table_constraints.cc

/* Copyright (c) 2017, 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.

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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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#include "sql/dd/impl/system_views/table_constraints.h"

#include <string>

#include "sql/stateless_allocator.h"

namespace dd {
namespace system_views {

const Table_constraints &Table_constraints::instance() {
  static Table_constraints *s_instance = new Table_constraints();
  return *s_instance;
}

Table_constraints::Table_constraints() {
  m_target_def.set_view_name(view_name());

  m_target_def.add_field(FIELD_CONSTRAINT_CATALOG, "CONSTRAINT_CATALOG",
                         "cat.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_CONSTRAINT_SCHEMA, "CONSTRAINT_SCHEMA",
                         "sch.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_CONSTRAINT_NAME, "CONSTRAINT_NAME",
                         "constraints.CONSTRAINT_NAME");
  m_target_def.add_field(FIELD_TABLE_SCHEMA, "TABLE_SCHEMA",
                         "sch.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_TABLE_NAME, "TABLE_NAME",
                         "tbl.name" + m_target_def.fs_name_collation());
  m_target_def.add_field(FIELD_CONSTRAINT_TYPE, "CONSTRAINT_TYPE",
                         "constraints.CONSTRAINT_TYPE");
  m_target_def.add_field(FIELD_ENFORCED, "ENFORCED", "constraints.ENFORCED");

  m_target_def.add_from("mysql.tables tbl");
  m_target_def.add_from("JOIN mysql.schemata sch ON tbl.schema_id=sch.id");
  m_target_def.add_from("JOIN mysql.catalogs cat ON cat.id = sch.catalog_id");
  m_target_def.add_from(
      ", LATERAL ( SELECT"
      "    idx.name AS CONSTRAINT_NAME,"
      "    IF (idx.type='PRIMARY', 'PRIMARY KEY', idx.type) as CONSTRAINT_TYPE,"
      "    'YES' as ENFORCED"
      "  FROM mysql.indexes idx"
      "    WHERE idx.table_id=tbl.id AND idx.type IN ('PRIMARY', 'UNIQUE')"
      "          AND IS_VISIBLE_DD_OBJECT(tbl.hidden, idx.hidden, idx.options)"
      " UNION ALL"
      "  SELECT"
      "    fk.name COLLATE utf8mb3_tolower_ci AS CONSTRAINT_NAME,"
      "    'FOREIGN KEY' as CONSTRAINT_TYPE,"
      "    'YES' as ENFORCED"
      "  FROM mysql.foreign_keys fk WHERE fk.table_id=tbl.id"
      " UNION ALL"
      "  SELECT"
      "    cc.name AS CONSTRAINT_NAME,"
      "    'CHECK' as CONSTRAINT_TYPE,"
      "    cc.enforced as ENFORCED"
      "  FROM mysql.check_constraints cc WHERE cc.table_id=tbl.id"
      ") constraints");
  m_target_def.add_where("CAN_ACCESS_TABLE(sch.name, tbl.name)");
  m_target_def.add_where("AND IS_VISIBLE_DD_OBJECT(tbl.hidden)");
}

}  // namespace system_views
}  // namespace dd