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#ifndef DD_SQL_VIEW_INCLUDED
#define DD_SQL_VIEW_INCLUDED
/* Copyright (c) 2016, 2025, Oracle and/or its affiliates.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is designed to work with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have either included with
the program or referenced in the documentation.
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, version 2.0, 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 02110-1301 USA */
#include "mysql/components/services/bits/psi_bits.h"
#include "prealloced_array.h"
class THD;
class sp_name;
class Table_ref;
/**
Guard class which allows to invalidate TDC entries for specific tables/views.
We use it to get rid of TABLE_SHARE objects corresponding to tables/views
which definitions are not committed yet (and possibly won't be!).
*/
class Uncommitted_tables_guard {
public:
Uncommitted_tables_guard(THD *thd)
: m_thd(thd), m_uncommitted_tables(PSI_INSTRUMENT_ME) {}
~Uncommitted_tables_guard();
void add_table(Table_ref *table) { m_uncommitted_tables.push_back(table); }
private:
THD *m_thd;
Prealloced_array<Table_ref *, 1> m_uncommitted_tables;
};
/**
Update metadata of views referencing the table.
@param thd Thread handle.
@param db_name Database name.
@param table_name Update metadata of views referencing
this table.
@param commit_dd_changes Indicates whether changes to DD need
to be committed.
@param[in,out] uncommitted_tables Helper class to store list of views
which shares need to be removed from
TDC if we fail to commit changes to
DD. Only used if commit_dd_changes
is false.
@note In case when commit_dd_changes is false, the caller must rollback
both statement and transaction on failure, before any further
accesses to DD. This is because such a failure might be caused by
a deadlock, which requires rollback before any other operations on
SE (including reads using attachable transactions) can be done.
If case when commit_dd_changes is true this function will handle
transaction rollback itself.
@retval false Success.
@retval true Failure.
*/
bool update_referencing_views_metadata(
THD *thd, const char *db_name, const char *table_name,
bool commit_dd_changes, Uncommitted_tables_guard *uncommitted_tables);
/**
Update metadata of views referencing the table.
@param thd Thread handle.
@param table Update metadata of views referencing
this table.
@param commit_dd_changes Indicates whether changes to DD need
to be committed.
@param[in,out] uncommitted_tables Helper class to store list of views
which shares need to be removed from
TDC if we fail to commit changes to
DD. Only used if commit_dd_changes
is false.
@note In case when commit_dd_changes is false, the caller must rollback
both statement and transaction on failure, before any further
accesses to DD. This is because such a failure might be caused by
a deadlock, which requires rollback before any other operations on
SE (including reads using attachable transactions) can be done.
If case when commit_dd_changes is true this function will handle
transaction rollback itself.
@retval false Success.
@retval true Failure.
*/
bool update_referencing_views_metadata(
THD *thd, const Table_ref *table, bool commit_dd_changes,
Uncommitted_tables_guard *uncommitted_tables);
/**
Update metadata of views referencing "table" being renamed and views
referencing (if there any) new table name "new_db.new_table_name".
@param thd Thread handle.
@param table Update metadata of views referencing this
table.
@param new_db New db name set in the rename operation.
@param new_table_name New table name set in the rename
@param commit_dd_changes Indicates whether changes to DD need
to be committed.
@param[in,out] uncommitted_tables Helper class to store list of views
which shares need to be removed from
TDC if we fail to commit changes to
DD. Only used if commit_dd_changes
is false.
@note In case when commit_dd_changes is false, the caller must rollback
both statement and transaction on failure, before any further
accesses to DD. This is because such a failure might be caused by
a deadlock, which requires rollback before any other operations on
SE (including reads using attachable transactions) can be done.
If case when commit_dd_changes is true this function will handle
transaction rollback itself.
operation.
@retval false Success.
@retval true Failure.
*/
bool update_referencing_views_metadata(
THD *thd, const Table_ref *table, const char *new_db,
const char *new_table_name, bool commit_dd_changes,
Uncommitted_tables_guard *uncommitted_tables);
/**
Method to update metadata of views using stored function.
@param thd Thread handle.
@param spname Name of the stored function.
@retval false Success.
@retval true Failure.
*/
bool update_referencing_views_metadata(THD *thd, const sp_name *spname);
/**
Mark views referencing the table as invalid.
@param thd Thread handle.
@param table Views referencing this table need
to be marked as invalid.
@param skip_same_db Indicates whether it is OK to skip
views belonging to the same database
as table (as they will be dropped
anyway).
@param commit_dd_changes Indicates whether changes to DD need
to be committed.
@param mem_root Memory root for allocation of temporary
objects which will be cleared after
each call to this function.
@note In case when commit_dd_changes is false, the caller must rollback
both statement and transaction on failure, before any further
accesses to DD. This is because such a failure might be caused by
a deadlock, which requires rollback before any other operations on
SE (including reads using attachable transactions) can be done.
If case when commit_dd_changes is true this function will handle
transaction rollback itself.
@note This call is a version of update_referencing_views_metadata(),
which is optimized for DROP DATABASE case.
@retval false Success.
@retval true Failure.
*/
bool mark_referencing_views_invalid(THD *thd, const Table_ref *table,
bool skip_same_db, bool commit_dd_changes,
MEM_ROOT *mem_root);
/**
Mark views using stored function as invalid.
@param thd Thread handle.
@param spname Name of the stored function.
@param mem_root Memory root for allocation of temporary objects
which will be cleared after each call to this
function.
@note This call is a version of update_referencing_views_metadata(),
which is optimized for DROP DATABASE case.
@retval false Success.
@retval true Failure.
*/
bool mark_referencing_views_invalid(THD *thd, const sp_name *spname,
MEM_ROOT *mem_root);
/**
Push error or warnings in case a view is invalid and return
the error message to the caller.
@param thd Thread handle.
@param db Database name.
@param view_name View name.
returns The error/warning message string.
*/
std::string push_view_warning_or_error(THD *thd, const char *db,
const char *view_name);
#endif // DD_SQL_VIEW_INCLUDED
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