-void _sql_close(struct sql_table_helper* th);
-int _sql_setparam(struct sql_table_helper* th,char* key, char* value);
-int _sql_fetchrow(struct sql_table_helper* th,time_t *timestamp, rrd_value_t *value,int ordered);
-char* _find_next_separator(char* start,char separator);
-char* _find_next_separator_twice(char*start,char separator);
-char _hexcharhelper(char c);
-int _inline_unescape (char* string);
-double rrd_fetch_dbi_double(dbi_result *result,int idx);
-long rrd_fetch_dbi_long(dbi_result *result,int idx);
+static void _sql_close(struct sql_table_helper* th);
+static int _sql_setparam(struct sql_table_helper* th,char* key, char* value);
+static int _sql_fetchrow(struct sql_table_helper* th,time_t *timestamp, rrd_value_t *value,int ordered);
+static char* _find_next_separator(char* start,char separator);
+static char* _find_next_separator_twice(char*start,char separator);
+static char _hexcharhelper(char c);
+static int _inline_unescape (char* string);
+static double rrd_fetch_dbi_double(dbi_result *result,int idx);
+static long rrd_fetch_dbi_long(dbi_result *result,int idx);