As this can change from call to call, don't reset set
thd->lex->safe_to_cache_query
*/
thd->query_cache_is_applicable= 0; // Query can't be cached
}
goto err_unlock; // Parse query
}
else
@ -3886,6 +3906,7 @@ Query_cache::process_and_count_tables(THD *thd, TABLE_LIST *tables_used,
DBUG_PRINT("qcache", ("Don't cache statement as it refers to "
"tables with column privileges."));
thd->query_cache_is_applicable= 0; // Query can't be cached
thd->lex->safe_to_cache_query= 0; // For prepared statements
DBUG_RETURN(0);
}
#endif
@ -4022,6 +4043,10 @@ my_bool Query_cache::ask_handler_allowance(THD *thd,
{
DBUG_PRINT("qcache", ("Handler does not allow caching for %s.%s",
tables_used->db, tables_used->alias));
/*
As this can change from call to call, don't reset set
thd->lex->safe_to_cache_query
*/
thd->query_cache_is_applicable= 0; // Query can't be cached
DBUG_RETURN(1);
}