97 lines
3.2 KiB
C++
97 lines
3.2 KiB
C++
/* Copyright (c) 2018, 2021, Alibaba and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL/PolarDB-X Engine hereby grant you an
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additional permission to link the program and your derivative works with the
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separately licensed software that they have included with
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MySQL/PolarDB-X Engine.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SQL_DD_DD_MINOR_UPGRADE_H_INCLUDED
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#define SQL_DD_DD_MINOR_UPGRADE_H_INCLUDED
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/**
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Minor Upgrade is designed to upgrade I_S tables or System views by RDS.
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This strategy adds extra_I_S_version and extra_P_S_version into
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DD_properties table, we should increase these two version if modify I_S
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or P_S table struture.
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DD restart will construct I_S and P_S tables if versions are
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not consistent.
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This strategy didn't affect official upgrade.
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*/
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namespace dd {
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/**
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Version for plugin I_S tables.
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PLS increase it if update plugin I_S table structure.
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Attention:
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Need to update I_S plugin version calculation to take effect.
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*/
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static const uint EXTRA_IS_PLUGIN_VERSION = 0;
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/* The singleton instance to deal with minor upgrade */
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class Minor_upgrade_ctx {
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public:
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Minor_upgrade_ctx() {}
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~Minor_upgrade_ctx() {}
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// Get the singleton instance
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static Minor_upgrade_ctx *instance();
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// Get compiled extra I_S version
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static uint get_target_extra_I_S_version();
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// Get compiled extra P_S version
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static uint get_target_extra_P_S_version();
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// Get persisted extra I_S version
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virtual uint get_actual_extra_I_S_version(THD *thd);
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// Get persisted extra P_S version
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virtual uint get_actual_extra_P_S_version(THD *thd);
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// Persist extra I_S version into dd_properites
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uint set_extra_I_S_version(THD *thd, uint version);
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// Persist extra P_S version into dd_properites
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uint set_extra_P_S_version(THD *thd, uint version);
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// Get compiled extra mysqld_version_upgraded version
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static uint get_target_extra_mvu_version();
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// Set extra mysqld_version_upgraded variable
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void set_extra_mvu_version(uint version);
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// Get extra mysqld_version_upgraded variable
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uint get_extra_mvu_version();
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// Query the version and set variable
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void retrieve_and_set_extra_mvu_version(THD *thd);
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// Save the version and set variables
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bool save_and_set_extra_mvu_version(THD *thd, uint version);
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private:
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uint m_extra_mvu_version;
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};
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} // namespace dd
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#endif
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