implementation of mysql_stmt_reset client end

include/mysql.h:
  add mysql_stmt_reset prototype
include/mysql_com.h:
  add COM_STMT_RESET
libmysql/libmysql.def:
  Add mysql_stmt_reset def
sql/sql_prepare.cc:
  Fix selects hang after windows slowdown issue fix (send_fields)
sql/sql_parse.cc:
  Add COM_STMT_RESET
sql/mysql_priv.h:
  add defination of mysql_stmt_reset

include/mysql.h

@@ -566,6 +566,7 @@ unsigned long STDCALL mysql_param_count(MYSQL_STMT * stmt);
 my_bool STDCALL mysql_bind_param(MYSQL_STMT * stmt, MYSQL_BIND * bnd);
 my_bool STDCALL mysql_bind_result(MYSQL_STMT * stmt, MYSQL_BIND * bnd);
 my_bool STDCALL mysql_stmt_close(MYSQL_STMT * stmt);
+my_bool STDCALL mysql_stmt_reset(MYSQL_STMT * stmt);
 my_bool STDCALL mysql_stmt_free_result(MYSQL_STMT *stmt);
 unsigned int STDCALL mysql_stmt_errno(MYSQL_STMT * stmt);
 const char *STDCALL mysql_stmt_error(MYSQL_STMT * stmt);

include/mysql_com.h

@@ -44,6 +44,7 @@ enum enum_server_command
   COM_TIME, COM_DELAYED_INSERT, COM_CHANGE_USER, COM_BINLOG_DUMP,
   COM_TABLE_DUMP, COM_CONNECT_OUT, COM_REGISTER_SLAVE,
   COM_PREPARE, COM_EXECUTE, COM_LONG_DATA, COM_CLOSE_STMT,
+  COM_RESET_STMT, 
   COM_END				/* Must be last */
 };
 

libmysql/libmysql.c

@@ -3316,6 +3316,7 @@ mysql_stmt_data_seek(MYSQL_STMT *stmt, my_ulonglong row)
   }
   else
     DBUG_PRINT("exit", ("stmt doesn't contain any resultset"));
+  DBUG_VOID_RETURN;
 }
 
 
@@ -3421,6 +3422,28 @@ my_bool STDCALL mysql_stmt_close(MYSQL_STMT *stmt)
   return stmt_close(stmt, 0);
 }
 
+/*
+  Reset the statement buffers in server
+*/
+
+my_bool STDCALL mysql_stmt_reset(MYSQL_STMT *stmt)
+{
+  char buff[MYSQL_STMT_HEADER];
+  MYSQL *mysql;
+  DBUG_ENTER("mysql_stmt_reset");
+  DBUG_ASSERT(stmt != 0);
+  
+  mysql= stmt->mysql->last_used_con;
+  int4store(buff, stmt->stmt_id);		/* Send stmt id to server */
+  if (advanced_command(mysql, COM_RESET_STMT,buff,MYSQL_STMT_HEADER,0,0,1))
+  {
+    set_stmt_errmsg(stmt, mysql->net.last_error, mysql->net.last_errno, 
+                    mysql->net.sqlstate);
+    DBUG_RETURN(1);
+  }
+  DBUG_RETURN(0);
+}
+
 /*
   Return statement error code
 */

libmysql/libmysql.def

@@ -98,6 +98,7 @@ EXPORTS
 	mysql_stat
 	mysql_stmt_affected_rows
 	mysql_stmt_close
+	mysql_stmt_reset
 	mysql_stmt_data_seek
 	mysql_stmt_errno
 	mysql_stmt_error

sql/mysql_priv.h

@@ -557,6 +557,7 @@ void free_prep_stmt(PREP_STMT *stmt, TREE_FREE mode, void *not_used);
 bool mysql_stmt_prepare(THD *thd, char *packet, uint packet_length);
 void mysql_stmt_execute(THD *thd, char *packet);
 void mysql_stmt_free(THD *thd, char *packet);
+void mysql_stmt_reset(THD *thd, char *packet);
 void mysql_stmt_get_longdata(THD *thd, char *pos, ulong packet_length);
 int check_insert_fields(THD *thd,TABLE *table,List<Item> &fields,
 			List<Item> &values, ulong counter);

sql/sql_parse.cc

@@ -1290,6 +1290,11 @@ restore_user:
     mysql_stmt_free(thd, packet);
     break;
   }
+  case COM_RESET_STMT:
+  {
+    mysql_stmt_reset(thd, packet);
+    break;
+  }
   case COM_QUERY:
   {
     if (alloc_query(thd, packet, packet_length))

sql/sql_prepare.cc

@@ -965,7 +965,7 @@ void mysql_stmt_reset(THD *thd, char *packet)
   PREP_STMT *stmt;
   DBUG_ENTER("mysql_stmt_reset");
 
-  if (!(stmt=find_prepared_statement(thd, stmt_id, "close")))
+  if (!(stmt= find_prepared_statement(thd, stmt_id, "reset")))
   {
     send_error(thd);
     DBUG_VOID_RETURN;