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plugin/info_schema/table_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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 *   table 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 "table_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 table 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 table 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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 * table constraints I_S table.
 
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 */
 
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static plugin::InfoSchemaTable *tc_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 *> *TableConstraintsIS::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("TABLE_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("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("CONSTRAINT_TYPE",
 
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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 *TableConstraintsIS::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 TabConstraintsISMethods();
 
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  }
 
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  if (tc_table == NULL)
 
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  {
 
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    tc_table= new plugin::InfoSchemaTable("TABLE_CONSTRAINTS",
 
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                                          *columns,
 
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                                          3, 4, false, true,
 
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                                          OPEN_TABLE_ONLY,
 
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                                          methods);
 
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  }
 
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  return tc_table;
 
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}
 
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/**
 
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 * Delete memory allocated for the table, columns and methods.
 
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 */
 
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void TableConstraintsIS::cleanup()
 
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{
 
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  clearColumns(*columns);
 
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  delete tc_table;
 
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  delete methods;
 
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  delete columns;
 
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}
 
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static bool store_constraints(Session *session, 
 
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                              Table *table, 
 
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                              LEX_STRING *db_name,
 
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                              LEX_STRING *table_name, 
 
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                              const char *key_name,
 
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                              uint32_t key_len, 
 
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                              const char *con_type, 
 
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                              uint32_t con_len)
 
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{
 
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  const CHARSET_INFO * const cs= system_charset_info;
 
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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[2]->store(key_name, key_len, cs);
 
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  table->field[3]->store(db_name->str, db_name->length, cs);
 
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  table->field[4]->store(table_name->str, table_name->length, cs);
 
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  table->field[5]->store(con_type, con_len, cs);
 
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  return schema_table_store_record(session, table);
 
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}
 
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int TabConstraintsISMethods::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) const
 
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{
 
182
  if (res)
 
183
  {
 
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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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  else
 
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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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    KEY *key_info=show_table->key_info;
 
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    uint32_t primary_key= show_table->s->primary_key;
 
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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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    for (uint32_t i= 0; i < show_table->s->keys; i++, key_info++)
 
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    {
 
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      if (i != primary_key && ! (key_info->flags & HA_NOSAME))
 
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      {
 
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        continue;
 
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      }
 
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      if (i == primary_key && is_primary_key(key_info))
 
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      {
 
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        if (store_constraints(session, 
 
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                              table, 
 
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                              db_name, 
 
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                              table_name, 
 
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                              key_info->name,
 
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                              strlen(key_info->name),
 
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                              STRING_WITH_LEN("PRIMARY KEY")))
 
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        {
 
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          return 1;
 
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        }
 
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      }
 
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      else if (key_info->flags & HA_NOSAME)
 
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      {
 
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        if (store_constraints(session, 
 
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                              table, 
 
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                              db_name, 
 
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                              table_name, 
 
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                              key_info->name,
 
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                              strlen(key_info->name),
 
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                              STRING_WITH_LEN("UNIQUE")))
 
232
        {
 
233
          return 1;
 
234
        }
 
235
      }
 
236
    }
 
237
 
 
238
    show_table->cursor->get_foreign_key_list(session, &f_key_list);
 
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    FOREIGN_KEY_INFO *f_key_info= NULL;
 
240
    List_iterator_fast<FOREIGN_KEY_INFO> it(f_key_list);
 
241
    while ((f_key_info= it++))
 
242
    {
 
243
      if (store_constraints(session, 
 
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                            table, 
 
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                            db_name, 
 
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                            table_name,
 
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                            f_key_info->forein_id->str,
 
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                            strlen(f_key_info->forein_id->str),
 
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                            "FOREIGN KEY", 11))
 
250
      {
 
251
        return 1;
 
252
      }
 
253
    }
 
254
  }
 
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  return res;
 
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}
 
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