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plugin/info_schema/referential_constraints.cc
 
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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 
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 *
 
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 *  Copyright (C) 2009 Sun Microsystems
 
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 *
 
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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 as published by
 
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 *  the Free Software Foundation; either version 2 of the License, or
 
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 *  (at your option) any later version.
 
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 *
 
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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 for more details.
 
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 *
 
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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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 */
 
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/**
 
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 * @file 
 
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 *   referential constraints I_S table methods.
 
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 */
 
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#include "drizzled/server_includes.h"
 
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#include "drizzled/session.h"
 
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#include "drizzled/show.h"
 
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#include "helper_methods.h"
 
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#include "referential_constraints.h"
 
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#include <vector>
 
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using namespace drizzled;
 
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using namespace std;
 
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/*
 
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 * Vectors of columns for the referential constraints I_S table.
 
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 */
 
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static vector<const plugin::ColumnInfo *> *columns= NULL;
 
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/*
 
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 * Methods for the referential constraints I_S table.
 
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 */
 
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static plugin::InfoSchemaMethods *methods= NULL;
 
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/*
 
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 * processlist I_S table.
 
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 */
 
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static plugin::InfoSchemaTable *rc_table= NULL;
 
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/**
 
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 * Populate the vectors of columns for the I_S table.
 
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 *
 
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 * @return a pointer to a std::vector of Columns.
 
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 */
 
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vector<const plugin::ColumnInfo *> *ReferentialConstraintsIS::createColumns()
 
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{
 
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  if (columns == NULL)
 
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  {
 
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    columns= new vector<const plugin::ColumnInfo *>;
 
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  }
 
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  else
 
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  {
 
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    clearColumns(*columns);
 
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  }
 
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  columns->push_back(new plugin::ColumnInfo("CONSTRAINT_CATALOG",
 
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                                            FN_REFLEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            1,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("CONSTRAINT_SCHEMA",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("CONSTRAINT_NAME",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("UNIQUE_CONSTRAINT_CATALOG",
 
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                                            FN_REFLEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            1,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("UNIQUE_CONSTRAINT_SCHEMA",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("UNIQUE_CONSTRAINT_NAME",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            MY_I_S_MAYBE_NULL,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("MATCH_OPTION",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("UPDATE_RULE",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("DELETE_RULE",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("TABLE_NAME",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  columns->push_back(new plugin::ColumnInfo("REFERENCED_TABLE_NAME",
 
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                                            NAME_CHAR_LEN,
 
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                                            DRIZZLE_TYPE_VARCHAR,
 
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                                            0,
 
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                                            0,
 
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                                            "",
 
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                                            OPEN_FULL_TABLE));
 
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  return columns;
 
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}
 
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/**
 
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 * Initialize the I_S table.
 
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 *
 
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 * @return a pointer to an I_S table
 
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 */
 
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plugin::InfoSchemaTable *ReferentialConstraintsIS::getTable()
 
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{
 
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  columns= createColumns();
 
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  if (methods == NULL)
 
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  {
 
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    methods= new RefConstraintsISMethods();
 
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  }
 
173
 
 
174
  if (rc_table == NULL)
 
175
  {
 
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    rc_table= new plugin::InfoSchemaTable("REFERENTIAL_CONSTRAINTS",
 
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                                          *columns,
 
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                                          1, 9, false, true,
 
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                                          OPEN_TABLE_ONLY,
 
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                                          methods);
 
181
  }
 
182
 
 
183
  return rc_table;
 
184
}
 
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/**
 
187
 * Delete memory allocated for the table, columns and methods.
 
188
 */
 
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void ReferentialConstraintsIS::cleanup()
 
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{
 
191
  clearColumns(*columns);
 
192
  delete rc_table;
 
193
  delete methods;
 
194
  delete columns;
 
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}
 
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int
 
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RefConstraintsISMethods::processTable(Session *session, 
 
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                                      TableList *tables,
 
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                                      Table *table, 
 
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                                      bool res,
 
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                                      LEX_STRING *db_name, 
 
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                                      LEX_STRING *table_name)
 
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  const
 
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{
 
206
  const CHARSET_INFO * const cs= system_charset_info;
 
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208
  if (res)
 
209
  {
 
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    if (session->is_error())
 
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    {
 
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      push_warning(session, 
 
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                   DRIZZLE_ERROR::WARN_LEVEL_WARN,
 
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                   session->main_da.sql_errno(), 
 
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                   session->main_da.message());
 
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    }
 
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    session->clear_error();
 
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    return 0;
 
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  }
 
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  {
 
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    List<FOREIGN_KEY_INFO> f_key_list;
 
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    Table *show_table= tables->table;
 
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    show_table->cursor->info(HA_STATUS_VARIABLE |
 
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                             HA_STATUS_NO_LOCK |
 
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                             HA_STATUS_TIME);
 
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    show_table->cursor->get_foreign_key_list(session, &f_key_list);
 
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    FOREIGN_KEY_INFO *f_key_info;
 
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    List_iterator_fast<FOREIGN_KEY_INFO> it(f_key_list);
 
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    while ((f_key_info= it++))
 
232
    {
 
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      table->restoreRecordAsDefault();
 
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      table->field[1]->store(db_name->str, db_name->length, cs);
 
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      table->field[9]->store(table_name->str, table_name->length, cs);
 
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      table->field[2]->store(f_key_info->forein_id->str,
 
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                             f_key_info->forein_id->length, cs);
 
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      table->field[4]->store(f_key_info->referenced_db->str,
 
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                             f_key_info->referenced_db->length, cs);
 
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      table->field[10]->store(f_key_info->referenced_table->str,
 
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                              f_key_info->referenced_table->length, cs);
 
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      if (f_key_info->referenced_key_name)
 
243
      {
 
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        table->field[5]->store(f_key_info->referenced_key_name->str,
 
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                               f_key_info->referenced_key_name->length, cs);
 
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        table->field[5]->set_notnull();
 
247
      }
 
248
      else
 
249
      {
 
250
        table->field[5]->set_null();
 
251
      }
 
252
      table->field[6]->store(STRING_WITH_LEN("NONE"), cs);
 
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      table->field[7]->store(f_key_info->update_method->str,
 
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                             f_key_info->update_method->length, cs);
 
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      table->field[8]->store(f_key_info->delete_method->str,
 
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                             f_key_info->delete_method->length, cs);
 
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      if (schema_table_store_record(session, table))
 
258
      {
 
259
        return 1;
 
260
      }
 
261
    }
 
262
  }
 
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  return 0;
 
264
}
 
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