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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 18:07:14 +0000 |
commit | a175314c3e5827eb193872241446f2f8f5c9d33c (patch) | |
tree | cd3d60ca99ae00829c52a6ca79150a5b6e62528b /sql/sql_cursor.h | |
parent | Initial commit. (diff) | |
download | mariadb-10.5-9e4947182e0b875da38088fdd168e775f473b8ad.tar.xz mariadb-10.5-9e4947182e0b875da38088fdd168e775f473b8ad.zip |
Adding upstream version 1:10.5.12.upstream/1%10.5.12upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sql/sql_cursor.h')
-rw-r--r-- | sql/sql_cursor.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/sql/sql_cursor.h b/sql/sql_cursor.h new file mode 100644 index 00000000..00b9cd4e --- /dev/null +++ b/sql/sql_cursor.h @@ -0,0 +1,72 @@ +/* Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */ + +#ifndef _sql_cursor_h_ +#define _sql_cursor_h_ + +#ifdef USE_PRAGMA_INTERFACE +#pragma interface /* gcc class interface */ +#endif + +#include "sql_class.h" /* Query_arena */ + +class JOIN; + +/** + @file + + Declarations for implementation of server side cursors. Only + read-only non-scrollable cursors are currently implemented. +*/ + +/** + Server_side_cursor -- an interface for materialized + implementation of cursors. All cursors are self-contained + (created in their own memory root). For that reason they must + be deleted only using a pointer to Server_side_cursor, not to + its base class. +*/ + +class Server_side_cursor: protected Query_arena, public Sql_alloc +{ +protected: + /** Row destination used for fetch */ + select_result *result; +public: + Server_side_cursor(MEM_ROOT *mem_root_arg, select_result *result_arg) + :Query_arena(mem_root_arg, STMT_INITIALIZED), result(result_arg) + {} + + virtual bool is_open() const= 0; + + virtual int open(JOIN *top_level_join)= 0; + virtual void fetch(ulong num_rows)= 0; + virtual void close()= 0; + virtual bool export_structure(THD *thd, Row_definition_list *defs) + { + DBUG_ASSERT(0); + return true; + } + virtual ~Server_side_cursor(); + + static void operator delete(void *ptr, size_t size); + static void operator delete(void *, MEM_ROOT *){} +}; + + +int mysql_open_cursor(THD *thd, select_result *result, + Server_side_cursor **res); + +#endif /* _sql_cusor_h_ */ |