Fixes for bugs in embedded library:

#4700 (Unsigned value returned as signed)
    just no appropriate checking
#4701 (Errors returned earlier than expected)
    all errors returned from send_command()
#4702 (Result isn't freed properly if there's no retrieval)
    flush_use_result has only 'client' version and should
    be made 'virtual'


include/mysql.h:
  flush_use_result 'virtual' method added to MYSQL (#4701)
include/sql_common.h:
  no flush_use_result() now (#4702)
libmysql/libmysql.c:
  call of the flush_use_result changed (#4702)
libmysqld/lib_sql.cc:
  now errors returned from emb_advanced_command() or from emb_read_rows()
  depending on if number of returned fields is not 0 (#4701)
  emb_flush_use_result() implementation (#4702)
sql-common/client.c:
  cli_flush_use_result() implementation (#4702)
sql/sql_prepare.cc:
  unsigned flag now checked (#4700)

1 files changed, 2 insertions, 2 deletions

diff --git a/libmysql/libmysql.c b/libmysql/libmysql.c
index fc7728c98e0..2b67d645d1a 100644
--- a/libmysql/libmysql.c
+++ b/libmysql/libmysql.c
@@ -4181,7 +4181,7 @@ my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt)
       if (mysql->status != MYSQL_STATUS_READY)
       {
         /* There is a result set and it belongs to this statement */
-        flush_use_result(mysql);
+        (*mysql->methods->flush_use_result)(mysql);
         mysql->status= MYSQL_STATUS_READY;
       }
     }
@@ -4231,7 +4231,7 @@ my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
           Flush result set of the connection. If it does not belong
           to this statement, set a warning.
         */
-        flush_use_result(mysql);
+        (*mysql->methods->flush_use_result)(mysql);
         if (mysql->unbuffered_fetch_owner)
           *mysql->unbuffered_fetch_owner= TRUE;
         mysql->status= MYSQL_STATUS_READY;